W311

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Document overview

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Technical content

Features

• Maximized EMI Suppression using Cypress’s Spread Spectrum Technology
• System frequency synthesizer for VIA Pro-2000
• Programmable clock output frequency with less than 1 MHz increment
• Integrated fail-safe Watchdog Timer for system recovery
• Automatically switch to HW selected or SW programmed clock frequency when Watchdog Timer time-out
• Capable of generate system RESET after a Watchdog Timer time-out occurs or a change in output frequency via SMBus interface
• Support SMBus byte read/write and block read/ write operations to simplify system BIOS development
• Vendor ID and Revision ID support
• Programmable drive strength for CPU and PCI output clocks
• Programmable output skew between CPU, AGP and PCI
• Supports Intel ® Celeron® and Pentium® III class processor
• Three copies of CPU output
• Nine copies of PCI output
• One 48 MHz output for USB
• One 24 MHz or 48 MHz output for SIO
• Two buffered reference outputs
• Three copies of APIC output
• Supports frequencies up to 200MHz
• SMBus Interface for programming
• Power management control inputs
• Available in 48-pin SSOP Key Specifications Note: 1. Signals marked with * have internal pull-up resistors [1] Block Diagram Pin Configuration

Pin Name Pin No. Pin Type Pin Description RST# CPU1:3 39, 38, 35 O (open drain) O System Reset Output: Open-drain system reset output. CPU Clock Output: Frequency is set by the FS0:4 input or through serial input interface. The CPU1:3 outputs are gated by the CLK_STOP# input. CPU_STOP# 34 I CPU Output Control: 3.3V LVTTL-compatible input that stop CPU1:3. PCI1:8 10, 11, 13, 14, 16, 17, 18, 20 O PCI Clock Outputs 1 through 8: Frequency is set by FS0:4 inputs or through serial input interface; see Table 5 for details. PCI1:8 outputs are gated by the PCI_STOP# input. PCI_STOP# 33 O PCI_STOP# Input: 3.3V LVTTL-compatible input that stops PCI1:8. PCI_F 9 O Free-Running PCI Clock Output: Frequency is set by FS0:4 inputs or through serial input interface; see Table 5 for details. FS0:1 AGP0:2 21, 22 23, 26, 27 I O Frequency Selection Inputs: Selects CPU clock frequency as shown in Table 1. AGP Clock Output: This pin serves as the select strap to determine device operating frequency as described in Table 5. APIC0:2 48MHz/FS3 45, 44, 42 O I/O APIC Clock Output: APIC clock outputs. 48 MHz Output/Frequency Select 3: 48 MHz is provided in normal operation. In standard PC systems, this output can be used as the reference for the Universal Serial Bus host controller. This pin also serves as a power-on strap option to determine device operating frequency as described in Table 5. 24_48MHz/ FS2 REF1/FS4 I/O I/O 24_48 MHz Output/Frequency Select 2: In standard PC systems, this output can be used as the clock input for a Super I/O chip. The output frequency is controlled by Configuration Byte 3 bit[6]. The default output frequency is 24 MHz. This pin also serves as a power-on strap option to determine device operating frequency as described in Table 5. Reference Clock Output 1/Frequency Select 4: 3.3V 14.318 MHz output clock. This pin also serves as a power-on strap option to determine device operating frequency as described in Table 5. REF0 48 O Reference Clock Output 0: 3.3V 14.318 MHz output clock. SCLK 28 I Clock pin for SMBus circuitry. SDATA 29 I/O Data pin for SMBus circuitry. X1 3 I Crystal Connection or External Reference Frequency Input: This pin has dual functions. It can be used as an external 14.318 MHz crystal connection or as an external reference frequency input. X2 41 I Crystal Connection: An input connection for an external 14.318 MHz crystal. If using an external reference, this pin must be left unconnected. VDD_REF, VDD_48MHz, VDD_PCI, VDD_AGP, VDD_CORE 1, 5,15, 24, 31 P Power Connection: Power supply for core logic, PLL circuitry, PCI outputs, reference outputs, 48 MHz output, and 24-48 MHz output, connect to 3.3V supply. VDD_CPU, VDD_APIC 41, 46, 37 P Power Connection: Power supply for APIC and CPU output buffers, connect to 2.5V.

particular device functions. indexed byte is encoded in the command code. The definition for the command code is defined in Table 2. need to be set at ‘0000000’. Table 2. Block Read and Block Write Protocol

10 Acknowledge from slave 10 Acknowledge from slave

19 Acknowledge from slave 19 Acknowledge from slave

28 Acknowledge from slave 21:27 Slave address – 7 bits

37 Acknowledge from slave 29 Acknowledge from slave

46 Acknowledge from slave 38 Acknowledge

Table 3. Word Read and Word Write Protocol

38 Stop 30:37 Data byte low from slave – 8 bits

38 Acknowledge

47 NOT acknowledge

48 Stop

Table 4. Byte Read and Byte Write Protocol

29 Stop 28 Read

29 Acknowledge from slave

38 Not Acknowledge

39 Stop

W311 Serial Configuration Map 1. The serial bits will be read by the clock driver in the following order: Byte 0 - Bits 7, 6, 5, 4, 3, 2, 1, 0 Byte 1 - Bits 7, 6, 5, 4, 3, 2, 1, 0 Byte N - Bits 7, 6, 5, 4, 3, 2, 1, 0 2. All unused register bits (reserved and N/A) should be written to a “0” level. 3. All register bits labeled “Initialize to 0" must be written to zero during initialization. Byte 0: Control Register 0 Bit Pin# Name Default Description Bit 7 – Reserved 0 Reserved Bit 6 – SEL2 0 See Table 5 Bit 5 – SEL1 0 See Table 5 Bit 4 – SEL0 0 See Table 5 Bit 3 – FS_Override 0 0 = Select operating frequency by FS[4:0] input pins 1 = Select operating frequency by SEL[4:0] settings Bit 2 – SEL4 1 See Table 5 Bit 1 – SEL3 0 See Table 5 Bit 0 – Reserved 0 Reserved Byte 1: Control Register 1 Bit Pin# Name Default Description Bit 7 - Reserved 0 Reserved Bit 6 - Spread Select2 0 ‘000’ = Normal (spread off) ‘001’ = Test Mode ‘010’ = Reserved ‘011’ = Three-Stated ‘100’ = –0.5% ‘101’ = ± 0.5% ‘110’ = ± 0.25% ‘111’ = ± 0.38% Bit 5 - Spread Select1 0 Bit 4 - Spread Select0 0 Bit 3 35 CPU3 1 (Active/Inactive) Bit 2 38 CPU2 1 (Active/Inactive) Bit 1 39 CPU1 1 (Active/Inactive) Bit 0 42 APIC2 1 (Active/Inactive) Byte 2: Control Register 2 Bit Pin# Name Default Description Bit 7 20 PC8 1 (Active/Inactive) Bit 6 18 PCI7 1 (Active/Inactive) Bit 5 17 PCI6 1 (Active/Inactive) Bit 4 16 PCI5 1 (Active/Inactive) Bit 3 14 PCI4 1 (Active/Inactive) Bit 2 13 PCI3 1 (Active/Inactive) Bit 1 11 PCI2 1 (Active/Inactive) Bit 0 10 PCI1 1 (Active/Inactive)

Byte 3: Control Register Bit Pin# Name Default Description Bit 7 -- Reserved 0 Reserved Bit 6 7 SEL_48MHz 0 0 = Select 24 MHz as output 1 = Select 48 MHz as output (default). Bit 5 6 48MHz 1 (Active/Inactive) Bit 4 7 24_48MHz 1 (Active/Inactive) Bit 3 9 PCI_F 1 (Active/Inactive) Bit 2 27 AGP2 1 (Active/Inactive) Bit 1 26 AGP1 1 (Active/Inactive) Bit 0 23 AGP0 1 (Active/Inactive) Byte 4: Watchdog Timer Register Bit Pin# Name Default Description Bit 7 - PCI_Skew1 0 PCI skew control 00 = Normal 01 = –500 ps 10 = Reserved 11 = +500 ps Bit 6 - PCI_Skew0 0 These bits store the time-out value of the Watchdog Timer. The scale of the timer is determine by the pre scaler. The timer can support a value of 150 ms to 4.8 sec when the pre-scalar is set to 150 ms. If the pre-scaler is set to 2.5 sec, it can support a value from 2.5 sec to 80 sec. When the Watchdog Timer reaches to “0”, it will set the WD_To_STATUS bit and generate Reset if RST_EN_WD is enabled Bit 5 Bit 4 - WD_TIMER4 1 Bit 3 - WD_TIMER3 1 Bit 2 - WD_TIMER2 1 Bit 1 - WD_TIMER1 1 Bit 0 - WD_TIMER0 1 0 = 150 ms 1 = 2.5 sec Byte 5: Control Register 5 Bit Pin# Name Default Description Bit 7 6 48Mhz_DRV 1 0 = Norm, 1 = High Drive Bit 6 7 24_48MHz_DRV 1 0 = Norm, 1 = High Drive Bit 5 44 APIC1 1 (Active/Inactive) Bit 4 45 APIC0 1 (Active/Inactive) Bit 3 - Reserved 0 Reserved Bit 2 - Reserved 0 Reserved Bit 1 47 REF1 1 (Active/Inactive) Bit 0 48 REF0 1 (Active/Inactive)

Byte 6: Reserved Register Bit Name Default Pin Description Bit 7 Reserved 1 Reserved Bit 6 Reserved 1 Reserved Bit 5 Reserved 1 Reserved Bit 4 Reserved 1 Reserved Bit 3 Reserved 1 Reserved Bit 2 Reserved 1 Reserved Bit 1 Reserved 1 Reserved Bit 0 Reserved 1 Reserved Byte 7: Reserved Register Bit Name Default Pin Description Bit 7 Reserved 1 Reserved Bit 6 Reserved 1 Reserved Bit 5 Reserved 1 Reserved Bit 4 Reserved 1 Reserved Bit 3 Reserved 1 Reserved Bit 2 Reserved 1 Reserved Bit 1 Reserved 1 Reserved Bit 0 Reserved 1 Reserved Byte 8: Vendor ID and Revision ID Register (Read Only) Bit Name Default Pin Description Bit 7 Revision_ID3 0 Revision ID bit[3] Bit 6 Revision_ID2 0 Revision ID bit[2] Bit 5 Revision_ID1 0 Revision ID bit[1] Bit 4 Revision_ID0 0 Revision ID bit[0] Bit 3 Vendor_ID3 1 Bit[3] of Cypress Semicondu ctor’s Vendor ID. This bit is read only. Bit 2 Vendor_ID2 0 Bit[2] of Cypress Semicondu ctor’s Vendor ID. This bit is read only. Bit 1 Vendor _ID1 0 Bit[1] of Cypress Semiconductor’s Vendor ID. This bit is read only. Bit 0 Vendor _ID0 0 Bit[0] of Cypress Semiconductor’s Vendor ID. This bit is read only.

Byte 9: System Reset and Watchdog Timer Register Bit Name Default Pin Description Bit 7 Reserved 0 Reserved Bit 6 PCI_DRV 0 PCI clock output drive strength 0 = Normal 1 = High Drive Bit 5 Reserved 0 Reserved Bit 4 RST_EN_WD 0 This bit will enable the generat ion of a Reset pulse when a watchdog timer time-out occurs. 0 = Disabled 1 = Enabled Bit 3 RST_EN_FC 0 This bit will enable the generation of a Reset pulse after a frequency change occurs. 0 = Disabled 1 = Enabled Bit 2 WD_TO_STATU S

0 Watchdog Timer Time -out Status bit

0 = No time-out occurs (READ); Ignore (WRITE) 1 = time-out occurred (READ); Clear WD_TO_STATUS (WRITE) Bit 1 WD_EN 0 0 = Stop and re-load Watchdog Timer 1 = Enable Watchdog Timer. It will start counting down after a frequency change occurs. Note: W311 will generate system reset, reload a recovery frequency, and lock itself into a recovery frequency mode after a watchdog timer time-out occurs. Under recovery frequency mode, W311 will not respond to any attempt to change output frequency via the SMBus control bytes. System software can unlock W311 from its recovery frequency mode by clearing the WD_EN bit. Bit 0 Reserved 0 Reserved Byte 10: Skew Control Register Bit Name Default Description Bit 7 CPU_Skew2 0 CPU skew control 000 = Normal 001 = –150 ps 010 = –300 ps 011 = –450 ps 100 = +150 ps 101 = +300 ps 110 = +450 ps 111 = +600 ps Bit 6 CPU_Skew1 0 Bit 5 CPU_Skew0 0 Bit 4 Reserved 0 Reserved Bit 3 Reserved 0 Reserved Bit 2 Reserved 0 Reserved Bit 1 AGP_Skew1 0 AGP skew control 00 = Normal 01 = –150 ps 10 = +150 ps 11 = +300 ps Bit 0 AGP_Skew0 0

Byte 11: Recovery Frequency N - Value Register Bit Name Default Description Bit 7 ROCV_FREQ_N7 0 If ROCV_FREQ_ SEL is set, W311 will use the values programmed in ROCV_- FREQ_N[7:0] and ROCV_FREQ_M[6:0] to determine the recovery CPU output frequency.when a Watchdog Timer time-out occurs. The setting of FS_Override bit determines the frequency ratio for CPU, SDRAM, AGP and SDRAM. When it is cleared, W311 will use the same frequency ratio stated in the Latched FS[4:0] register. When it is set, W311 will use the frequency ratio stated in the SEL[4:0] register. W312 supports programmable CPU frequency ranging from 50 MHz to 248 MHz. W311 will change the output frequency whenever there is an update to either ROCV_FREQ_N[7:0] and ROCV_FREQ_M[6:0]. Therefore, it is recommended to use Word or Block write to update both registers within the same SMBus bus operation. Bit 6 ROCV_FREQ_N6 0 Bit 5 ROCV_FREQ_N5 0 Bit 4 ROCV_FREQ_N4 0 Bit 3 ROCV_FREQ_N3 0 Bit 2 ROCV_FREQ_N2 0 Bit 1 ROCV_FREQ_N1 0 Bit 0 ROCV_FREQ_N0 0 Byte 12: Recovery Frequency M- Value Register Bit Name Default Pin Description Bit 7 ROCV_FREQ_SEL 0 ROCV_FREQ_SEL determines the source of the recover frequency when a Watchdog Timer time-out occurs. The clock generator will automatically switch to the recovery CPU frequency based on the selection on ROCV_FRE- Q_SEL. 0 = From latched FS[4:0] 1 = From the settings of ROCV_FREQ_N[7:0] & ROCV_FREQ_M[6:0] Bit 6 ROCV_FREQ_M6 0 If ROCV_FRE Q_SEL is set, W311 will use the values programmed in ROCV_- FREQ_N[7:0] and ROCV_FREQ_M[6:0] to determine the recovery CPU output frequency.when a Watchdog Timer time-out occurs.The setting of FS_Override bit determines the frequency ratio for CPU, SDRAM, AGP and SDRAM. When it is cleared, W311 will use the same frequency ratio stated in the Latched FS[4:0] register. When it is set, W311 will use the frequency ratio stated in the SEL[4:0] register. W311 supports programmable CPU frequency ranging from 50 MHz to 248 MHz. Bit 5 ROCV_FREQ_M5 0 Bit 4 ROCV_FREQ_M4 0 Bit 3 ROCV_FREQ_M3 0 Bit 2 ROCV_FREQ_M2 0 Bit 1 ROCV_FREQ_M1 0 Bit 0 ROCV_FREQ_M0 0 Byte 13: Programmable Frequency Select N-Value Register Bit Name Default Pin Description Bit 7 CPU_FSEL_N7 0 If Prog_Freq_EN is set, W311 will use the values programmed in CPU_F- SEL_N[7:0] and CPU_FSEL_M[6:0] to determine the CPU output frequency. The new frequency will start to load whenever CPU_FSELM[6:0] is updated. The setting of FS_Override bit determines the frequency ratio for CPU, SDRAM, AGP and SDRAM. When it is cleared, W311 will use the same frequency ratio stated in the Latched FS[4:0] register. When it is set, W311 will use the frequency ratio stated in the SEL[4:0] register. W311 supports programmable CPU frequency ranging from 50 MHz to 248 MHz. Bit 6 CPU_FSEL_N6 0 Bit 5 CPU_FSEL_N5 0 Bit 4 CPU_FSEL_N4 0 Bit 3 CPU_FSEL_N3 0 Bit 2 CPU_FSEL_N2 0 Bit 1 CPU_FSEL_N1 0 Bit 0 CPU_FSEL_N0 0

Byte 14: Programmable Frequency Select N-Value Register Bit Name Default Description Bit 7 Pro_Freq_EN 0 Programmable output frequencies enabled 0 = disabled 1 = enabled Bit 6 CPU_FSEL_M6 0 If Prog_Freq_EN is set, W3 11 will use the values programmed in CPU_F- SEL_N[7:0] and CPU_FSEL_M[6:0] to determine the CPU output frequency. The new frequency will start to load whenever CPU_FSELM[6:0] is updated. The setting of FS_Override bit determines the frequency ratio for CPU, SDRAM, AGP and SDRAM. When it is cleared, W311 will use the same frequency ratio stated in the Latched FS[4:0] register. When it is set, W311 will use the frequency ratio stated in the SEL[4:0] register. Bit 5 CPU_FSEL_M5 0 Bit 4 CPU_FSEL_M4 0 Bit 3 CPU_FSEL_M3 0 Bit 2 CPU_FSEL_M2 0 Bit 1 CPU_FSEL_M1 0 Bit 0 CPU_FSEL_M0 0 Byte 15: Reserved Register Bit Pin# Name Default Description Bit 7 47 Latched FS4 input X Latched FS[4:0] inputs. These bits are read only. Bit 6 6 Latched FS3 input X Bit 5 7 Latched FS2 input X Bit 4 21 Latched FS1 input X Bit 3 22 Latched FS0 input X Bit 2 - Vendor test mode 0 Reserved. Write with ‘0’ Bit 1 - Vendor test mode 1 Reserved. Write with ‘1’ Bit 0 - Vendor test mode 1 Reserved. Write with ‘1’ Byte 16: Reserved Register Bit Pin# Name Default Description Bit 7 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 6 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 5 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 4 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 3 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 2 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 1 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 0 - Vendor test mode 0 Reserved. Write with ‘0’. Byte 17: Reserved Register Bit Pin# Name Default Description Bit 7 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 6 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 5 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 4 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 3 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 2 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 1 - Vendor test mode 0 Reserved. Write with ‘0’. Bit 0 - Vendor test mode 0 Reserved. Write with ‘0’.

generated and a recovery frequency will be activated. All of the related registers are summarized inTable 7. Table 5. Additional Frequency Selections through Serial Data Interface Data Bytes

Table 6. Register Summary will be used. If FS_Override bit is set, programmed value of SEL[4:0] will be used. CPU and other frequency outputs. Word or Block write to update both registers within the same SMBus bus operation. FS_Override is cleared or disabled, the frequency ratio follows the latched value of the FS input pins. the same frequency ratio stated in the Latched FS[4:0] register will be used. When it is set, the frequency ratio stated in the SEL[4:0] register will be used. within the same SMBus bus operation. 1 = Enable Watchdog Timer. It will start counting down after a frequency change occurs. will be used. If FS_Override bit is set, programmed value of SEL[4:0] will be used. CPU and other frequency outputs.

value of the N-Value Register. Word or Block write to update both registers within the same SMBus bus operation. FS_Override is cleared or disabled, the frequency ratio follows the latched value of the FS input pins. RST_EN_WD This bit will enable the generation of a Reset pulse when a Watchdog timer time-out occurs. RST_EN_FC This bit will enable the generation of a Reset pulse after a frequency change occurs. Table 6. Register Summary (continued) Table 7. Examples of N and M Value for Different CPU Frequency Range

Absolute Maximum Ratings[2] Stresses greater than those listed in this table may cause permanent damage to the devic e. These represent a stress rating only. Operation of the device at these or any other condi- tions above those specified in the operating sections of this specification is not implied. Maximum conditions for extended periods may affect reliability. Parameter Descrip tion Rating Unit VDD, VIN Voltage on any pin with respect to GND –0.5 to +7.0 V TSTG Storage Temperature –65 to +150 °C TB Ambient Temperature under Bias –55 to +125 °C TA Operating Temperature 0 to +70 °C ESDPROT Input ESD Protection 2 (min.) kV Parameter Description Test Condition Min. Typ. Max. Unit Supply Current IDD 3.3V Supply Current CPU [1:3]=133 MHz [3] –2 6 0– m A IDD 2.5V Supply Current – 25 – mA Logic Inputs VIL Input Low Voltage GND – 0.3 – 0.8 V VIH Input High Voltage 2.0 – V DD + 0.3 V IIL Input Low Current[4] –– – 2 5 µ A IIH Input High Current[4] – – 10 µA Clock Outputs VOL Output Low Voltage I OL = 1 mA – – 50 mV VOH Output High Voltage I OH = –1 mA 3.1 – – V VOH Output Low Voltage CPUT[1:3] APIC[0:2] IOH = –1 mA 2.2 – – V IOL Output Low Current CPU1:3 V OL = 1.25V 27 57 97 mA PCI_F, PCI1:8 V OL = 1.5V 20.5 53 139 mA AGP0:2 V OL = 1.25V 40 85 140 mA APIC0:2 V OL = 1.25V 40 85 140 mA REF0:1 V OL = 1.5V 25 37 76 mA 48-MHz V OL = 1.5V 25 37 76 mA 24-MHz V OL = 1.5V 25 37 76 mA IOH Output High Current CPU1:3 V OH = 1.25V 25 55 97 mA PCI_F, PCI1:8 V OH = 1.5V 31 55 139 mA AGP0:2 V OL = 1.25V 40 85 140 mA APIC0:1 V OH = 1.5V 27 44 94 mA 48-MHz V OH = 1.5V 27 44 94 mA 24-MHz V OH = 1.5V 25 37 76 mA Notes: 2. Multiple Supplies: The voltage on any input or I/O pin cannot exceed the power pin during power-up. Power supply sequencing i s NOT required. 3. All clock outputs loaded with 6" 60  transmission lines with 22-pF capacitors. 4. Inputs have internal pull-up resistors

TA = 0°C to +70°C, VDD = 3.3V±5%, VDD = 2.5V±5%fXTL = 14.31818 MHz AC clock parameters are tested and guarant eed over stated operating conditions using the stated lump capacitive load at the clock output; Spread Spectrum is disabled. Notes: 5. X1 input threshold voltage (typical) is 3.3V/2 6. The W311 contains an internal crystal load capacitor between pin X1 and ground and another between pin X2 and ground. Total load placed on crystal is 18 pF; this includes typical stray capacitance of short PCB traces to crystal. 7. X1 input capac itance is applicable when driving X1 with an external clock source (X2 is left unconnected). Crystal Oscillator VTH X1 Input Threshold Voltage[5] VDD = 3.3V – 1.65 – V CLOAD Load Capacitance, Imposed on External Crystal[6] –1 8–p F CIN,X1 X1 Input Capacitance[7] Pin X2 unconnected – 28 – pF Pin Capacitance/Inductance CIN Input Pin Capacitance Except X1 and X2 – – 5 pF COUT Output Pin Capacitance – – 6 pF LIN Input Pin Inductance – – 7 nH Parameter Description Test Condition Min. Typ. Max. Unit CPU Clock Outputs (Lump Capacitance Test Load = 20 pF) Parameter Description Test Condition /Comments CPU = 66.6 MHz CPU = 100 MHz CPU = 133 MHz tP Period Measured on rising edge at 1.25 15 – 15.5 10 – 10.5 7.5 – 8.0 ns tH High Time Duration of clock cycle above 2.0V tL Low Time Duration of clock cycle below 0.4V tR Output Rise Edge Rate Measured from 0.4V to 2.0V 1–4 1–41–4 V / n s tF Output Fall Edge Rate Measured from 2.0V to 0.4V 1–4 1–41–4 V / n s tD Duty Cycle Measured on rising and falling edge at 1.25V 45 – 55 45 – 55 45 – 55 % tJC Jitter, Cycle-to-Cycle Measured on rising edge at 1.25V. Maximum difference of cycle time between two adjacent cycles. t SK Output Skew Measured on rising edge at 1.25V fST Frequency Stabilization from Power-up (cold start) Assumes full supply voltage reached within 1 ms from power-up. Short cycles exist prior to frequency stabilization. Z o AC Output Impedance Average value during switching transition. Used for determining series termination value.

PCI Clock Outputs (Lump Capacitance Test Load = 30 pF) Parameter Description Test Condition/Comments Min. Typ. Max. Unit tP Period Measured on rising edge at 1.5V 30 – – ns tH High Time Duration of clo ck cycle above 2.4V 12 – – ns tL Low Time Duration of clo ck cycle below 0.4V 12 – – ns tR Output Rise Edge Rate Measured from 0.4V to 2.4V 1 – 4 V/ns tF Output Fall Edge Rate Measured from 2.4V to 0.4V 1 – 4 V/ns tD Duty Cycle Measured on rising and falling edge at 1.5V 45 – 55 % tJC Jitter, Cycle-to-Cycle Measured on rising edge at 1.5V. Maximum difference of cycle time between two adjacent cycles. –– 5 0 0 p s tSK Output Skew Measured on rising edge at 1.5V – – 500 ps tO CPU to PCI Clock Skew Covers all CPU/PCI outputs. Measured on rising edge at 1.5V. CPU leads PCI output. 1.5 – 4 ns fST Frequency Stabilization from Power-up (cold start) Assumes full supply voltage reached within 1 ms from power-up. Short cycles exist prior to frequency stabilization. ––3 m s Zo AC Output Impedance Average value durin g switching transition. Used for determining series termination value. –3 0–  AGP Clock Outputs (Lump Capacitance Test Load = 30 pF) Parameter Description Test Condition/Comments Min. Typ. Max. Unit tP Period Measured on rising edge at 1.5V 15 – – ns tH High Time Duration of clock cycle above 2.4V 5.25 – – ns tL Low Time Duration of clock cycle below 0.4V 5.05 – – ns tR Output Rise Edge Rate Measured from 0.4V to 2.4V 1 – 4 V/ns tF Output Fall Edge Rate Measured from 2.4V to 0.4V 1 – 4 V/ns tD Duty Cycle Measured on rising and falling edge at 1.5V 45 – 55 % tJC Jitter, Cycle-to-Cycle Measured on rising edge at 1.5V. Maximum difference of cycle time between two adjacent cycles. – – 500 ps tSK Output Skew Measured on rising edge at 1.5V – – 250 ps fST Frequency Stabilization from Power-up (cold start) Assumes full supply voltage reached within 1 ms from power-up. Short cycles exist prior to frequency stabilization. ––3 m s Zo AC Output Impedance Average value du ring switching transition. Used for determining series termination value. –3 0–  APIC Clock Output (Lump Capacitance Test Load = 20 pF) Parameter Description Test Condition/Comments Min. Typ. Max. Unit f Frequency, Actual Frequency generated from PCI divided by 2 PCI/2 MHz t R Output Rise Edge Rate Measured from 0.4V to 2.4V 0.5 2 V/ns tF Output Fall Edge Rate Measured from 2.4V to 0.4V 0.5 2 V/ns tD Duty Cycle Measured on rising and falling edge at 1.5V 45 55 % fST Frequency Stabilization from Power-up (cold start) Assumes full supply voltage reached within 1 ms from power-up. Short cycles exist prior to frequency stabilization. 3m s Zo AC Output Impedance Average value during switching transition. Used for determining series termination value. 40 

REF Clock Output (Lump Capacitance Test Load = 20 pF) Parameter Description Test Condition/Comments Min. Typ. Max. Unit f Frequency, Actual Frequency generated by crystal oscillator 14.318 MHz tR Output Rise Edge Rate Measured from 0.4V to 2.4V 0.5 – 2 V/ns tF Output Fall Edge Rate Measured fr om 2.4V to 0.4V 0.5 – 2 V/ns tD Duty Cycle Measured on rising and falling edge at 1.5V 45 – 55 % fST Frequency Stabilization from Power-up (cold start) Assumes full supply voltage reached within 1 ms from power-up. Short cycles exist prior to frequency stabilization. ––3 m s Zo AC Output Impedance Average value during switching transition. Used for determining series termination value. –4 0–  48-MHz Clock Output (Lump Capacitance Test Load = 20 pF) Parameter Description Test Condition/Comments Min. Typ. Max. Unit f Frequency, Actual Determined by PLL divider ratio (see m/n below) 48.008 MHz fD Deviation from 48 MHz (48.008 – 48)/48 +167 ppm m/n PLL Ratio (14.31818 MHz x 57/17 = 48.008 MHz) 57/17 t R Output Rise Edge Rate Measured from 0.4V to 2.4V 0.5 – 2 V/ns tF Output Fall Edge Rate Measured fr om 2.4V to 0.4V 0.5 – 2 V/ns tD Duty Cycle Measured on rising and falling edge at 1.5V 45 – 55 % fST Frequency Stabilization from Power-up (cold start) Assumes full supply voltage reached within 1 ms from power-up. Short cycles exist prior to frequency stabilization. ––3 m s Zo AC Output Impedance Average value during switching transition. Used for determining series termination value. –4 0–  24-MHz Clock Output (Lump Capacitance Test Load = 20 pF) Parameter Description Test Condition/Comments Min. Typ. Max. Unit f Frequency, Actual Determined by PLL divider ratio (see m/n below) 24.004 MHz f D Deviation from 24 MHz (24.004 – 24)/24 +167 ppm m/n PLL Ratio (14.31818 MHz x 57/34 = 24.004 MHz) 57/34 t R Output Rise Edge Rate Measured from 0.4V to 2.4V 0.5 – 2 V/ns tF Output Fall Edge Rate Measured fr om 2.4V to 0.4V 0.5 – 2 V/ns tD Duty Cycle Measured on rising and falling edge at 1.5V 45 – 55 % fST Frequency Stabilization from Power-up (cold start) Assumes full supply voltage reached within 1 ms from power-up. Short cycles exist prior to frequency stabilization. ––3 m s Zo AC Output Impedance Average value during switching transition. Used for determining series termination value. –4 0 – a 

Package Drawing and Dimension

Ordering Information

Ordering Code Package Type Product Flow W311H 48-pin SSOP Commercial, 0°C to 70°C W311HT 48-pin SSOP - Tape and Reel Commercial, 0°C to 70°C Lead-free CYW311OXC 48-pin SSOP Commercial, 0°C to 70°C CYW311OXCT 48-pin SSOP - Tape and Reel Commercial, 0°C to 70°C 4 8 - L e a dS h r u n kS m a l lO u t l i n eP a c k a g eO 4 8

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Austin, TX 78701 USA ClockBuilder Pro One-click access to Timing tools, documentation, software, source code libraries & more. Available for Windows and iOS (CBGo only). www.silabs.com/CBPro Timing Portfolio www.silabs.com/timing SW/HW www.silabs.com/CBPro Quality www.silabs.com/quality Support and Community community.silabs.com Disclaimer Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products are not designed or authorized to be used within any Life Support System without the specific written consent of Silicon Laboratories. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant personal injury or death. Silicon Laboratories products are not designed or authorized for military applications. Silicon Laboratories products shall under no circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons. Trademark Information Silicon Laboratories Inc.® , Silicon Laboratories®, Silicon Labs®, SiLabs® and the Silicon Labs logo®, Bluegiga®, Bluegiga Logo®, Clockbuilder®, CMEMS®, DSPLL®, EFM®, EFM32®, EFR, Ember®, Energy Micro, Energy Micro logo and combinations thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZRadio®, EZRadioPRO®, Gecko®, ISOmodem®, Precision32®, ProSLIC®, Simplicity Studio®, SiPHY®, Telegesis, the Telegesis Logo®, USBXpress® and others are trademarks or registered trademarks of Silicon Laborato- ries Inc. ARM, CORTEX, Cortex-M3 and THUMB are trademarks or registered trademarks of ARM Holdings. Keil is a registered trademark of ARM Limited. All other products or brand names mentioned herein are trademarks of their respective holders.