C5001

C5001 ETC2

Document overview

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Technical content

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev. 2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 1 of 13 Product Features /G83 Produces PCI output clocks that are individually selectable for 33.3 or 66.6 MHz under I2C or strapping control. /G83 Separate output buffer power supply for reduced noise, crosstalk and jitter. /G83 input clock frequency standard 14.31818 MHz /G83 Output clocks frequency individually selectable via I2C or hardware bi-directional pin strapping. /G83 SSCG EMI reduction at 1.0% width /G83 Individual clock disables via I2C control /G83 All output clocks skewed within a 500 pS window /G83 Cycle to Cycle jitter ± 250 pS /G83 Output duty cycle is automatically 50% (±10%) adjusted /G83 Clock feed through mode and OE pins for logic testing /G83 Glitchless clock enabling and disabling transitions /G83 28-pin TSSOP or SSOP package Block Diagram Output Enable logic Functionality Table OE CLK(0:9) PLL 1 (HIGH) Enabled Running 0 (LOW) Tri State Running Pin Configuration VDD1 REF-CLK0/S0 CLK1/S1 VSS VDD2 CLK2/S2 CLK3/S3 VSS VDD3 CLK4/S4 CLK5/S5 VSS VDD4 CLK6/S6 VDD XIN XOUT VSS OE SCLK SDATA VSS VSS CLK9/S9 CLK8/S8 VDD5 VSS CLK7/S7 16. XIN SCLK SDATA XOUT CLK4/S4 CLK1/S1 REF- CLK0/S0 CLK2/S2 CLK3/S3 CLK7/S7 CLK8/S8 CLK9/S9 CLK5/S5 CLK6/S6 I2C LOGIC ÷1 ÷2 ÷1 ÷2 ÷1 ÷2 ÷1 ÷2 ÷1 ÷2 ÷1 ÷2 ÷1 ÷2 ÷1 ÷2 ÷1 ÷2 ÷1 ÷2 ÷4, ÷8 PLL OE M U X Reference Oscillator

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 2 of 13 Pin Description Pin Number Pin Name PWR I/O Description

2 XIN VDDA I This pin is the connection point for the devices Loop

reference frequency. This may be either a CMOS 3.3 volt reference clock or the output of an external crystal. A nominal 14.31818 MHz frequency must be supplied to obtain the frequencies listed on this data sheet

3 XOUT VDDA O This pin the devices output drive that is to be used when

an external crystal is used. In this configuration the device provides the analog gain function of a crystal oscillator. When the device is being supplied with an external reference frequency, this pin is left disconnected.

1 VDDA - PWR This pin is the power supply source for the internal PLL

circuitry and core control logic. It should be bypassed separately from all other device VDD supply pins. 5 OE - I Output Enable. See logic table on page 1 for functionality 12, 16, 20, 24, 28 VDD - PWR Logic power for All buffers

6 SDATA VDDA I/O I 2C Serial data pin

7 SCLK VDDA O I 2C serial interface clock pin

27 REF-

26 CLK1/S1 VDD1 O

23 CLK2/S2 VDD2 O

22 CLK3/S3 VDD2 O

19 CLK4/S4 VDD3 O

18 CLK5/S5 VDD3 O

15 CLK6/S6 VDD4 O

14 CLK7/S7 VDD4 O

11 CLK8/S8 VDD5 O

10 CLK9/S9 VDD5 O

Individual output clocks and power up divisor select pins. Each of these pins is both a clock output pin and, at power up, a temporary input pin. When they act as an input pin they set the initial output frequency of the device to either the input frequency or half of the input frequency. Subsequently, the divisor may be changed or disabled via the device’s I2C register bits. Reference clock and its programmable input value are saved internally for when it PCI clock function is selected. VSS - PWR Ground pins for the chip.

1 VDD - PWR Power for core logic

28 VDD1 - PWR Power for CLK1 and CLK2 output buffers

24 VDD2 - PWR Power for CLK3 and CLK4 output buffers

20 VDD3 - PWR Power for CLK5 and CLK6 output buffers

16 VDD4 - PWR Power for CLK7 and CLK8 output buffers

12 VDD5 - PWR Power for CLK9 and CLK10 output buffers

A bypass capacitor (0.1 mF) should be placed as close as possible to each Vdd pin.

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 3 of 13 Spectrum Spread Clocking Spectrum Analysis Spectrum Spreading Selection Table Unspread Frequency in MHz Down Spreading Desired (actual) F Min (MHz) F Center (MHz) F Max (MHz) Spread (%) Frequency (MHz) Amplitude (dB) Without Spectrum SpreadWith Spectrum Spread Down Spread

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 4 of 13 Power Up Bi-Directional Pin Timing (all clock outputs) Note: a pull-up or logic high programming voltage will select a 66.6 MHz output clock frequency on that specific pin. A logic low level will select a 33.3 MHz clock frequency in that specific pin. Output Frequency Selections The device contains 3 specific output mode type pins. They are: REF-CLK0/S0 This pin powers up as a 33.3 or 66.6 MHz PCI clock. Via I 2C command byte 1 bit 4 it may be changed to be a 14.318 MHz PCI clock. When it is acting as a PCI clock its frequency may be changed between 33 and 66 MHz using I2C command byte 1 bit 3. The PCI clock may also be initially set at device power up using the bi-directional programming capability of the pin (device pin number 27) CLK(1:8) These are dual frequency PCI clock pins that may be stopped enabled and have their frequency changed at power up and then on the fly (at any time) via their respective I2C register control bits. CLK9/S9 This bit acts in the same manner as the CLK (1:8) bits. Additionally by selection in I 2C byte 3 Bits 5 and 6 it can output both 16.5 MHz or 8.25 MHz on its pin. Like the other clock pins I2C byte 3 Bit 6 is initially set (via the clocks bi-directional; pin function) at power up depending on the level of the clocks pin. NOTE: Clocks REF-CLK0/S0 (pin 27) and CLK1/S1 (pin 26) are powered from VDD1 (pin 28). This data sheet characterizes the guaranteed performance of these 2 clocks with respect to jitter and skew. Designers that use this device need to understand that if these 2 clocks are operated at different frequencies (i.e., pin 27 is set to the REF output mode while pin 26 is enabled at either 33 pr 66 MHz frequency mode) that the data sheet values of these clocks will not be guaranteed. It is therefor prudent to disable the CLK1 output when the REF-CLK0/S0 output has been programmed to output a 14.31818 MHz clock to realize the devices best performance. Power Supply VDD CLK (0:9) Hi-Z (tristate), inputs Toggle, outputs Fig.1

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 5 of 13 Application Note for Selection on Bi-Directional Pins Pins 10, 11, 14, 15, 18, 19, 22, 23, 26 and 27 are Power up bi-directional pins and are used for selecting power up output frequencies of this devices output clocks (see Pin description, Page 2). During power-up of the device, these pins are in input mode, therefore, they are considered input select pins internal to the IC, these pins have a large value pull-up each (250KΩ), therefore, a selection “1” is the default and will select a 66 MHz output frequency. If the system uses a slow power supply (over 5 ms settling time), then it is recommended to use an external pull-up (Rup) in order to insure a high selection. In this case, the designer may choose one of two configurations, see FIG. 3A and Fig. 3B. Fig. 3A represents an additional pull up resistor 50KΩ connected from the pin to the power line, which allows a faster pull to a high level. If a selection “0” is desired, then a jumper is placed on JP1 to a 5KΩ resistor as implemented as shown in Fig. 3A. Please note the selection resistors (Rup and Rdn) are placed before the Damping resistor (Rd) close to the pin. Fig. 3B represents a single resistor 10KΩ connected to a 3-way jumper, JP2. When a “1” selection is desired, a jumper is placed between leads 1 and 3. When a “0” selection is desired, a jumper is placed between leads 1 and 2. If the system power supply is fast (less than 5 mSec settling time), then Fig. 3A only applies and Pull up Rup resistor is not necessary. The electrical length of the trace that connects the selection resistor to the devices pin should be kept as short as possible. Load Load Fig.3A Fig.3B Vdd Vdd Rup 50K Rd C5001 Bidirectional JP1 JUMPER JP2

3 Way Jumper

Input and Output Relationships The device acts a PCI clock generator. Output clocks may be individually controlled to be either 33.3 or 66.6 MHz in frequency by setting or clearing the clocks respective I2C control register bit. All output clocks are rising edge aligned to within a shared 500 pS window. There is no specified relationship between the input reference clock and the output clocks.

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 6 of 13 Clock Enable Functions and Timing Each output clock may be either disabled or enabled by either setting or clearing its respective I2C register control bit. All clocks are stopped in the low state. All clocks maintain a valid high period before transitioning from running to stopped. The clocks transition between running and stopped occurs immediately after the I 2C register bit is cleared and the clock transitions to a low state. See figure below. Internal Clock I2C Register BIT

2 Output

1 Output

A: represents one output ÷2 clock cycle (one 33.3 MHz cycle period). B: represents one output clock ÷ 1 cycle (one 66.6 MHz cycle period).. Output Frequency Change Relationships The I2C registers are initially set (initialized) by the voltage levels present on the clocks output pins at power up. Subsequently these bits may be changed via I2C commands. Output clocks have the capability to be changed, on the fly, via the devices I2C register bits. If Synchronous switching is required, it may be achieved by first disabling a specific clock, changing its frequency and then re-enabling it via the I2C register control bits that are provided for these functions. Synchronous switching is defines at the changing of the output frequency of a clock from one frequency to another in such a manner as to not produce any clock cycles shorter than the higher of the 2 frequencies or longer than the period of the lower of the 2 frequencies. The disable and enable I2C register bit control of each clock is logically implemented to eliminate clock glitches when each clock is either enabled or enabled. CAUTION: Switching clock frequencies without first disabling the clock may produce an output clock glitch (short or stretched period clock) during frequency transition! B A

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 7 of 13 2-Wire I2C Control Interface The 2-wire control interface implements write block mode write only slave interface. Sub addressing is not supported, thus all preceding bytes must be sent in order to read or change one of the control bytes. The 2-wire control interface allows each clock output to be individually controlled. During normal data transfer, the SDATA signal only changes when the SDCLK signal is low, and is stable when SDCLK is high. There are two exceptions to this. A high to low transition on SDATA while SDCLK is high is used to indicate the start of a data transfer cycle. A low to high transition on SDATA while SDCLK is high indicates the end of a data transfer cycle. Data is always sent as complete 8-bit bytes, after which an acknowledge is generated. The first byte of a transfer cycle is a 7-bit address with a Read/Write bit as the LSB (bit 0). Data is transferred MSB (bit 7) first. The device will respond to writes up to 6 bytes (max) of data to address D2. The device will not respond to any other control interface conditions. Serial Control Registers NOTE: The Pin# column lists the affected pin number where applicable. The @Pup column gives the state at true power up. Bytes are set to the values shown only on true power up. Following the acknowledge of the Address Byte (D2), two additional bytes must be sent: 1) “Command Code “ byte, and 2) “Byte Count” byte. Although the data (bits) in these two bytes are considered “don’t care”; they must be sent and will be acknowledged. After the Command Code and the Count bytes have been acknowledged, the described sequence below (Byte 0, Byte 1, Byte2,) will be valid and acknowledged. Byte 0: Function Select Register (1 = enable, 0 = Stopped) Bit @Pup Pin# Description 7 1 14 CLK7 (Active = 1, Forced low = 0) 6 1 15 CLK6 (Active = 1, Forced low = 0) 5 1 18 CLK5 (Active = 1, Forced low = 0) 4 1 19 CLK4 (Active = 1, Forced low = 0) 3 1 22 CLK3 (Active = 1, Forced low = 0) 2 1 23 CLK2 (Active = 1, Forced low = 0) 1 1 26 CLK1 (Active = 1, Forced low = 0) 0 1 27 CLK0 (Active = 1, Forced low = 0)

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 8 of 13 Serial Control Registers (Cont.) Byte 1: Clock Register (1 = enable, 0 = Stopped) Bit @Pup Pin# Description 7 1 - 0= Test Mode ( XIN replaces VCO output ), 1=Normal 6 0 10 Bit 6 Bit 5 PCI9 Frequency

5 HW 10 0 0 33 MHz

1 0 16.5 MHz 1 1 8.25 MHz 4 0 27 REF-CLK0 mode ( 1 = REF, 0 = PCI0 ) 3 HW 27 CLK0 (33.3 MHz = 0, 66.6 MHz = 1)(if Byte 3 Bit 4=0) 2 0 - SSCG (OFF = 0, ON = 1) 1 1 10 CLK9 ( Active = 1, Forced low = 0 ) 0 1 11 CLK8 ( Active = 1, Forced low = 0 ) Byte 2: Clock Register (1 = 66.6 MHz, 0 = 33.3 MHz) Bit @Pup Pin# Description 7 HW 11 CLK8 (33.3 MHz = 0, 66.6 MHz = 1) 6 HW 14 CLK7 (33.3 MHz = 0, 66.6 MHz = 1) 5 HW 15 CLK6 (33.3 MHz = 0, 66.6 MHz = 1) 4 HW 18 CLK5 (33.3 MHz = 0, 66.6 MHz = 1) 3 HW 19 CLK4 (33.3 MHz = 0, 66.6 MHz = 1) 2 HW 22 CLK3 (33.3 MHz = 0, 66.6 MHz = 1) 1 HW 23 CLK2 (33.3 MHz = 0, 66.6 MHz = 1) 0 HW 26 CLK1 (33.3 MHz = 0, 66.6 MHz = 1) Note: HW = Power up programmed via hardware (voltage at pin).

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 9 of 13 Maximum Ratings Voltage Relative to VSS: -0.3V Voltage Relative to VDD: 0.3V Storage Temperature: 0ºC to + 125ºC Operating Temperature: 0ºC to +70ºC Maximum Power Supply: 7V This device contains circuitry to protect the inputs against damage due to high static voltages or electric field; however, precautions should be taken to avoid application of any voltage higher than the maximum rated voltages to this circuit. For proper operation, Vin and Vout should be constrained to the range: VSS<(Vin or Vout)<VDD Unused inputs must always be tied to an appropriate logic voltage level (either VSS or VDD). DC Parameters Characteristic Symbol Min Typ Max Units Conditions VDD supply 3.0 - 3.6 Vdc Temperature 0 70 ºC Input Low Voltage VIL - - 0.8 Vdc - Input High Voltage VIH 2.0 - - Vdc - Input Low Current IIL -100 µA Input High Current IIH 100 µA Tri-State leakage Current Ioz - - 10 µA Dynamic Supply Current Idd - - 150 mA All outputs fully loaded at 30 pF @ 66 MHz Static Supply Current - - 35 mA All outputs driven low with I 2C control 66 MHz

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 10 of 13 AC Parameters Characteristic Symbol Min Typ Max Units Conditions Input (REF) Duty Cycle - 40 50 60 % When external reference is used REF input frequency FREF 12 14.3 16 MHz Output Duty Cycle - 45 50 55 % Measured at 1.5V Skew from any output to any output tOFF CC 0 200 500 pS 30 pF Load, Measured at 1.5V (all outputs fall within a 500 pSec time window) Jitter Cycle to Cycle tJ pp -250 - +250 pS Any Output Output Freq. F O 30 33/66 70 MHz At device output pins Long term output jitter tJ lt -500 - +500 pS Any output, 2 minute sample Power up to output lock timeT∇ R TL - - 10 mS Measured from the point VDD reaches

3.15 Volts with a stable reference

T OEL - - 3 mS Measured in a stabilized environment where OE has been previously brought to a logic low level. Input Capacitance CIN - - 4 pF (FBIN and REF pins) VDD = VDDA =3.3V ±5%, TA = 0ºC to +70ºC Buffer Characteristics (All Output Clocks) Characteristic Symbol Min Typ Max Units Conditions Pull-Up Current IOH min 22 - - mA Vout = VDD - .5V Pull-Up Current IOH max - - -45 mA Vout = 1.5V Pull-Down Current IOL min 26 - - mA Vout = 0.4V Pull-Down Current IOL max - - 65 mA Vout = 1.5V Rise Time Min Between 0.4 V and 2.4 V TR min 0.4 - 2.5 nS 30 pF Load VDD= VDDA = 3.3V ±5%, TA = 0ºC to +70ºC

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 11 of 13 Package Drawing and Dimensions

28 Pin SSOP Outline Dimensions

SYMBOL MIN NOM MAX MIN NOM MAX e 0.0256 BSC 0.65 BSC B e E H a L C D A

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 12 of 13 Package Drawing and Dimensions (Cont.) BO SURFACES ROUGHNESS: 6+ 27n(RZ) D -B- 385 L20 R0.1 B e -C- C0.07 RD [10° TYP R1.30 1.0 SECTION V-V 0.05 MAX. 0.05 MAX. 1.0 1.0 E R0.15 A 0.25 R L A b c c1 DETAIL B .08 CB A DETAIL A 14° TYP

28 Pin TSSOP Dimensions

SYMBOL MIN NOM MAX MIN NOM MAX b 0.007 - 0.011 0.19 - 0.30 c 0.004 - 0.007 0.105 - 0.175 θ 0° - 8° 0° - 8° e 0.026 BSC 0.65 BSC

Low Skew Multiple Frequency PCI Clock Generator with EMI Reducing SSCG. Approved Product INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST. Rev.2.1 6/14/1999 MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571 Page 13 of 13

Ordering Information

Part Number Package Type Production Flow C5001B 28 PIN TSSOP Commercial, 0ºC to +70ºC C5001B 28 PIN SSOP Commercial, 0ºC to +70ºC Note: The ordering part number is formed by a combination of device number, device revision, package style, and screening as shown below. Marking: Example: IMI C5001BYB Date Code, Lot # C5001 B Y B Flow B = Commercial, 0ºC to + 70ºC Package Y = SSOP T = TSSOP Revision IMI Device Number NOTE: Purchase of I2C components of International Microcircuits, Inc. or one of its sublicensed Associated Companies conveys a license under the Phillips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Phillips.