IDT2305A IDT | Alldatasheet

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COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT2305A 3.3V ZERO DELAY CLOCK BUFFER JULY 2004 2004 Integrated Device Technology, Inc. DSC 6586/3c COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES The IDT logo is a registered trademark of Integrated Device Technology, Inc. FEATURES:

  • Phase-Lock Loop Clock Distribution
  • 10MHz to 133MHz operating frequency
  • Distributes one clock input to one bank of five outputs
  • Zero Input-Output Delay
  • Output Skew < 250ps
  • Low jitter <200 ps cycle-to-cycle
  • IDT2305A-1 for Standard Drive
  • IDT2305A-1H for High Drive
  • No external RC network required
  • Operates at 3.3V V DD
  • Power down mode
  • Available in SOIC package FUNCTIONAL BLOCK DIAGRAM IDT2305A3.3V ZERO DELAY CLOCK BUFFER PLL CLK1 CLK2 CLK3 CLK4 Control LogicREF CLKOUT DESCRIPTION: The IDT2305A is a high-speed phase-lock loop (PLL) clock buffer, designed to address high-speed clock distribution applications. The zero delay is achieved by aligning the phase between the incoming clock and the output clock, operable within the range of 10 to 133MHz. The IDT2305A is an 8-pin version of the IDT2309A. IDT2305A accepts one reference input, and drives out five low skew clocks. The -1H version of this device operates up to 133MHz frequency and has a higher drive than the -1 device. All parts have on-chip PLLs which lock to an input clock on the REF pin. The PLL feedback is on-chip and is obtained from the CLKOUT pad. In the absence of an input clock, the IDT2305A enters power down. In this mode, the device will draw less than 12µA for Commercial Tempera- ture range and less than 25µA for Industrial temperature range , the outputs are tri-stated, and the PLL is not running, resulting in a significant reduction of power. The IDT2305A is characterized for both Industrial and Commercial operation.

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT2305A 3.3V ZERO DELAY CLOCK BUFFER REF CLK1 CLK2 GND CLKOUT CLK4 VDD CLK3 PIN CONFIGURATION SOIC TOP VIEW Symbol Rating Max. Unit VDD Supply Voltage Range –0.5 to +4.6 V VI (2) Input Voltage Range (REF) –0.5 to +5.5 V VI Input Voltage Range –0.5 to V (except REF) V DD+0.5 IIK (VI < 0) Input Clamp Current –50 mA IO (VO = 0 to VDD) Continuous Output Current ±50 mA VDD or GND Continuous Current ±100 mA TA = 55°C Maximum Power Dissipation 0.7 W (in still air)(3) TSTG Storage Temperature Range –65 to +150 °C Operating Commercial Temperature 0 to +70 ° C Temperature Range Operating Industrial Temperature -40 to +85 °C Temperature Range NOTES: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed. 3. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils. NOTES: 1. Weak pull down. 2. Weak pull down on all outputs. PIN DESCRIPTION ABSOLUTE MAXIMUM RATINGS(1) APPLICATIONS:

  • SDRAM
  • Telecom
  • Datacom
  • PC Motherboards/Workstations
  • Critical Path Delay Designs Pin Name Pin Number Type Functional Description REF(1) 1 IN Input reference clock, 5 Volt tolerant input CLK2(2) 2 Out Output clock CLK1(2) 3 Out Output clock GND 4 Ground Ground CLK3(2) 5 Out Output clock VDD 6 PWR 3.3V Supply CLK4(2) 7 Out Output clock CLKOUT (2) 8 Out Output clock, internal feedback on this pin

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT2305A 3.3V ZERO DELAY CLOCK BUFFER Symbol Parameter Min. Max. Unit VDD Supply Voltage 3 3.6 V TA Operating Temperature (Ambient Temperature) 0 70 °C CL Load Capacitance < 100MHz — 30 pF Load Capacitance 100MHz - 133MHz — 10 CIN Input Capacitance — 7 pF OPERATING CONDITIONS - COMMERCIAL DC ELECTRICAL CHARACTERISTICS - COMMERCIAL Symbol Parameter Conditions Min. Max. Unit VIL Input LOW Voltage Level — 0.8 V VIH Input HIGH Voltage Level 2 — V IIL Input LOW Current V IN = 0V — 50 µA IIH Input HIGH Current V IN = VDD — 100 µA VOL Output LOW Voltage Standard Drive I OL = 8mA — 0.4 V High Drive I OL = 12mA (-1H) VOH Output HIGH Voltage Standard Drive I OH = -8mA 2.4 — V High Drive I OH = -12mA (-1H) IDD_PD Power Down Current REF = 0MHz — 12 µA IDD Supply Current Unloaded Outputs at 66.66MHz — 32 mA SWITCHING CHARACTERISTICS (2305A-1) - COMMERCIAL (1,2) Symbol Parameter Conditions Min. Typ. Max. Unit t1 Output Frequency 10pF Load 10 — 133 MHz 30pF Load 10 — 100 Duty Cycle = t 2 ÷ t1 Measured at 1.4V, FOUT = 66.66MHz 40 50 60 % t3 Rise Time Measured between 0.8V and 2V — — 2.5 ns t4 Fall Time Measured between 0.8V and 2V — — 2.5 ns t5 Output to Output Skew All outputs equally loaded — — 250 ps t6 Delay, REF Rising Edge to CLKOUT Rising Edge Measured at VDD/2 — 0 ±350 ps t7 Device-to-Device Skew Measured at V DD/2 on the CLKOUT pins of devices — 0 700 ps tJ Cycle-to-Cycle Jitter, pk - pk Measured at 66.66MHz, loaded outputs — — 200 ps tLOCK PLL Lock Time Stable power supply, valid clock presented on REF pin — — 1 ms NOTES: 1. REF Input has a threshold voltage of V DD/2. 2. All parameters specified with loaded outputs.

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT2305A 3.3V ZERO DELAY CLOCK BUFFER Symbol Parameter Min. Max. Unit VDD Supply Voltage 3 3.6 V TA Operating Temperature (Ambient Temperature) -40 +85 °C CL Load Capacitance < 100MHz — 30 pF Load Capacitance 100MHz - 133MHz — 10 CIN Input Capacitance — 7 pF OPERATING CONDITIONS - INDUSTRIAL SWITCHING CHARACTERISTICS (2305A-1H) - COMMERCIAL (1,2) Symbol Parameter Conditions Min. Typ. Max. Unit t1 Output Frequency 10pF Load 10 — 133 MHz 30pF Load 10 — 100 Duty Cycle = t 2 ÷ t1 Measured at 1.4V, FOUT = 66.66MHz 40 50 60 % Duty Cycle = t 2 ÷ t1 Measured at 1.4V, F OUT <50MHz 45 50 55 % t3 Rise Time Measured between 0.8V and 2V — — 1.5 ns t4 Fall Time Measured between 0.8V and 2V — — 1.5 ns t5 Output to Output Skew All outputs equally loaded — — 250 ps t6 Delay, REF Rising Edge to CLKOUT Rising Edge Measured at VDD/2 — 0 ±350 ps t7 Device-to-Device Skew Measured at V DD/2 on the CLKOUT pins of devices — 0 700 ps t8 Output Slew Rate Measured between 0.8V and 2V using Test Circuit #2 1 — — V/ns tJ Cycle-to-Cycle Jitter, pk - pk Measured at 66.66MHz, loaded outputs — — 200 ps tLOCK PLL Lock Time Stable power supply, valid clock presented on REF pin — — 1 ms NOTES: 1. REF Input has a threshold voltage of V DD/2. 2. All parameters specified with loaded outputs. DC ELECTRICAL CHARACTERISTICS - INDUSTRIAL Symbol Parameter Conditions Min. Max. Unit VIL Input LOW Voltage Level — 0.8 V VIH Input HIGH Voltage Level 2 — V IIL Input LOW Current V IN = 0V — 50 µA IIH Input HIGH Current V IN = VDD — 100 µA VOL Output LOW Voltage Standard Drive I OL = 8mA — 0.4 V High Drive I OL = 12mA (-1H) VOH Output HIGH Voltage Standard Drive I OH = -8mA 2.4 — V High Drive I OH = -12mA (-1H) IDD_PD Power Down Current REF = 0MHz — 25 µA IDD Supply Current Unloaded Outputs at 66.66MHz — 35 mA

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT2305A 3.3V ZERO DELAY CLOCK BUFFER SWITCHING CHARACTERISTICS (2305A-1) - INDUSTRIAL (1,2) Symbol Parameter Conditions Min. Typ. Max. Unit t1 Output Frequency 10pF Load 10 — 133 MHz 30pF Load 10 — 100 Duty Cycle = t 2 ÷ t1 Measured at 1.4V, FOUT = 66.66MHz 40 50 60 % t3 Rise Time Measured between 0.8V and 2V — — 2.5 ns t4 Fall Time Measured between 0.8V and 2V — — 2.5 ns t5 Output to Output Skew All outputs equally loaded — — 250 ps t6 Delay, REF Rising Edge to CLKOUT Rising Edge Measured at VDD/2 — 0 ±350 ps t7 Device-to-Device Skew Measured at V DD/2 on the CLKOUT pins of devices — 0 700 ps tJ Cycle-to-Cycle Jitter, pk - pk Measured at 66.66MHz, loaded outputs — — 200 ps tLOCK PLL Lock Time Stable power supply, valid clock presented on REF pin — — 1 ms NOTES: 1. REF Input has a threshold voltage of V DD/2. 2. All parameters specified with loaded outputs. SWITCHING CHARACTERISTICS (2305A-1H) - INDUSTRIAL (1,2) Symbol Parameter Conditions Min. Typ. Max. Unit t1 Output Frequency 10pF Load 10 — 133 MHz 30pF Load 10 — 100 Duty Cycle = t 2 ÷ t1 Measured at 1.4V, FOUT = 66.66MHz 40 50 60 % Duty Cycle = t 2 ÷ t1 Measured at 1.4V, F OUT <50MHz 45 50 55 % t3 Rise Time Measured between 0.8V and 2V — — 1.5 ns t4 Fall Time Measured between 0.8V and 2V — — 1.5 ns t5 Output to Output Skew All outputs equally loaded — — 250 ps t6 Delay, REF Rising Edge to CLKOUT Rising Edge Measured at VDD/2 — 0 ±350 ps t7 Device-to-Device Skew Measured at V DD/2 on the CLKOUT pins of devices — 0 700 ps t8 Output Slew Rate Measured between 0.8V and 2V using Test Circuit #2 1 — — V/ns tJ Cycle-to-Cycle Jitter, pk - pk Measured at 66.66MHz, loaded outputs — — 200 ps tLOCK PLL Lock Time Stable power supply, valid clock presented on REF pin — — 1 ms NOTES: 1. REF Input has a threshold voltage of V DD/2. 2. All parameters specified with loaded outputs. ZERO DELAY AND SKEW CONTROL All outputs should be uniformly loaded in order to achieve Zero I/O Delay. Since the CLKOUT pin is the internal feedback for th e PLL, its relative loading can affect and adjust the input/output delay. For designs utilizing zero I/O Delay, all outputs including CLKOUT must be equally loaded. Even if the output is not used, it must have a capacitive load equal to that on the other outputs in order to obtain true zero I/O Delay. If I/O Delay adjustments are needed, use the Output Load Difference diagram to calculate loading differences between the CLKOUT pin and other outputs. For zero output-to-output skew, all outputs must be loaded equally.

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT2305A 3.3V ZERO DELAY CLOCK BUFFER VDD OUTPUTS VDD GND GND 0.1µF 0.1µF VDD OUTPUTS 10pF VDD GND GND 0.1µF 0.1µF 1KΩ 1KΩ C LOAD CLK OUT CLK OUT Output 1.4V 1.4V Output REF VDD/2 Output CLK OUT Device 1 CLK OUT Device 2 VDD/2 VDD /2 VDD /2 1.4V1.4V 1.4V 2V0.8V t3 t4 0.8V 3.3V 2VOutput All Outputs Rise/Fall Time Input to Output Propagation Delay Device to Device Skew Output to Output SkewDuty Cycle Timing SWITCHING WAVEFORMS Test Circuit 1 (all Parameters Except t8) Test Circuit 2 (t8, Output Slew Rate On -1H Devices) TEST CIRCUITS

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT2305A 3.3V ZERO DELAY CLOCK BUFFER

ORDERING INFORMATION

Ordering Code Package Type Operating Range IDT2305A-1DC 8-Pin SOIC Commercial IDT2305A-1DCG 8-Pin SOIC Commercial IDT2305A-1DCGI 8-Pin SOIC Industrial IDT2305A-1DCI 8-Pin SOIC Industrial IDT2305A-1HDC 8-Pin SOIC Commercial IDT2305A-1HDCG 8-Pin SOIC Commercial IDT2305A-1HDCGI 8-Pin SOIC Industrial IDT2305A-1HDCI 8-Pin SOIC Industrial CORPORATE HEADQUARTERS for SALES: for Tech Support: 2975 Stender Way 800-345-7015 or 408-727-6116 logichelp@idt.com Santa Clara, CA 95054 fax: 408-492-8674 (408) 654-6459 www.idt.com IDT XXXXX XX X Package ProcessDevice Type 2305A-1 2305A-1H Zero Delay Clock Buffer with High Drive DC DCG Small Outline IC SOIC - Green Blank I Commercial (0oC to +70oC) Industrial (-40oC to +85oC)