IDT23S05T 2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT23S05T 2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE FEATURES: • • • • • • • • • • • DESCRIPTION: 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 No external RC network required Operates at 2.5V VDD Power down mode Spread spectrum compatible Available in SOIC package The IDT23S05T 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 IDT23S05T is an 8-pin version of the IDT23S09T. IDT23S05T accepts one reference input, and drives out five low skew clocks. 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 IDT23S05T enters power down. In this mode, the device will draw less than 12µA for Commercial Temperature Range and and less than 25µA for Industrial temperature range, the outputs are tristated, and the PLL is not running, resulting in a significant reduction of power. The IDT23S05T is characterized for both Industrial and Commercial operation. FUNCTIONAL BLOCK DIAGRAM 8 CLKOUT REF 1 3 PLL CLK1 Control Logic 2 5 CLK2 CLK3 7 CLK4 The IDT logo is a registered trademark of Integrated Device Technology, Inc. COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES MAY 2010 1 c 2006 Integrated Device Technology, Inc. DSC 6397/11 IDT23S05T 2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES ABSOLUTE MAXIMUM RATINGS(1) PIN CONFIGURATION Symbol REF 1 8 CLKOUT CLK2 2 7 CLK4 CLK1 3 6 VDD GND 4 5 CLK3 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) IIK (VI < 0) Input Clamp Current IO (VO = 0 to VDD) VDD or GND TA = 55°C VDD+0.5 –50 mA Continuous Output Current ±50 mA Continuous Current ±100 mA Maximum Power Dissipation 0.7 W TSTG Storage Temperature Range –65 to +150 °C Operating Commercial 0 to +70 °C Temperature Industrial (in still air)(3) SOIC TOP VIEW –40 to +85 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. APPLICATIONS: • • • • • SDRAM Telecom Datacom PC Motherboards/Workstations Critical Path Delay Designs PIN DESCRIPTION Pin Name REF Pin Number Type Functional Description 1 IN Input reference clock, 3.3V tolerant input CLK2(2) 2 Out Output clock CLK1 3 Out Output clock 4 Ground (1) (2) GND CLK3 (2) VDD CLK4 (2) CLKOUT (2) Ground 5 Out Output clock 6 PWR 2.5V Supply 7 Out Output clock 8 Out Output clock, internal feedback on this pin NOTES: 1. Weak pull down. 2. Weak pull down on all outputs. 2 IDT23S05T 2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES OPERATING CONDITIONS Symbol Parameter VDD Supply Voltage TA Operating Temperature (Ambient Temperature) Commercial Industrial Min. Max. Unit 2.3 2.7 V °C 0 +70 –40 +85 CL Load Capacitance 10MHz - 133MHz — 15 pF CIN Input Capacitance — 7 pF DC ELECTRICAL CHARACTERISTICS Symbol Parameter Conditions Min. Max. Unit VIL Input LOW Voltage Level — 0.7 V VIH Input HIGH Voltage Level 1.7 — V IIL Input LOW Current VIN = 0V — 50 µA IIH Input HIGH Current VIN = VDD — 100 µA VOL Output LOW Voltage Standard Drive, IOL = 8mA — 0.3 V VOH Output HIGH Voltage Standard Drive, IOH = -8mA IDD_PD Power Down Current REF = 0MHz Supply Current Unloaded Outputs at 66.66MHz IDD 2 — V Commercial — 12 µA Industrial — 25 — 32 mA (1,2) SWITCHING CHARACTERISTICS Symbol t1 Parameter Output Frequency Conditions 15pF Load Min. Typ. Max. Unit 10 — 133 MHz Duty Cycle = t2 ÷ t1 Measured at VDD/2, FOUT = 66.66MHz 40 50 60 % t3 Rise Time Measured between 0.7V and 1.7V — — 2.5 ns t4 Fall Time Measured between 0.7V and 1.7V — — 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 VDD/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 PLL Lock Time Stable power supply, valid clock presented on REF pin — — 1 ms tLOCK NOTES: 1. REF Input has a threshold voltage of VDD/2. 2. All parameters specified with loaded outputs. 3 IDT23S05T 2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES 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 the 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. For zero output-to-output skew, all outputs must be loaded equally. SPREAD SPECTRUM COMPATIBLE Many systems being designed now use a technology called Spread Spectrum Frequency Timing Generation. This product is designed not to filter off the Spread Spectrum feature of the reference input, assuming it exists. When a zero delay buffer is not designed to pass the Spread Spectrum feature through, the result is a significant amount of tracking skew, which may cause problems in systems requiring synchronization. 4 IDT23S05T 2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES TEST CIRCUIT VDD 0.1 F CLKOUT OUTPUTS CLOAD VDD 0.1 F GND GND Test Circuit for All Parameters SWITCHING WAVEFORMS t1 Output VDD/2 t2 VDD/2 VDD/2 VDD/2 VDD/2 Output t5 Output to Output Skew Duty Cycle Timing Output 0.7V t3 1.7V 1.7V 0.7V 2.5V VDD/2 REF 0V t4 VDD/2 Output t6 Input to Output Propagation Delay All Outputs Rise/Fall Time CLKOUT Device 1 CLKOUT Device 2 VDD/2 t7 VDD/2 Device to Device Skew 5 IDT23S05T 2.5V ZERO DELAY CLOCK BUFFER, SPREAD SPECTRUM COMPATIBLE COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES ORDERING INFORMATION IDT XXXXX Device Type XX Package X Process Blank I Commercial (0oC to +70oC) Industrial (-40oC to +85oC) DC DCG Small Outline SOIC - Green 23S05T-1 2.5V Zero Delay Clock Buffer, Spread Spectrum Compatible Part / Order Number Shipping Packaging Package 23S05T-1DCG 23S05T-1DCG8 23S05T-1DCGI 23S05T-1DCGI8 Tubes Tape and Reel Tubes Tape and Reel 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC CORPORATE HEADQUARTERS 6024 Silver Creek Valley Road San Jose, CA 95138 Temperature for SALES: 800-345-7015 or 408-284-8200 fax: 408-284-2775 www.idt.com 6 0° to +70° C 0° to +70° C -40° to +85°C -40° to +85°C for Tech Support: [email protected]