ASM5P23S04AF-2-08-SR

November 2006 ASMP5P23S04A 3.3V ‘SpreadTrak’ Zero Delay Buffer rev 1.4 Features • • • • • • • • • • • • • Zero input - output propagation delay, adjustable by capacitive load on FBK input. Multiple configurations - Refer “ASM5P23S04A Configurations Table”. Input frequency range: 15 MHz to 133 MHz Multiple low-skew outputs. Output-output skew less than 200 pS. Device-device skew less than 500 pS. Two banks of two outputs each. Less than 200 pS cycle-to-cycle jitter • (-1, -1H, -2, -2H). FBK pin, and can be obtained from one of the outputs. The input-to-output propagation delay is guaranteed to be less than 250 pS, and the output-to-output skew is guaranteed to be less than 200 pS. The ASM5P23S04A has two banks of two outputs each. Multiple ASM5P23S04A devices can accept the same input clock and distribute it. In this case the skew between the outputs of the two devices is guaranteed to be less than 500 pS. The ASM5P23S04A (Refer is available in two different Available in space saving, 8-pin 150-mil SOIC package. 3.3V operation. Advanced 0.35µ CMOS technology. Industrial temperature available. ‘SpreadTrak’. configurations “ASM5P23S04A Configurations Table). The ASM5P23S04A-1 is the base part, where the output frequencies equal the reference if there is no counter in the feedback path. The ASM5P23S04A-1H is the high-drive version of the -1 and the rise and fall times on this device are much faster. The ASM5P23S04A-2 allows the user to obtain Ref and 1/2X frequencies on each output bank. The exact configuration and output frequencies depend on which output drives the feedback pin. The ASM5P23S04A-2H is a high-drive version with REF/2 on both banks. Functional Description ASM5P23S04A is a versatile, 3.3V zero-delay buffer designed to distribute high-speed clocks in PC, workstation, datacom, telecom and other high-performance applications. It is available in a 8-pin package. The part has an on-chip PLL, which locks to an input clock, presented on the REF pin. The PLL feedback is required to be driven to Block Diagram FBK CLKA1 REF PLL CLKA2 /2 Extra Divider (-2) CLKB1 CLKB2 PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018 www.pulsecoresemi.com Notice: The information in this document is subject to change without notice. November 2006 rev 1.4 ASM5P23S04A Configurations Device ASM5P23S04A-1 ASM5P23S04A-1H ASM5P23S04A-2 ASM5P23S04A-2H ASM5P23S04A Feedback From Bank A or Bank B Bank A or Bank B Bank A or Bank B Bank A or Bank B Bank A Frequency Reference Reference Reference Reference Bank B Frequency Reference Reference Reference /2 Reference /2 ‘SpreadTrak’ Many systems being designed now utilize a technology called Spread Spectrum Frequency Timing Generation. ASM5P23S04A is designed so as 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 1500 significant amount of tracking skew which may cause problems in the systems requiring synchronization. Zero Delay and Skew Control For applications requiring zero input-output delay, all outputs must be equally loaded. 1000 REF-Input to CLKA/CLKB Delay (ps) 500 0 -30 -500 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 -1000 -1500 Output Load Difference: FBK Load - CLKA/CLKB Load (pF) REF Input to CLKA/CLKB Delay Vs Difference in Loading between FBK pin and CLKA/CLKB pins To close the feedback loop of the ASM5P23S04A, the FBK pin can be driven from any of the four available output pins. The output driving the FBK pin will be driving a total load of 7pF plus any additional load that it drives. The relative loading of this output (with respect to the remaining outputs) can adjust the input output delay. This is shown in the above graph. For applications requiring zero input-output delay, all outputs including the one providing feedback should be equally loaded. If input-output delay adjustments are required, use the above graph to calculate loading differences between the feedback output and remaining outputs. For zero output-output skew, be sure to load outputs equally. 3.3 ‘SpreadTrak’ Zero Delay Buffer Notice: The information in this document is subject to change without notice. 2 of 15 November 2006 rev 1.4 Pin Configuration REF CLKA1 CLKA2 GND 1 2 3 4 8 FBK ASM5P23S04A ASM5P23S04A 7 6 VDD CLKB2 5 CLKB1 Pin Description for ASM5P23S04A Pin # 1 2 3 4 5 6 7 8 Pin Name REF1 CLKA12 CLKA22 GND CLKB12 CLKB2 2 VDD FBK Description Input reference frequency, 5V tolerant input Buffered clock output, bank A Buffered clock output, bank A Ground Buffered clock output, bank B Buffered clock output, bank B 3.3V supply PLL feedback input Notes: 1. Weak pull-down. 2. Weak pull-down on all outputs. 3.3 ‘SpreadTrak’ Zero Delay Buffer Notice: The information in this document is subject to change without notice. 3 of 15 November 2006 rev 1.4 Absolute Maximum Ratings Parameter Supply Voltage to Ground Potential DC Input Voltage (Except REF) DC Input Voltage (REF) Storage Temperature Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (per MIL-STD-883, Method 3015) ASM5P23S04A Min -0.5 -0.5 -0.5 -65 Max +7.0 VDD + 0.5 7 +150 260 150 Unit V V V °C °C °C >2000 V Note: These are stress ratings only and functional usage is not implied. Exposure to absolute maximum ratings for prolonged periods can affect device reliability. Operating Conditions for ASM5P23S04A Commercial Temperature Devices Parameter VDD TA CL CL CIN Supply Voltage Description Min 3.0 0 Max 3.6 70 30 15 7 Unit V °C pF pF pF Operating Temperature (Ambient Temperature) Load Capacitance, below 100 MHz Load Capacitance, from 100 MHz to 133 MHz Input Capacitance3 Note: 3. Applies to both Ref Clock and FBK. 3.3 ‘SpreadTrak’ Zero Delay Buffer Notice: The information in this document is subject to change without notice. 4 of 15 November 2006 rev 1.4 Electrical Characteristics for ASM5P23S04A Commercial Temperature Devices ASM5P23S04A Parameter VIL VIH IIL IIH Description Input LOW Voltage Input HIGH Voltage Input LOW Current Input HIGH Current VIN = 0V VIN = VDD Test Conditions Min Max 0.8 Unit V V 2.0 50.0 100.0 µA µA VOL Output LOW Voltage 4 IOL = 8mA (-1, -2) IOH = 12mA (-1H, -2H) IOL = -8mA (-1, -2) IOH = -12mA (-1H, -2H) Unloaded outputs 100MHz REF, Select inputs at VDD or GND 0.4 V VOH Output HIGH Voltage 4 2.4 V TBD TBD mA IDD Supply Current Unloaded outputs, 66MHz REF (-1, -2) Unloaded outputs, 33MHz REF (-1, -2) TBD TBD Note: 4. Parameter is guaranteed by design and characterization. Not 100% tested in production. 3.3 ‘SpreadTrak’ Zero Delay Buffer Notice: The information in this document is subject to change without notice. 5 of 15 November 2006 rev 1.4 Switching Characteristics for ASM5P23S04A Commercial Temperature Devices Parameter 1/t1 1/t1 1/t1 ASM5P23S04A Description Output Frequency Output Frequency Output Frequency Duty Cycle = (t2 / t1) * 100 (-1, -2, -1H, -2H) 5 Duty Cycle = (t2 / t1) * 100 (-1, -2,-1H, -2H) 5 Test Conditions 30 pF load, All devices 20 pF load, -1H, -2H devices 15 pF load, -1, -2 devices Measured at 1.4V, FOUT = 66.66 MHz 30 pF load Measured at 1.4V, FOUT =