PI6C18551 3.3V/5V 1 to 4 Clock Buffer Features Description • • • • • • • PI6C18551 is a low skew, low noise and high-speed clock buffer for computing, networking and communication applications. It is a non-inverting buffer with four outputs from a single input. The outputs are controlled by output enable pin (OE), outputs are tri-states when OE is LOW, and outputs are enabled when OE is HIGH. 160MHz maximum frequency Low skew: 250ps Fast rise/fall time: 1.5ns Output Enable with tri-states Industrial Temperature 3.3V or 5V power supply Packaging (Pb-free & Green available): −8-pin SOIC (W) Pin Description Applications • • • • • • 33MHz for PCI MHz for SDRAM 106.25MHz for Fibre Channel 125MHz for Ethernet 133MHz for PCIX 155.52MHz for OC3/SONET CLK_IN 1 8 OE Y0 2 7 VDD Y1 3 6 GND Y2 4 5 Y3 Logic Block Diagram Y0 Function Table Inputs Y1 Y2 CLK_IN Y3 OE Outputs CLK_IN OE Y[3:0] X L Z L H L H H H Note: 1. X = Don't Care; Z = Tri-state 1 PS8733A 09/27/04 PI6C18551 3.3V/5V 1 to 4 Clock Buffer Pin Description Pin Name Type Pin No Descriptions CLK_IN Input 1 Input clock with pull-up resistor Y0 Output 2 Output clock Y1 Output 3 Output clock Y2 Output 4 Output clock Y3 Output 5 Output clock GND Ground 6 GROUND VDD Power 7 3.3V or 5V power supply OE Input 8 Output Enable with pull-up resistor External Components A minimum number of external components are required for proper operation. A decoupling capacitor of 0.01μF should be connected between VDD on pin 7 and GND on pin 6, as close to the device as possible. A 33Ω series terminating resistor may be used on each clock output if the trace is longer than 1 inch. Absolute Maximun Ratings (Over operating free-air temperature range) Symbol VDD Parameters Min. Supply Voltage Max. Units 7 VI Input Voltage -0.5 VDD+0.5 VO Output Voltage -0.5 VDD+0.5 Ts Storage Temperature -65 150 Ta Ambient Temperature -40 85 Tso Soldering Temperature V °C 260 2 PS8733A 09/27/04 PI6C18551 3.3V/5V 1 to 4 Clock Buffer DC Electrical Characteristics (VDD = 3.3V ±5%, TA = -40 to 85°C) Symbol Parameters Condition VDD 3.3V I/O Supply Voltage VIH Input High Voltage VIL Input Low Voltage VOH Output High Voltage IOH = -25mA VOL Output Low Voltage IOL = 25mA VOH Output High Voltage (CMOS Level) IOH = -12mA IDD Power Supply Current ZO Output Impedance CIN Input Capacitance RPU Internal Pull-up Resistor IOS Short Circuit Current Min. Typ. Max. 3.135 3.465 CLK_IN, Note 1 VDD/2 + 0.7 3.8 OE 2 VDD CLK_IN, Note 1 VDD/2 - 0.7 OE 0.8 No load at 135MHz Units V 2.4 0.4 VDD – 0.4 18 mA 20 Ω CLK_IN TBD OE TBD CLK_IN & OE 120 kΩ ±50 mA pF Notes: 1. Nominal switching threshold is VDD/2 3 PS8733A 09/27/04 PI6C18551 3.3V/5V 1 to 4 Clock Buffer DC Electrical Characteristics (VDD = 5V ±5%, TA = -40 to 85°C) Symbol Parameters Condition VDD 5V I/O Supply Voltage VIH Input High Voltage VIL Input Low Voltage VOH Output High Voltage IOH = -35mA VOL Output Low Voltage IOL = 35mA VOH Output High Voltage (CMOS Level) IOH = -12mA IDD Power Supply Current No load at 135MHz ZO Output Impedance Cin Input Capacitance RPU Internal Pull-up Resistor IOS Short Circuit Current Min. Typ. Max. 4.75 5.25 CLK_IN, Note 1 VDD/2 + 1 5.5 OE 2 VDD CLK_IN, Note 1 VDD/2 - 1 OE 0.8 Units V 2.4 0.4 VDD – 0.4 35 mA 20 Ω CLK_IN TBD OE TBD CLK_IN & OE 77 kΩ ±80 mA pF Notes: 1. Nominal switching threshold is VDD/2 AC Electrical Characteristics (VDD = 3.3±5%, TA = -40 to 85°C) Symbol Parameters Fin Input Frequency Fo Output Frequency Condition Min. Typ. 0 160 load(5) Fo Output Frequency TR Rise Time 0.8V to 2.0V 1.5 TF Fall Time 2.0V to 0.8V 1.5 TPD Propagation Delay TPD Propagation Delay TSK Output Skew 3.3V, 135MHz(2) 5V, 135MHz(2) VDD /2(3) Units 160 3.3V, 15pF load(5) 5V, l5pF Max. MHz 135 2 4 8 1.5 3 6 250 ns ps Notes: 1. With rail to rail input clock. 2. All outputs with equal loading. 3. Duty cycle on outputs will match incoming clock duty cycle. 4. With external series resistor 33Ω positioned close to each output pin. 4 PS8733A 09/27/04 PI6C18551 3.3V/5V 1 to 4 Clock Buffer Packaging Mechcanical: 8-pin SOIC (W) 8 .149 .157 3.78 3.99 .0099 .0196 1 .189 .196 0.25 x 45˚ 0.50 .0075 .0098 0-8˚ 4.80 5.00 .016 .026 0.406 0.660 0.19 0.25 0.40 .016 1.27 .050 .053 .068 1.35 1.75 SEATING PLANE REF .050 BSC 1.27 .2284 .2440 5.80 6.20 .0040 0.10 .0098 0.25 .013 0.330 .020 0.508 X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS Ordering Information: Ordering Code Packaging Code Package Type PI6C18551W W 8-pin SOIC PI6C18551WE W Pb-free & Green, 8-pin SOIC Notes: 1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com 5 PS8733A 09/27/04