Low Skew 1 to 2 Clock Buffer 74FC T38072S D ATA S HE E T Description Features The 74FCT38072S is a low skew, single input to two output, Low additive phase jitter RMS: 50fs clock buffer. The 74FCT38072S has best in class additive Extremely low skew outputs (50ps) phase Jitter of sub 50 fsec. Low cost clock buffer Renesas makes many non-PLL and PLL based low skew Packaged in 8-pin SOIC and 8-pin DFN, Pb-free output devices as well as Zero Delay Buffers to synchronize Input/Output clock frequency up to 200 MHz clocks. Contact us for all of your clocking needs. Low power CMOS technology Operating voltages of 1.8V to 3.3V Extended temperature range (-40 to +105C) Block Diagram Q0 ICLK Q1 74FCT38072S May 4, 2020 1 2020 Renesas Electronics Corporation74FCT38072S DATASHEET Pin Assignments VDD 1 8 GND VDD 1 8 GND VDD 2 7 Q1 VDD 2 7 Q1 3 6 ICLK Q0 ICLK 3 6 Q0 GND 4 5 GND GND 4 5 GND 8-pin SOIC 8-pin DFN Pin Descriptions Pin Pin Pin Pin Description 1 Number Name Type 1 VDD Power Connect to +1.8V, +2.5 V, or +3.3 V. 2 VDD Power Connect to +1.8V, +2.5 V, or +3.3 V. 3 ICLK Input Clock input. 4 GND Power Connect to ground. 5 GND Power Connect to ground. 6 Q0 Output Clock output 0. 7 Q1 Output Clock output 1. 8 GND Power Connect to ground. 1.VDD on pin 1 and 2 is the same internal signal and must be connected to the same power rail on the PCB. External Components A minimum number of external components are required for proper operation. A decoupling capacitor of 0.01 F should be connected between VDD pin and GND pin, as close to the device as possible. A 33 series terminating resistor may be used on each clock output if the trace is longer than 1 inch. To achieve the low output skew that the 74FCT38072S is capable of, careful attention must be paid to board layout. Essentially, both outputs must have identical terminations, identical loads and identical trace geometries. If they do not, the output skew will be degraded. For example, using a 30 series termination on one output (with 33 on the others) will cause at least 15 ps of skew. LOW SKEW 1 TO 2 CLOCK BUFFER 2 MAY 4, 2020