HD74HC674 - Hitachi Semiconductor

HD74HC674 16-bit Shift Register

The HD74HC674 is a 16-bit parallel-in, serial-out shift register. A three-state input/output (data I/O) port provides access for entering serial data or reading the shift-register word in a recirculating loop. The device has four basic modes of operation: 1. 2. 3. 4. Hold (do nothing) Write (serially via input/output) Read (serially) Load (parallel via data .

Features

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• High Speed Operation: tpd (CLK to SER/Q15) = 17 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Inputs CS H L L L R/W X L H H Mode X X L H CLK X SER/Q15 Z Z Q14n P15 Operation Do nothing Shift and write (serial load) Shift and read Parallel load HD74HC674 Pin Arrangement CS CLK R/W NC Mode SER/Q15 P0 P1 P2 1 2 3 4 5 6 7 8 9 24 VCC 23 P15 22 P14 21 P13 20 P12 19 P11 18 P10 17 P9 16 P8 15 P7 14 P6 13 P5 P3 10 P4 11 G.