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HD74HC674 - 16-bit Shift Register

Description

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.

Features

  • 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/.

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Full PDF Text Transcription

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HD74HC674 16-bit Shift Register Description 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 inputs) Low-to-high-level changes at the chip select input should be made only when the clock input is low to prevent false clocking.
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