HD74HC674 查看數據表（PDF） - Hitachi -> Renesas Electronics

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HD74HC674

16-bit Shift Register

Hitachi -> Renesas Electronics 

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. Hold (do nothing)

2. Write (serially via input/output)

3. Read (serially)

4. 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.

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

R/W

H

X

L

L

L

H

L

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

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