74HC91 查看數據表（PDF） - Hitachi -> Renesas Electronics

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74HC91

8-bit Shift Register

Hitachi -> Renesas Electronics 

HD74HC91

8-bit Shift Register

Description

This serial-in, serial-out, 8-bit shift register is composed of eight R-S master-slave flip-flops, input gating,

and a clock drive. Single-rail data and input control are gated through inputs A and B and an internal

inverter to form the complementary inputs to the first bit of the shift register. Drive for the internal

common clock line is provided by an inverting clock driver. This clock pulse inverter/driver causes these

circuits to shift information one bit on the positive edge of an input clock pulse.

Features

• High Speed Operation: tpd (Data Word Input to Output) = 21 ns typ (CL = 50 pF)

• High Output Current: Fanout of 10 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

Outputs

tn

A

B

H

H

tn + 8

QH

QH

H

L

L

X

L

H

X

L

L

H

X : Irrelevant

tn : Reference bit time, clock low

tn + 8: Bit time after 8 low-to-high clock transitions

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