HD74HCT374 查看數據表（PDF） - Hitachi -> Renesas Electronics

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HD74HCT374

Octal D-type Flip-Flops (with inverted 3-state outputs)

Hitachi -> Renesas Electronics 

HD74HCT374/HD74HCT534

Octal D-type Flip-Flops (with 3-state outputs)/

Octal D-type Flip-Flops (with inverted 3-state outputs)

Description

These device are positive edge triggered flip-flops. The difference between HD74HCT374 and

HD74HCT534 is only that the former is a true outputs and the latter is a false outputs. Data at the D inputs,

meeting the setup and hold time requirements, are transferred to the Q outputs on positive going transitions

of the clock (CK) input. When a high logic level is applied to the output control (OC) input, all outputs go

to a high impedance state, regardless of what signals are present at the other inputs and the state of the

storage elements.

Features

• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility

• High Speed Operation: tpd (Clock to Q) = 15 ns typ (CL = 50 pF)

• High Output Current: Fanout of 15 LSTTL Loads

• Wide Operating Voltage: VCC = 4.5 to 5.5 V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)

Function Table

Output Control Clock

D

L

H

L

L

L

L

X

H

X

X

X : Irrelevant

Z : Off (high-impedance) state of a 3-state output.

HD74HCT374

Q

H

L

No change

Z

HD74HCT534

Q

L

H

No change

Z

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