HD74HCT374 Datasheet, PDF (1/10 Pages) Hitachi Semiconductor – Octal D-type Flip-Flops(with inverted 3-state outputs)

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: t_pd (Clock to Q) = 15 ns typ (C_L = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: V_CC = 4.5 to 5.5 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: I_CC (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