HD74BC374A Datasheet, PDF (1/9 Pages) Hitachi Semiconductor – Octal D Type Flip Flops With 3 State Outputs

HD74BC374A
Octal D Type Flip Flops With 3 State Outputs
ADE-205-010A(Z)
Rev. 1
March 1993
Description
The HD74BC374A provides high drivability and operation equal to or better than high speed bipolar
standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5
of high speed bipolar logic IC, when the frequency is 10 MHz. The device has eight edge triger D type flip
flop with three state outputs in a 20 pin package. Data at the D inputs meeting set up reguirements, are
transferred to the Q outputs on positive going transitions of the clock input. When the latch enable goes
low, data at the D inputs will be retained at the outputs until latch enable returns high again. When a high
logic level is applied to the output control 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
• Input/Output are at high impedance state when power supply is off.
• Built in input pull up circuit can make input pins be open, when not used.
• TTL level input
• Wide operating temperature range
Ta = –40 to + 85°C
Function Table
Inputs
G
CK
nD
H
X
X
L
L
L
H
L
X
H : High level
L : Low level
X : Immaterial
Z : High impedance
: Low to high transition
Output
nQ
Z
L
H
No change