HD74BC373A Datasheet, PDF (1/9 Pages) Hitachi Semiconductor – Octal D Type Transparent Latches With 3 State Outputs

HD74BC373A
Octal D Type Transparent Latches With 3 State Outputs
ADE-205-009A(Z)
Rev. 1
March 1993
Description
The HD74BC373A 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 D type latches with
three state outputs in a 20 pin package. When the latch enable input is high, the Q outputs will follow the
D inputs. 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 input pins
Ta = –40 to + 85°C
Function Table
Inputs
G
LE
D
H
X
X
L
H
L
L
H
H
L
L
X
H : High level
L : Low level
X : Immaterial
Z : High impedance
Output Q
Z
L
H
No change