HD74BC563A Datasheet, PDF (1/9 Pages) Hitachi Semiconductor – Octal D Type Transparent Latches With 3 State Outputs

HD74BC563A
Octal D Type Transparent Latches With 3 State Outputs
ADE-205-040 (Z)
Rev. 0
June 1993
Description
HD74BC563A 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
Ta = –40 to +85°C.
Function Table
Output Control
Latch Enable
Data
Output Q
L
H
H
L
L
H
L
H
L
L
X
Q₀
H
X
X
Z
H : High level
L : Low level
X : Immaterial
Z : High impedance
Q₀ : Level of Q before the indicated steady state input conditions were established.