TL/F/5340
MM54HC534/MM74HC534 TRI-STATE Octal D-Type Flip-Flop with Inverted Outputs
January 1988
MM54HC534/MM74HC534
TRI-STATE
É
Octal D-Type Flip-Flop
with Inverted Outputs
General Description
These high speed Octal D-Type Flip-Flops utilize advanced
silicon-gate CMOS technology. They possess the high noise
immunity and low power consumption of standard CMOS
integrated circuits, as well as the ability to drive 15 LS-TTL
loads. Due to the large output drive capability and the TRI-
STATE feature, these devices are ideally suited for interfac-
ing with bus lines in a bus organized system.
These devices are positive edge triggered flip-flops. Data at
the D inputs, meeting the setup and hold time requirements,
are inverted and 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.
The 54HC/74HC logic family is speed, function, and pinout
compatible with the standard 54LS/74LS logic family. All
inputs are protected from damage due to static discharge by
internal diode clamps to V
CC
and ground.
Features
Y
Typical propagation delay: 23 ns
Y
Wide operating voltage range: 2–6V
Y
Low input current: 1 mA maximum
Y
Low quiescent current: 80 mA maximum
Y
Compatible with bus-oriented systems
Y
Output drive capability: 15 LS-TTL loads
Connection Diagram
Dual-In-Line Package
TL/F/5340–1
Top View
Order Number MM54HC534 or MM74HC534
Truth Table
H
e
High Level, L
e
Low Level
Output
Clock Data Output
X
e
Don’t Care
Control
u
e
Transition from low-to-high
L
u
HL
Z
e
High impedance state
L
u
LHQ
0
e
The level of the output before steady state
input conditions were established
LLXQ
0
HXXZ
TRI-STATE
É
is a registered trademark of National Semiconductor Corp.
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
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