MM54HCT573 MM74HCT573 TRI-STATE Octal D-Type Latch
MM54HCT574 MM74HCT574 TRI-STATE Octal D-Type Flip-Flop
PRELIMINARY
February 1990
MM54HCT573 MM74HCT573
TRI-STATE Octal D-Type Latch
MM54HCT574 MM74HCT574
TRI-STATE Octal D-Type Flip-Flop
General Description
The MM54HCT573 MM74HCT573 octal D-type latches and
MM54HCT574 MM74HCT574 Octal D-type flip flops ad-
vanced silicon-gate CMOS technology which provides the
inherent benefits of low power consumption and wide power
supply range but are LS-TTL input and output characteristic
pin-out compatible The TRI-STATE outputs are capable
of driving 15 LS-TTL loads All inputs are protected from
damage due to static discharge by internal diodes to V
CC
and ground
When the MM54HCT573 MM74HCT573 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
The MM54HCT574 MM74HCT574 are positive edge trig-
gered flip-flops 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
MM54HCT MM74HCT devices are intended to interface be-
tween TTL and NMOS components and standard CMOS
devices These parts are also plug in replacements for LS-
TTL devices and can be used to reduce power consumption
in existing designs
Features
Y
Y
Y
Y
Y
Y
TTL input characteristic compatible
Typical propagation delay 18 ns
Low input current 1
mA
maximum
Low quiescent current 80
mA
maximum
Compatible with bus-oriented systems
Output drive capability 15 LS-TTL loads
Connection Diagram
Dual-In-Line Package
TL F 10627 鈥?1
Top View
Order Number MM54HCT573 or MM74HCT573
TL F 10627 鈥?2
Top View
Order Number MM54HCT574 or MM74HCT574
Please look into Section 8 Appendix D for availability of various package types
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 10627
RRD-B30M105 Printed in U S A
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