MM54C373 MM74C373 TRI-STATE Octal D-Type Latch
MM54C374 MM74C374 TRI-STATE Octal D-Type Flip-Flop
March 1988
MM54C373 MM74C373 TRI-STATE Octal D-Type Latch
MM54C374 MM74C374 TRI-STATE Octal D-Type Flip-Flop
General Description
The MM54C373 MM74C373 MM54C374 MM74C374 are
integrated complementary MOS (CMOS) 8-bit storage ele-
ments with TRI-STATE outputs These outputs have been
specially designed to drive high capacitive loads such as
one might find when driving a bus and to have a fan out of 1
when driving standard TTL When a high logic level is ap-
plied to the OUTPUT DISABLE 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 MM54C373 MM74C373 is an 8-bit latch When LATCH
ENABLE is high the Q outputs will follow the D inputs
When LATCH ENABLE goes low data at the D inputs
which meets the set-up and hold time requirements will be
retained at the outputs until LATCH ENABLE returns high
again
The MM54C374 MM74C374 is an 8-bit D-type positive-
edge triggered flip-flop Data at the D inputs meeting the
set-up and hold time requirements is transferred to the Q
outputs on positive-going transitions of the CLOCK input
Both the MM54C373 MM74C373 and the MM54C374
MM74C374 are being assembled in 20-pin dual-in-line pack-
ages with 0 300 pin centers
Features
Y
Y
Y
Y
Wide supply voltage range
High noise immunity
Low power consumption
TTL compatibility
3V to 15V
0 45 V
CC
(typ )
Fan out of 1
driving standard TTL
Y
Y
Y
Y
Y
Bus driving capability
TRI-STATE outputs
Eight storage elements in one package
Single CLOCK LATCH ENABLE and OUTPUT
DISABLE control inputs
20-pin dual-in-line package with 0 300 centers takes
half the board space of a 24-pin package
Connection Diagrams
MM54C373 MM74C373
Dual-In-Line Package
MM54C374 MM74C374
Dual-In-Line Package
TL F 5906 鈥?1
TL F 5906 鈥?2
Top View
Order Number MM54C373 or MM74C373
Top View
Order Number MM54C374 or MM74C374
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 5906
RRD-B30M105 Printed in U S A
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