© 2004 Fairchild Semiconductor Corporation DS005906 www.fairchildsemi.com
October 1987
Revised January 2004
MM74C373 • MM74C374 3-STATE Octal D-Type Latch • 3-STATE Octal D-Type Flip-Flop
MM74C373 • MM74C374
3-STATE Octal D-Type Latch •
3-STATE Octal D-Type Flip-Flop
General Description
The MM74C373 and MM74C374 are integrated, comple-
mentary MOS (CMOS), 8-bit storage elements with 3-
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 applied 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 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 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 posi-
tive-going transitions of the CLOCK input.
Both the MM74C373 and the MM74C374 are being assem-
bled in 20-pin dual-in-line packages with 0.300” pin cen-
ters.
Features
■ Wide supply voltage range: 3V to 15V
■ High noise immunity: 0.45 V
CC
(typ.)
■ Low power consumption
■ TTL compatibility:
Fan out of 1driving standard TTL
■ Bus driving capability
■ 3-STATE outputs
■ Eight storage elements in one package
■ Single CLOCK/LATCH
ENABLE and OUTPUT DIS-
ABLE control inputs
■ 20-pin dual-in-line package with 0.300” centers takes
half the board space of a 24-pin package
Ordering Code:
Note 1: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Order Number Package Number Package Description
MM74C373M
(Note 1)
M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
MM74C373N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
MM74C374N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
