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DM74LS373N Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DM74LS373N
Description  TRI-STATEE Octal D-Type Transparent Latches and Edge-Triggered Flip-Flops
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM74LS373N Datasheet(HTML) 2 Page - National Semiconductor (TI)

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General Description (Continued)
The eight latches of the DM5474LS373 are transparent D-
type latches meaning that while the enable (G) is high the Q
outputs will follow the data (D) inputs When the enable is
taken low the output will be latched at the level of the data
that was set up
The eight flip-flops of the DM5474LS374 are edge-trig-
gered D-type flip flops On the positive transition of the
clock the Q outputs will be set to the logic states that were
set up at the D inputs
A buffered output control input can be used to place the
eight outputs in either a normal logic state (high or low logic
levels) or a high-impedance state In the high-impedance
state the outputs neither load nor drive the bus lines signifi-
cantly
The output control does not affect the internal operation of
the latches or flip-flops That is the old data can be retained
or new data can be entered even while the outputs are off
Function Tables
DM5474LS373
Output
Enable
D
Output
Control
G
LH
H
H
LH
L
L
LL
X
Q0
HX
X
Z
DM5474LS374
Output
Clock
D
Output
Control
L
u
HH
L
u
LL
LL
X
Q0
HX
X
Z
H e High Level (Steady State) L e Low Level (Steady State) X e Don’t Care
u e Transition from low-to-high level Z e High Impedance State
Q0 e The level of the output before steady-state input conditions were established
Logic Diagrams
DM5474LS373
Transparent Latches
TLF6431 – 3
DM5474LS374
Positive-Edge-Triggered Flip-Flops
TLF6431 – 4
2


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