54LS164 Datasheet, PDF (1/6 Pages) National Semiconductor (TI) – 8-Bit Serial In/Parallel Out Shift Registers

June 1989
54LS164 DM54LS164 DM74LS164
8-Bit Serial In Parallel Out Shift Registers
General Description
These 8-bit shift registers feature gated serial inputs and an
asynchronous clear A low logic level at either input inhibits
entry of the new data and resets the first flip-flop to the low
level at the next clock pulse thus providing complete con-
trol over incoming data A high logic level on either input
enables the other input which will then determine the state
of the first flip-flop Data at the serial inputs may be changed
while the clock is high or low but only information meeting
the setup and hold time requirements will be entered Clock-
ing occurs on the low-to-high level transition of the clock
input All inputs are diode-clamped to minimize transmis-
sion-line effects
Features
Y _{Gated (enable disable) serial inputs}
Y _{Fully buffered clock and serial inputs}
Y _{Asynchronous clear}
Y _{Typical clock frequency 36 MHz}
Y _{Typical power dissipation 80 mW}
Y _{Alternate Military Aerospace device (54LS164) is avail-}
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Function Table
Dual-In-Line Package
Inputs
Outputs
Clear Clock A B Q_A Q_B
Q_H
L
X
XX L
L
L
H
L
X X Q_A0 Q_B0
Q_H0
H
u H H H Q_An
Q_Gn
H
u
LX
L
Q_An
Q_Gn
H
u XL
L
Q_An
Q_Gn
H e High Level (steady state) L e Low Level (steady state)
X e Don’t Care (any input including transitions)
u e Transition from low to high level
Q_A0 Q_B0 Q_H0 e The level of Q_A Q_B or Q_H respectively before the
indicated steady-state input conditions were established
u QAn QGn e The level of QA or QG before the most recent transition of
the clock indicates a one-bit shift
TL F 6398 – 1
Order Number 54LS164DMQB 54LS164FMQB
54LS164LMQB DM54LS164J DM54LS164W
DM74LS164M or DM74LS164N
See NS Package Number E20A
J14A M14A N14A or W14B
Logic Diagram
C1995 National Semiconductor Corporation TL F 6398
TL F 6398 – 2
RRD-B30M105 Printed in U S A