NSC JM38510-30605B2, JM38510-30605SD, JM38510-30605SC, JM38510-30605BD, JM38510-30605BC Datasheet
TL/F/6398
54LS164/DM54LS164/DM74LS164 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 control 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. Clocking occurs on the low-to-high level transition of the clock
input. All inputs are diode-clamped to minimize transmission-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 available. Contact a National Semiconductor Sales Office/
Distributor for specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6398– 1
Order Number 54LS164DMQB, 54LS164FMQB,
54LS164LMQB, DM54LS164J, DM54LS164W,
DM74LS164M or DM74LS164N
See NS Package Number E20A,
J14A, M14A, N14A or W14B
Function Table
Inputs Outputs
Clear Clock A B QAQB... Q
H
L X X X L L ... L
HLXXQ
A0QB0
... Q
H0
H
u
HHHQAn... Q
Gn
H
u
LX L QAn... Q
Gn
H
u
XL L QAn... Q
Gn
HeHigh Level (steady state), LeLow Level (steady state)
X
e
Don’t Care (any input, including transitions)
u
e
Transition from low to high level
Q
A0,QB0,QH0
e
The level of QA,QB,orQH, respectively, before the
indicated steady-state input conditions were established.
Q
An,QGn
e
The level of QAor QGbefore the most recentutransition of
the clock; indicates a one-bit shift.
Logic Diagram
TL/F/6398– 2
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
Absolute Maximum Ratings (Note)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range
DM54LS and 54LS
b
55§Ctoa125§C
DM74LS 0
§
Ctoa70§C
Storage Temperature Range
b
65§Ctoa150§C
Note:
The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ tables will define the conditions for actual device operation.
Recommended Operating Conditions
Symbol Parameter
DM54LS164 DM74LS164
Units
Min Nom Max Min Nom Max
V
CC
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
V
IH
High Level Input Voltage 2 2 V
V
IL
Low Level Input Voltage 0.7 0.8 V
I
OH
High Level Output Current
b
0.4
b
0.4 mA
I
OL
Low Level Output Current 4 8 mA
f
CLK
Clock Frequency (Note 4) 0 25 0 25 MHz
t
W
Pulse Width Clock 20 20
ns
(Note 4)
Clear 20 20
t
SU
Data Setup Time (Note 4) 17 17 ns
t
H
Data Hold Time (Note 4) 5 5 ns
t
REL
Clear Release Time (Note 4) 30 30 ns
T
A
Free Air Operating Temperature
b
55 125 0 70
§
C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
Typ
Max Units
(Note 1)
V
I
Input Clamp Voltage V
CC
e
Min, I
I
eb
18 mA
b
1.5 V
V
OH
High Level Output V
CC
e
Min, I
OH
e
Max DM54 2.5 3.4
V
Voltage
V
IL
e
Max, V
IH
e
Min DM74 2.7 3.4
V
OL
Low Level Output V
CC
e
Min, I
OL
e
Max DM54 0.25 0.4
Voltage V
IL
e
Max, V
IH
e
Min
DM74 0.35 0.5 V
I
OL
e
4 mA, V
CC
e
Min DM74 0.25 0.4
I
I
Input Current@Max V
CC
e
Max, V
I
e
7V
0.1 mA
Input Voltage
I
IH
High Level Input Current V
CC
e
Max, V
I
e
2.7V 20 mA
I
IL
Low Level Input Current V
CC
e
Max, V
I
e
0.4V
b
0.4 mA
I
OS
Short Circuit V
CC
e
Max DM54
b
20
b
100
mA
Output Current (Note 2)
DM74
b
20
b
100
I
CC
Supply Current V
CC
e
Max (Note 3) 16 27 mA
Note 1: All typicals are at V
CC
e
5V, T
A
e
25§C.
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 3: I
CC
is measured with all outputs open, the SERIAL input grounded, the CLOCK input at 2.4V, and a momentary ground, then 4.5V, applied to the CLEAR
input.
Note 4: T
A
e
25§C and V
CC
e
5V.
2
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