5-1
FAST AND LS TTL DATA
SERIAL-IN PARALLEL-OUT
SHIFT REGISTER
The SN54/74LS164 is a high speed 8-Bit Serial-In Parallel-Out Shift Regis-
ter. Serial data is entered through a 2-Input AND gate synchronous with the
LOW to HIGH transition of the clock. The device features an asynchronous
Master Reset which clears the register setting all outputs LOW independent of
the clock. It utilizes the Schottky diode clamped process to achieve high
speeds and is fully compatible with all Motorola TTL products.
• Typical Shift Frequency of 35 MHz
• Asynchronous Master Reset
• Gated Serial Data Input
• Fully Synchronous Data Transfers
• Input Clamp Diodes Limit High Speed Termination Effects
• ESD > 3500 Volts
CONNECTION DIAGRAM DIP (TOP VIEW)
14 13 12 11 10 9
1 2 3 4 5 6
8
7
V
CC
Q
7
Q
6
Q
5
Q
4
MR
CP
A B Q
0
Q
1
Q
2
Q
3
GND
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
PIN NAMES LOADING (Note a)
HIGH
LOW
A, B
CP
MR
Q
0
–Q
7
Data Inputs
Clock (Active HIGH Going Edge) Input
Master Reset (Active LOW) Input
Outputs (Note b)
0.5 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
5 (2.5) U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)
Temperature Ranges.
SN54/74LS164
SERIAL-IN PARALLEL-OUT
SHIFT REGISTER
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 632-08
N SUFFIX
PLASTIC
CASE 646-06
14
1
14
1
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
14
1
D SUFFIX
SOIC
CASE 751A-02
LOGIC SYMBOL
1
2
8
9 3 4 5 6 10 11 12 13
A
B
CP
LS164
8-BIT SHIFT REGISTER
MR Q
0
Q
1
Q
2
Q
3
Q
4
Q
5
Q
6
Q
7
V
CC
= PIN 14
GND = PIN 7
