TL/F/9782
54165/DM74165
8-Bit
Parallel-to-Serial
Converter
August 1989
54165/DM74165
8-Bit Parallel-to-Serial Converter
General Description
The ’165 is an 8-bit parallel load or serial-in register with
complementary outputs available from the last stage. Paral-
lel inputting occurs asynchronously when the Parallel Load
(PL) input is LOW. With PL HIGH, serial shifting occurs on
the rising edge of the clock; new data enters via the Serial
Data (D
S
) input. The 2-input OR clock can be used to com-
bine two independent clock sources, or one input can act as
an active LOW clock enable.
Connection Diagram
Dual-In-Line-Package
TL/F/9782–1
Order Number 54165DMQB, 54165FMQB or DM74165N
See NS Package Number J16A, N16E or W16A
Logic Symbol
TL/F/9782–2
V
CC
e Pin 16
GND e Pin 8
Pin Names Description
CP1, CP2 Clock Pulse Inputs (Active Rising Edge)
D
S
Serial Data Input
PL Asynchronous Parallel Load Input
(Active LOW)
P0–P7 Parallel Data Inputs
Q7 Serial Output from Last Stage
Q7 Complementary Output
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.