SN54HC595, SN74HC595
8-BIT SHIFT REGISTERS
WITH 3-STATE OUTPUT REGISTERS
SCLS041B – DECEMBER 1982 – REVISED MAY 1997
SN54HC595 . . . J OR W PACKAGE
SN74HC595 . . . D OR N PACKAGE
(TOP VIEW)
8-Bit Serial-In, Parallel-Out Shift
High-Current 3-State Outputs Can Drive up
to 15 LSTTL Loads
Shift Register Has Direct Clear
Q
Q
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
B
Q
Package Options Include Plastic
Small-Outline (D) and Ceramic Flat (W)
Packages, Ceramic Chip Carriers (FK), and
Standard Plastic (N) and Ceramic (J)
300-mil DIPs
C
D
A
Q
SER
Q
OE
E
Q
RCLK
SRCLK
SRCLR
F
Q
G
Q
H
description
GND
Q
H′
The ’HC595 contain an 8-bit serial-in, parallel-out
shift register that feeds an 8-bit D-type storage
register. The storage register has parallel 3-state
outputs. Separate clocks are provided for both the
shift and storage register. The shift register has a
direct overriding clear (SRCLR) input, serial
(SER) input, and serial outputs for cascading.
SN54HC595 . . . FK PACKAGE
(TOP VIEW)
3
2
1
20 19
18
SER
OE
Q
4
5
6
7
8
D
Q
17
16
15
14
Both the shift register clock (RCLK) and storage
register clock (SRCLK) are positive-edge trig-
gered. If both clocks are connected together, the
shift register is always one clock pulse ahead of
the storage register.
E
NC
NC
RCLK
SRCLK
Q
F
Q
G
9 10 11 12 13
The SN54HC595 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74HC595 is characterized for
operation from –40°C to 85°C.
NC – No internal connection
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 1997, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
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