
SN54AHCT595, SN74AHCT595
8-BIT SHIFT REGISTERS
WITH 3-STATE OUTPUT REGISTERS
SCLS374F – MAY 1997 – REVISED JANUARY 2000
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
EPIC
(Enhanced-Performance Implanted
CMOS) Process
Inputs Are TTL-Voltage Compatible
8-Bit Serial-In, Parallel-Out Shift
Shift Register Has Direct Clear
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
Package Options Include Plastic
Small-Outline (D), Shrink Small-Outline
(DB), Thin Shrink Small-Outline (PW), and
Ceramic Flat (W) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) DIPs
description
The ’AHCT595 devices 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
the shift and storage registers. The shift register
has a direct overriding clear (SRCLR) input, serial
(SER) input, and serial outputs for cascading.
When the output-enable (OE) input is high, the
outputs are in the high-impedance state.
Both the shift register clock (RCLK) and storage register clock (SRCLK) are positive-edge triggered. If both
clocks are connected together, the shift register always is one clock pulse ahead of the storage register.
The SN54AHCT595 is characterized for operation over the full military temperature range of –55
°
C to 125
°
C.
The SN74AHCT595 is characterized for operation from –40
°
C to 85
°
C.
Copyright
2000, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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.
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.
EPIC is a trademark of Texas Instruments Incorporated.
SN54AHCT595 . . . J OR W PACKAGE
SN74AHCT595 . . . D, DB, N, OR PW PACKAGE
(TOP VIEW)
SN54AHCT595 . . . FK PACKAGE
(TOP VIEW)
NC – No internal connection
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Q
B
Q
C
Q
D
Q
E
Q
F
Q
G
Q
H
GND
V
CC
Q
A
SER
OE
RCLK
SRCLK
SRCLR
Q
H
′
4
5
6
7
8
18
17
16
15
14
SER
OE
NC
RCLK
SRCLK
Q
D
Q
E
NC
Q
F
Q
G
Q
N
S
H
Q
G
N
C
Q
B
V
C
Q
A
H
Q
′
9 10 11 12 13
3
2
1 20 19