SN54AHCT594, SN74AHCT594
8-BIT SHIFT REGISTERS
WITH OUTPUT REGISTERS
SCLS417F – JUNE 1998 – REVISED NOVEMBER 2002
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Inputs Are TTL-Voltage Compatible
8-Bit Serial-In, Parallel-Out Shift
Registers With Storage
Independent Direct Overriding Clears
on Shift and Storage Registers
Independent Clocks for Both Shift and
Storage Registers
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)
description/ordering information
The ’AHCT594 devices contain an 8-bit serial-in,
parallel-out shift register that feeds an 8-bit D-type
storage register. Separate clocks and direct
overriding clear (SRCLR, RCLR) inputs are
provided on both the shift and storage registers.
A serial (Q
H
′
) output is provided for cascading
purposes.
Both the shift register (SRCLK) and storage
register (RCLK) clocks are positive edge
triggered. If both clocks are connected together,
the shift register always is one count pulse ahead
of the storage register.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP – N
Tube
SN74AHCT594N
SN74AHCT594N
SOIC – D
Tube
SN74AHCT594D
AHCT594
–40
°
C to 85
°
C
Tape and reel
SN74AHCT594DR
SOP – NS
Tape and reel
SN74AHCT594NSR
AHCT594
SSOP – DB
Tape and reel
SN74AHCT594DBR
HB594
TSSOP – PW
Tape and reel
SN74AHCT594PWR
HB594
CDIP – J
Tube
SNJ54AHCT594J
SNJ54AHCT594J
–55
°
C to 125
°
C
CFP – W
Tube
SNJ54AHCT594W
SNJ54AHCT594W
LCCC – FK
Tube
SNJ54AHCT594FK
SNJ54AHCT594FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
UNLESS OTHERWISE NOTED this document contains PRODUCTION
specifications per the terms of Texas Instruments standard warranty.
parameters.
Copyright
2002, Texas Instruments Incorporated
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.
SN54AHCT594 . . . J OR W PACKAGE
SN74AHCT594 . . . D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
SN54AHCT594 . . . 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
RCLR
RCLK
SRCLK
SRCLR
Q
H
′
3
2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
SER
RCLR
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
′