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SCLS417H − JUNE 1998 − REVISED SEPTEMBER 2003
SN54AHCT594 . . . J OR W PACKAGE
SN74AHCT594 . . . D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
D
D
Inputs Are TTL-Voltage Compatible
8-Bit Serial-In, Parallel-Out Shift
Registers With Storage
Q
Q
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
D
D
D
D
Independent Direct Overriding Clears
on Shift and Storage Registers
B
Q
C
D
A
Q
SER
Independent Clocks for Both Shift and
Storage Registers
Q
RCLR
E
Q
12 RCLK
F
Latch-Up Performance Exceeds 100 mA
Per JESD 78, Class II
11
10
9
Q
SRCLK
SRCLR
G
Q
H
ESD Protection Exceeds JESD 22
− 2000-V Human-Body Model (A114-A)
− 200-V Machine Model (A115-A)
GND
Q
H′
− 1000-V Charged-Device Model (C101)
SN54AHCT594 . . . FK PACKAGE
(TOP VIEW)
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.
3
2
1
20 19
18
SER
RCLR
NC
Q
4
5
6
7
8
D
Q
17
16
E
NC
15 RCLK
14
9 10 11 12 13
Q
F
A serial (Q ) output is provided for cascading
H′
SRCLK
Q
G
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.
NC − No internal connection
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP − N
SOIC − D
Tube
SN74AHCT594N
SN74AHCT594N
Tube
SN74AHCT594D
AHCT594
Tape and reel
Tape and reel
Tape and reel
Tube
SN74AHCT594DR
SN74AHCT594NSR
SN74AHCT594DBR
SN74AHCT594PW
SN74AHCT594PWR
SNJ54AHCT594J
SNJ54AHCT594W
SNJ54AHCT594FK
SOP − NS
AHCT594
HB594
−40°C to 85°C
SSOP − DB
TSSOP − PW
HB594
Tape and reel
Tube
CDIP − J
CFP − W
LCCC − FK
SNJ54AHCT594J
SNJ54AHCT594W
SNJ54AHCT594FK
Tube
−55°C to 125°C
Tube
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
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 2003, Texas Instruments Incorporated
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1
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