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SCLS040F − DECEMBER 1982 − REVISED OCTOBER 2003
D
D
Wide Operating Voltage Range of 2 V to 6 V
D
D
Low Input Current of 1 µA Max
8-Bit Serial-In, Parallel-Out Shift Registers
With Storage
High-Current Outputs Can Drive Up To
15 LSTTL Loads
D
D
D
Low Power Consumption, 80-µA Max I
Typical t = 15 ns
pd
6-mA Output Drive at 5 V
D
D
Independent Direct Overriding Clears on
Shift and Storage Registers
CC
Independent Clocks for Both Shift and
Storage Registers
SN54HC594 . . . J OR W PACKAGE
SN74HC594 . . . D, DW, OR N PACKAGE
(TOP VIEW)
SN54HC594 . . . FK PACKAGE
(TOP VIEW)
Q
Q
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
B
Q
3
2
1
20 19
18
C
D
A
SER
RCLR
NC
Q
4
5
6
7
8
D
Q
SER
Q
17
16
15
E
Q
RCLR
RCLK
SRCLK
SRCLR
E
NC
Q
F
RCLK
Q
F
Q
G
14 SRCLK
9 10 11 12 13
Q
G
Q
H
GND
Q
H′
NC − No internal connection
description/ordering information
The ’HC594 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 (RCLR, SRCLR) inputs are provided on both the shift and
storage registers. A serial (Q ) output is provided for cascading purposes.
H′
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.
The parallel (Q −Q ) outputs have high-current capability. Q is a standard output.
A
H
H′
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP − N
SOIC − D
Tube of 25
Tube of 40
Reel of 2500
Reel of 250
Tube of 40
Reel of 2000
Tube of 25
Tube of 150
Tube of 55
SN74HC594N
SN74HC594N
SN74HC594D
SN74HC594DR
SN74HC594DT
SN74HC594DW
SN74HC594DWR
SNJ54HC594J
SNJ54HC594W
SNJ54HC594FK
HC594
−40°C to 85°C
−55°C to 125°C
SOIC − DW
HC594
CDIP − J
CFP − W
LCCC − FK
SNJ54HC594J
SNJ54HC594W
SNJ54HC594FK
†
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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