ꢀꢁ ꢂꢃ ꢄꢅ ꢂ ꢆꢇ ꢈ ꢉ ꢀꢁꢊ ꢃꢄ ꢅꢂ ꢆꢇ ꢈ
ꢋ ꢌꢍꢎ ꢏ ꢍꢎ ꢁꢈꢐꢑ ꢅ ꢒꢓ ꢁ ꢏꢔ ꢐꢀ
ꢕ ꢎꢏ ꢄ ꢖ ꢌꢀꢏꢈꢏ ꢔ ꢒ ꢓꢏ ꢗꢓꢏ ꢐꢔꢘ ꢎ ꢀ ꢏꢔ ꢐꢀ
SCLS039F − DECEMBER 1982 − REVISED SEPTEMBER 2003
D
D
2-V to 6-V V
Operation
D
D
D
D
6-mA Output Drive at 5 V
Low Input Current of 1 µA Max
8-Bit Counter With Register
Counter Has Direct Clear
CC
High-Current 3-State Parallel Register
Outputs Can Drive Up To 15 LSTTL Loads
D
Low Power Consumption, 80-µA Max I
Typical t = 14 ns
pd
CC
D
SN54HC590A . . . J OR W PACKAGE
SN74HC590A . . . D, DW, OR N PACKAGE
(TOP VIEW)
SN54HC590A . . . FK PACKAGE
(TOP VIEW)
Q
Q
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
B
3
2
1
20 19
18
Q
C
D
A
Q
OE
RCLK
NC
CCKEN
CCLK
4
5
6
7
8
D
Q
OE
Q
17
16
15
14
E
Q
RCLK
E
NC
Q
12 CCKEN
F
Q
F
11
10
9
Q
CCLK
CCLR
RCO
G
Q
G
Q
9 10 11 12 13
H
GND
NC − No internal connection
description/ordering information
The ’HC590A devices contain an 8-bit binary counter that feeds an 8-bit storage register. The storage register
has parallel outputs. Separate clocks are provided for both the binary counter and storage register. The binary
counter features direct clear (CCLR) and count-enable (CCKEN) inputs. A ripple-carry output (RCO) is provided
for cascading. Expansion is accomplished easily for two stages by connecting RCO of the first stage to CCKEN
of the second stage. Cascading for larger count chains can be accomplished by connecting RCO of each stage
to the counter clock (CCLK) input of the following stage.
CCLK and the register clock (RCLK) inputs are positive-edge triggered. If both clocks are connected together,
the counter state always is one count ahead of the register. Internal circuitry prevents clocking from the clock
enable.
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
SN74HC590AN
SN74HC590AD
SN74HC590ADR
SN74HC590ADT
SN74HC590ADW
SN74HC590ADWR
SNJ54HC590AJ
SNJ54HC590AW
SNJ54HC590AFK
SN74HC590AN
HC590A
−40°C to 85°C
SOIC − DW
HC590A
CDIP − J
CFP − W
LCCC - FK
SNJ54HC590AJ
SNJ54HC590AW
SNJ54HC590AFK
−55°C to 125°C
†
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.
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Copyright 2003, Texas Instruments Incorporated
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