C0083C0078C0053C0052C0072C0067C0053C0057C0048C0065C0044 C0083C0078C0055C0052C0072C0067C0053C0057C0048C0065
C0056C0262C0066C0073C0084 C0066C0073C0078C0065C0082C0089 C0067C0079C0085C0078C0084C0069C0082C0083
C0087C0073C0084C0072 C0051C0262C0083C0084C0065C0084C0069 C0079C0085C0084C0080C0085C0084 C0082C0069C0071C0073C0083C0084C0069C0082C0083
SCLS039F − DECEMBER 1982 − REVISED SEPTEMBER 2003
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
C0068 2-V to 6-V V
CC
Operation
C0068 High-Current 3-State Parallel Register
Outputs Can Drive Up To 15 LSTTL Loads
C0068 Low Power Consumption, 80-µA Max I
CC
C0068 Typical t
pd
= 14 ns
C0068 ±6-mA Output Drive at 5 V
C0068 Low Input Current of 1 µA Max
C0068 8-Bit Counter With Register
C0068 Counter Has Direct Clear

SN54HC590A ...J OR W PACKAGE
SN74HC590A . . . D, DW, OR N PACKAGE
(TOP VIEW)
SN54HC590A . . . 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
OE
RCLK
CCKEN
CCLK
CCLR
RCO
3212019
91011 1213
4
5
6
7
8
18
17
16
15
14
OE
RCLK
NC
CCKEN
CCLK
Q
D
Q
E
NC
Q
F
Q
G
Q NC
RCO
CCLR
H
GND
NC
C
Q
B
V
CC
Q
A
Q
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
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N Tube of 25 SN74HC590AN SN74HC590AN
Tube of 40 SN74HC590AD
−40°C to 85°C
SOIC − D
Reel of 2500 SN74HC590ADR
HC590A
Reel of 250 SN74HC590ADT
SOIC − DW
Tube of 40 SN74HC590ADW
HC590A
Reel of 2000 SN74HC590ADWR
CDIP − J Tube of 25 SNJ54HC590AJ SNJ54HC590AJ
−55°C to 125°C CFP − W Tube of 150 SNJ54HC590AW SNJ54HC590AW
LCCC - FK Tube of 55 SNJ54HC590AFK SNJ54HC590AFK
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
Copyright  2003, Texas Instruments IncorporatedC0080C0082C0079C0068C0085C0067C0084C0073C0079C0078 C0068C0065C0084C0065 C0105C0110C0102C0111C0114C0109C0097C0116C0105C0111C0110 C0105C0115 C0099C0117C0114C0114C0101C0110C0116 C0097C0115 C0111C0102 C0112C0117C0098C0108C0105C0099C0097C0116C0105C0111C0110 C0100C0097C0116C0101C0046
C0080C0114C0111C0100C0117C0099C0116C0115 C0099C0111C0110C0102C0111C0114C0109 C0116C0111 C0115C0112C0101C0099C0105C0102C0105C0099C0097C0116C0105C0111C0110C0115 C0112C0101C0114 C0116C0104C0101 C0116C0101C0114C0109C0115 C0111C0102 C0084C0101C0120C0097C0115 C0073C0110C0115C0116C0114C0117C0109C0101C0110C0116C0115
C0115C0116C0097C0110C0100C0097C0114C0100 C0119C0097C0114C0114C0097C0110C0116C0121C0046 C0080C0114C0111C0100C0117C0099C0116C0105C0111C0110 C0112C0114C0111C0099C0101C0115C0115C0105C0110C0103 C0100C0111C0101C0115 C0110C0111C0116 C0110C0101C0099C0101C0115C0115C0097C0114C0105C0108C0121 C0105C0110C0099C0108C0117C0100C0101
C0116C0101C0115C0116C0105C0110C0103 C0111C0102 C0097C0108C0108 C0112C0097C0114C0097C0109C0101C0116C0101C0114C0115C0046
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.
C0079C0110 C0112C0114C0111C0100C0117C0099C0116C0115 C0099C0111C0109C0112C0108C0105C0097C0110C0116 C0116C0111 C0077C0073C0076C0262C0080C0082C0070C0262C0051C0056C0053C0051C0053C0044 C0097C0108C0108 C0112C0097C0114C0097C0109C0101C0116C0101C0114C0115 C0097C0114C0101 C0116C0101C0115C0116C0101C0100
C0117C0110C0108C0101C0115C0115 C0111C0116C0104C0101C0114C0119C0105C0115C0101 C0110C0111C0116C0101C0100C0046 C0079C0110 C0097C0108C0108 C0111C0116C0104C0101C0114 C0112C0114C0111C0100C0117C0099C0116C0115C0044 C0112C0114C0111C0100C0117C0099C0116C0105C0111C0110
C0112C0114C0111C0099C0101C0115C0115C0105C0110C0103 C0100C0111C0101C0115 C0110C0111C0116 C0110C0101C0099C0101C0115C0115C0097C0114C0105C0108C0121 C0105C0110C0099C0108C0117C0100C0101 C0116C0101C0115C0116C0105C0110C0103 C0111C0102 C0097C0108C0108 C0112C0097C0114C0097C0109C0101C0116C0101C0114C0115C0046