74AC11590_09 Datasheet, PDF (1/10 Pages) Texas Instruments – 8-BIT BINARY COUNTER WITH REGISTERED 3-STATE OUTPUTS

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• Parallel Registered Outputs
• Internal Counters Have Direct Clear
• Flow-Through Architecture Optimizes
PCB Layout
• Center-Pin V_CC and GND Configurations
Minimize High-Speed Switching Noise
• EPIC (Enhanced-Performance Implanted
CMOS) 1-µm Process
• 500-mA Typical Latch-Up Immunity
at 125°C
• Package Options Include Plastic
Small-Outline Packages and Standard
Plastic 300-mil DIPs
74AC11590
8ĆBIT BINARY COUNTER
WITH REGISTERED 3ĆSTATE OUTPUTS
SCAS194 − D3988, MARCH 1992 − REVISED APRIL 1993
DW OR N PACKAGE
(TOP VIEW)
Q_{B 1}
Q_{C 2}
Q_{D 3}
GND ₄
GND ₅
GND ₆
GND 7
Q_E 8
Q_F 9
Q_G 10
20 ^Q_A
19 ^CCK
18 ^CCKEN
17 ^CCLR
16 ^V_CC
15 ^V_CC
14 OE
13 RCK
12 RCO
11 Q_H
description
The 74AC11590 contains 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 a direct clear (CCLR) input and a count-enable (CCKEN) input. For cascading, a
ripple-carry (RCO) output is provided. Expansion is easily accomplished 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 CCK of the following stage.
Both the register and the counter have individual positive-edge-triggered clocks. If both clocks are connected
together, the counter state is always one count ahead of the register. Internal circuitry prevents clocking from
the clock enable.
The 74AC11590 is characterized for operation from − 40°C to 85°C.
logic symbol^†
14
OE
13
RCK
EN3
C2
18
CCKEN
19
CCK
17
CCLR
CTR8
G1
4
1+ (CT = 255) Z4
CT = 0
2D
3
† _{This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.}
12
RCO
20
QA
1
QB
2
3 ^QC
8 ^QD
9 ^QE
10 ^QF
11 ^QG
QH
EPIC is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright  1993, Texas Instruments Incorporated
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