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SN54ALS190 Datasheet(PDF) 5 Page - Texas Instruments

Part No. SN54ALS190
Description  SYNCHRONOUS 4-BIT UP/DOWN DECADE AND BINARY COUNTERS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SN54ALS191, SN54ALS191
SYNCHRONOUS 4-BIT UP/DOWN DECADE COUNTERS
SDAS210 – D2661, DECEMBER 1982 – REVISED MAY 1986
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
5
typical load, count, and inhibit sequences
7
8
9
0
1
2
2
2
1
0
9
8
RCO
MAX/MIN
QD
QC
QB
QA
7
Count Down
Load
Inhibit
Count Up
Data
Inputs
CTEN
D/U
CLOCK
D
C
B
A
LOAD
’ALS191
Illustrated below is the following sequence:
1. Load (preset) to BCD seven
2. Count up to eight, nine (maximum), zero, one, and two
3. Inhibit
4. Count down to one, zero (minimum), nine, eight, and seven




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