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SN54AS869 Datasheet(PDF) 7 Page - Texas Instruments

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Part # SN54AS869
Description  SYNCHRONOUS 8-BIT UP/DOWN COUNTERS
PDF  17 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN54AS869 Datasheet(HTML) 7 Page - Texas Instruments

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SN54AS867, SN54AS869
SN74ALS867A, SN74ALS869, SN74AS867, SN74AS869
SYNCHRONOUS 8-BIT UP/DOWN COUNTERS
SDAS115C – DECEMBER 1982 – REVISED JANUARY 1995
7
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
typical clear, preset, count, and inhibit sequences
The following sequence is illustrated below:
1.
Clear outputs to zero (SN74ALS867A and
′AS867 are asynchronous;
SN74ALS869 and
′AS869 are synchronous.)
2.
Preset to binary 252
3.
Count up to 253, 254, 255, 0, 1, and 2
4.
Count down to 1, 0, 255, 254, 253, and 252
5.
Inhibit
C
Async
Clear
D
E
F
CLK
ENP
ENT
QA
QB
QC
QD
RCO
Data
Inputs
Outputs
QE
QF
QG
QH
Count Down
G
H
B
A
S1
S0
Preset
Sync
Clear
252 253
255
254
255 254 253 252
01
21
0
Count Up
Inhibit†
† ENT and ENP both must be low for counting to occur.



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