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CD74HCT191ME4 Scheda tecnica(PDF) 8 Page - Texas Instruments

Il numero della parte CD74HCT191ME4
Spiegazioni elettronici  SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL
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CD74HCT191ME4 Scheda tecnica(HTML) 8 Page - Texas Instruments

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CD54HC190, CD74HC190
CD54HC191, CD74HC191, CD54HCT191, CD74HCT191
SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL
SCHS275E − MARCH 2002 − REVISED OCTOBER 2003
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
typical load, count, and inhibit sequence for ’HC190
The following sequence is illustrated below:
1.
Load (preset) to BCD 7
2.
Count up to 8, 9 (maximum), 0, 1, and 2
3.
Inhibit
4.
Count down to 1, 0 (minimum), 9, 8, and 7
Parallel Load
Preset
Input
Data
P0
P1
P2
P3
Clock
Down/Up
Clock Enable
Q0
Q1
Q2
Q3
Terminal Count
Ripple Clock
Load
H
H
78
90
1
2
2
2
1
0
9
8
7
L
L
L
L
H
H
H
H
H
L
L
L
L
H
Count Up
Inhibit
Count Down


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