CD54HC190_15 Datasheet, PDF (9/31 Pages) Texas Instruments – SYNCHORONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL

CD54HC190, CD74HC190
CD54HC191, CD74HC191, CD54HCT191, CD74HCT191
SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL
SCHS275E − MARCH 2002 − REVISED OCTOBER 2003
typical load, count, and inhibit sequence for ’HC191 and ’HCT191
The following sequence is illustrated below:
1. Load (preset) to binary 13
2. Count up to 14, 15 (maximum), 0, 1, and 2
3. Inhibit
4. Count down to 1, 0 (minimum), 15, 14, and 13
LOAD
A
B
Data
Inputs
C
D
CLK
D/U
CTEN
QA
Data
QB
Outputs
QC
QD
MAX/MIN
RCO
H
L
H
L
H
13
14
15 0 1 2
L
2
2
1 0 15 14 13
Count Up
Inhibit
Count Down
Load
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