CD54HC190_15 Datasheet, PDF (10/31 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
Direction
Control
Enable
D/U
CE
CP TC
D/U
CE
CP TC
D/U
CE
CP TC
Clock
Figure 1. ’HC190 Synchronous n-Stage Counter With Parallel Gated Terminal Count
Direction
Control
Enable
D/U ^RC
CE
CP
D/U RC
CE
CP
D/U RC
CE
CP
Clock
Figure 2. ’HC191, ’HCT191 Synchronous n-Stage Counter With Parallel Gated Terminal Count
0
1
2
3
4
0
1
2
3
4
15
5
15
5
14
6
14
6
13
7
13
7
12
11
10
9
8
12
11
10
9
8
Count Up
NOTE: Illegal states in BCD counters corrected in one count
Count Down
NOTE: Illegal states in BCD counters corrected in one or two counts
Figure 3. ’HC190 State Diagram
10
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