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| CD74AC191 Datasheet, PDF (8/10 Pages) Texas Instruments – Presettable Synchronous 4-Bit Binary Up/Down Counter | |||
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CD74AC191, CD74ACT191
Pn
INPUT LEVEL
VS
VS
tPHL
tPLH
Qn
VS
VS
FIGURE 3.
PL
VS
tW
tREC
CP
Qn
INPUT LEVEL
INPUT LEVEL
FIGURE 5.
INPUT LEVEL
Pn
tW
PL
VS
INPUT LEVEL
VS
tPLH
tPHL
Qn
VS
VS
FIGURE 4.
Pn
VS
INPUT LEVEL
VS
tSU(H)
tH(H) tSU(L)
tH(L)
INPUT LEVEL
PL
VS
VS
Qn
The shaded areas indicate when the input is permitted to change for
predictable output performance.
FIGURE 6.
U/D
tPLH
TC
tPHL
RC
VS
VS
VS
INPUT LEVEL
VS
tPHL
VS
tPLH
VS
CP
VS
tSU(L)
VS
tH(L)
tSU(H)
VS
INPUT
LEVEL
CE
CE MAY
CHANGE
CE MAY
CHANGE
VS
INPUT
LEVEL
(H-L)
ONLY
FIGURE 7.
OUTPUT
DUT
RL (NOTE)
500â¦
OUTPUT
LOAD
CL
50pF
NOTE: For AC Series Only: When VCC = 1.5V, RL = 1kâ¦.
CD74AC CD74ACT
Input Level
Input Switching Voltage, VS
Output Switching Voltage, VS
VCC
0.5 VCC
0.5 VCC
3V
1.5V
0.5 VCC
FIGURE 9. PROPAGATION DELAY TIMES
FIGURE 8.
8
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