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MC74HC161A_13 Datasheet, PDF (8/15 Pages) ON Semiconductor – Presettable Counters
◁
MC74HC161A, MC74HC163A
SWITCHING WAVEFORMS
tr
tf
CLOCK
90%
50%
10%
ANY
90%
50%
OUTPUT 10%
tw
1/fmax
tPLH
tPHL
tTLH
tTHL
Figure 4.
VCC
GND
RESET
tPHL
ANY
OUTPUT
CLOCK
tw
50%
50%
trec
50%
Figure 5.
tr
ENABLE T
90%
50%
10%
tPLH
RIPPLE
CARRY
OUT
90%
50%
10%
tTLH
Figure 6.
tf
VCC
GND
tPHL
tTHL
RESET
tsu
CLOCK
50%
th
50%
Figure 7. HC163A Only
INPUTS
P0, P1,
P2, P3
LOAD
CLOCK
VALID
50%
tsu
th
50%
tsu
th
trec
50%
Figure 8.
VCC
GND
VCC
GND
VCC
GND
ENABLE T
OR
ENABLE P
CLOCK
VALID
50%
tsu
th
50%
Figure 9.
TEST CIRCUIT
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
CL*
VCC
GND
VCC
GND
VCC
GND
VCC
GND
VCC
GND
*Includes all probe and jig capacitance
Figure 10.
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