MC74HC161A Datasheet, PDF (7/16 Pages) ON Semiconductor – Presettable Counters

MC74HC161A, MC74HC163A
SWITCHING WAVEFORMS
tr
tf
CLOCK
90%
50%
VCC
10%
GND
ANY
90%
50%
OUTPUT _10%
tw
1/fmax
tPLH tPHL
tTLH
tTHL
Figure 1.
tw
VCC
RESET
50%
GND
tPHL
ANY
OUTPUT
CLOCK
50%
trec
VCC
50%
GND
Figure 2.
tr
ENABLE T
90%
50%
10%
tPLH
RIPPLE
CARRY
OUT
90%
50%
10%
tTLH
Figure 3.
tf
VCC
GND
tPHL
tTHL
RESET
tsu
CLOCK
50%
th
50%
Figure 4. HC163A Only
INPUTS
P0, P1,
P2, P3
LOAD
CLOCK
VALID
50%
tsu
th
50%
tsu
th
trec
50%
Figure 5.
VCC
GND
VCC
ENABLE T
GND
OR
ENABLE P
VALID
50%
tsu
th
VCC
CLOCK
50%
GND
Figure 6.
TEST CIRCUIT
TEST POINT
OUTPUT
DEVICE
UNDER
TEST
CL*
VCC
GND
VCC
GND
VCC
GND
*Includes all probe and jig capacitance
Figure 7.
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