
MC74HC597A
http://onsemi.com
8
SWITCHING WAVEFORMS
SERIAL SHIFT/
PARALLEL LOAD
QH
50%
tPLH
50%
VCC
GND
tPHL
50%
tw
*Includes all probe and jig capacitance
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
50%
RESET
QH
SHIFT CLOCK
tPHL
trec
VCC
GND
SERIAL SHIFT/
PARALLEL LOAD
SHIFT CLOCK
50%
tsu
VCC
GND
VCC
GND
tw
LATCH CLOCK
QH
tr
tf
VCC
GND
90%
50%
10%
tPLH
tPHL
tTLH
tTHL
SHIFT CLOCK
QH
VCC
GND
50%
tPLH
tPHL
1/fmax
90%
50%
10%
tw
50%
LATCH CLOCK
VCC
VALID
GND
VCC
GND
tsu
th
50%
PARALLEL DATA
A/H
50%
SHIFT CLOCK
VCC
VALID
GND
VCC
GND
tsu
th
50%
SERIAL DATA
INPUT SA
tw
Figure 3. (Serial Shift/Parallel Load = L)
Figure 4. (Serial Shift/Parallel Load = H)
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10. Test Circuit