MC74HC165A Datasheet, PDF (6/9 Pages) ON Semiconductor – 8-Bit Serial or Parallel-Input/Serial-Output Shift Register

MC74HC165A
SWITCHING WAVEFORMS
tr
tf
CLOCK
OR CLOCK INHIBIT
90%
50%
10%
tw
QH OR QH
90%
50%
10%
1/fmax
tPLH
tPHL
tTLH
tTHL
VCC
GND
tw
SERIAL SHIFT/
50%
PARALLEL LOAD
tPLH
QH OR QH
50%
VCC
50%
GND
tPHL
Figure 1. Serial–Shift Mode
Figure 2. Parallel–Load Mode
tr
INPUT H
tPLH
QH OR QH
90%
50%
10%
90%
50%
10%
tTLH
tf
VCC
GND
tPHL
tTHL
Figure 3. Parallel–Load Mode
VALID
VCC
INPUTS A–H
50%
GND
SERIAL SHIFT/
PARALLEL LOAD
tsu
th
VCC
GND
ASYNCHRONOUS PARALLEL
LOAD
(LEVEL SENSITIVE)
Figure 4. Parallel–Load Mode
INPUT SA
CLOCK
OR CLOCK INHIBIT
VALID
SERIAL SHIFT/
VCC
VCC
PARALLEL LOAD
50%
50%
GND
GND
tsu
th
tsu
th
CLOCK
VCC
50%
VCC
OR CLOCK INHIBIT
50%
GND
GND
Figure 5. Serial–Shift Mode
Figure 6. Serial–Shift Mode
CLOCK INHIBIT
CLOCK 2 INHIBITED
VCC
50%
GND
tsu
trec
VCC
CLOCK
50%
GND
Figure 7. Serial–Shift, Clock–Inhibit Mode
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
CL*
* Includes all probe and jig capacitance
Figure 8. Test Circuit
MOTOROLA
6
High–Speed CMOS Logic Data
DL129 — Rev 6