MC74HC165A_16 Datasheet, PDF (7/12 Pages) ON Semiconductor – 8-Bit Serial or Parallel-Input/ Serial-Output Shift Register

MC74HC165A
SWITCHING WAVEFORMS
t_r
t_f
CLOCK
90%
V_CC
OR CLOCK INHIBIT
50%
10%
GND
t_w
Q_H OR Q_H
90%
50%
10%
1/f_max
t_PLH
t_PHL
t_TLH
t_THL
Figure 3. Serial−Shirt Mode
SERIAL SHIFT/
PARALLEL LOAD
Q_H OR Q_H
t_w
50%
t_PLH
50%
V_CC
50%
GND
t_PHL
Figure 4. Parallel−Load Mode
t_r
INPUT H
t_PLH
Q_H OR Q_H
90%
50%
10%
90%
50%
10%
t_TLH
t_f
V_CC
GND
t_PHL
t_THL
Figure 5. Parallel−Load Mode
INPUTS A-H
SERIAL SHIFT/
PARALLEL LOAD
VALID
V_CC
50%
GND
t_su
t_h
V_CC
GND
ASYNCHRONOUS PARALLEL
LOAD
(LEVEL SENSITIVE)
Figure 6. Parallel−Load Mode
VALID
SERIAL SHIFT/
V_CC
V_CC
PARALLEL LOAD
50%
INPUT S_A
50%
GND
GND
t_su
t_h
t_su
t_h
CLOCK
V_CC
CLOCK
V_CC
OR CLOCK INHIBIT
50%
OR CLOCK INHIBIT
50%
GND
GND
Figure 7. Serial−Shift Mode
Figure 8. Serial−Shift Mode
CLOCK INHIBIT
CLOCK 2 INHIBITED
V_CC
50%
GND
t_su
t_rec
V_CC
CLOCK
50%
GND
Figure 9. Serial−Shift, Clock−Inhibit Mode
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
C_L*
*Includes all probe and jig capacitance
Figure 10. Test Circuit
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