HD74HC194 Datasheet, PDF (7/9 Pages) Hitachi Semiconductor – 4-bit Bidirectional Universal Shift Register

HD74HC194
Waveforms
• Waveform – 1
tn ^tn+1
tr
tf
Clock
50%
tsu th
L or R 50%
50%
tPLH
Q
50%
tn ^tn+1
50%
tsu th
50%
50%
tPHL
50%
Notes : 1. For right shift, measure QA at tn+1, QB at tn+2,
QC at tn+3, QD at tn+4, respectively.
For left shift, measure QA at tn+4, QB at tn+3,
QC at tn+2, QD at tn+1, respectively.
2. Input pulse : PRR ≤ 1 MHz, Zo = 50 Ω, t_r ≤ 6 ns, t_f ≤ 6 ns
• Waveform – 2
t_r
t_f
Clock
10 %
90 %
50 % 50 %
t_w
10 %
t_f
Clear
90 %
50 %
10 %
t_PHL
Q
50 %
10 %
t_THL
Note : 1. Input pulse : PRR ≤ 1 MHz, Zo = 50 Ω, t_r ≤ 6 ns, t_f ≤ 6 ns
V_CC
0V
V_CC
0V
VOH
VOL
V_CC
0V
V_OH
V_OL
V_OH
V_OL
Rev.2.00 Jan 31, 2006 page 7 of 8