HCF4021 Datasheet, PDF (7/13 Pages) STMicroelectronics – Asynchronous parallel input or synchronous serial-in/serial-out 8-stage static shift register

HCF4021
Electrical characteristics
Table 7. Dynamic electrical characteristics (T_amb = 25 °C, C_L = 50 pF, R_L = 200 k, t_r =
t_f = 20 ns)
Test condition
Value⁽¹⁾
Unit
Symbol
Parameter
V_DD (V)
Min. Typ. Max.
5
160 320
t_PLH, t_PHL Propagation delay time
10
80 160
15
60 120
ns
5
100 200
t_THL, t_TLH Transition time
10
50 100
15
40
80
5
3
6
f_CL(2) Maximum clock input frequency
10
6
12
15
8.5
17
MHz
5
180 90
t_w
Clock pulse width
10
80
40
ns
15
50
25
5
t_r , t_f
Clock input rise or fall time
10
15
15
s
Minimum setup time, serial input
5
t_H  200 ns
10
(ref to CL)
15
t_s
Minimum setup time, parallel
5
inputs
t_H  200 ns
10
(ref to P/S)
15
120 60
80
40
60
30
50
25
30
15
20
10
5
t_h
Hold time, serial in, parallel in,
parallel/serial control
10
0
ns
15
5
160 80
t_WH
P/S pulse width
10
80
40
15
50
25
t_rem
P/S removal time
ref to CL)
5
280 140
10
140 70
15
100 50
1. The typical temperature coefficient for all V_DD values is 0.3 %/°C.
2. If more than one unit is cascaded, t_rCL should be made less than or equal to the sum of the transition time
and the fixed propagation delay of the output of the driving stage of the estimated capacitive load.
DocID008216 Rev 3
7/13
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