Datasheet

January 1995 5
Philips Semiconductors Product specification
8-bit static shift register
HEF4021B
MSI
AC CHARACTERISTICS
V
SS
= 0 V; T
amb
=25°C; C
L
= 50 pF; input transition times ≤ 20 ns
V
DD
V
SYMBOL MIN. TYP. MAX.
Set-up time 5 25 −15 ns
see also waveforms
Figs 4 and 5
D
S
→ CP 10 t
su
25 −10 ns
15 15 −5ns
55025ns
P
n
→PL 10 t
su
30 10 ns
15 20 5 ns
Hold times 5 40 20 ns
D
S
→ CP 10 t
hold
20 10 ns
15 15 8 ns
515−10 ns
P
n
→ PL 10 t
hold
15 0 ns
15 15 0 ns
Minimum clock 5 70 35 ns
pulse width; LOW 10 t
WCPL
30 15 ns
15 24 12 ns
Minimum PL 5 70 35 ns
pulse width; HIGH 10 t
WPLH
30 15 ns
15 24 12 ns
Recovery time 5 50 10 ns
for PL 10 t
RPL
40 5 ns
15 35 5 ns
Maximum clock 5 6 13 MHz
pulse frequency 10 f
max
15 30 MHz
15 20 40 MHz
V
DD
V
TYPICAL FORMULA FOR P (µW)
Dynamic power 5 900 f
i
+∑(f
o
C
L
) × V
DD
2
where
dissipation per 10 4 300 f
i
+∑(f
o
C
L
) × V
DD
2
f
i
= input freq. (MHz)
package (P) 15 12 000 f
i
+∑(f
o
C
L
) × V
DD
2
f
o
= output freq. (MHz)
C
L
= load capacitance (pF)
∑ (f
o
C
L
) = sum of outputs
V
DD
= supply voltage (V)