Datasheet

January 1995 4
Philips Semiconductors Product specification
Dual precision monostable multivibrator
HEF4538B
MSI
FUNCTION TABLE
Notes
1. H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
X = state is immaterial
= positive output pulse
= negative output pulse
= positive-going transition
= negative-going transition
INPUTS OUTPUTS
I
0
I
1
C
D
O O
LH
HH
XXLLH
Fig.4 Connection of the external timing
components R
t
and C
t
.
DC CHARACTERISTICS
V
SS
=0V
Note
1. Only one monostable is switching: current present during output pulse (output O is HIGH).
V
DD
V
SYMBOL
T
amb
(°C)
− 40 + 25 + 85
TYP. MAX. TYP. MAX. TYP. MAX.
Supply current 5 55 µA
active state 10 I
D
150 µA
(see note) 15 220 µA
Input leakage
current 15 ± I
IN
300 1000 nA
(pins 2 and 14)