September 1993 5
Philips Semiconductors Product speciļ¬cation
Dual retriggerable precision monostable
multivibrator
74HC/HCT4538
handbook, full pagewidth
MBA338
V
ref2
ref1
V
GND
nC
TC
nRC
TC
enable
enable
V
CC
power - on reset
V
CC
nR
D
nA
1
nA
0
nQ
nQ
Fig.7 Logic diagram (V
ref1
and V
ref2
are internal reference voltages).
