Datasheet

September 1993 3
Philips Semiconductors Product specification
Dual retriggerable precision monostable
multivibrator
74HC/HCT4538
PIN DESCRIPTION
PIN NO. SYMBOL NAME AND FUNCTION
1, 15 1C
TC
,2C
TC
external capacitor connections
2, 14 1RC
TC
, 2RC
TC
external resistor/capacitor connections
3, 13 1
R
D
,2R
D
direct reset inputs (active LOW)
4, 12 1A
1
,2A
1
trigger inputs (LOW-to-HIGH, edge-triggered)
5, 11 1
A
0
,2A
0
trigger inputs (HIGH-to-LOW, edge-triggered)
6, 10 1Q, 2Q pulse outputs
7, 9 1
Q, 2Q complementary pulse outputs
8 GND ground (0 V)
16 V
CC
positive supply voltage
Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.