December 1990 3
Philips Semiconductors Product specification
Dual non-retriggerable monostable
multivibrator with reset
74HC/HCT221
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”
.
PIN DESCRIPTION
PIN NO. SYMBOL NAME AND FUNCTION
1, 9 1
A, 2A trigger inputs (negative-edge triggered)
2, 10 1B, 2B trigger inputs (positive-edge triggered)
3, 11 1
R
D
, 2R
D
direct reset inputs (active LOW)
4, 12 1
Q, 2Q outputs (active LOW)
72R
EXT
/C
EXT
external resistor/capacitor connection
8 GND ground (0 V)
13, 5 1Q, 2Q outputs (active HIGH)
14, 6 1C
EXT
, 2C
EXT
external capacitor connection
15 1R
EXT
/C
EXT
external resistor/capacitor connection
16 V
CC
positive supply voltage
Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.
