Integrated Circuits

74123
Dual retriggerable monostable multivibrator with reset
PDF datasheet
       
1A 1  • 16 Vcc
1B 2 15 1REXT/CEXT
1R D 3 14 1CEXT
1Q 4 13 1Q
2Q 5 12 2Q
2CEXT 6 11 2R D
2REXT/CEXT 7 10 2B
GND 8 9 2A
       
Pin Symbol Description
1 1A negative-edge triggered input 1
2 1B positive-edge triggered input 1
3 1R D direct reset (active low) and positive-edge triggered input 1
4 1Q active low output 1
5 2Q active high output 2
6 2CEXT external capacitor connection 2
7 2REXT/CEXT external resistor and capacitor connection 2
8 GND ground
9 2A negative-edge triggered input 2
10 2B positive-edge triggered input 2
11 2R D direct reset (active low) and positive-edge triggered input 2
12 2Q active low output 2
13 1Q active high output 1
14 1CEXT external capacitor connection 1
15 1REXT/CEXT external resistor and capacitor connection 1
16 Vcc supply voltage


Specifications
(typical values under recommended operating conditions, unless specified)
Parameter Value Unit
Propagation delay, nR D, nA , nB to nQ or nQ 26 (74HC/HCT) ns
Propagation delay, nR D to nQ or nQ 20 (74HC)
23 (74HCT)
ns
Output transition time 7 (74HC/HCT) ns
Retrigger time nA , nB 110 (74HC/HCT) ns
External timing resistor 2 (min)
1000 (max)
k Ω

Note
Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.

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