NXP Semiconductors
74HC123; 74HCT123
Dual retriggerable monostable multivibrator with reset
5. Pinning information
5.1 Pinning
74HC123
terminal 1
index area
1B
16 V
CC
15 1REXT/CEXT
14 1CEXT
13 1Q
12 2Q
11 2RD
10 2B
9
001aaa698
74HC123
74HCT123
1A
1B
1RD
1Q
2Q
2CEXT
2REXT/CEXT
GND
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
GND
2A
9
V
CC(1)
16 V
CC
15 1REXT/CEXT
14 1CEXT
13 1Q
12 2Q
11 2RD
10 2B
1RD
1Q
2Q
2CEXT
2REXT/CEXT
1
1A
2A
001aaf046
Transparent top view
(1) The die substrate is attached to this pad using
conductive die attach material. It can not be used as
supply pin or input.
Fig 5.
Pin configuration for DIP16, SO16, SSOP16
and TSSOP16
Fig 6.
Pin configuration for DHVQFN16
5.2 Pin description
Table 2.
Symbol
1A
1B
1RD
1Q
2Q
2CEXT
2REXT/CEXT
GND
2A
2B
2RD
2Q
1Q
1CEXT
1REXT/CEXT
V
CC
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Description
negative-edge triggered input 1
positive-edge triggered input 1
direct reset LOW and positive-edge triggered input 1
active LOW output 1
active HIGH output 2
external capacitor connection 2
external resistor and capacitor connection 2
ground (0 V)
negative-edge triggered input 2
positive-edge triggered input 2
direct reset LOW and positive-edge triggered input 2
active LOW output 2
active HIGH output 1
external capacitor connection 1
external resistor and capacitor connection 1
supply voltage
74HC_HCT123_5
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 13 July 2009
4 of 24
PHILIPS [ NXP SEMICONDUCTORS ]
