74AHC_AHCT123A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 4 — 8 November 2011 5 of 22
NXP Semiconductors
74AHC123A; 74AHCT123A
Dual retriggerable monostable multivibrator with reset
5. Pinning information
5.1 Pinning
5.2 Pin description
(1) The die substrate is attached to this pad using
conductive die attach material. It can not be used as
a supply pin or input.
Fig 5. Pin configuration SO16, TSSOP16 Fig 6. Pin configuration DHVQFN16
74AHC123A
74AHCT123A
1A V
CC
1B 1REXT/CEXT
1RD 1CEXT
1Q 1Q
2Q 2Q
2CEXT 2RD
2REXT/CEXT 2B
GND 2A
001aah068
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
001aah067
74AHC123A
74AHCT123A
2REXT/CEXT 2B
2CEXT 2RD
2Q 2Q
1Q 1Q
1RD 1CEXT
1B 1REXT/CEXT
GND
2A
1A
V
CC
Transparent top view
7 10
6 11
5 12
4
13
3 14
2 15
8
9
1
16
terminal 1
index area
GND
(1)
Table 2. Pin description
Symbol Pin Description
1A
1 negative-edge triggered input 1
1B 2 positive-edge triggered input 1
1R
D 3 direct reset LOW and positive-edge triggered input 1
1Q
4 active LOW output 1
2Q 5 active HIGH output 2
2CEXT 6 external capacitor connection 2
2REXT/CEXT 7 external resistor and capacitor connection 2
GND 8 ground (0 V)
2A
9 negative-edge triggered input 2
2B 10 positive-edge triggered input 2
2R
D 11 direct reset LOW and positive-edge triggered input 2
2Q
12 active LOW output 2
1Q 13 active HIGH output 1
1CEXT 14 external capacitor connection 1
1REXT/CEXT 15 external resistor and capacitor connection 1
V
CC
16 supply voltage
