74HC_HCT423

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© NXP B.V. 2011. All rights reserved.

Product data sheet

Rev. 6 — 19 December 2011

4 of 24

NXP Semiconductors

74HC423; 74HCT423

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 a

conductive die attach material. It cannot be used as

supply pin or input

Fig 5.

Pin configuration DIP16, SO16 and (T)SSOP16

Fig 6.

Pin configuration DHVQFN16

74HC423

74HCT423

1A

1B

1REXT/CEXT

1RD

1CEXT

1Q

1Q

2Q

2Q

2CEXT

2RD

2REXT/CEXT

2B

GND

2A

001aah785

1

2

3

4

5

6

7

8

10

9

12

11

14

13

16

15

001aah784

74HC423

74HCT423

2REXT/CEXT

2B

2CEXT

2RD

2Q

2Q

1Q

1Q

1RD

1CEXT

1B

1REXT/CEXT

Transparent top view

7

10

6

11

5

12

4

13

3

14

2

15

terminal 1

index area

Table 2.

Pin description

Symbol

Pin

Description

1A, 2A

1, 9

trigger input (negative edge triggered)

1B, 2B

2, 10

trigger input (positive edge triggered)

1RD, 2RD

3, 11

direct reset (active LOW)

1Q, 2Q

4, 12

output (active LOW)

GND

8

ground (0 V)

1Q, 2Q

13, 5

output (active HIGH)

1CEXT, 2CEXT

14, 6

external capacitor connection

1REXT/CEXT, 2REXT/CEXT

15, 7

external resistor/capacitor connection

16

supply voltage