Nexperia

HEF4518B

Dual BCD counter

6. Pinning information

6.1. Pinning

HEF4518B

1CP0

VDD

1CP1

2MR

1Q0

2Q3

1Q1

2Q2

1Q2

2Q1

1Q3

2Q0

1MR

2CP1

VSS

2CP0

001aae699

1

2

3

4

5

6

7

8

10

9

12

11

14

13

16

15

Fig. 3. Pin configuration for SOT109-1 (SO16)

6.2. Pin description

Table 2. Pin description

Symbol

Pin

Description

1CP0, 2CP0

1, 9

clock input (LOW-to-HIGH triggered)

1CP1, 2CP1

2, 10

clock input (HIGH-to-LOW triggered)

1Q0, 2Q0

3, 11

output

1Q1, 2Q1

4, 12

output

1Q2, 2Q2

5, 13

output

1Q3, 2Q3

6, 14

output

1MR, 2MR

7, 15

master reset input

VDD

16

supply voltage

VSS

8

ground supply voltage

7. Functional description

Table 3. Function table

H = HIGH voltage level; L = LOW voltage level; X = don’t care; ↑ = positive-going transition; ↓ = negative-going transition.

nCP0

nCP1

nMR

Mode

↑

H

L

counter advances

L

↓

L

counter advances

↓

X

L

no change

X

↑

L

no change

↑

L

L

no change

H

↓

L

no change

X

X

H

nQ0, nQ1, nQ2, nQ3 = LOW

HEF4518B

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© Nexperia B.V. 2021. All rights reserved

Product data sheet

Rev. 9 — 3 December 2021

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