M74HC390 데이터 시트보기 (PDF) - STMicroelectronics

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M74HC390

Dual decade counter

STMicroelectronics 

M74HC390

1

Pin settings

1.1

Pin connection

Figure 1. Pin connection (top through view)

Pin settings

1.2

Pin description

Table 1. Pin description

Pin N°

Symbol

Name and function

1, 15

1 CLOCK A

2 CLOCK B

Clock input divide by 2 section (HIGH to LOW Edge-Triggered)

2, 14

1 CLEAR

2 CLEAR

Asynchronous master reset inputs

3, 5, 6, 7 1QA to 1QD Flip flop outputs

4, 12

1 CLOCK A

2 CLOCK B

Clock input divide by 5 section (HIGH to LOW Edge-Triggered)

13, 11, 10, 9 2QA to 2QD Flip flop outputs

8

GND Ground (0V)

16

Vcc Positive supply voltage

3/17

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