NE556 查看數據表（PDF） - STMicroelectronics

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NE556

General-purpose dual bipolar timers

STMicroelectronics 

Application information

NE556 - SA556 - SE556

Figure 16. Astable operation

VCC

RL

RA

4

14

(10)

(13) 1

1/2

Output

5 (9)

NE556

SE556

RB

(12)

RL

(11)

(8) 2

7

3

6

C

0.01nF

Operating frequency

1.44

f=

R A + 2RB ) C

t1 = 0.693 (RA + RB) C output high

t2 = 0.693 RBC output low

t2

t1

10/16

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