NE556_98 查看數據表（PDF） - STMicroelectronics

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NE556_98

GENERAL PURPOSE DUAL BIPOLAR TIMERS

STMicroelectronics 

NE556/SA556/SE556

TONE BURST GENERATOR

For a tone burst generator the first timer is used as a monostable and determines the tone duration when

triggered by a positive pulse at pin 6. The second timer is enabled by the high output os the monostable. It

is connected as an astable and determines the frequency of the tone.

Reset 4

Vcc

Rt

Trigge r

Trigge r

6

Discha rge

1

1/2

NE 5 5 6

SE556

2

Thre s hold

C1

Ground

14

5

Output

Control

3

0.01 µF

T = 1.1 R t .C1

MONOSTABLE OPERATION

VC C

RL

RA

4

14

Trigge r

(10)

6 (8)

1/2

NE 55 6

SE556

(13) 1

Output

RL

5 (9)

7

(12)

2

(11)

3

10nF

C

T = 1.1 R A .C

10

Reset

Output

9

14

1/2

NE 55 6

SE556

+15V

RA

Discha rge

13

RB

12 Thre s hold

8 Trigge r

11 C ontrol

Ground 0.01µF

C2

1.44

f=

R A + 2RB ) C

Ground

ASTABLE OPERATION

VCC

RL

RA

4

14

(10)

(13) 1

1/2

O utput

5 (9)

NE 5 5 6

SE556

RB

(12)

RL

(11)

(8) 2

7

3

6

C

0.01nF

Opera ting frequency

1.44

f=

R A + 2RB ) C

t1 = 0.693 (RA + RB) C Output High

t2 = 0.693 RBC Output Low

t2

t1

7/9

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