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NE556_98

GENERAL PURPOSE DUAL BIPOLAR TIMERS

STMicroelectronics 

NE556/SA556/SE556

BLOCK DIAGRAM

VC

+

C

THRES HOLD

CONTROL VOLTAGE

TR IGGE R

RESET

5 kΩ

C O MP

R

FLIP-FLOP

5 kΩ

Q

COMP

S

INHIBIT/

RESET

5 kΩ

S

DISCHARGE

OUT 1/2 NE556

SCHEMATIC DIAGRAM

THRE S HOLD

COMPARATOR

VCC

R1

4. 7kΩ

R2

R3

8 30Ω 4 .7kΩ

CONTROL

VOLTAGE

5

R4 R8

1kΩ 5 kΩ

Q1 9

Q5

Q6

Q7

Q8 Q9

THRE S HOLD

TR IGGER

RES ET

DISC HARGE

G ND

R11

5kΩ

Q1

Q2

Q4

Q3

R9

Q11 Q12 5 kΩ

D2

2

Q1 0

Q13

Q16

4

Q15

7

Q14

1

R5

1 0kΩ

R6

1 00 kΩ

R7

1 0 0kΩ

Q1 7

R1 0

5 kΩ

OUTPUT

R12

6.8k Ω

Q21

Q20

Q22

Ρ13

3.9 kΩ

R17

4.7kΩ

Q2 3

D1

3

R14

220 Ω

Q2 4

Q18

R16 R15

100 Ω 4.7kΩ

TR IGGER COMPARATOR

FLIP FLOP

ABSOLUTE MAXIMUM RATINGS

Symbol

Vcc

Toper

Tj

Tstg

Parameter

Supply Voltage

Operating Free Air Temperature Range

for NE556

for SA556

for SE556

Junction Temperature

Storage Temperature Range

2/9

Value

Unit

18

V

0 to 70

°C

–40 to 105

–55 to 125

150

°C

– 65 to 150

°C

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