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NE556_98

GENERAL PURPOSE DUAL BIPOLAR TIMERS

STMicroelectronics 

NE556

®

SA556 - SE556

GENERAL PURPOSE DUAL BIPOLAR TIMERS

. LOW TURN OFF TIME

. MAXIMUM OPERATING FREQUENCY

GREATER THAN 500kHz

. TIMING FROM MICROSECONDS TO HOURS

. OPERATES IN BOTH ASTABLE AND

MONOSTABLE MODES

. HIGH OUTPUT CURRENT CAN SOURCE OR

SINK 200mA

. ADJUSTABLE DUTY CYCLE

. TTL COMPATIBLE

. TEMPERATURE STABILITY OF 0.005%

PER oC

N

DIP14

(Plastic Package)

D

SO14

(Plastic Micropackage)

DE S CRI P T IO N

The NE556 dual monolithic timing circuit is a highly

stable controller capable of producing accurate time

delays or oscillation. In the time delay mode of op-

eration, the time is precisely controlled by oneexter-

nal resistor and capacitor. For a stable operation as

an oscillator, the freerunningfrequencyand theduty

cycle are both accurately controlled with two exter-

nal resistors and one capacitor. The circuit may be

triggered and reset on falling waveforms, and the

output structure can source or sink up to 200mA.

ORDER CODES

Part

Number

NE556

SA556

SE556

Temperature

Range

0oC, 70oC

–40oC, 105oC

–55oC, 125oC

Pakcage

N

D

•

•

•

•

•

•

PIN CONNECTIONS (top view)

Discharge 1

Thres hold 2

Control Voltage 3

Reset 4

Output 5

Trigger 6

GND 7

14 VCC

13 Discharge

12 Thres hold

11 Control Voltage

10 Re set

9 Output

8 Trigge r

July 1998

1/9

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