May 09, 2008

LM 3909 (LED FLASHER OSCILLATOR))

LM 3909 is a monolithic oscillator specifically designed to flash LED's. The device offer high current LED pulse, voltage operation from 1 V to 5 V and low current drain (continuous operation life exceeds estimated battery life).

The package is DIP-8.

ABSOLUTE MAXIMUM RATINGS

PARAMETER

CONDITIONS

SYMBOL

RATING

UNITS

Supply voltage

  

Vs

6.4

V

Internal power dissipation

  

Pdt

500

mW

Operating ambient temperature

  

TA

0… + 70

0C

ELECTRICAL CHRACTERISTICS

Vs=1.4V
TA=25 0C

PARAMETER

CONDITIONS

SYMBOL

Min

Typ

Max

UNITS

Supply voltage

in oscillation

Vs

1.15

  

6

V

Operating current

  

Is

    

.75

mA

Flash frequency

C=300µF 5%

C=0.3µF 5%

f

1

1.1

    

Hz

KHz

Peak LED current

C=350µF

Io

45

    

mA

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