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LM2240 fiches techniques PDF

National Semiconductor - Programmable Timer/Counter

Numéro de référence LM2240
Description Programmable Timer/Counter
Fabricant National Semiconductor 
Logo National Semiconductor 





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LM2240 fiche technique
www.DataSheet4U.com
August 1990
LM2240
Programmable Timer Counter
General Description
The LM2240 Programmable Timer Counter is a monolithic
controller capable of both monostable and astable opera-
tion Monostable operation allows accurate microsecond to
five day time delays Long delays up to three years can
easily be generated by cascading two timers The timer con-
sists of a time-base oscillator programmable 8-bit counter
and control flip-flop An external resistor-capacitor (RC) net-
work sets the oscillator frequency and allows delay times
from 1 RC to 255 RC to be selected In the astable mode of
operation a single RC network sets the base frequency
The frequencies of the squarewaves at the 8 outputs are
each at different factors of 2 from the base frequency If 2 or
more of the outputs are shorted together various pulse pat-
terns can be generated These frequencies or pulse pat-
terns can also easily be synchronized to an external signal
The trigger reset and outputs are all TTL and CMOS com-
patible for easy interface with digital systems The timer’s
high accuracy and versatility in producing a wide range of
time delays makes it ideal as a direct replacement for me-
chanical or electromechanical devices
Features
Y Accurate timing from microseconds to days
Y Programmable delays from 1 RC to 255 RC
Y TTL and CMOS compatible outputs
Y Timing directly proportional to RC time constant
Y High accuracy
Y External sync and modulation capability
Y Wide supply voltage range
Y Excellent supply voltage rejection
Connection Diagram
16-Lead Molded DIP
Top View
See NS Package Number N16E
Order Number LM2240N
TL H 10837 – 1
C1995 National Semiconductor Corporation TL H 10837
RRD-B30M115 Printed in U S A

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