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LM2240N データシート(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM2240N
部品情報  Programmable Timer/Counter
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ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2240N データシート(HTML) 1 Page - National Semiconductor (TI)

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TLH10837
August 1990
LM2240
Programmable TimerCounter
General Description
The LM2240 Programmable TimerCounter 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
TLH10837 – 1
Top View
See NS Package Number N16E
Order Number LM2240N
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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