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LM2240N データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM2240N データシート(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page 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 |
同様の部品番号 - LM2240N |
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同様の説明 - LM2240N |
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