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LM322 データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM322 データシート(HTML) 1 Page - National Semiconductor (TI) |
1 / 14 page TLH7768 February 1995 LM122LM322LM3905 Precision Timers General Description The LM122 series are precision timers that offer great ver- satility with high accuracy They operate with unregulated supplies from 45V to 40V while maintaining constant timing periods from microseconds to hours Internal logic and reg- ulator circuits complement the basic timing function enabling the LM122 series to operate in many different ap- plications with a minimum of external components The output of the timer is a floating transistor with built in current limiting It can drive either ground referred or supply referred loads up to 40V and 50 mA The floating nature of this output makes it ideal for interfacing lamp or relay driv- ing and signal conditioning where an open collector or emit- ter is required A ‘‘logic reverse’’ circuit can be programmed by the user to make the output transistor either ‘‘on’’ or ‘‘off’’ during the timing period The trigger input to the LM122 series has a threshold of 16V independent of supply voltage but it is fully protected against inputs as high as g40Veven when using a 5V supply The circuitry reacts only to the rising edge of the trigger signal and is immune to any trigger voltage during the timing periods An internal 315V regulator is included in the timer to reject supply voltage changes and to provide the user with a con- venient reference for applications other than a basic timer External loads up to 5 mA can be driven by the regulator An internal 2V divider between the reference and ground sets the timing period to 1 RC The timing period can be voltage controlled by driving this divider with an external source through the VADJ pin Timing ratios of 501 can be easily achieved The comparator used in the LM122 utilizes high gain PNP input transistors to achieve 300 pA typical input bias current over a common mode range of 0V to 3V A boost terminal allows the user to increase comparator operating current for timing periods less than 1 ms This lets the timer operate over a 3 ms to multi-hour timing range with excellent repeat- ability The LM122 operates over a temperature range of b55 Cto a 125 C An electrically identical LM322 is specified from 0 Cto a70 C The LM3905 is identical to the LM122 series except that the boost and VADJ pin options are not avail- able limiting minimum timing period to 1 ms Features Y Immune to changes in trigger voltage during timing interval Y Timing periods from microseconds to hours Y Internal logic reversal Y Immune to power supply ripple during the timing interval Y Operates from 45V to 40V supplies Y Input protected to g40V Y Floating transistor output with internal current limiting Y Internal regulated reference Y Timing period can be voltage controlled Y TTL compatible input and output Connection Diagrams Metal Can Package TLH7768 – 6 Top View Order Number LM122H See NS Package Number H10C Dual-In-Line Package TLH7768 – 7 Top View Order Number LM322N See NS Package Number N14A Dual-In-Line Package TLH7768 – 8 Top View Order Number LM3905N See NS Package Number N08E C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
同様の部品番号 - LM322 |
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同様の説明 - LM322 |
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