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LM122 Datasheet Precision Timers

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: LM122 LM322 LM3905 Precision Timers February 1995 LM122 LM322 LM3905 Precision.

General Description

The LM122 series are precision timers that offer great versatility with high accuracy They operate with unregulated supplies from 4 5V to 40V while maintaining constant timing periods from microseconds to hours Internal logic and regulator circuits complement the basic timing function enabling the LM122 series to operate in many different applications 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 driving and signal conditioning where an open collector or emitter 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 1 6V independent of supply voltage but it is fully protected against inputs as high as g 40V even 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 3 15V regulator is included in the timer to reject supply voltage changes and to provide the user with a convenient 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 50 1 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 les

Key Features

  • Y Y Y Y Y Y Y Y Y Y Immune to changes in trigger voltage during timing interval Timing periods from microseconds to hours Internal logic reversal Immune to power supply ripple during the timing interval Operates from 4 5V to 40V supplies Input protected to g 40V Floating transistor output with internal current limiting Internal regulated reference Timing period can be voltage controlled TTL compatible input and output Connection Diagrams Metal Can Package Dual-In-Line Package Dual-In-Line Pac.

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