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Description
Precision Timers
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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 50mA.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 of1.6V independent of supply voltage, but it is fully protected against inputs as high as ±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 5mA 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 300pA 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 3μs to multi-hour timing range with excellent repeatability.
The LM122 operates over a temperature range of -55℃ to +125℃. An electrically identical LM322 is specified from 0℃ to + 70℃.The LM3905 is identical to the LM122 series except that the boost and VADJ pin options are not available,limiting minimum timing period to 1 ms.
Features
● 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 ±40V
● Floating transistor output with internal current limiting
● Internal regulated reference
● Timing period can be voltage controlled
● TTL compatible input and output
Preview of the first 3 pages of the data sheet
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10000 buyer reviews from United States
Thomas Turner
Length of registration:7 years
I recently purchased the integrated circuit LM3905N from Utsource and I am very pleased with the product. The circuit was tested and it worked perfectly. The quality of the product was excellent and the delivery was timely. I highly recommend Utsource for their quality products and great customer service.
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03/17/2023
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LM3905N
LM3905N has several brands around the world that may have alternate names for LM3905N due to regional differences or acquisition. LM3905N may also be known as the following names:
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