Supervisors target very-low-voltage components

Supervisors target very-low-voltage components

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Analog Devices has developed a family of highly accurate 4-channel voltage supervisors for increased system voltage margin and enhanced reliability in designs that use supply voltages around 1V. 
By Rich Pell


ASIC, FPGA, DSP, MCU and MPU architectures that operate from supplies as low as 1V cannot use traditional 1%-2% accurate voltage supervisors without shedding valuable system voltage margin and shrinking the remaining load operating voltage range.  The Power by Linear LTC2962-LTC2964 family has a ±0.5% reset threshold accuracy across 1V to 5V, which relaxes power supply demands, increases system tolerance to transients, and enabling a lower nominal supply to dramatically reduce power consumption. 

For each channel, one of 16 preset or adjustable, ±0.5% accurate, voltage thresholds can be easily selected for undervoltage, overvoltage or negative monitoring for four separate supplies.  The supervisory circuits monitor inputs and drive the outputs according to the configured thresholds. 

Alternatively, a manual reset input is also available for optional use of a pushbutton switch to force a system reset.  Ordering options include a watchdog with adjustable timers (LTC2963-1) and individual comparator open-drain outputs for each channel (LTC2964).  An adjustable timeout period is available on all devices. 

The LTC2962 family is available today in multiple temperature grades: 0°C to 70°C (C grade), –40°C to 85°C (I grade), and –40°C to 125°C (H grade).  The LTC2962 is available in a 16-lead 3mm x 3mm QFN, while the LTC2963-1 and LTC2964 are available in a 20-lead 3mm x 4mm QFN, and prices start at $1.98.

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