New family of supervisory circuits lowers power to extend battery life in mobile applications.

New family of supervisory circuits lowers power to extend battery life in mobile applications.

Analog Devices announces four microprocessor supervisory circuits for monitoring under-voltage conditions in handheld industrial instruments, telecommunications devices, and other portable applications.

Featuring an ultra-low 500-nA supply current that can extend the battery life of mobile devices the ADM6326, ADM6328, ADM6346 and ADM6348 provide a low-power option for the precision monitoring of DSP, ASIC, FPGA and other processor power supplies to detect under-voltage conditions that can lead to system failure. The new ICs monitor 2.5-V, 3-V, 3.3-V and 5-V voltage rails and provide a reset output during power-up, power-down and brownout conditions. On power-up, an internal timer holds reset asserted for at least 100 ms, which effectively holds the microprocessor in a reset state until conditions have stabilized.

The ADM6326 and ADM6346 have an active low push-pull reset output while the ADM6328 and ADM6348 have an active low open-drain output, which requires an external pull-up resistor. The reset output remains operational with VCC as low as 1 V. The reset comparator features built-in glitch immunity, making it impervious to fast transient on VCC. Twenty-four reset threshold voltage options are available, in increments between 2.2 V and 4.63 V, making these devices suitable for monitoring a variety of supplies.

The ADM6326, ADM6328, ADM6346 and ADM6348 are available in a space saving 3-lead SOT-23 package and operate over the extended temperature range of −40°C to +85°C. To request further information or for samples please use the enquiry service below.