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Supervisory circuits pack performance in small package

Sunnyvale, Calif. — Maxim Integrated Products introduces the MAX16033- MAX16040 low-power supervisory circuits that provide power supply monitoring and battery control functions in microprocessor systems. Claimed to be the smallest battery-backup ICs, these supervisory circuits save space by integrating a microprocessor reset, backup-battery switchover, power-fail warning, watchdog input, and chip-enable gating into a 2 x 2-mm microDFN package. Applications include point-of-sale equipment, industrial equipment, fax machines, computers, and set-top boxes.

The MAX16033-MAX16040 devices consume only 13 microamps of quiescent current and operate from as low as 1.2 V. Fully specified over the -40°C to +85 °C extended temperature range, they are available in 8- or 10-pin microDFN packages.

The MAX16033-MAX16040 devices automatically switch the RAM to the backup battery when Vcc falls below either the reset threshold or Vbatt. These devices also assert a reset when Vcc is below the reset-threshold voltage for at least 150 ms after Vcc returns above its threshold.

The MAX16033/MAX16037 devices feature a manual-reset input, and the MAX16036/MAX16040 circuits feature an auxiliary user-adjustable reset input for monitoring a second voltage. The MAX16034/MAX16038 parts include a watchdog function that triggers a reset pulse whenever WDI remains high or low for longer than the watchdog timeout period. The MAX16035/MAX16039 devices feature a battery-on output during battery-backup mode. The MAX16033-MAX16036 devices provide internal gating of the chip-enable signals to prevent erroneous data from corrupting the CMOS RAM.

Pricing: Starts at $1.98 (1000-up, FOB USA).
Datasheet: MAX16033-MAX16040

Maxim Integrated Products , 1-800-998-8800, www.maxim-ic.com

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