Sunnyvale, Calif. - Maxim Integrated Products's MAX16016/20/21/23/24 low-power (< 1.2microamps), microprocessor supervisory circuits feature precision power-supply monitoring and battery-control functions. The circuits are designed to deliver optimal performance in small TQFN or TDFN packages.
Each MAX160XX supervisory circuit device integrates a microprocessor reset circuit, battery-backup switchover, power-fail warning, and chip-enable (CE) gating. The high integration simplifies designs and minimizes the number of components required for power-supply monitoring.
The MAX160XX devices are suitable for a wide variety of applications such as point-of sale (POS) terminals, industrial equipment, fax machines, computers, and set-top boxes.
To protect critical data, the devices automatically switch the real-time clock (RTC) or RAM power source to the backup battery when Vcc falls below the reset threshold and Vbatt. A reset output asserts when Vcc is below the reset-threshold voltage and for at least 145ms after Vcc returns above its threshold.
This reset output prevents code-execution errors during power-up, power-down, and brownout conditions. Each device offers an active-low, push-pull reset or an active-low, open-drain reset. A power-fail comparator signals an interrupt when Vpfi falls below 590mV or when Vcc falls below the reset threshold.
Each MAX160XX supervisory circuit device includes a battery-on output during battery-backup mode; the devices also include a watchdog function that triggers a reset pulse whenever WDI remains high or low for longer than the watchdog-timeout period.
CE signals are internally gated to prevent erroneous data from corrupting the CMOS RAM. There is an integrated low-dropout regulator capable of delivering up to 100mA; a manual-reset input; and a user-adjustable reset input for monitoring a second voltage.
The devices consume only 1.2microamps of quiescent current and operate from as low as 1.53V. Fully specified over the -40 degrees Celsius to +85 degrees Celsius extended temperature range, they are available in 8-/10-pin TDFN or 16-pin TQFN packages.
Pricing starts at $2.48 (1000-up, FOB USA). For more information, go to www.maxim-ic.com.