The MAX16016/MAX16020/MAX16021 supervisory circuits monitor power supplies, provide battery-backup control, and chip-enable (CE) gating to write protect memory in microprocessor (µP)-based systems. These low-power devices improve system reliability by providing several supervisory functions in a small, single integrated solution.
The MAX16016/MAX16020/MAX16021 perform four basic system functions:
Provide a µP reset output during VCC supply power-up, power-down, and brownout conditions.
Control VCC to battery-backup switching internally to maintain data or low-power operation for memories, real-time clocks (RTCs), and other digital logic when the main power is removed.
Provide memory write protection through internal chip-enable gating during brownout.
Provide a combination of additional supervisory functions listed in the Features section in the full data sheet.
The MAX16016/MAX16020/MAX16021 operate from a 1.53V to 5.5V supply voltage and offer fixed reset thresholds for monitoring 5V, 3.3V, 3V, 2.5V, and 1.8V systems. Each device is available with either a push-pull or open-drain reset output.
The MAX16016/MAX16020/MAX16021 are available in small TDFN/TQFN packages and are fully specified for an operating temperature range of -40°C to +85°C.
Key Features
Applications/Uses
System Monitoring for 5V, 3.3V, 3V, 2.5V, or 1.8V Power-Supply Voltages
1.53V to 5.5V Operating Voltage Range
Low 1.2µA Supply Current (0.25µA in Battery-Backup Mode)
145ms (min) Reset Timeout Period
Battery Freshness Seal
On-Board Gating of CE Signals, 1.5ns Propagation Delay (MAX16020/MAX16021)
Debounced Manual Reset Input
Watchdog Timer, 1.2s (typ) Timeout
Power-Fail Comparator and Low-Line Indicator for Monitoring Voltages Down to 0.6V
Battery-On, Battery-OK, and Battery Test Indicators
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