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MAX16021：Low-Power μP Supervisory Circuits with Battery-Backup Circuit and Chip-Enable Gating

Industry's Most Sophisticated Battery-Backup Supervisory Circuits with Chip-Enable Gating and Power-Supply Monitoring

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 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 Small 10-Pin TDFN or 16-Pin TQFN Packages

MAX16016, MAX16020, MAX16021: Typical Application Circuit Applications/Uses GPS Systems Industrial Control Main/Backup Power for RTCs, CMOS Memories Point-of-Sale Equipment Portable/Battery Equipment Set-Top Boxes

DataSheet

Parametrics

Quality and Environmental Data

• MAX16021.pdf

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• MAX16033：Low-Power Battery-Backup Circuits in Small µDFN Packages

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