View max6400 datasheet:

19-2043; Rev 1; 8/01 µP Supervisory Circuits in 4-Bump (2 ? 2) Chip-Scale Package General Description ____________________________Features The MAX6400–MAX6405 is a family of ultra-low power ¦ Ultra-Small 4-Bump (2 ? 2) Chip-Scale Package, microprocessor (µP) supervisory circuits used for moni- (Package Pending Full Qualification—Expected toring battery, power-supply, and regulated system Completion Date 6/30/01. See UCSP Reliability voltages. Each device contains a precision bandgap Section for More Details.) reference comparator and is trimmed to specified trip ¦ 70% Smaller Than SC70 Package threshold voltages. These devices provide excellent cir- ¦ Ultra-Low 500nA (typ) Supply Current cuit reliability and low cost by eliminating external com- (MAX6400/MAX6401/MAX6402) po