CAT1026

CAT1026, CAT1027 Dual Voltage Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM FEATURES Precision VCC Power Supply Voltage Monitor — 5V, 3.3V and 3V systems — Five threshold voltage options Additional voltage monitoring — Externally adjustable down to 1.25V Watchdog timer (CAT1027 only) Active High or Low Reset — Valid reset guaranteed at VCC = 1V 400kHz I2C Bus 2.7V to 5.5V Operation Low power CMOS technology 16-Byte Page Write Buffer Built-in inadvertent write protection 1,000,000 Program/Erase cycles supply monitor and reset circuit protects memory and systems controllers during power up/down and against brownout conditions. If power supply voltages are out of tolerance reset signals become active preventing the system microcontroller, ASIC, or peripherals from operating. The CAT1026 features two open drain reset outputs: ¯¯¯¯¯¯) one (RESET) drives high and the other (RESET drives low whenever VCC falls below the threshold. Reset outputs become inactive typically 200 ms after the supply voltage exceeds the reset threshold value. With both active high and low reset signals, interface to microcontrollers and other ICs is simple. CAT1027 ¯¯¯¯¯¯ output. In addition, the RESET ¯¯¯¯¯¯ pin has only a RESET can be used as an input for push-button manual reset capability. The CAT1026 and CAT1027 provide an auxiliary voltage sensor input, VSENSE, which is used to monitor www.DataSheet4U.com a second system supply. The auxiliary high impeManual Reset capability dance compara...