CAT1027YI-28-GT3

双电压监控电路，带有I²C串行2K位CMOS EEPROM Dual Voltage Supervisory Circuits with I²C Serial 2k-bit CMOS EEPROM

The CAT1027 is a complete memory and supervisory solution for microcontroller-based systems. A 2 k-bit serial EEPROM memory and a system power supervisor with brown-out protection are integrated together in low power CMOS technology. Memory interface is via a 400 kHz I²C bus.The CAT1027 provides a precision V sense circuit with five reset threshold voltage options that support 5.0 V, 3.3 V and 3.0 V systems. The power 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. pin can be used as an input for push-button manual reset capability.The CAT1027 provides an auxiliary voltage sensor input, V, which is used to monitor a second system supply. The auxiliary high impedance comparator drives the open drain output, V, whenever the sense voltage is below 1.25 V threshold.The CAT1027 is designed with a 1.6 second watchdog timer circuit that resets a system to a known state if software or a hardware glitch halts or "hangs" the system. The CAT1027 features a watchdog timer interrupt input, WDI.The on-chip 2 k-bit EEPROM memory features a 16-byte page. In addition, hardware data protection is provided by a V sense circuit that prevents writes to memory whenever V falls below the reset threshold or until V reaches the reset threshold during power up.Available packages include an 8-pin DIP, 8-pin SOIC, 8-pin TSSOP, 8-pin TDFN and 8-pin MSOP. The TDFN package thickness is 0.8 mm maximum. TDFN footprint is 3x3 mm.

Features

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Precision VCC power supply voltage supervisor

5.0 V, 3.3 V and 3.0 V systems

Five threshold voltage options

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Additional voltage monitoring

— Externally adjustable down to 1.25 V

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Watchdog timer

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Active high or low reset

— Valid reset guaranteed to VCC = 1 V

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400 kHz I²C bus

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3.0 V to 5.5 V operation

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Low power CMOS technology

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16-Byte page write buffer

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Built-in inadvertent write protection

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1,000,000 Program/Erase cycles

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Manual reset capability

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100 year data retention

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8-pin DIP, SOIC, TSSOP, MSOP or TDFN

3 x 3 mm foot-print packages

— TDFN max height is 0.8mm

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Industrial and extended temperature ranges