cat1024, cat1025 are complete memory and supervisory solutions for microcontroller-based systems. a 2k-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 400khz i2c bus. the cat1025 provides a precision vcc sense circuit and two open drain outputs: one (reset) drives high and the other (reset) drives low whenever vcc falls below the reset threshold voltage. the cat1025 also has a write protect input (wp). write operations are disabled if wp is connected to a logic high. the cat1024 also provides a precision vcc sense circuit, but has only a reset output and does not have a write protect input.
The document describes the CAT1024 and CAT1025 devices from Catalyst Semiconductor. These are complete memory and supervisory solutions for microcontroller-based systems that integrate a 2k-bit serial EEPROM with a system power supervisor and brown-out protection in low-power CMOS technology.
The interface operates via a 400kHz I²C bus. The CAT1025 includes an active high reset output and a Write Protect input, while the CAT1024 provides only an active low reset output. Both devices support five threshold voltage options for 3V, 3.3V, and 5V systems and feature hardware data protection to prevent writes during power-up or brown-out conditions.
| Memory Size | 2k-bit CMOS EEPROM |
|---|---|
| Bus Speed | 400kHz |
| Operating Voltage Range | 3.0V to 5.5V |
| Program/Erase Cycles | 1,000,000 |
| Data Retention | 100 years |
| Package Types | 8-pin DIP, SOIC, TSSOP, MSOP & TDFN (3x3mm) |
Pulling the MR input low generates a Reset condition that remains active for the timeout period after returning to high.
The device supports a PC bus speed of up to 400kHz.
Reset signals typically become inactive 200 ms after the supply voltage exceeds the threshold level.
The TDFN package has a maximum height of 0.8mm.