This document describes the features and characteristics of a VCC supervisory circuit with serial E2PROM memory. It includes low Vcc detection and reset assertion, Block LockTM protection, in-circuit programmable ROM mode, low power consumption, multiple power supply operation ranges, fast programming time, SPI modes, and write protection.
The document describes the Xicor X25648/49, a device combining supply voltage supervision and serial EEPROM memory in one package. It features low Vcc detection to reset the system if voltage drops below 1V, ensuring data integrity during power failures.
The memory array is organized as 64K x 8 bits (for X25648/49) or smaller variants depending on the model suffix. Key features include Block Lock™ protection for sectors of the memory, an in-circuit programmable ROM mode, and low power consumption with standby current under 1µA.
| Memory Capacity (X25648/49) | 64K x 8 Bit |
|---|---|
| Memory Capacity (X25328/29) | 32K x 8 Bit |
| Memory Capacity (X25168/69) | 16K x 8 Bit |
| Minimum Endurance | 100,000 cycles per sector |
| Data Retention | 100 years |
| Clock Rate | 2MHz |
| Write Cycle Time (Typical) | 5ms |
| Standby Current | <1µA Max |
The device asserts the reset signal when Vcc falls below 1V.
Block Lock™ protects specific portions of the memory array (0, 1/4, 1/2 or all) from being written to.
The maximum active current during a write cycle is less than 5mA.