X25649 Datasheet | Xicor

FEATURES X25648/49, X25328/29, X25168/69 VCC Supervisory Circuit w/Serial E2PROM DESCRIPTION 8K x 8 Bit 4K x 8 Bit 2K x 8 Bit - Low Vcc Detection and Reset Assertion - Reset Signal Valid to Vcc=1V - Save Critical Data With Block Lock TM Protection - Block Lock TM Protect 0, 1/4, 1/2 or all of Serial E2PROM Memory Array - In Circuit Programmable ROM Mode - Long Battery Life With Low Power Consumption - <1µA Max Standby Current - <5m A Max Active Current during Write - <400µA Max Active Current during Read - 1.8V to 3.6V, 2.7V to 5.5V and 4.5V to 5.5V Power Supply Operation - 2MHz Clock Rate - Minimize Programming Time - 32 Byte Page Write Mode - Self-Timed Write Cycle - 5ms Write Cycle Time (Typical) - SPI Modes (0,0 & 1,1) - Built-in Inadvertent Write Protection - Power-Up/Power-Down Protection Circuitry - Write Enable Latch - Write Protect Pin - High Reliability - Available Packages - 14-Lead SOIC (X2564X) - 14-Lead TSSOP (X2532X, X2516X) - 8-Lead SOIC (X2532X, X2516X) BLOCK DIAGRAM SI SO SCK CS DATA REGISTER MAND DECODE & CONTROL LOGIC RESET CONTROL These devices bines two popular functions, Supply Voltage Supervision and Serial E2PROM Memory in one package. This bination lowers system cost, reduces board space requirements, and increases reliability. The user’s system is protected from low voltage conditions by the devices low Vcc detection circuitry. When Vcc falls below the minimum Vcc trip point, the system is reset. RESET/RESET is asserted until Vcc returns to proper operating levels and stabilizes. The memory portion of the device is a CMOS Serial E2PROM array with Xicor’s Block Lock TM Protection. The array is internally organized as x 8. The device features a Serial Peripheral Interface (SPI) and software protocol allowing operation on a simple four-wire bus. The device utilizes Xicor’s proprietary Direct Write TM cell, providing a minimum endurance of 100,000 cycles per sector and a minimum data retention of 100 years. PAGE DECODE LOGIC X - DECODE LOGIC 32 SERIAL...