X25649

64K 32K 16K 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 LockTM Protection —Block LockTM 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 —<5mA 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 COMMAND DECODE & CONTROL LOGIC RESET CONTROL These devices combines two popular functions, Supply Voltage Supervision and Serial E2PROM Memory in one package. This combination 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 ...