X25040

APPLICATION NOTES A V A I L A B L E X25040 4K AN9 AN18 AN31 AN37 AN40 X25040 SPI Serial E2PROM with Block LockTM Protection DESCRIPTION 512 x 8 Bit FEATURES 1MHz Clock Rate SPI Modes (0,0 & 1,1) 512 X 8 Bits —4 Byte Page Mode Low Power CMOS —150µA Standby Current —3mA Active Current 2.7V To 5.5V Power Supply Block Lock Protection —Protect 1/4, 1/2 or all of E2PROM Array Built-in Inadvertent Write Protection —Power-Up/Power-Down protection circuitry —Write Latch —Write Protect Pin Self-Timed Write Cycle —5ms Write Cycle Time (Typical) High Reliability —Endurance: 100,000 cycles per byte —Data Retention: 100 Years —ESD protection: 2000V on all pins 8-Lead PDlP Package 8-Lead SOIC Package The X25040 is a CMOS 4096-bit serial E2PROM, internally organized as 512 x 8. The X25040 features a Serial Peripheral Interface (SPI) and software protocol allowing operation on a simple three-wire bus. The bus signals are a clock input (SCK) plus separate data in (SI) and data out (SO) lines. Access to the device is controlled through a chip select (CS) input, allowing any number of devices to share the same bus. The X25040 also features two additional inputs that provide the end user with added flexibility. By asserting the HOLD input, the X25040 will ignore transitions on its inputs, thus allowing the host to service higher priority interrupts. The WP input can be used as a hardwire input to the X25040 disabling all write attempts, thus providing a mec...