X25138

Temperature under Bias..................65°C to +135°C
Storage Temperature .....................65°C to +150°C
Voltage on any Pin with Respect
to V_SS .........................................................1V to +7V
D.C. Output Current ............................................... 5mA
        (Soldering, 10 seconds) ..............................300°C

Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.This is a stress rating only and the functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.

The X25138 is a CMOS 128K-bit serial E²PROM,internally organized as 16K x 8. The X25138 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 X25138 also features two additional inputs that provide the end user with added flexibility. By asserting the HOLD input, the X25138 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 X25138 disabling all write attempts to the status register, thus providing a mechanism for limiting end user capability of altering 0, 1/4,1/2 or all of the memory.

The X25138 utilizes Xicor's proprietary Direct Write^TM cell, providing a minimum endurance of 100,000 cycles and a minimum data retention of 100 years.