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X25138S8T2.5 Datasheet(PDF) 1 Page - Xicor Inc. |
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X25138S8T2.5 Datasheet(HTML) 1 Page - Xicor Inc. |
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1 / 18 page  5MHz SPI Serial E2PROM with Block LockTM Protection 128K 16K x 8 Bit ÓXicor, Inc. 1998 Patents Pending 1 Characteristics subject to change without notice 7056–1.5 8/13/98 T2/C0/D1 EW X25138 FEATURES • 5MHz Clock Rate • Low Power CMOS <1 mA Standby Current <5mA Active Current • 2.5V To 5.5V Power Supply • SPI Modes (0,0 & 1,1) • 16K X 8 Bits 32 Byte Page Mode • Block Lock™ Protection Protect 1/4, 1/2 or all of E2PROM Array • Programmable Hardware Write Protection In-Circuit Programmable ROM Mode • Built-in Inadvertent Write Protection Power-Up/Down protection circuitry Write Enable Latch Write Protect Pin • Self-Timed Write Cycle 5ms Write Cycle Time (Typical) • High Reliability Endurance: 100,000 cycles Data Retention: 100 Years ESD protection: 2000V on all pins • Packages 8-Lead XBGA 8, 14-Lead SOIC 8-Lead PDIP 8-Lead TSSOP DESCRIPTION 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 tran- sitions 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 mech- anism for limiting end user capability of altering 0, 1/4, 1/2 or all of the memory. The X25138 utilizes Xicor’s proprietary Direct WriteTM cell, providing a minimum endurance of 100,000 cycles and a minimum data retention of 100 years. COMMAND DECODE AND CONTROL LOGIC WRITE CONTROL AND TIMING LOGIC WRITE PROTECT LOGIC X DECODE LOGIC 16K BYTE ARRAY 128 X 256 Y DECODE DATA REGISTER SO SI SCK CS HOLD WP 128 256 8 32 STATUS REGISTER 128 256 X 256 128 X 256 7037 FRM F01 Direct Write Ô and Block LockÔ Protection is a trademark of Xicor, Inc. FUNCTIONAL DIAGRAM |
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