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X25642S8I Datasheet(PDF) 1 Page - Xicor Inc. |
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X25642S8I Datasheet(HTML) 1 Page - Xicor Inc. |
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1 / 16 page  Advanced SPI Serial E2PROM with Block LockTM Protection 64K 8K x 8 Bit ©Xicor, Inc. 1994, 1995, 1996 Patents Pending 1 Characteristics subject to change without notice 3132-1.0 1/17/97 T5/C0/D1 SH X25642 FEATURES • 2MHz Clock Rate • Low Power CMOS —<1 µA Standby Current —<5mA Active Current • 2.7V To 5.5V Power Supply • SPI Modes (0,0 & 1,1) • 8K X 8 Bits —32 Byte Page Mode • Block Lock Protection —Protect 1/4, 1/2 or all of E2PROM Array • 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 PDIP —8-Lead SOIC —14-Lead SOIC —20-Lead TSSOP DESCRIPTION The X25642 is a CMOS 65,536-bit serial E2PROM, internally organized as 8K x 8. The X25642 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 X25642 also features two additional inputs that provide the end user with added flexibility. By asserting the HOLD input, the X25642 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 X25642 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 X25642 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 8K BYTE ARRAY 64 X 256 Y DECODE DATA REGISTER SO SI SCK CS HOLD WP 64 128 8 32 STATUS REGISTER 64 128 X 256 64 X 256 3132 ILL F01.1 FUNCTIONAL DIAGRAM Direct Write ™ and Block Lock™ Protection is a trademark of Xicor, Inc. APPLICATION NOTE A V A I L A B L E AN19 • AN38 • AN41 • AN61 |
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