X25021 Datasheet (data sheet) PDF





X25021 Datasheet, SPI Serial E2PROM with Block LockTM Protection

X25021   X25021  

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X25021 2K X25021 SPI Serial E2PROM with Block LockTM Protection DESCRIPTION 2 56 x 8 Bit FEATURES • • • • • • • • • • 1MHz Cloc k Rate SPI Modes (0,1 & 1,0) 256 X 8 Bi ts —4 Byte Page Mode Low Power CMOS 10µA Standby Current —3mA Active C urrent 2.7V To 5.5V Power Supply Block Lock Protection —Protect 1/4, 1/2 or all of E2PROM Array Built-in Inadverten t Write Protection —Power-Up/Power-Do wn protection circuitry —Write Latch —Write Protect Pin Self-Timed Write C ycle —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

X25021 Datasheet, SPI Serial E2PROM with Block LockTM Protection

X25021   X25021  
SOIC Package The X25021 is a CMOS 2048- bit serial E2PROM, internally organized as 256 x 8. The X25021 features a Seri al Peripheral Interface (SPI) and softw are protocol allowing operation on a si mple three-wire bus. The bus signals ar e a clock input (SCK) plus separate dat a in (SI) and data out (SO) lines. Acce ss to the device is controlled through a chip select (CS) input, allowing any number of devices to share the same bus . The X25021 also features two addition al inputs that provide the end user wit h added flexibility. By asserting the H OLD input, the X25021 will ignore trans itions on its inputs, thus allowing the host to service higher priority interr upts. The WP input can be used as a har dwire input to the X25021 disabling all write attempts, thus providing a mecha nism for limiting end user capability o f altering the memory. The X25021 utili zes Xicor’s proprietary Direct Write cell, providing a minimum endurance of 100,000 cycles per byte and a minimu m data retention of 100 years. FUNCTIO NAL DIAGRAM STATUS REGISTER WRITE PRO TECT LOGIC X DECODE LOGIC 16 256 BYTE ARRAY 16 X 32 SO SI SCK CS HOLD COMM AND DECODE AND CONTROL LOGIC 16 16 X 3 2 32 32 X 32 WP WRITE CONTROL AND T IMING LOGIC 4 8 Y DECODE DATA REGISTER Direct Write™ and Block Lock™ Protection is a trademar








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