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X25043P Datasheet(PDF) 1 Page - Xicor Inc. |
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X25043P Datasheet(HTML) 1 Page - Xicor Inc. |
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1 / 15 page  X25043/45 1 DESCRIPTION The X25043/45 combines three popular functions, Watchdog Timer, Voltage Supervision, and E2PROM in a single package. This combination lowers the system cost and reduces the board space requirements. The Watchdog Timer provides an independent protec- tion system for microcontrollers. During a system failure, the X25043/45 watchdog will respond with a RESET/ RESET signal after a selectable time-out interval. The user selects the interval from three preset values. Once selected, the interval does not change, even after cy- cling the power. The system is protected from low voltage conditions by the X25043/45 low VCC detection circuits. When VCC drops below the minimum VCC trip point, the system is reset. Reset is asserted until VCC returns and stabilizes. The memory portion of the X25043/45 is a CMOS 4096- bit serial E2PROM, internally organized as 512 X 8. The X25043/45 features a Serial Peripheral Interface (SPI) and software protocol allowing operation on a simple three-wire bus. The X25043/45 utilizes Xicor’s proprietary Direct Write™ cell, providing a minimum endurance of 100,000 cycles per byte and a minimum data retention of 100 years. 4K X25043/45 512 x 8 Bit ©Xicor, Inc. 1994, 1995, 1996 Patents Pending Characteristics subject to change without notice 3844-6.5 5/9/96 T4/C2/D2 NS Direct Write™ is a trademark of Xicor, Inc. Programmable Watchdog Supervisory E2PROM FEATURES • Programmable Watchdog Timer • Low VCC Detection • Reset Signal Valid to VCC = 1V • 1MHz Clock Rate • 512 X 8 Bits Serial E2PROM —4 Byte Page Mode • Low Power CMOS —50 µA Standby Current —3mA Active Current • 2.7V To 5.5V Power Supply • Block LockTM —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 • High Reliability —Endurance: 100,000 cycles per byte —Data Retention: 100 Years —ESD protection: 2000V on all pins • Available Packages —8-Lead PDlP —8-Lead SOIC —14-Lead TSSOP • X25043 = Active LOW RESET • X25045 = Active HIGH RESET DIE PHOTOGRAPH APPLICATION NOTES A V AILABLE AN11 • AN21 3844 ILL F01 PROGRAMMABLE VOLTAGE SENSOR PROGRAMMABLE VOLTAGE SENSOR RESET CONTROL LOGIC RESET CONTROL LOGIC HIGH VOLTAGE GENERATOR AND CONTROL HIGH VOLTAGE GENERATOR AND CONTROL 4K BITS E2PROM 4K BITS E2PROM W A T C H D O G T I M E R W A T C H D O G T I M E R SERIAL INTERFACE LOGIC SERIAL INTERFACE LOGIC |
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