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X25165 Dataheets PDF



Part Number X25165
Manufacturers Xicor
Logo Xicor
Description Programmable Watchdog Timer & V CC Supervisory Circuit w/Serial E 2 PROM
Datasheet X25165 DatasheetX25165 Datasheet (PDF)

64K 32K 16K FEATURES X25643/45 X25323/25 X25163/65 DESCRIPTION 8K x 8 Bit 4K x 8 Bit 2K x 8 Bit Programmable Watchdog Timer & VCC Supervisory Circuit w/Serial E2PROM • Programmable Watchdog Timer • Low Vcc Detection and Reset Assertion —Reset Signal Valid to Vcc=1V • Save Critical Data With Block LockTM Protection —Block LockTM Protect 0, 1/4, 1/2 or all of Serial E2PROM Memory Array • In Circuit Programmable ROM Mode • Long Battery Life With Low Power Consumption —<50µA Max Standby Current, .

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64K 32K 16K FEATURES X25643/45 X25323/25 X25163/65 DESCRIPTION 8K x 8 Bit 4K x 8 Bit 2K x 8 Bit Programmable Watchdog Timer & VCC Supervisory Circuit w/Serial E2PROM • Programmable Watchdog Timer • Low Vcc Detection and Reset Assertion —Reset Signal Valid to Vcc=1V • Save Critical Data With Block LockTM Protection —Block LockTM Protect 0, 1/4, 1/2 or all of Serial E2PROM Memory Array • In Circuit Programmable ROM Mode • Long Battery Life With Low Power Consumption —<50µA Max Standby Current, Watchdog On —<1µA Max Standby Current, Watchdog Off —<5mA Max Active Current during Write —<400µA Max Active Current during Read • 1.8V to 3.6V, 2.7V to 5.5V and 4.5V to 5.5V Power Supply Operation • 2MHz Clock Rate • Minimize Programming Time —32 Byte Page Write Mode —Self-Timed Write Cycle —5ms Write Cycle Time (Typical) • SPI Modes (0,0 & 1,1) • Built-in Inadvertent Write Protection —Power-Up/Power-Down Protection Circuitry —Write Enable Latch —Write Protect Pin • High Reliability • Available Packages —14-Lead SOIC (X2564x) —14-Lead TSSOP (X2532x, X2516x) —8-Lead SOIC (X2532x, X2516x) BLOCK DIAGRAM SI SO SCK CS DATA REGISTER COMMAND DECODE & CONTROL LOGIC RESET CONTROL X - DECODE LOGIC These devices combine three popular functions, Watchdog Timer, Supply Voltage Supervision, and Serial E2PROM Memory in one package. This combination lowers system cost, reduces board space requirements, and increases reliability. The Watchdog Timer provides an independent protection mechanism for microcontrollers. During a system failure, the device 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 cycling the power. The user’s system is protected from low voltage conditions by the device’s low Vcc detection circuitry. When Vcc falls below the minimum Vcc trip point, the system is reset. RESET/RESET is asserted until Vcc returns to proper operating levels and stabilizes. The memory portion of the device is a CMOS Serial E2PROM array with Xicor’s Block LockTM Protection. The array is internally organized as x 8. The device features a Serial Peripheral Interface (SPI) and software protocol allowing operation on a simple four-wire bus. The device utilizes Xicor’s proprietary Direct WriteTM cell, providing a minimum endurance of 100,000 cycles per sector and a minimum data retention of 100 years. PAGE DECODE LOGIC 32 SERIAL E2PROM ARRAY 8 RESET/RESET STATUS REGISTER VCC LOW VOLTAGE SENSE WATCHDOG TIMER WP PROGRAMMING, BLOCK LOCK & ICP ROM CONTROL HIGH VOLTAGE CONTROL Characteristics subject to change without notice 7036 FRM 01 ©Xicor, Inc. 1994, 1995, 1996 Patents Pending 7049 -1.0 6/20/97 T0/C0/D0 SH 1 X25643/45 X25323/25 X25163/65 PIN DESCRIPTIONS Serial Output (SO) SO is a push/pull serial data output pin. During a read cycle, data is shifted out on this pin. Data is clocked out by the falling edge of the serial clock. Se.


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