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X4643 Datasheet(PDF) 1 Page - Xicor Inc. |
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X4643 Datasheet(HTML) 1 Page - Xicor Inc. |
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1 / 22 page  REV 1.26 4/30/02 Characteristics subject to change without notice. 1 of 22 www.xicor.com Preliminary Information 64K X4643/5 8K x 8 Bit CPU Supervisor with 64K EEPROM FEATURES • Selectable watchdog timer •Low VCC detection and reset assertion —Four standard reset threshold voltages —Adjust low VCC reset threshold voltage using special programming sequence —Reset signal valid to VCC = 1V • Low power CMOS —<20µA max standby current, watchdog on —<1µA standby current, watchdog off —3mA active current • 64Kbits of EEPROM —64-byte page write mode —Self-timed write cycle —5ms write cycle time (typical) • Built-in inadvertent write protection —Power-up/power-down protection circuitry • 400kHz 2-wire interface • 2.7V to 5.5V power supply operation • Available packages —8-lead SOIC —8-lead TSSOP DESCRIPTION The X4643/5 combines four popular functions, Power-on Reset Control, Watchdog Timer, Supply Voltage Supervision, and Serial EEPROM Memory in one package. This combination lowers system cost, reduces board space requirements, and increases reli- ability. Applying power to the device activates the power on reset circuit which holds RESET/RESET active for a period of time. This allows the power supply and oscilla- tor to stabilize before the processor can execute code. The Watchdog Timer provides an independent protection mechanism for microcontrollers. When the microcon- troller fails to restart a timer within a selectable time out interval, the device activates the RESET/RESET signal. The user selects the interval from three preset values. Once selected, the interval does not change, even after cycling the power. The device’s low VCC detection circuitry protects the user’s system from low voltage conditions, resetting the system when VCC falls below the set minimum VCC trip point. RESET/RESET is asserted until VCC returns to proper operating level and stabilizes. Four industry BLOCK DIAGRAM Watchdog Timer Reset Data Register Command Decode & Control Logic SDA SCL VCC Reset & Watchdog Timebase Power on and Generation VTRIP + - RESET (X4643/5) Reset Low Voltage Status Register Protect Logic EEPROM Array Watchdog Transition Detector WP VCC Threshold Reset Logic RESET (X4645) S0 S1 |
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