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X40421V14I-B Datasheet(PDF) 1 Page - Xicor Inc. |
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X40421V14I-B Datasheet(HTML) 1 Page - Xicor Inc. |
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1 / 25 page  REV 1.2.14 7/12/02 Characteristics subject to change without notice. 1 of 25 www.xicor.com 4kbit EEPROM X40420/X40421 Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch FEATURES • Dual voltage detection and reset assertion —Three standard reset threshold settings (4.6V/2.9V, 4.6V/2.6V, 2.9V/1.6V) —VTRIP2 Programmable down to 0.9V —Adjust low voltage reset threshold voltages using special programming sequence —Reset signal valid to VCC = 1V —Monitor two voltages or detect power fail • Battery Switch Backup •VOUT: 5mA to 50mA from VCC; or 250µA from VBATT • Fault detection register • Selectable power on reset timeout (0.05s, 0.2s, 0.4s, 0.8s) • Selectable watchdog timer interval (25ms, 200ms, 1.4s, off) • Debounced manual reset input • Low power CMOS —25µA typical standby current, watchdog on —6µA typical standby current, watchdog off —1µA typical battery current in backup mode • 4Kbits of EEPROM —16 byte page write mode —Self-timed write cycle —5ms write cycle time (typical) • Built-in inadvertent write protection —Power-up/power-down protection circuitry —Block lock protect 0 or 1/2, of EEPROM • 400kHz 2-wire interface • 2.7V to 5.5V power supply operation • Available packages —14-lead SOIC, TSSOP APPLICATIONS • Communications Equipment —Routers, Hubs, Switches —Disk arrays • Industrial Systems —Process Control —Intelligent Instrumentation • Computer Systems —Desktop Computers —Network Servers X40420/21 DESCRIPTION The X40420/21 combines power-on reset control, watchdog timer, supply voltage supervision, and sec- ondary supervision, manual reset, and Block Lock™ protect serial EEPROM in one package. This combina- tion lowers system cost, reduces board space require- ments, and increases reliability. Applying voltage to VCC activates the power on reset circuit which holds RESET/RESET active for a period of time. This allows the power supply and system oscillator to stabilize before the processor can execute code. Standard VTRIP1 Level Standard VTRIP2 Level Suffix 4.6V (+/-1%) 2.9V(+/-1.7%) -A 4.6V (+/-1%) 2.6V (+/-2%) -B 2.9V(+/-1.7%) 1.6V (+/-3%) -C See “Ordering Information” for more details For Custom Settings, call Xicor. BLOCK DIAGRAM V2FAIL WDO MR LOWLINE RESET RESET X40420 X40421 + - V2 Monitor Logic VTRIP2 Fault Detection Register Status Register EEPROM Array Data Register Command Decode Test & Control Logic Power on, Manual Reset Low Voltage Reset Generation VCC Monitor Logic V2MON SDA WP SCL VCC (V1MON) Watchdog and Reset Logic System Switch Battery VBATT VOUT BATT-ON + - VTRIP1 VOUT VOUT VOUT • Monitor Voltages: 5V to 1.6V • Memory Security • Battery Switch Backup •VOUT 5mA to 50mA New Features Preliminary Datasheet |
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