MAX801L_05 MAXIM | Alldatasheet

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The MAX801/MAX808 microprocessor (µP) supervisory circuits monitor and control the activities of +5V µPs by providing backup-battery switchover, low-line indica- tion, and µP reset. Additional features include a watch- dog for the MAX801 and CMOS RAM write protection for the MAX808. The MAX801/MAX808 offer a choice of reset-threshold voltage (denoted by suffix letter): 4.675V (L), 4.575V (N), and 4.425V (M). These devices are available in 8-pin DIP and SO packages. Computers Controllers Intelligent Instruments Critical µP Power Monitoring Portable/Battery-Powered Equipment Embedded Systems ♦ Precision Voltage Monitoring, ±1.5% Reset Accuracy ♦ 200ms Power-OK/Reset Time Delay ♦ RESET Output (MAX808) RESET and RESET Outputs (MAX801) ♦ Watchdog Timer (MAX801) ♦ On-Board Gating of Chip-Enable Signals (MAX808): Memory Write-Cycle Completion 3ns CE Gate Propagation Delay ♦ 1µA Standby Current ♦ Power Switching: 250mA in V CC Mode 20mA in Battery-Backup Mode ♦ MaxCap™/SuperCap™ Compatible ♦ RESET Guaranteed Valid to VCC = 1V ♦ Low-Line Threshold 52mV Above Reset Threshold MAX801L/M/N, MAX808L/M/N 8-Pin µP Supervisory Circuits with ±1.5% Reset Accuracy 0.1μF 0.1μF 0.1μF μP POWER POWER FOR CMOS RAM NMIBATT VCC OUT +5V GND RESET FROM I/O SYSTEM OR ADDRESS DECODER TO CMOS RAM CE IN CE OUT LOWLINE RESET MAX808 µP SYSTEM 19-1086; Rev 1; 11/05 PART* MAX801_CPA MAX801_CSA MAX801_EPA -40°C to +85°C 0°C to +70°C 0°C to +70°C TEMP RANGE PIN-PACKAGE

8 Plastic DIP

MaxCap is a trademark of The Carborundum Corp. SuperCap is a trademark of Baknor Industries. Pin Configurations appear at end of data sheet. MAX801_ESA MAX801_MJA MAX808_CPA 0°C to +70°C -55°C to +125°C -40°C to +85°C 8 SO

8 CERDIP**

MAX808_CSA 0°C to +70°C 8 SO MAX808_EPA MAX808_ESA MAX808_MJA -55°C to +125°C -40°C to +85°C -40°C to +85°C 8 Plastic DIP 8 SO *These parts offer a choice of reset threshold voltage. From the table below, select the suffix corresponding to the desired thresh- old and insert it into the blank to complete the part number. **Contact factory for availability and processing to MIL-STD-883. Devices in PDIP, SO and µMAX packages are available in both leaded and lead-free packaging. Specify lead free by adding the + symbol at the end of the part number when ordering. Lead free not available for CERDIP package. RESET THRESHOLD (V) L 4.60 4.675 N 4.50 4.75 M 4.35 4.575 4.65 4.425 4.50 MIN MAX SUFFIX TYP For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX801L/M/N, MAX808L/M/N 8-Pin µP Supervisory Circuits with ±1.5% Reset Accuracy ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

TA = TMIN to TMAX. Typical values are at VCC = 5V and TA = +25°C, unless otherwise noted.) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Input Voltage (with respect to GND) Input Current Output Current Continuous Power Dissipation (T A = +70°C) Operating Temperature Ranges MAX808 MAX801 VCC = 0V, VBATT = 2.8V CONDITIONS µA 48 90 Supply Current in Normal Operating Mode (excludes I OUT) 68 110 V0 X 5.5Operating Voltage Range V CC, BATT (Note 1) 0.4 1 5 µA Supply Current in Battery- Backup Mode (excludes I OUT) (Note 2) UNITSMIN TYP MAXSYMBOLPARAMETER IOUT = 25mA VCC - 0.02 IOUT = 250mA, MAX80_C/E IOUT = 250mA, MAX80_M VCC - 0.45 VCC = 4.5V VCC - 0.38 V CC - 0.25 VCC = 3V, VBATT = 2.8V, IOUT = 100mA 1.0 1.5 V VCC - 0.25 V CC - 0.12 VOUT in Normal Operating Mode 1.8 VCC = 3V, IOUT = 100mA Ω 1.2 2.5 VCC to OUT On-Resistance VBATT = 2.8V, IOUT = 10mA VBATT- 0.25 V BATT- 0.12 VBATT = 4.5V, IOUT = 20mA VBATT- 0.16 VBATT = 2.0V, IOUT = 5mA VCC = 0V V VBATT- 0.20 V BATT- 0.08 VOUT in Battery-Backup Mode VBATT = 2.8V, IOUT = 10mA 12 25 VBATT = 4.5V, IOUT = 20mA 8 VBATT = 2.0V, IOUT = 5mA VCC = 0V Ω 16 40 BATT to OUT On-Resistance TA = +25°C TA = TMIN to TMAX MAX80_C/E MAX80_M TA = +25°C TA = TMIN to TMAX VBATT + 0.2V ≤ VCC -0.1 0.1 -1.0 1.0 µABATT Standby Current (Note 3) Power-up Power-downVBATT = 2.8V VBATT + 0.05 VBATT VBattery-Switchover Threshold 50 mVBattery-Switchover Hysteresis MAX80_C/EVCC = 4.5V, IOUT = 250mA MAX80_M

MAX801L/M/N, MAX808L/M/N 8-Pin µP Supervisory Circuits with ±1.5% Reset Accuracy ELECTRICAL CHARACTERISTICS (continued) TA = TMIN to TMAX. Typical values are at VCC = 5V and TA = +25°C, unless otherwise noted.) VCC rising and falling VCC rising VCC falling at 1mV/µs ISINK = 50µA, VBATT = 0V, VCC falling VCC falling at 1mV/µs MAX80_M VCC falling MAX80_L MAX80_N CONDITIONS 0.1 0.4 RESET Output Voltage 0.3 0.3 V 4.350 4.425 4.500 VRSTReset Threshold ms140 200 280tRP RESET Active Timeout Period µs17tLLVCC to LOWLINE Delay µs17tRDVCC to RESET Delay V 4.48 4.56 VLL LOWLINE Threshold, VCC Rising mV13Reset-Threshold Hysteresis mV30 52 70VLR LOWLINE to RESET Threshold Voltage 4.73 4.81 4.63 4.71 UNITSMIN TYP MAXSYMBOLPARAMETER MAX80_L MAX80_N 4.500 4.575 4.650 4.600 4.675 4.750 MAX80_M ISOURCE = 0.1mA VCC - 1.5 V CC - 0.1 V ISINK = 3.2mA ISOURCE = 5mA, VCC = 4.25V 0.4 VVCC - 1.5 RESET Output Voltage (MAX801) Output sink current Output source current, VCC = 4.25V ISINK = 3.2mA, VCC = 4.25V ISOURCE = 5mA, VCC = 4.25V 0.4 VVCC - 1.5LOWLINE Output Voltage 55 mA15ISC RESET Output Short- Circuit Current (MAX801) Output sink current, VCC = 4.25V Output source current 40 mA20ISC LOWLINE Output Short-Circuit Current VCC = 1.0V, MAX80_C VCC = 1.2V, MAX80_E/M ISINK = 3.2mA, VCC = 4.25V Output sink current, VCC = 4.25V Output source current 40 mA1.6ISC RESET Output Short-Circuit Current 1.12 1.6 2.24 sec 0.75 x VCC tWDWatchdog Timeout Period VIH V RESET deasserted, WDI = 0V 0.8 -50 -10 VIL WDI Threshold Voltage (Note 4) µARESET deasserted, WDI = VCC 16 50WDI Input Current VIL = 0.8V, VIH = 0.75V x VCC 100 nsMinimum Watchdog Input Pulse Width RESET AND LOW-LINE WATCHDOG TIMER (MAX801)

-55 -15 65 VCC SUPPLY CURRENT vs. TEMPERATURE (NORMAL OPERATING MODE) MAX801/808-01 TEMPERATURE (°C) VCC SUPPLY CURRENT (μA) 25 105-35 45 125 5 85 MAX808 MAX801 3.0 2.5 2.0 1.5 1.0 0.5 -60 -20 60 140 BATTERY SUPPLY CURRENT vs. TEMPERATURE (BATTERY-BACKUP MODE) MAX801/808-02 TEMPERATURE (°C) BATTERY SUPPLY CURRENT (μA) 20 100-40 40 12008 0 -60 -20 60 140 MAX808 CHIP-ENABLE PROPAGATION DELAY vs. TEMPERATURE MAX801/808-03 TEMPERATURE (°C) PROPAGATION DELAY (ns) 20 100-40 40 12008 0 MAX801L/M/N, MAX808L/M/N 8-Pin µP Supervisory Circuits with ±1.5% Reset Accuracy Note 1: Either VCC or VBATT can go to 0V if the other is greater than 2V. Note 2: The supply current drawn by the MAX80_ from the battery (excluding IOUT) typically goes to 15µA when (VBATT - 0.1V) < VCC < VBATT. In most applications, this is a brief period as VCC falls through this region (see Typical Operating Characteristics). Note 3: “+” = battery-discharging current, “-” = battery-charging current. Note 4: WDI is internally connected to a voltage divider between VCC and GND. If unconnected, WDI is typically driven to 1.8V, disabling the watchdog function. Note 5: The chip-enable resistance is tested with VCE IN = VCC / 2 and ICE IN = 1mA. Note 6: The chip-enable propagation delay is measured from the 50% point at CE IN to the 50% point at CE OUT. Note 7: If CE IN goes high, CE OUT goes high immediately and stays high until reset is deasserted and CE IN is low. ELECTRICAL CHARACTERISTICS (continued) TA = TMIN to TMAX. Typical values are at VCC = 5V and TA = +25°C, unless otherwise noted.) CONDITIONS Enabled mode, VCC = VRST(max) Ω75 150CE IN to CE OUT Resistance (Note 5) UNITSMIN TYP MAXSYMBOLPARAMETER VCC = 4.25V, CE OUT = 0V mA15CE OUT Short-Circuit Current (RESET Active) VCC = 5V, CLOAD = 50pF, 50Ω source-impedance driver ns38CE IN to CE OUT Propagation Delay (Note 6) VCC = 4.25V, IOUT = 2mA V3.5CE OUT Output Voltage High (RESET Active) VCC falling, CE IN = 0V µs18RESET to CE OUT Delay (Note 7) VCC = 4.25V ±0.00002 ±1 µACE IN Leakage Current VCC = 0V, IOUT = 10µA VBATT - 0.1 V BATT CHIP-ENABLE GATING (MAX808)CHIP-ENABLE GATING (MAX808) (VCC = 5V, VBATT = 2.8V, no load, TA = +25°C, unless otherwise noted.)

MAX801L/M/N, MAX808L/M/N 8-Pin µP Supervisory Circuits with ±1.5% Reset Accuracy 50Ω DRIVER 0 50 100 MAX808 CHIP-ENABLE PROPAGATION DELAY vs. CE OUT LOAD CAPACITANCE MAX801/808-04 CLOAD (pF) PROPAGATION DELAY (ns) 4.70 4.65 4.60 4.55 4.50 4.45 4.40 -60 -20 60 140 RESET THRESHOLD vs. TEMPERATURE MAX801/808-07 TEMPERATURE (°C) RESET THRESHOLD (V) 20 100-40 40 12008 0 MAX80_L MAX80_N MAX80_M -60 -20 60 140 BATT to OUT ON-RESISTANCE vs. TEMPERATURE MAX801/808-05 TEMPERATURE (°C) VBATT TO VOUT ON-RESISTANCE (Ω) 20 100-40 40 12008 0 VBATT = 2.0V VBATT = 2.8V VBATT = 4.5V VCC = 0V IOUT = 10mA 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 -60 -20 60 140 VCC to OUT ON-RESISTANCE vs. TEMPERATURE MAX801/808-06 TEMPERATURE (°C) VCC TO VOUT ON-RESISTANCE (Ω) 20 100-40 40 12008 0 IOUT = 250mA 280 260 240 220 200 180 160 140 -60 -20 60 140 RESET TIMEOUT PERIOD vs. TEMPERATURE (VCC RISING) MAX801/808-08 TEMPERATURE (°C) RESET TIMEOUT PERIOD (ms) 20 100-40 40 12008 0 -60 -20 60 140 LOWLINE to RESET THRESHOLD vs. TEMPERATURE (VCC FALLING) MAX801/808-09 TEMPERATURE (°C) LOWLINE TO RESET THRESHOLD (mV) 20 100-40 40 12008 0 (VCC = 5V, VBATT = 2.8V, no load, TA = +25°C, unless otherwise noted.) 4.75 4.80 4.70 4.65 4.60 4.55 4.50 4.45 4.40 -60 -20 60 140 LOWLINE THRESHOLD vs. TEMPERATURE (VCC RISING) MAX801/808-10 TEMPERATURE (°C) LOWLINE THRESHOLD (V) 20 100-40 40 12008 0 MAX80_L MAX80_N MAX80_M -60 -20 60 140 LOWLINE COMPARATOR PROPAGATION DELAY vs. TEMPERATURE (VCC FALLING) MAX801/808-11 TEMPERATURE (°C) PROPAGATION DELAY (µs) 20 100-40 40 12008 0 VCC FALLING AT 1mV/µs -60 -20 60 140 RESET COMPARATOR PROPAGATION DELAY vs. TEMPERATURE (VCC FALLING) MAX801/808-12 TEMPERATURE (°C) PROPAGATION DELAY (µs) 20 100-40 40 12008 0 VCC FALLING AT 1mV/µs

MAX801L/M/N, MAX808L/M/N 8-Pin µP Supervisory Circuits with ±1.5% Reset Accuracy BATTERY CURRENT vs. INPUT SUPPLY VOLTAGE MAX801/808-13 VCC (V) BATTERY CURRENT (µA) 1000 100 1 100 10 1000 VCC to OUT VOLTAGE vs. OUTPUT CURRENT MAX801/808-15 IOUT (mA) VCC TO VOUT VOLTAGE (mV) SLOPE = 1.0Ω 1000 100 1 10 100 BATT to OUT VOLTAGE vs. OUTPUT CURRENT MAX801/808-14 IOUT (mA) VBATT TO VOUT VOLTAGE (mV) VCC = 0V SLOPE = 12Ω 1000 100 1 100 10 1000 MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE MAX801/808-16 RESET THRESHOLD OVERDRIVE (mV) MAXIMUM TRANSIENT DURATION (µs) RESET OCCURS (VCC = 5V, VBATT = 2.8V, no load, TA = +25°C, unless otherwise noted.) RESET LOWLINE VCC Active-Low Reset Output. RESET is triggered and stays low when VCC is below the reset threshold (or during a watchdog timeout for the MAX801). It remains low 200ms after VCC rises above the reset threshold (or 200ms after the watchdog timeout occurs). RESET has a strong pull-down but a relatively weak pull-up, and can be wire-OR con- nected to logic gates. Valid for VCC ≥ 1V. RESET swings between VCC and GND. NAME Low-Line Comparator Output. This CMOS-logic output goes low when VCC falls to 52mV above the reset threshold. Use LOWLINE to generate an NMI, initiating an orderly shut- down routine when VCC is falling. LOWLINE swings between VCC and GND. Input Supply Voltage, nominally +5V. Bypass with a 0.1µF capacitor to GND.11 MAX801 MAX808 FUNCTION PIN GND Ground44

nects to BATT. Bypass OUT with a 0.1µF capacitor to GND. Figure 1. Functional Diagram