19-4334; Rev. 5; 9/95 Low-Cost, µP Supervisory Circuits The MAX705-MAX708/MAX813L microprocessor (µP) supervisory circuits reduce the complexity and number of components required to monitor power-supply and battery functions in µP systems. These devices significantly improve system reliability and accuracy compared to separate ICs or discrete components. The MAX705/MAX706/MAX813L provide four functions: 1) A reset output during power-up, power-down, and brownout conditions. 2) An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds. 3) A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power supply other than +5V. 4) An active-low manual-reset input. The MAX707/MAX708 are the same as the MAX705/ MAX706, except an active-high reset is substituted for the watchdog timer. The MAX813L is the same as the MAX705, except RESET is provided instead of RESET. Two supply-voltage monitor levels are available: The MAX705/MAX707/MAX813L generate a reset pulse when the supply voltage drops below 4.65V, while the MAX706/MAX708 generate a reset pulse below 4.40V. All four parts are available in 8-pin DIP, SO and µMAX packages. _______________________Applications ___________________________Features ♦ µMAX Package: Smallest 8-Pin SO ♦ Guaranteed RESET Valid at VCC = 1V ♦ Precision Supply-Voltage Monitor 4.65V in MAX705/MAX707/MAX813L 4.40V in MAX706/MAX708 ♦ 200ms Reset Pulse Width ♦ Debounced TTL/CMOS-Compatible Manual-Reset Input ♦ Independent Watchdog Timer—1.6sec Timeout (MAX705/MAX706) ♦ Active-High Reset Output (MAX707/MAX708/MAX813L) ♦ Voltage Monitor for Power-Fail or Low-Battery Warning ______________Ordering Information PART TEMP. RANGE MAX705CPA 0°C to +70°C PIN-PACKAGE 8 Plastic DIP MAX705CSA 0°C to +70°C 8 SO MAX705CUA 0°C to +70°C 8 µMAX MAX705C/D 0°C to +70°C Dice* Ordering Information continued at end of data sheet. * Dice are specified at TA = +25°C. **Contact factory for availability and processing to MIL-STD-883. _________________Pin Configurations Computers Controllers Intelligent Instruments Automotive Systems Critical µP Power Monitoring TOP VIEW MR 1 VCC 2 GND 3 __________Typical Operating Circuit PFI 4 MAX705 MAX706 MAX813L 8 WDO 7 RESET (RESET) 6 WDI 5 PFO 8 RESET 7 RESET 6 N.C. 5 PFO DIP/SO UNREGULATED DC MAX667 +5V DC LINEAR REGULATOR µP VCC PFI PUSHBUTTON SWITCH MR RESET PFI MAX705 WDO MAX706 PFO MAX813L VCC RESET I/O LINE NMI INTERRUPT MR 1 VCC 2 GND 3 MAX707 MAX708 PFI 4 DIP/SO ( ) ARE FOR MAX813L ONLY. Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. 1 MAX705–MAX708/MAX813L _______________General Description MAX705–MAX708/MAX813L Low-Cost, µP Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V All Other Inputs (Note 1) . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V) Input Current VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Output Current (all outputs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Continuous Power Dissipation Plastic DIP (derate 9.09mW/°C above +70°C) . . . . . . . 727mW SO (derate 5.88mW/°C above +70°C) . . . . . . . . . . . . . . . 471mW µMAX (derate 4.10mW/°C above +70°C) . . . . . . . . . . . . 330mW CERDIP (derate 8.00mW/°C above +70°C) . . . . . . . . . . 640mW Operating Temperature Ranges MAX70_C__, MAX813LC__ . . . . . . . . . . . . . . . . . . . . 0°C to +70°C MAX70_E__, MAX813LE__ . . . . . . . . . . . . . . . . . . . -40°C to +85°C MAX70_MJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C Storage Temperature Range . . . . . . . . . . . . . . . . -65°C to +160°C Lead Temperature (soldering, 10sec) . . . . . . . . . . . . . . . . +300°C Note 1: The input voltage limits on PFI and MR can be exceeded if the input current is less than 10mA. 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 specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = 4.75V to 5.5V for MAX705/MAX707/MAX813L, VCC = 4.5V to 5.5V for MAX706/MAX708, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER Operating Voltage Range Supply Current SYMBOL VCC ISUPPLY Reset Threshold (Note 2) VRT Reset Threshold Hysteresis (Note 2) Reset Pulse Width (Note 2) tRS RESET Output Voltage RESET Output Voltage Watchdog Timeout Period WDI Pulse Width Low WDI Input Threshold High WDI Input Current WDO Output Voltage 2 tWD tWP CONDITIONS MIN MAX70_C MAX813LC MAX70_E/M, MAX813LE/M MAX705C, MAX706C, MAX813LC MAX705E/M, MAX706E/M, MAX813LE/M MAX707C, MAX708C MAX707E/M, MAX708E/M MAX705, MAX707, MAX813L MAX706, MAX708 1.0 1.1 1.2 4.50 4.25 140 VCC - 1.5 TYP 150 150 50 50 4.65 4.40 40 200 ISOURCE = 800µA ISINK = 3.2mA MAX70_C, VCC = 1V, ISINK = 50µA MAX70_E/M, VCC = 1.2V, ISINK = 100µA MAX707, MAX708, ISOURCE = 800µA VCC - 1.5 MAX707, MAX708, ISINK = 1.2mA MAX813LC, ISOURCE = 4µA, VCC = 1.1V 0.8 MAX813LE/M, ISOURCE = 4µA, VCC = 1.2V 0.9 ISOURCE = 800µA VCC - 1.5 MAX813L ISINK = 3.2mA MAX705, MAX706, MAX813L 1.00 1.60 VIL = 0.4V, VIH = (VCC) (0.8) 50 MAX705, MAX706, MAX813L, VCC = 5V MAX705, MAX706, MAX813L, WDI = VCC MAX705, MAX706, MAX813L, WDI = 0V MAX705, MAX706, MAX813L, ISOURCE = 800µA MAX 5.5 5.5 5.5 350 500 350 500 4.75 4.50 280 0.4 0.3 0.3 µA V mV ms V V 0.4 2.25 0.8 50 -50 V 0.4 3.5 -150 UNITS 150 sec ns V µA VCC - 1.5 MAX705, MAX706, MAX813L, ISINK = 1.2mA _______________________________________________________________________________________ V 0.4 Low-Cost, µP Supervisory Circuits (VCC = 4.75V to 5.5V for MAX705/MAX707/MAX813L, VCC = 4.5V to 5.5V for MAX706/MAX708, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL MR Pull-Up Current CONDITIONS MR = 0V MR Pulse Width tMR MR to Reset Out Delay (Note 2) PFI Input Threshold MAX UNITS 250 600 µA ns 0.8 2.0 tMD 250 VCC = 5V PFI Input Current PFO Output Voltage TYP 100 150 Low High MR Input Threshold MIN ISOURCE = 800µA ISINK = 3.2mA V ns 1.20 1.25 1.30 V -25.00 0.01 25.00 nA VCC - 1.5 0.4 V Note 2: Applies to both RESET in the MAX705-MAX708 and RESET in the MAX707/MAX708/MAX813L. _______________________________________________________________________________________ 3 MAX705–MAX708/MAX813L ELECTRICAL CHARACTERISTICS (continued) __________________________________________Typical Operating Characteristics MAX705/MAX707 RESET OUTPUT VOLTAGE vs. SUPPLY VOLTAGE MAX705/MAX707 RESET RESPONSE TIME POWER-FAIL COMPARATOR DE-ASSERTION RESPONSE TIME +5V VCC +4V TA = +25°C VCC GND RESET 330pF 1V/div RESET RESET VCC 2k PFO 30pF 1k +1.25V +3V 1V/div +5V VCC VCC = +5V TA = +25°C PFO +5V 0V +5V PFI +5V VCC TA = +25°C 1V/div RESET VCC RESET GND 10k 0V RESET 30pF PFI +1.30V +1.20V 0V 0V 500ms/div 2µs/div 400ns/div POWER-FAIL COMPARATOR ASSERTION RESPONSE TIME MAX707 RESET, RESET ASSERTION MAX707 RESET, RESET DE-ASSERTION VCC = VRT TA = +25°C +5V +5V PFO PFI PFO 1k +5V RESET RESET GND 0V 50mV/div VCC = +5V TA = +25°C 10k +5V 10k 330pF 330pF 10k 330pF RESET 400ns/div MAX707/MAX708/MAX813L RESET OUTPUT VOLTAGE vs. SUPPLY VOLTAGE 400ns/div MAX813L RESET RESPONSE TIME +5V +5V TA = +25°C 1V/div 0V +5V 10k +4V VCC RESET 0V GND 10k 330pF +4V 330pF 0V 0V 500ms/div 4 VCC 1V/div RESET VCC RESET GND 330pF 0V 400ns/div VCC RESET 10k RESET RESET GND RESET 0V +1.20V VCC 0V 2V/div VCC 1V/div 0V 30pF PFI +5V RESET +1.25V +1.30V VCC = VRT TA = +25°C +5V 1V/div MAX705–MAX708/MAX813L Low-Cost, µP Supervisory Circuits 2µs/div _______________________________________________________________________________________ Low-Cost, µP Supervisory Circuits PIN MAX705/MAX706 MAX707/MAX708 DIP/SO DIP/SO µMAX µMAX MAX813L DIP/SO NAME FUNCTION µMAX 1 3 1 3 1 3 MR Manual-Reset Input triggers a reset pulse when pulled below 0.8V. This active-low input has an internal 250µA pull-up current. It can be driven from a TTL or CMOS logic line as well as shorted to ground with a switch. 2 4 2 4 2 4 VCC +5V Supply Input 3 5 3 5 3 5 GND 0V Ground Reference for all signals 4 6 4 6 4 6 PFI Power-Fail Voltage Monitor Input. When PFI is less than 1.25V, PFO goes low. Connect PFI to GND or VCC when not used. 5 7 5 7 5 7 PFO Power-Fail Output goes low and sinks current when PFI is less than 1.25V; otherwise PFO stays high. 6 8 - - 6 8 WDI Watchdog Input. If WDI remains high or low for 1.6sec, the internal watchdog timer runs out and WDO goes low (Figure 1). Floating WDI or connecting WDI to a high-impedance three-state buffer disables the watchdog feature. The internal watchdog timer clears whenever reset is asserted, WDI is threestated, or WDI sees a rising or falling edge. - - 6 - - - N.C. No Connect 7 8 - 1 2 - 7 - 8 1 - 2 - 8 7 - 2 1 RESET Active-Low Reset Output pulses low for 200ms when triggered, and stays low whenever VCC is below the reset threshold (4.65V in the MAX705 and 4.40V in the MAX706). It remains low for 200ms after VCC rises above the reset threshold or MR goes from low to high (Figure 3). A watchdog timeout will not trigger RESET unless WDO is connected to MR. WDO Watchdog Output pulls low when the internal watchdog timer finishes its 1.6sec count and does not go high again until the watchdog is cleared. WDO also goes low during low-line conditions. Whenever VCC is below the reset threshold, WDO stays low; however, unlike RESET, WDO does not have a minimum pulse width. As soon as VCC rises above the reset threshold, WDO goes high with no delay. RESET Active-High Reset Output is the inverse of RESET. Whenever RESET is high, RESET is low, and vice versa (Figure 2). The MAX813L has a RESET output only. _______________________________________________________________________________________ 5 MAX705–MAX708/MAX813L ______________________________________________________________Pin Description MAX705–MAX708/MAX813L Low-Cost, µP Supervisory Circuits WDI 6 WATCHDOG TRANSITION DETECTOR WATCHDOG TIMER VCC VCC WDO 1 MR 7 RESET GENERATOR 2 8 VCC RESET (RESET) VCC 1 RESET GENERATOR 2 4.65V* PFI PFI 5 7 RESET MAX707 MAX708 4.65V* MAX705 MAX706 MAX813L 4 RESET 250µA TIMEBASE FOR RESET AND WATCHDOG 250µA MR 8 4 5 PFO PFO 1.25V 1.25V * 4.40V FOR MAX7O6. ( ) ARE FOR MAX813L ONLY. 3 3 GND GND * 4.40V FOR MAX7O6. Figure 1. MAX705/MAX706/MAX813L Block Diagram Figure 2. MAX707/MAX708 Block Diagram _______________Detailed Description WDI input is three-stated, the watchdog timer will stay cleared and will not count. As soon as reset is released and WDI is driven high or low, the timer will start counting. Pulses as short as 50ns can be detected. Typically, WDO will be connected to the non-maskable interrupt input (NMI) of a µP. When VCC drops below the reset threshold, WDO will go low whether or not the watchdog timer has timed out yet. Normally this would trigger an NMI interrupt, but RESET goes low simultaneously, and thus overrides the NMI interrupt. If WDI is left unconnected, WDO can be used as a lowline output. Since floating WDI disables the internal timer, WDO goes low only when VCC falls below the reset threshold, thus functioning as a low-line output. The MAX705/MAX706 have a watchdog timer and a RESET output. The MAX707/MAX708 have both activehigh and active-low reset outputs. The MAX813L has both an active-high reset output and a watchdog timer. Reset Output A microprocessor’s (µP’s) reset input starts the µP in a known state. Whenever the µP is in an unknown state, it should be held in reset. The MAX705-MAX708/MAX813L assert reset during power-up and prevent code execution errors during power-down or brownout conditions. On power-up, once VCC reaches 1V, RESET is a guaranteed logic low of 0.4V or less. As VCC rises, RESET stays low. When VCC rises above the reset threshold, an internal timer releases RESET after about 200ms. RESET pulses low whenever VCC dips below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse, the pulse continues for at least another 140ms. On power-down, once VCC falls below the reset threshold, RESET stays low and is guaranteed to be 0.4V or less until VCC drops below 1V. The MAX707/MAX708/MAX813L active-high RESET output is simply the complement of the RESET output, and is guaranteed to be valid with VCC down to 1.1V. Some µPs, such as Intel’s 80C51, require an active-high reset pulse. Watchdog Timer The MAX705/MAX706/MAX813L watchdog circuit monitors the µP’s activity. If the µP does not toggle the watchdog input (WDI) within 1.6sec and WDI is not three-stated, WDO goes low. As long as RESET is asserted or the 6 Manual Reset The manual-reset input (MR) allows reset to be triggered by a pushbutton switch. The switch is effectively debounced by the 140ms minimum reset pulse width. MR is TTL/CMOS logic compatible, so it can be driven by an external logic line. MR can be used to force a watchdog timeout to generate a reset pulse in the MAX705/MAX706/MAX813L. Simply connect WDO to MR. _______________________________________________________________________________________ Low-Cost, µP Supervisory Circuits tWP WDI tWD tWD tWD 0V When VCC falls below 1V, the MAX705-MAX708 RESET output no longer sinks current—it becomes an open circuit. High-impedance CMOS logic inputs can drift to undetermined voltages if left undriven. If a pull-down resistor is added to the RESET pin as shown in Figure 5, any stray charge or leakage currents will be drained to ground, holding RESET low. Resistor value (R1) is not critical. It should be about 100kΩ, large enough not to load RESET and small enough to pull RESET to ground. +5V 0V +5V RESET 0V RESET EXTERNALLY TRIGGERED BY MR +5V (RESET) tRS Monitoring Voltages Other Than the Unregulated DC Input 0V ( ) ARE FOR MAX813L ONLY. Figure 3. MAX705/MAX706/MAX813L Watchdog TIming VRT VRT VCC tRS tRS +5V RESET +5V MR 0V tMD tMR WDO 0V Monitor voltages other than the unregulated DC by connecting a voltage divider to PFI and adjusting the ratio appropriately. If required, add hysteresis by connecting a resistor (with a value approximately 10 times the sum of the two resistors in the potential divider network) between PFI and PFO. A capacitor between PFI and GND will reduce the power-fail circuit’s sensitivity to high-frequency noise on the line being monitored. RESET can be asserted on other voltages in addition to the +5V VCC line. Connect PFO to MR to initiate a RESET pulse when PFI drops below 1.25V. Figure 6 shows the MAX705-MAX708 configured to assert RESET when the +5V supply falls below the reset threshold, or when the +12V supply falls below approximately 11V. Monitoring a Negative Voltage 0V +5V __________Applications Information Ensuring a Valid RESET Output Down to VCC = 0V +5V WDO To build an early-warning circuit for power failure, connect the PFI pin to a voltage divider (see Typical Operating Circuit). Choose the voltage divider ratio so that the voltage at PFI falls below 1.25V just before the +5V regulator drops out. Use PFO to interrupt the µP so it can prepare for an orderly power-down. MR EXTERNALLY DRIVEN LOW The power-fail comparator can also monitor a negative supply rail (Figure 7). When the negative rail is good (a negative voltage of large magnitude), PFO is low, and when the negative rail is degraded (a negative voltage of lesser magnitude), PFO is high. By adding the resistors and transistor as shown, a high PFO triggers reset. As long as PFO remains high, the MAX705MAX708/MAX813L will keep reset asserted (RESET = low, RESET = high). Note that this circuit’s accuracy depends on the PFI threshold tolerance, the VCC line, and the resistors. Figure 4. MAX705/MAX706 RESET, MR, and WDO Timing with WDI Three-Stated. The MAX707/MAX708/MAX813L RESET output is the inverse of RESET shown. _______________________________________________________________________________________ 7 MAX705–MAX708/MAX813L Power-Fail Comparator The power-fail comparator can be used for various purposes because its output and noninverting input are not internally connected. The inverting input is internally connected to a 1.25V reference. MAX705–MAX708/MAX813L Low-Cost, µP Supervisory Circuits +12V +5V VCC 1M 1% TO µP RESET MAX70_ MAX70_ MR 130k 1% RESET PFI PFO GND R1 PARAMETER MIN TYP MAX UNIT +12V Reset 10.67 10.87 11.50 Threshold at +25°C Figure 5. RESET Valid to Ground Circuit V Figure 6. Monitoring Both +5V and +12V +5V BUFFERED RESET TO OTHER SYSTEM COMPONENTS VCC 100k MR R1 MAX70_ 100k 2N3904 PFO PFI VCC VCC MAX70_ R2 RESET TO µP GND V- µP 4.7k RESET GND +5V MR RESET GND 0V +5V PFO 0V VTRIP V5 − 1.25 R1 = 1.25 − VTRIP R2 , VTRIP < 0 Figure 7. Monitoring a Negative Voltage 8 Figure 8. Interfacing to µPs with Bidirectional Reset I/O 0V Interfacing to µPs with Bidirectional Reset Pins µPs with bidirectional reset pins, such as the Motorola 68HC11 series, can contend with the MAX705-MAX708 RESET output. If, for example, the RESET output is driven high and the µP wants to pull it low, indeterminate logic levels may result. To correct this, connect a 4.7kΩ resistor between the RESET output and the µP reset I/O, as in Figure 8. Buffer the RESET output to other system components. _______________________________________________________________________________________ Low-Cost, µP Supervisory Circuits PART TEMP. RANGE PIN-PACKAGE MAX705EPA -40°C to +85°C 8 Plastic DIP MAX705ESA -40°C to +85°C 8 SO _______Pin Configuration (continued) TOP VIEW (RESET) RESET 1 MAX705MJA -55°C to +125°C 8 CERDIP** WDO 2 MAX706CPA 0°C to +70°C 8 Plastic DIP MR 3 MAX706CSA 0°C to +70°C 8 SO V CC 4 MAX706CUA 0°C to +70°C 8 µMAX MAX706C/D 0°C to +70°C Dice* MAX706EPA -40°C to +85°C 8 Plastic DIP MAX706ESA -40°C to +85°C 8 SO MAX706MJA -55°C to +125°C 8 CERDIP** MAX707CPA 0°C to +70°C 8 Plastic DIP MAX707CSA 0°C to +70°C 8 SO MAX707CUA 0°C to +70°C 8 µMAX MAX707C/D 0°C to +70°C Dice* MAX707EPA -40°C to +85°C 8 Plastic DIP MAX707ESA -40°C to +85°C 8 SO MAX707MJA -55°C to +125°C 8 CERDIP** MAX708CPA 0°C to +70°C 8 Plastic DIP MAX708CSA 0°C to +70°C 8 SO MAX708CUA 0°C to +70°C 8 µMAX MAX708C/D 0°C to +70°C Dice* MAX708EPA -40°C to +85°C MAX705 MAX706 MAX813L 8 WDI 7 PFO 6 PFI 5 GND 8 N.C. 7 PFO 6 PFI 5 GND µMAX RESET 1 RESET 2 MR 3 V CC 4 MAX707 MAX708 µMAX ( ) ARE FOR MAX813L ONLY. ____________________Chip Topography V CC MR WDO/RESET 8 Plastic DIP MAX708ESA -40°C to +85°C 8 SO MAX708MJA -55°C to +125°C 8 CERDIP** MAX813LCPA 0°C to +70°C 8 Plastic DIP MAX813LCSA 0°C to +70°C 8 SO MAX813LCUA 0°C to +70°C 8 µMAX MAX813LC/D 0°C to +70°C Dice* MAX813LEPA -40°C to +85°C 8 Plastic DIP MAX813LESA -40°C to +85°C 8 SO MAX813LMJA -55°C to +125°C 8 CERDIP** * Dice are specified at TA = +25 °C. **Contact factory for availability and processing to MIL-STD-883. RESET (RESET) WDI/N.C. 0.051" (1.30mm) GND PFI PFO 0.074" (1.88mm) ( ) ARE FOR MAX813L ONLY. TRANSISTOR COUNT: 572 SUBSTRATE MUST BE LEFT UNCONNECTED. _______________________________________________________________________________________ 9 MAX705–MAX708/MAX813L __Ordering Information (continued) MAX705–MAX708/MAX813L Low-Cost, µP Supervisory Circuits _______________________________________________________Package Information DIM C α A 0.101mm 0.004 in e B A1 L A A1 B C D E e H L α INCHES MAX MIN 0.044 0.036 0.008 0.004 0.014 0.010 0.007 0.005 0.120 0.116 0.120 0.116 0.0256 0.198 0.188 0.026 0.016 6° 0° MILLIMETERS MIN MAX 0.91 1.11 0.10 0.20 0.25 0.36 0.13 0.18 2.95 3.05 2.95 3.05 0.65 4.78 5.03 0.41 0.66 0° 6° 21-0036D E H 8-PIN µMAX MICROMAX SMALL-OUTLINE PACKAGE D 10 ______________________________________________________________________________________ ______________________________________________________________________________________ † †† 6 10 6 TBD TBD ✔ ✔ ✔ ✔ ✔ 2.5 TBD TBD TBD 1.2 TBD 10 ✔ ✔ ✔ ✔ ✔ ✔ ✔ 1.2 ✔ 667 400 TBD TBD 400 400 TBD TBD TBD 25 TBD 400 25 400 400 ✔ ✔/10ns ✔ ✔ ✔ ✔ ✔ ✔/10ns ✔/10ns ✔/10ns ✔ ✔/10ns VBATT-to-VOUT On Resistance Max (Ω) –—– CE Write Protect 400 400 25 Power-Fail Comparator ✔/±2% ✔/±2% ✔/±2% ✔/±2% ✔/±2% ✔/±2% ✔ ✔/±2% ✔ ✔/±2% ✔ ✔/±2% ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ Manual-Reset Input ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ Low-Line Output Nominal Watchdog Timeout Period (sec), if Available –————– RESET Valid to VCC = 1V Active-High Reset Active-Low Reset Minimum Reset Pulse Width (ms) Nominal Reset Threshold (V) Battery-On Output ✔ ✔ ✔ ✔ ✔ Prices provided are for design guidance and are FOB USA (unless otherwise noted). International prices will differ due to local duties, taxes, and exchange rates. Future product—contact factory for pricing and availability. Specifications are preliminary. 25,000 pc. price, factory direct MXD1210 MAX813L MAX814K/L/N/T MAX815K/L/N/T MAX816 MAX820L/M/R/S/T MAX810L/M/R/S/T MAX806R/S/T MAX807L/N/M MAX808L/N/M MAX809L/M/R/S/T MAX804R/S/T MAX805L/M/R/S/T MAX793R/S/U/T MAX794 MAX795R/S/U/T MAX800L/M MAX801L/N/M MAX802L/M/R/S/T 10 6 10 6 1.2 VCC-to-VOUT On Resistance Max (Ω) ✔ ✔ ✔ ✔ ✔ ✔ Separate Watchdog Output Backup-Battery Switch 4.37/4.62 250 ✔ ✔ ✔ 0.15/0.6/1.2 4.65/4.40 140 ✔ ✔ 1.6 2.63/2.93/3.08 140 ✔ ✔ 1.6 4.65/4.40 140/adj. ✔ ✔ ✔ 1.6/adj. ✔ The MAX1691 is a module with the MAX691A and a 125mAh lithium battery Adj. 35/adj. ✔ ✔ 1.6/adj. ✔ Adj. 35/adj. ✔ ✔ 1.6/adj. ✔ 4.65/adj. 200 ✔ ✔ 4.65/4.40 140 ✔ ✔ 2.63/2.93/3.08 140 ✔ ✔ 4.65/4.40 140 ✔ ✔ 1.6 ✔ 2.63 140 ✔ ✔ 1.6 ✔ 2.63/2.93/3.08 140 ✔ ✔ 1.6 ✔ 4.65/4.40 140 ✔ ✔ ✔ 2.63/2.93/3.08 140 ✔ ✔ ✔ 4.65 140 ✔ ✔ ✔ 1 ✔ 4.65/4.40/ 140 ✔ ✔ ✔ 1 ✔ 2.63/2.93/3.08 2.63/2.93/3.07/3.08 140 ✔ ✔ ✔ 1.6 ✔ Adj. 140 ✔ ✔ ✔ 1.6 ✔ 2.63/2.93/3.07/3.08 140 ✔ ✔ 4.60/4.40 140 ✔ ✔ ✔ 1.6/adj. ✔ 4.68/4.58/4.43 140 ✔/±1.5% ✔ 1.6 4.60/4.40/ 140 ✔ ✔ 1.6 2.63/2.93/3.08 2.63/2.93/3.08 140 ✔ ✔ 1.6 4.65/4.40/ 140 ✔ ✔ 1.6 2.63/2.93/3.08 2.63/2.93/3.08 140 ✔ ✔ ✔ 4.68/4.58/4.43 140 ✔/±1.5% ✔/±1.5% ✔ 1.6 ✔ 4.68/4.58/4.43 140 ✔/±1.5% ✔ 4.65/4.40/ 140 ✔ ✔ 2.63/2.93/3.08 4.65/4.40/ 140 ✔ ✔ 2.63/2.93/3.08 4.65 140 ✔ ✔ 1.6 ✔ 4.80/4.70/4.55/3.03 140 ✔/±1% ✔/±1% ✔ 4.80/4.70/4.55/3.03 140 ✔/±1% ✔ 1.6 ✔ Adj./±1% 140 ✔ ✔ ✔ 4.65/4.40/ 140 ✔ ✔ ✔ 1 ✔ 2.63/2.93/3.08 4.37/4.62 ISUPPLY Operating Mode mA max (typ) 0.5(0.23) 0.35(0.2) TBD TBD TBD 0.15(0.07) 0.06(0.024) 0.5(0.4) TBD TBD 0.06(0.024) 0.5(0.4) 0.35(0.2) TBD TBD TBD 0.1(0.035) TBD 0.35(0.2) 0.2(0.1) 0.35(0.2) 0.5(0.4) 0.35(0.2) 0.35(0.2) 0.35(0.2) 0.35(0.2) 0.35(0.2) 0.15(0.06) 0.15(0.07) 0.2(0.05) 0.35(0.2) 0.5(0.4) 0.1(0.035) ISUPPLY Backup Mode µA max (typ) 0.1(0.002) TBD TBD TBD 1(0.4) TBD TBD 1(0.4) 5(0.05) TBD TBD TBD 5(0.04) TBD 5(0.05) 5(0.04) 5(0.05) 1(0.4) 5(0.05) 1(0.4) 5(0.04) 8 8 8 8 8 16 3 8 8 16 3 8 8 16 16 8 16 8 8 8 8 8 16 16 16 16 8 8 8 8 8 8 8 8 16 16 Pins 2.44 1.02* †† †† †† 3.82 †† 3.90 †† †† †† 3.66 3.26 †† †† †† 3.88 †† 3.59 1.71 3.26 3.23 3.61 †† 3.55 3.58 2.17 1.38* 2.93 1.02* 1.71 1.71 0.88* 1.63 3.90 3.42 MAX705–MAX708/MAX813L * Part Number MAX1232 MAX690A/692A MAX690R/S/T MAX691A/693A MAX1691 MAX696 MAX697 MAX700 MAX703/704 MAX704R/S/T MAX705/706 MAX706P MAX706R/S/T MAX707/708 MAX708R/S/T MAX791 MAX792L/M/R/S/T Price† 1000-up ($) ___________________________________________µP Supervisory Circuits Low-Cost, µP Supervisory Circuits 11 MAX705–MAX708/MAX813L Low-Cost, µP Supervisory Circuits Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.