MAX706P/R/S/T, MAX706AP/AR/AS/AT, MAX708R/S/T 19-0099 Rev 5 4/06 +3V Voltage Monitoring, Low-Cost P Supervisory Circuits General Description Features The MAX706P/R/S/T, MAX706AP/AR/AS/AT, and MAX Package, Small 8-Pin SO MAX708R/S/T microprocessor (P) supervisory circuits Precision Supply-Voltage Monitors reduce the complexity and number of components 2.63V (MAX706P/R, MAX706AP/AR, and MAX708R) required to monitor +3V power-supply levels in +3V to 2.93V (MAX706S, MAX706AS, and MAX708S) +5V P systems. These devices significantly improve 3.08V (MAX706T, MAX706AT, and MAX708T) system reliability and accuracy compared to separate ICs or discrete components. 200ms Reset Time Delay The MAX706P/R/S/T and MAX706AP/AR/AS/AT supervi- Debounced TTL/CMOS-Compatible Manual Reset sory circuits provide the following four functions: Input 1) A reset output during power-up, power-down, and 100A Quiescent Current brownout conditions. WDI Disable Feature (MAX706AP/AR/AS/AT) 2) An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6s. Watchdog Timer: 1.6s Timeout 3) A 1.25V threshold detector for power-fail warning, Reset Output Signal: low-battery detection, or for monitoring a power Active-High Only (MAX706P, MAX706AP) supply other than the main supply. Active-Low Only (MAX706R/S/T, MAX706AR/AS/AT) 4) An active-low, manual-reset input. Active-High and Active-Low (MAX708R/S/T) The only difference between the MAX706R/AR, Voltage Monitor for Power-Fail or Low-Battery MAX706S/AS, and MAX706T/AT is the reset-threshold Warning voltage levels, which are 2.63V, 2.93V, and 3.08V, respectively. All have active-low reset output signals. 8-Pin Surface-Mount Package The MAX706P/AP are identical to the MAX706R/AR, Guaranteed RESET Assertion to V = 1V CC except the reset output signal is active-high. The watch- dog timer function for the MAX706AP/AR/AS/AT dis- Ordering Information ables when the WDI input is left open or connected to a high-impedance state of a low-leakage tri-state output. TEMP PIN- PKG PART RANGE PACKAGE CODE The MAX708R/S/T provide the same functions as the MAX706R/S/T and MAX706AR/AS/AT except they do MAX706PCPA 0C to +70C 8 PDIP P8-1 not have a watchdog timer. Instead, they provide both MAX706PCSA 0C to +70C 8 SO S8-2 RESET and RESET outputs. As with the MAX706, MAX706PCUA 0C to +70C 8 MAX U8-1 devices with R, S, and T suffixes have reset thresholds MAX706PEPA -40C to +85C 8 PDIP P8-1 of 2.63V, 2.93V, and 3.08V, respectively. SO, MAX, and PDIP packages are available in lead-free. These devices are available in 8-pin SO, DIP, and Ordering Information continued at end of data sheet. MAX packages and are fully specified over the oper- Pin Configurations appear at end of data sheet. ating temperature range. Typical Operating Circuits Applications UNREGULATED Battery-Powered Equipment DC-DC DC CONVERTER MAX639 Portable Instruments +3V/+3.3V V CC Computers P Controllers MAX706R/S/T MAX706AR/AS/AT Intelligent Instruments V CC RESET RESET Critical P Power Monitoring WDI I/O LINE PFI WDO NMI MR PUSHBUTTON INTERRUPT PFO GND SWITCH MAX is a registered trademark of Maxim Integrated Products, Inc. Typical Operating Circuits continued at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.+3V Voltage Monitoring, Low-Cost P Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) 8-Pin SO (derate 5.9mW/C above +70C)................470.6mW o V ........................................................................-0.3V to +6V 8-Pin MAX (derate 4.5mW/ C above +70C)..............362mW CC All Other Inputs (Note 1)..........................-0.3V to (V + 0.3V) Operating Temperature Range CC Input Current MAX70 C .............................................................0C to +70C V ..................................................................................20mA MAX70 E ..........................................................-40C to +85C CC GND .................................................................................20mA MAX70 M .......................................................-55C to +125C Output Current (all outputs) ................................................20mA Junction Temperature......................................................+150C Continuous Power Dissipation (T = +70C) Storage Temperature Range .............................-65C to +150C A 8-Pin CERDIP (derate 8mW/C above +70C)..............640mW Lead Temperature (soldering, 10s) .................................+300C 8-Pin PDIP (derate 9.1mW/C above +70C).............727.3mW Note 1: The input-voltage limits on PFI, WDI, 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 (MAX70 P/R, MAX706AP/AR: V = 2.7V to 5.5V MAX70 S, MAX706AS: V = 3.0V to 5.5V MAX70 T, MAX706AT: V = 3.15V to CC CC CC 5.5V T = T = T to T , unless otherwise noted. Typical values are at T = T = +25C.) (Note 2) J A MIN MAX J A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MAX70 C 1.0 5.5 Supply Voltage Range V V CC MAX70 E/M 1.2 5.5 MAX706 C 90 200 MAX706 E/M 90 300 V < 3.6V CC MAX708 C 50 200 MAX708 E/M 50 300 Supply Current I A SUPPLY MAX706 C 135 350 MAX706 E/M 135 500 V < 5.5V CC MAX708 C 65 350 MAX708 E/M 65 500 MAX70 P/R, MAX706AP/AR 2.55 2.63 2.70 Reset Threshold (Note 3) V MAX70 S, MAX706AS 2.85 2.93 3.00 V RST (V Falling) CC MAX70 T, MAX706AT 3.00 3.08 3.15 Reset Threshold Hysteresis V 20 mV HYS (Note 3) MAX70 P/R, MAX706AP/AR V = 3.0V 140 200 280 CC Reset Pulse Width (Note 3) t MAX70 S, MAX706AS, V = 3.3V 140 200 280 ms RST CC V = 5V 200 CC RESET OUTPUT 0.8 x V V < V < 3.6V I = 500A OH RST(MAX) CC SOURCE V CC V V < V < 3.6V I = 1.2mA 0.3 OL RST(MAX) CC SINK Output-Voltage High I = V - RSOURCE CC (MAX70 R/S/T) V 4.5V < V < 5.5V V OH CC 800A 1.5 (MAX706AR/AS/AT) V 4.5V < V < 5.5V I = 3.2mA 0.4 OL CC SINK MAX70 C V = 1.0V, I = 50A 0.3 CC SINK V OL MAX70 E/M: V = 1.2V, I = 100A 0.3 CC SINK 2 MAX706P/R/S/T, MAX706AP/AR/AS/AT, MAX708R/S/T