Click here to ask about the production status of specific part numbers. MAX703/MAX704 Low-Cost Microprocessor Supervisory Circuits with Battery Backup General Description Features Battery-Backup Power Switching The MAX703/MAX704 microprocessor (P) supervisory circuits reduce the complexity and number of components Precision Supply-Voltage Monitor required for power-supply monitoring and battery control 4.65V (MAX703) functions in P systems. These devices significantly 4.40V (MAX704) improve system reliability and accuracy compared to that 200ms Reset Pulse Width obtained with separate ICs or discrete components. Debounced TTL/CMOS-Compatible Manual Reset Input The MAX703/MAX704 are available in 8-pin DIP and SO 200A Quiescent Current packages and provide four functions: 50nA Quiescent Current in Battery-Backup Mode 1) An active-low reset during power-up, power-down, and Voltage Monitor for Power-Fail or Low-Battery brownout conditions. Warning 2) Battery-backup switching for CMOS RAM, CMOS Ps, 8-Pin DIP and SO Packages or other low-power logic circuitry. Guaranteed RESET Assertion to V = 1V CC 3) A 1.25V threshold detector for power-fail warning, Ordering Information low-battery detection, or for monitoring a power supply other than +5V. PART TEMP RANGE PIN-PACKAGE 4) An active-low manual reset input. MAX703C/D 0C to +70C Dice* The MAX703 and MAX704 differ only in their supply- MAX703CPA 0C to +70C 8 PDIP voltage monitor levels. The MAX703 generates a reset MAX703CSA 0C to +70C 8 SO when the supply drops below 4.65V, while the MAX704 MAX703EPA -40C to +85C 8 PDIP generates a reset below 4.40V. MAX703ESA -40C to +85C 8 SO MAX703MJA -55C to +125C 8 CERDIP** Applications MAX704C/D 0C to +70C Dice* Computers Controllers MAX704CPA 0C to +70C 8 PDIP Intelligent Instruments MAX704CSA 0C to +70C 8 SO Critical P Power Monitoring MAX704EPA -40C to +85C 8 PDIP MAX704ESA -40C to +85C 8 SO Typical Operating Circuit MAX704MJA -55C to +125C 8 CERDIP** *Dice are tested at T = +25C only. A **Contact factory for availability and processing to MIL-STD-883. UNREGULATED DC REGULATED +5V MICROPROCESSOR Devices in PDIP and SO packages are available in both leaded V CC and lead(Pb)-free packaging. Specify lead(Pb)-free by adding R1 0.1F V the + symbol at the end of the part number when ordering. CC RESET RESET Lead(Pb)-free not available for CERDIP package. PFO PFI NMI GND Pin Configuration 3.6V MAX703 LITHIUM MAX704 BATTERY R2 BUS TOP VIEW V BATT V 1 8 V OUT BATT MR V OUT V CC GND V 2 7 RESET CC MAX703 CMOS RAM MAX704 GND 3 6 MR PUSHBUTTON GND SWITCH PFI 4 5 PFO DIP/SO 19-0130 Rev 4 3/20MAX703/MAX704 Low-Cost Microprocessor Supervisory Circuits with Battery Backup Absolute Maximum Ratings Terminal Voltage (with respect to GND) Rate-of-Rise V , V ...............................................100V/s BATT CC V ...................................................................-0.3V to +6.0V Operating Temperature Range CC V ...............................................................-0.3V to +6.0V C Suffix ...............................................................0C to +70C BATT All Other Inputs (Note 1)....................... -0.3V to (V + 0.3V) E Suffix ........................................................... -40C to +85C CB Input Current M Suffix ......................................................... -55C to +125C V ..............................................................................200mA Continuous Power Dissipation (T = +70C) CC A V .............................................................................50mA 8-Pin PDIP (derated 9.09mW/C above +70C) .........727mW BATT GND ................................................................................20mA 8-Pin SO (derated 5.88mW/C above +70C) .............471mW Output Current 8-Pin CERDIP (derated 8.00mW/C above +85C) ....640mW V ..............................Short-Circuit Protected for Up to 10s Storage Temperature Range ............................ -65C to +160C OUT All Other Outputs ............................................................20mA Lead Temperature (soldering, 10s) .................................+300C Note 1: V is the greater of V and V . The input voltage limits on PFI and MR may be exceeded if the current into these CB CC BATT pins is limited to 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 (V = +4.75V to +5.5V for MAX703, V = +4.5V to +5.5V for MAX704, V = 2.8V, T = T to T , unless otherwise noted.) CC CC BATT A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range V , CC (Note 2) 0 5.5 V V BATT MAX70 C 200 350 Supply Current (Excluding I ) I A OUT SUPPLY MAX70 E/M 200 500 T = +25C 0.05 1.0 I in Battery-Backup Mode V = 0V, A SUPPLY CC A (Excluding I ) V = 2.8V OUT BATT T = T to T 5.0 A MIN MAX T = +25C -0.10 +0.02 V Standby Current 5.5V > V > A BATT CC A (Note 3) V + 0.2V T = T to T -1.00 +0.02 BATT A MIN MAX V - V - CC CC I = 5mA OUT 0.05 0.025 V Output V OUT V - V - CC CC I = 50mA OUT 0.5 0.25 V V BATT BATT V in Battery-Backup Mode I = 250A, V < V - 0.2V V OUT OUT CC BATT - 0.1 - 0.02 Power-up 20 Battery Switch Threshold (V - CC V < V mV CC RST V ) Power-down -20 BATT Battery Switchover Hysteresis 40 mV MAX703 4.50 4.65 4.75 RESET Threshold V V RST MAX704 4.25 4.40 4.50 RESET Threshold Hysteresis 40 mV RESET Pulse Width t 140 200 280 ms RST V - CC V I = 800A OH SOURCE 1.5 I = 3.2mA 0.4 SINK RESET Output Voltage V MAX70 C, V = 1V, V falling, CC CC 0.3 V V = 0V, I = 50A OL BATT SINK MAX70 E/M, V = 1.2V, V falling, CC CC 0.3 V = 0V, I = 100A BATT SINK Maxim Integrated 2 www.maximintegrated.com