MAX709 19-0136 Rev. 2 12/05 Power-Supply Monitor with Reset General Description Features The MAX709 provides a system reset during power-up, +5V, +3.3V, and +3V Versions power-down, and brownout conditions. When V falls CC No External Components below the reset threshold, RESET goes low and holds Low Cost the P in reset for 140ms min after V rises above the CC Precise Power-Down Reset Threshold threshold. 140ms Min Power-On Reset Delay The RESET output is guaranteed to be in the correct state with V down to 1V. The MAX709 provides Immune to Short Negative V Transients CC CC excellent circuit reliability and low cost by eliminating 8-Pin DIP, MAX, and SO Packages external components and adjustments when used with Low Supply Current: 35A - MAX709R/S/T +5V, +3.3V, or +3V powered systems. The MAX709 is 65A - MAX709L/M available 8-pin DIP, MAX, and SO packages. Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX709 CPA 0C to +70C 8 Plastic DIP MAX709 CUA 0C to +70C 8 MAX MAX709 CSA 0C to +70C 8 SO MAX709 C/D 0C to +70C Dice MAX709 EPA -40C to +85C 8 Plastic DIP Applications MAX709 EUA -40C to +85C 8 MAX MAX709 ESA -40C to +85C 8 SO Minimum Component Count, Devices are available in both leaded and lead-free packaging. Low-Cost Processor Systems Specify lead free by adding the + symbol at the end of the part number when ordering. *Dice are specified at T = +25C,DC parameters only. A Note: This part offers a choice of five different reset threshold voltages. Select the letter corresponding to the desired nominal reset threshold voltage, and insert it into the blank to complete the part number. RESET THRESHOLD SUFFIX VOLTAGE (V) L 4.65 Typical Operating Circuit M 4.40 T 3.08 S 2.93 R 2.63 V V Pin Configuration CC CC P TOP VIEW MAX709 RESET N.C. N.C. RESET 1 8 V CC 2 7 RESET MAX709 N.C. GND 3 6 GND GND N.C. 4 5 N.C. DIP/SO/MAX Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature.Power-Supply Monitor with Reset ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) Operating Temperature Ranges V ................................................ -0.3V to 6.0V MAX709 C ................................... 0C to +70C CC RESET.................................... -0.3V to (V + 0.3V) MAX709 E ............................... -40C to +85C CC Input Current, V .......................................... 20mA Storage Temperature Range .................. -65C to +160C CC Output Current, RESET ..................................... 20mA Lead Temperature (soldering, 10sec).................... +300C Rate-of-Rise, V ......................................... 100V/s CC Continuous Power Dissipation (T = +70C) A Plastic DIP (derate 9.09mW/C above +70C) ........727mW MAX (derate 4.10mW/C above +70C) ............. 330mW SO (derate 5.88mW/C above +70C)................. 471mW Stresses beyond those listed under Absolute Maximum Rating 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 = full range, T = T to T , unless otherwise noted.) CC A MIN MAX PARAMETER CONDITIONS MIN TYP MAX UNITS MAX709 C 1.0 5.5 V Range CC V MAX709 E 1.2 5.5 MAX709 C, V < 3.6V 35 85 CC MAX709R/S/T only MAX709 E, V < 3.6V 35 110 CC Supply Current (Note 1) A MAX709 C, V < 5.5V CC 65 150 All versions MAX709 E, V < 5.5V 65 200 CC MAX709L 4.50 4.65 4.75 MAX709M 4.25 4.40 4.50 RESET Threshold, V MAX709T 3.00 3.08 3.15 V TH MAX709S 2.85 2.93 3.00 MAX709R 2.55 2.63 2.70 V to RESET Delay V = reset threshold max to reset threshold min CC CC 20 s Reset Active Timeout Period V = reset threshold max, V rising 140 280 560 ms CC CC I = 1.2mA, V = reset threshold min, SINK CC 0.3 MAX709R/S/T only I = 3.2mA, V = reset threshold min, SINK CC 0.4 MAX709L/M only I = 50A, V 1.0V, MAX709 C 0.3 SINK CC RESET Output Voltage V I = 100A, V 1.2V, MAX709 E 0.4 SINK CC I = 500A, V reset threshold max, SOURCE CC 0.8 x V CC MAX709R/S/T only I = 800A, V reset threshold max, SOURCE CC V - 1.5 CC MAX709L/M only Note 1: Supply current is measured with V = 3.6V for MAX709R/S/T, and V = 5.5V for all versions. CC CC 2 MAX709