MAX811/MAX812 19-0411 Rev 4 12/05 4-Pin P Voltage Monitors with Manual Reset Input General Description Features The MAX811/MAX812 are low-power microprocessor Precision Monitoring of 3V, 3.3V, and 5V (P) supervisory circuits used to monitor power sup- Power-Supply Voltages plies in P and digital systems. They provide excellent 6A Supply Current circuit reliability and low cost by eliminating external components and adjustments when used with 5V- 140ms Min Power-On Reset Pulse Width powered or 3V-powered circuits. The MAX811/MAX812 RREESSEETT Output (MAX811), RESET Output (MAX812) also provide a debounced manual reset input. Guaranteed Over Temperature These devices perform a single function: They assert a reset signal whenever the V supply voltage falls Guaranteed RREESSEETT Valid to V = 1V (MAX811) CC CC below a preset threshold, keeping it asserted for at Power-Supply Transient Immunity least 140ms after V has risen above the reset thresh- CC old. The only difference between the two devices is that No External Components the MAX811 has an active-low RESET output (which is 4-Pin SOT143 Package guaranteed to be in the correct state for V down to CC 1V), while the MAX812 has an active-high RESET out- Ordering Information put. The reset comparator is designed to ignore fast PART* TEMP RANGE PIN-PACKAGE transients on V . Reset thresholds are available for CC operation with a variety of supply voltages. MAX811 EUS-T -40C to +85C 4 SOT143 Low supply current makes the MAX811/MAX812 ideal MAX812 EUS-T -40C to +85C 4 SOT143 for use in portable equipment. The devices come in a *This part offers a choice of five different reset threshold volt- 4-pin SOT143 package. ages. Select the letter corresponding to the desired nominal reset threshold voltage, and insert it into the blank to complete Applications the part number. Devices are available in both leaded and lead-free packaging. Computers Specify lead-free by replacing -T with +T when ordering. Controllers RESET THRESHOLD Intelligent Instruments SUFFIX VOLTAGE (V) Critical P and C Power Monitoring L 4.63 Portable/Battery-Powered Equipment M 4.38 T 3.08 S 2.93 R 2.63 Typical Operating Circuit Pin Configuration TOP VIEW V CC GND 1 4 V CC V V CC CC MAX811 P MAX811 MAX812 MAX812 RESET RESET INPUT (RESET) MR (RESET) RESET 2 3 MR GND GND SOT143 PUSHBUTTON ( ) ARE FOR MAX812 ( ) ARE FOR MAX812 SWITCH NOTE: SEE LAST PAGE FOR MARKING INFORMATION. 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.4-Pin P Voltage Monitors with Manual Reset Input ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) Continuous Power Dissipation (T = +70C) A V ......................................................................-0.3V to 6.0V SOT143 (derate 4mW/C above +70C) .......................320mW CC All Other Inputs.......................................-0.3V to (V + 0.3V) Operating Temperature Range ...........................-40C to +85C CC Input Current, V MR .......................................................20mA Storage Temperature Range .............................-65C to +160C CC, Output Current, RESET or RESET.......................................20mA Lead Temperature (soldering, 10sec) .............................+300C 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 = 5V for L/M versions, V = 3.3V for T/S versions, V = 3V for R version, T = -40C to +85C, unless otherwise noted. CC CC CC A Typical values are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS T = 0C to +70C 1.0 5.5 A Operating Voltage Range V V CC T = -40C to +85C 1.2 A MAX81 L/M, V = 5.5V, I = 0 615 CC OUT Supply Current I A CC MAX81 R/S/T, V = 3.6V, I = 0 2.7 10 CC OUT T = +25C 4.54 4.63 4.72 A MAX81 L T = -40C to +85C 4.50 4.75 A T = +25C 4.30 4.38 4.46 A MAX81 M T = -40C to +85C 4.25 4.50 A T = +25C 3.03 3.08 3.14 A Reset Threshold V MAX81 T V TH T = -40C to +85C 3.00 3.15 A T = +25C 2.88 2.93 2.98 A MAX81 S T = -40C to +85C 2.85 3.00 A T = +25C 2.58 2.63 2.68 A MAX81 R T = -40C to +85C 2.55 2.70 A Reset Threshold Tempco 30 ppm/C V = 125mV, MAX81 L/M 40 OD V to Reset Delay (Note 2) s CC V = 125mV, MAX81 R/S/T 20 OD Reset Active Timeout Period t V = V 140 560 ms RP CC TH(MAX) MR Minimum Pulse Width t 10 s MR 100 ns MR Glitch Immunity (Note 3) MR to Reset Propagation Delay t 0.5 s MD (Note 2) V 2.3 IH V > V , MAX81 L/M CC TH(MAX) V 0.8 IL MR Input Threshold V V 0.7 x V IH CC V > V , MAX81 R/S/T CC TH(MAX) V 0.25 x V IL CC MR Pull-Up Resistance 10 20 30 k V I = 150A, 1.8V < V < V 0.8 x V OH SOURCE CC TH(MIN) CC MAX812R/S/T only, I = 1.2mA, SINK 0.3 RESET Output Voltage V = V CC TH(MAX) V (MAX812) V OL MAX812L/M only, I = 3.2mA, SINK 0.4 V = V CC TH(MAX) 2 MAX811/MAX812