MAX6315 19-2000 Rev 3 12/05 Open-Drain SOT P Reset Circuit General Description Features The MAX6315 low-power CMOS microprocessor (P) Small SOT143 Package supervisory circuit is designed to monitor power sup- Open-Drain RESET Output Can Exceed V CC plies in P and digital systems. It provides excellent cir- Precision, Factory-Set V Reset Thresholds: CC cuit reliability and low cost by eliminating external 100mV Increments from 2.5V to 5V components and adjustments. The MAX6315 also pro- vides a debounced manual reset input. Four Reset Timeout Periods Available: 1ms, 20ms, 140ms, or 1120ms (minimum) This device performs a single function: it asserts a reset signal whenever the V supply voltage falls below a CC Immune to Short V Transients CC preset threshold or whenever manual reset is asserted. 5A Supply Current Reset remains asserted for an internally programmed Pin-Compatible with MAX811 interval (reset timeout period) after V has risen above CC Guaranteed Over Temperature the reset threshold or manual reset is deasserted. The MAX6315s open-drain RESET output can be pulled up Ordering Information to a voltage higher than V . CC The MAX6315 comes with factory-trimmed reset thresh- NOMINAL MIN t TOP RP PART old voltages in 100mV increments from 2.5V to 5V. V (V) (ms) MARK TH Preset timeout periods of 1ms, 20ms, 140ms, and MAX6315US50D1-T 5.00 1 FX 1120ms (min) are also available. The device comes in a SOT143 package. The MAX6315 is available in a SOT143 package, -40C to +125C temperature range. For microcontrollers (Cs) and Ps with bidirectional The first two letters in the package top mark identify the part, reset pins, see the MAX6314 data sheet. while the remaining two letters are the lot tracking code. Devices are available in both leaded and lead-free packaging. Applications Specify lead-free by replacing -T with +T when ordering. Computers Note: All devices available in tape-and-reel only. Contact fac- tory for availability. Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery-Powered Equipment Ordering Information continued at end of data sheet. Pin Configuration Typical Operating Circuit VCC TOP VIEW V CC LASER- GND 1 4 V CC TRIMMED RESISTORS MAX6315 P RESET RESET RESET 2 3 MR RESET CIRCUITRY MR SOT143 MAX6315 GND 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.Open-Drain SOT P Reset Circuit ABSOLUTE MAXIMUM RATINGS V ........................................................................-0.3V to +6.0V Continuous Power Dissipation (T = +70C) CC A RESET....................................................................-0.3V to +6.0V SOT143 (derate 4mW/C above +70C)........................320mW All Other Pins..............................................-0.3V to (V + 0.3V) Operating Temperature Range .........................-40C to +125C CC Input Current (V ).............................................................20mA Storage Temperature Range .............................-65C to +160C CC Output Current (RESET)......................................................20mA Lead Temperature (soldering, 10s) .................................+300C Rate of Rise (V ) ...........................................................100V/s CC 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 = +2.5V to +5.5V, T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C.) CC A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range V T = -40C to +85C 1.0 5.5 V CC A V = 5.5V, no load (-40C to +85C) 512 CC V = 5.5V, no load (-40C to +125C) 15 CC V Supply Current I A CC CC V = 3.6V, no load (-40C to +85C) 410 CC V = 3.6V, no load (-40C to +125C) 12 CC T = +25C V - 1.8% V V + 1.8% A TH TH TH Reset Threshold (Note 1) V T = -40C to +85C V - 2.5% V + 2.5% V TH A TH TH T = -40C to +125C V - 3.5% V + 3.5% A TH TH Reset Threshold Tempco V /C 60 ppm/C TH V to Reset Delay V = falling at 1mV/s 35 s CC CC MAX6315US D1-T (-40C to +85C) 1 1.4 2 MAX6315US D1-T (-40C to +125C) 0.8 2.4 MAX6315US D2-T (-40C to +85C) 20 28 40 MAX6315US D2-T (-40C to +125C) 16 48 Reset Timeout Period t ms RP MAX6315US D3-T (-40C to +85C) 140 200 280 MAX6315US D3-T (-40C to +125C) 112 336 MAX6315US D4-T (-40C to +85C) 1120 1570 2240 MAX6315US D4-T (-40C to +125C) 896 2688 MANUAL RESET INPUT V 0.8 IL V > 4.0V TH V 2.4 IH MR Input Threshold V V 0.3 x V IL CC V < 4.0V TH V 0.7 x V IH CC MR Minimum Input Pulse 1 s MR Glitch Rejection 100 ns MR to Reset Delay 500 ns MR Pull-Up Resistance 32 63 100 k V > 4.25V, I = 3.2mA 0.4 CC SINK V > 2.5V, I = 1.2mA 0.3 CC SINK V V RESET Output Voltage OL V > 1.2V, I = 0.5mA 0.3 CC SINK V > 1.0V, I = 80A 0.3 CC SINK 1 A RESET Output Leakage Current V > V , RESET deasserted CC TH Note 1: The MAX6315 monitors V through an internal factory-trimmed voltage-divider that programs the nominal reset threshold. CC Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see the Ordering Information). 2 MAX6315