MAX814/MAX815/MAX816 19-0412 Rev 1 12/05 1% Accuracy, Low-Power, +3V and +5V P Supervisory Circuits General Description Features The MAX814/MAX815/MAX816 are high-accuracy 1% Worst-Case Reset Threshold Accuracy microprocessor (P) supervisory circuits that provide 4.8V, 4.7V, 4.55V, 3.03V, or Adjustable Reset power-on reset, watchdog, and power-fail functions. Thresholds They eliminate manual trimming and improve reliability 1% Low-Line Threshold Accuracy (MAX814) in critical applications needing high-accuracy reset thresholds. The RESET output is guaranteed to be in 60mV Above Reset Threshold the correct state for V down to 1V. The reset com- CC 200ms Reset Time Delay parator is designed to ignore fast transients on V . CC Active-Low RESET Output Reset thresholds are available for operation with a vari- Active-High RESET Output (MAX814/MAX816) ety of 3V and 5V supply voltages. 75A Max Supply Current A 75A maximum supply current makes the MAX814/ Guaranteed RESET Valid to V = 1V MAX815/MAX816 ideal for use in portable equipment. All CC three devices are available in 8-pin DIP and SO pack- Manual Reset Input ages. See the Selector Table for a review of features. 2% Power-Fail Comparator Independent Watchdog with 1.56sec Timeout Selector Table (MAX815) Power-Supply Glitch Immunity FEATURE MAX814 MAX815 MAX816 8-Pin SO and DIP Packages RESET Output RESET Output Manual Reset Ordering Information V Reset Voltage K, L, N, T K, L, N, T Adjustable CC PART* TEMP RANGE PIN-PACKAGE Power-Fail Monitor MAX814 CPA 0C to +70C 8 PDIP Low-Line Detector *The MAX814/MAX815 offer a choice of reset threshold voltages. Watchdog Circuit From the Reset Trip Threshold table, select the suffix corre- sponding to the desired threshold and insert it into the blank to complete the part number. Applications Devices are available in both leaded and lead-free packaging. Medical Equipment Specify lead free by adding the + symbol at the end of the part Controllers number when ordering. Intelligent Instruments Critical P Power Monitoring Ordering Information continued at end of data sheet. Portable/Battery-Powered Equipment Reset Trip Thresholds table appears at end of data sheet. Set-Top Boxes Pin Configurations TOP VIEW MR 1 8 RESET MR 1 8 WDO MR 1 8 RESET 2 7 RESET 2 7 RESET 2 7 RESET V V V CC CC CC MAX814 MAX815 MAX816 GND 3 6 LOW LINE GND 3 6 WDI GND 3 6 RESET IN PFI 4 5 PFO PFI 4 5 PFO PFI 4 5 PFO DIP/SO DIP/SO DIP/SO 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.1% Accuracy, Low-Power, +3V and +5V P Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect GND) Operating Temperature Ranges V ....................................................................-0.3V to +6.0V Commercial.........................................................0C to +70C CC All Other Pins (Note 1)........................... -0.3V to (V + 0.3V) Extended...........................................................-40C to +85C CC Terminal Current (PFI, RESET IN, MR)................................10mA Storage Temperature Range .............................-65C to +125C Terminal Current (all other pins) .........................................20mA Continuous Power Dissipation (T = +25C) A Plastic DIP (derate 9.09mW/C above +70C) ............727mW SO (derate 5.88mW/C above +70C).........................471mW 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, +5V Parts (MAX814/MAX815K, L, N) (V = 4.85V to 5.5V for MAX814K/MAX815K, V = 4.75V to 5.5V for MAX814L/MAX815L, V = 4.60V to 5.5V for MAX814N/ CC CC CC MAX815N, T = T to T , unless otherwise noted.) A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MAX814 C, MAX815 C 1.0 5.5 Operating Voltage Range V V CC MAX814 E, MAX815 E 1.2 5.5 MAX814 C, MAX815 C 75 Supply Current I A SUPPLY MAX814 E, MAX815 E 85 MAX814K, MAX815K 4.75 4.85 Reset Threshold V MAX814L, MAX815L 4.65 4.75 V RT MAX814N, MAX815N 4.50 4.60 Reset Threshold Hysteresis 0 mV Reset Pulse Width t 140 200 250 ms RS V I = 800A V -1.5 OH SOURCE CC RESET Output Voltage MAX814 V V I = 3.2mA 0.4 OL SINK V I = 800A V -1.5 OH SOURCE CC I = 3.2mA 0.4 SINK RESET, WDO, PFO, LOW LINE V Output Voltage V MAX814 C/MAX815 C, V = 1.0V, I = 50A 0.3 OL CC SINK MAX814 E/MAX815 E, V = 1.2V, I = 100A 0.3 CC SINK Watchdog Timeout Period t MAX815 1.12 2.00 s WD WDI Pulse Width t MAX815 50 ns WP Low 0.8 WDI Input Threshold V MAX815, V = 5.0V V WDI CC High 2.4 WDI Input Current I WDI = V or WDI = 0V -1.0 1.0 A WDI CC MR to WDO High Delay t MAX815 (Note 1) 1 s WDO MAX814 C, V falling 50 70 LOW LINE to RESET Differential CC V mV LL Threshold MAX814 E, V falling 48 73 CC MAX814K, V rising 4.93 CC LOW LINE Threshold V MAX814L, V rising 4.83 V LLT CC MAX814N, V rising 4.68 CC 2 MAX814/MAX815/MAX816