MAX6335/MAX6336/MAX6337 19-1412 Rev 2 12/05 4-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits with Manual Reset General Description Features The MAX6335/MAX6336/MAX6337 microprocessor (P) Ultra-Low 0.7V Operating Supply Voltage supervisory circuits monitor the power supplies in 1.8V Low 3.3A Supply Current to 3.3V P and digital systems. They increase circuit reli- ability and reduce cost by eliminating external compo- Precision Monitoring of 1.8V and 2.5V Power- nents and adjustments. They also feature a debounced Supply Voltages manual-reset input. Reset Thresholds Available from 1.6V to 2.5V, These devices perform a single function: they assert a in Approximately 100mV Increments reset signal whenever the V supply voltage declines CC below a preset threshold or whenever manual reset is Debounced Manual Reset asserted. Reset remains asserted for a preset timeout Fully Specified over Temperature period after V has risen above the reset threshold or CC after manual reset is deasserted. The only difference Three Power-On Reset Pulse Widths Available among the three devices is their output. The MAX6336 (1ms min, 20ms min, 100ms min) (push/pull) and MAX6337 (open-drain) have an active- Low Cost low RESET output, while the MAX6335 (push/pull) has an active-high RESET output. The MAX6335/MAX6336 Three Available Output Structures: Push/Pull are guaranteed to be in the correct state for V down CC RESET, Push/Pull RESET, Open-Drain RESET to 0.7V. The MAX6337 is guaranteed to be in the cor- Guaranteed RESET/RESET Valid to V = 0.7V rect state for V down to 1.0V. CC CC (MAX6335/MAX6336) The reset comparator in these ICs is designed to ignore fast transients on V . Reset thresholds are factory- CC Power-Supply Transient Immunity trimmable between 1.6V and 2.5V, in approximately No External Components 100mV increments. There are 15 standard versions available (2500 piece minimum-order quantity) contact 4-Pin SOT143 Package the factory for availability of nonstandard versions Pin Compatible with MAX811/MAX812 and (10,000 piece minimum-order quantity). For space-criti- MAX6314/MAX6315 cal applications, the MAX6335/MAX6336/MAX6337 come packaged in a 4-pin SOT143. Applications Ordering Information Pentium II Computers PART* TEMP. RANGE PIN-PACKAGE Computers MAX6335US D -T -40C to +125C 4 SOT143 MAX6336US D -T -40C to +125C 4 SOT143 Controllers MAX6337US D -T -40C to +125C 4 SOT143 Intelligent Instruments * These devices are available in factory-set V reset thresh- CC Critical P/C Power Monitoring olds from 1.6V to 2.5V, in approximately 0.1V increments. Portable/Battery-Powered Equipment Choose the desired reset threshold suffix from Table 1 and insert it in the blanks following US in the part number. Automotive Factory-programmed reset timeout periods are also available. Insert the number corresponding to the desired nominal reset timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in the blank following D in the part number. There are 15 stan- dard versions with a required order increment of 2500 pieces. Sample stock is generally held on the standard versions only (see Selector Guide). Contact the factory for availability of non- Typical Operating Circuit and Pin Configuration appear standard versions (required order increment is 10,000 pieces). at end of data sheet. All devices available in tape-and-reel only. Devices are available in both leaded and lead-free packaging. Selector Guide appears at end of data sheet. Specify lead-free by replacing -T with +T when ordering. Pentium II is a trademark of Intel Corp. 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, Ultra-Low-Voltage, Low-Power P Reset Circuits with Manual Reset ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) Continuous Power Dissipation (T = +70C) A V ......................................................................-0.3V to +6V SOT143 (derate 4mW/C above +70C) .....................320mW CC Push/Pull RESET or RESET, MR ............-0.3V to (V + 0.3V) Operating Temperature Range .........................-40C to +125C CC Storage Temperature Range .............................-65C to +160C Open-Drain RESET ..............................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C Input Current (V ).............................................................20mA CC Output Current (RESET, RESET).........................................20mA 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 = full range, MR = V or unconnected, T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C and CC CC A A V = 3V, reset not asserted.) CC PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MAX6335/MAX6336 0.7 5.5 T = 0C to +85C A MAX6337 1.0 5.5 MAX6335/MAX6336 0.78 5.5 Supply Voltage Range V T = -40C to +85C V CC A MAX6337 1.2 5.5 MAX6335/MAX6336 T = -40C to +125C 1.2 5.5 A MAX6337 V = 1.8V 3.0 6.0 CC Supply Current I No load A CC 3.3 7.0 V = 2.5V CC V V TH - TH + T = +25C V A TH 1.8% 1.8% MAX633 US D -T, Reset Threshold V V TH Table 1 V V TH - TH + T = -40C to +125C V A TH 3% 3% V Falling Reset Delay V falling at 10V/ms 24 s CC CC MAX633 US D1-T 1 1.5 2 Reset Active Timeout Period t MAX633 US D2-T 20 30 40 ms RP MAX633 US D3-T 100 150 200 I = 50A, V 1.0V 0.4 SINK RESET Output Low Voltage Reset CC V V OL (MAX6336/MAX6337) asserted I = 500A, V 1.8V 0.3 SINK CC I = 200A, V 1.8V 0.8V SOURCE CC CC RESET Output High Voltage Reset not V V OH (MAX6336) asserted I = 500A, V 2.7V 0.8V SOURCE CC CC I = 1A, V 1.0V 0.8V SOURCE CC CC Reset V V OH asserted I = 200A, V 1.8V 0.8V SOURCE CC CC RESET Output Voltage (MAX6335) I = 500A, V 1.8V 0.3 Reset not SINK CC V V OL asserted I = 1.2mA, V 2.7V 0.3 SINK CC 1 s MR Minimum Pulse Width MR Glitch Immunity V = 2.6V 160 ns CC MR Reset Delay V = 2.6V 0.42 s CC MR Threshold V 0.3V 0.7V V MR CC CC MR Pull-Up Resistance 12 20 30 k RESET Output Leakage V > V , RESET deasserted 0.5 A CC TH Current (MAX6337) 2 MAX6335/MAX6336/MAX6337