Click here for production status of specific part numbers. MAX6340/MAX6421 Low-Power, SC70/SOT P Reset Circuits MAX6426 with Capacitor-Adjustable Reset Timeout Delay General Description Benefits and Features The MAX6340/MAX6421MAX6426 low-power micropro- Monitor System Voltages from 1.6V to 5V cessor supervisor circuits monitor system voltages from Capacitor-Adjustable Reset Timeout Period 1.6V to 5V. These devices perform a single function: they Low Quiescent Current (1.6A typ) assert a reset signal whenever the V supply voltage CC Three RESET Output Options falls below its reset threshold. The reset output remains Push-Pull RESET asserted for the reset timeout period after V rises CC Push-Pull RESET above the reset threshold. The reset timeout is externally Open-Drain RESET set by a capacitor to provide more flexibility. Guaranteed Reset Valid to V = 1V CC The MAX6421/MAX6424 have an active-low, push- Immune to Short V Transients pull reset output. The MAX6422 has an active-high, push- CC pull reset output and the MAX6340/MAX6423/ MAX6425/ Small 4-Pin SC70, 4-Pin SOT143, and 5-Pin SOT23 MAX6426 have an active-low, open-drain reset output. Packages The MAX6421/MAX6422/MAX6423 are offered in 4-pin MAX6340 Pin Compatible with LP3470 SC70 or SOT143 packages. The MAX6340/MAX6424/ MAX6424/MAX6425 Pin Compatible with MAX6425/MAX6426 are available in 5-pin SOT23-5 NCP300NCP303, MC33464/MC33465, packages. S807/S808/S809, and RN5VD MAX6426 Pin Compatible with PST92XX Applications Portable Equipment AEC-Q100 Qualified (MAX6340UK31/V+T) Battery-Powered Computers/Controllers Automotive Typical Operating Circuit, Selector Guide, and Ordering Medical Equipment Information appear at end of data sheet. Intelligent Instruments Embedded Controllers Critical P Monitoring Set-Top Boxes Computers Pin Configurations TOP VIEW V CC 1 4 RESET MAX6421X (RESET) MAX6422X MAX6423X SRT GND 2 3 SC70 ( ) ARE FOR THE MAX6422 Pin Configurations continued at end of data sheet. 19-2440 Rev 10 5/18MAX6340/MAX6421 Low-Power, SC70/SOT P Reset Circuits MAX6426 with Capacitor-Adjustable Reset Timeout Delay Absolute Maximum Ratings All Voltages Referenced to GND Continuous Power Dissipation (T = +70C) A V .......................................................................-0.3V to +6.0V 4-Pin SC70 (derate 3.1mW/C above +70C) .............245mW CC SRT, RESET, RESET (push-pull) ............. -0.3V to (V + 0.3V) 4-Pin SOT143 (derate 4mW/C above +70C) ...........320mW CC RESET (open drain) .............................................-0.3V to +6.0V 5-Pin SOT23 (derate 7.1mW/C above +70C) ..........571mW Input Current (all pins) ......................................................20mA Operating Temperature Range ......................... -40C to +125C Output Current (RESET, RESET) ....................................20mA Storage Temperature Range ..........................-65C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) .................................+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 = 1V to 5.5V, T = T to T , unless otherwise specified. Typical values are at V = 5V and T = +25C.) (Note 1) CC A MIN MAX CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V 1.0 5.5 V CC V 5.0V 2.5 4.2 CC V 3.3V 1.9 3.4 Supply Current I A CC CC VCC 2.0V 1.6 2.5 T = +25C V - 1.5% V + 1.5% A TH TH V Reset Threshold Accuracy V V CC TH T = -40C to +125C V - 2.5% V + 2.5% A TH TH Hysteresis V 4 x V mV HYST TH V to Reset Delay t V falling at 1mV/s 80 s CC RD CC C = 1500pF 3.00 4.375 5.75 SRT Reset Timeout Period t ms RP C = 0 0.275 SRT V Ramp Current I V = 0 to 0.65V V = 1.6V to 5V 240 nA SRT RAMP SRT CC V V Ramp Threshold V = 1.6V to 5V (V rising) 0.65 V TH-RAMP SRT CC RAMP RAMP Threshold Hysteresis V falling threshold 33 mV RAMP V 1.0V, I = 50A 0.3 CC SINK RESET Output Voltage Low V V 2.7V, I = 1.2mA 0.3 V OL CC SINK V 4.5V, I = 3.2mA 0.4 CC SINK V 1.8V, I = 200A 0.8 x V CC SOURCE CC RESET Output Voltage High, V V 2.25V, I = 500A 0.8 x V V OH CC SOURCE CC Push-Pull V 4.5V, I = 800A 0.8 x V CC SOURCE CC RESET Output Leakage Current, I V > V , reset not asserted 1.0 A LKG CC TH Open-Drain V 1.0V, I = 1A 0.8 x V CC SOURCE CC V 1.8V, I = 150A 0.8 x V CC SOURCE CC RESET Output Voltage High V V OH V 2.7V, I = 500A 0.8 x V CC SOURCE CC V 4.5V, I = 800A 0.8 x V CC SOURCE CC V 1.8V, I = 500A 0.3 CC SINK RESET Output Voltage Low V V 2.7V, I = 1.2mA 0.3 V OL CC SINK V 4.5V, I = 3.2mA 0.4 CC SINK Note 1: Devices production tested at +25C. Overtemperature limits are guaranteed by design. Maxim Integrated 2 www.maximintegrated.com