MAX6887/MAX6888 19-0291 Rev 2 2/10 Hex/Quad, Power-Supply Supervisory Circuits General Description Features The MAX6887/MAX6888 multivoltage supply supervi- Hex/Quad Voltage Detectors sors provide several voltage-detector inputs, one watch- Undervoltage and Overvoltage Thresholds dog input, and three outputs. Each voltage-detector input offers a factory-set undervoltage and overvoltage 1% Threshold Accuracy threshold. Manual reset and margin disable inputs offer Margining Disable and Manual Reset Input additional flexibility. Watchdog Timer The MAX6887 offers six voltage-detector inputs, while the MAX6888 offers four inputs. Output RESET asserts Open-Drain RESET, OV, and WDO Outputs when any input voltage drops below its respective 180ms (min) Reset Timeout Period undervoltage threshold or manual reset MR is asserted. Output OV asserts when any input voltage exceeds its Few External Components respective overvoltage threshold. Monitor standard Small 5mm x 5mm, 16-Pin Thin QFN Packages supply voltages listed in the Selector Guide. The MAX6887/MAX6888 offer a watchdog timer with an initial and normal timeout periods of 102.4s and 1.6s, respectively. Watchdog output WDO asserts when the Ordering Information watchdog timer expires. Connect WDO to manual reset input MR to generate resets when the watchdog timer PART TEMP RANGE PIN-PACKAGE expires. RESET, OV, and WDO are active-low, open- MAX6887 ETE+ -40C to +85C 16 Thin QFN-EP* drain outputs. MAX6888 ETE+ -40C to +85C 16 Thin QFN-EP* The MAX6887/MAX6888 are available in a 5mm x 5mm Note: Insert the desired letter from the Selector Guide into the x 0.8mm, 16-pin thin QFN package and operate over blank to complete the part number. the extended -40C to +85C temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. Applications *EP = Exposed pad. Multivoltage Systems Telecom Networking Pin Configurations and Typical Operating Circuit appear at Servers/Workstations/Storage Systems end of data sheet. Selector Guide NOMINAL INPUT VOLTAGE (V)* TOL NOMINAL INPUT VOLTAGE (V)* TOL PART PART (%) (%) IN1 IN2 IN3 IN4 IN5 IN6 IN1 IN2 IN3 IN4 IN5 IN6 MAX6887AETE 5.0 3.3 2.5 1.8 Adj Adj 5 MAX6887IETE 5.0 3.3 2.5 1.8 Adj Adj 10 MAX6887BETE 5.0 3.3 2.5 Adj Adj Adj 5 MAX6887JETE 5.0 3.3 2.5 Adj Adj Adj 10 MAX6887CETE 5.0 3.3 1.8 Adj Adj Adj 5 MAX6887KETE 5.0 3.3 1.8 Adj Adj Adj 10 MAX6887DETE 3.3 2.5 1.8 1.5 Adj Adj 5 MAX6887LETE 3.3 2.5 1.8 1.5 Adj Adj 10 MAX6887EETE 3.3 2.5 1.8 Adj Adj Adj 5 MAX6887METE 3.3 2.5 1.8 Adj Adj Adj 10 MAX6887FETE 3.3 2.5 1.5 Adj Adj Adj 5 MAX6887NETE 3.3 2.5 1.5 Adj Adj Adj 10 MAX6887GETE 3.3 2.5 Adj Adj Adj Adj 5 MAX6887OETE 3.3 2.5 Adj Adj Adj Adj 10 MAX6887HETE 3.3 1.8 Adj Adj Adj Adj 5 MAX6887PETE 3.3 1.8 Adj Adj Adj Adj 10 MAX6887QETE Adj Adj Adj Adj Adj Adj 5 MAX6887RETE Adj Adj Adj Adj Adj Adj 10 *See thresholds options tables (Tables 1 and 2) for actual undervoltage and overvoltage thresholds. Selector Guides continued at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Hex/Quad, Power-Supply Supervisory Circuits ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) Maximum Junction Temperature .....................................+150C IN1IN6, V , RESET, OV, WDO .............................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C CC WDI, MR, MARGIN ...................................................-0.3V to +6V Storage Temperature Range .............................-65C to +150C BP.............................................................................-0.3V to +3V Lead Temperature (soldering, 10s) .................................+300C Input/Output Current (all pins)..........................................20mA Continuous Power Dissipation (T = +70C) A 16-Pin 5mm x 5mm Thin QFN (derate 20.8mW/C above +70C)..............................1667mW 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 V or V = 2.7V to 5.8V, WDI = GND, MARGIN = MR = BP, T = -40C to +85C, unless otherwise noted. Typical values are IN1 IN4 CC A at T = +25C.) (Notes 1, 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range Voltage on either one of IN1IN4 or V to CC 2.7 5.8 V (Note 3) guarantee the part is fully operational Supply Current I V = 5.8V, IN2IN6 = GND, no load 0.9 1.2 mA CC IN1 IN1IN6, IN falling, T = +25C to +85C -1 +1 Threshold Accuracy A V % V TH TH (See the Selector Guide) IN1IN6, IN falling, T = -40C to +85C -1.5 +1.5 A Threshold Hysteresis V 0.3 % V TH-HYST TH Threshold Tempco V /C 10 ppm/C TH For V < highest V and IN IN1IN4 IN Input Impedance R V < V (not ADJ), thresholds are not set 130 200 300 k IN IN CC as adjustable IN5, IN6 (MAX6887 only) IN Input Leakage Current I -150 +150 nA IN IN1IN4 set as adjustable thresholds Power-Up Delay t V 2.5V 2.5 ms D-PO CC IN to RESET or OV Delay t IN falling/rising, 100mV overdrive 20 s D-R RESET Timeout Period t 180 200 220 ms RP OV Timeout Period t 25 s OP RESET, OV, and WDO Output V I = 4mA, output asserted 0.4 V OL SINK Low RESET, OV, and WDO Output I Output high impedance -1 +1 A LKG Open-Drain Leakage Current 2 MAX6887/MAX6888