MAX6892/MAX6893/MAX6894 19-3596 Rev 2 9/10 Pin-Selectable, Octal/Hex/Quad, Power-Supply Sequencers/Supervisors General Description Features Pin-Selectable or User-Adjustable Voltage The MAX6892/MAX6893/MAX6894 pin-selectable, mul- Detector Thresholds tivoltage supply sequencers/supervisors monitor sever- al voltage-detector inputs and one watchdog input, Dedicated RESET and WDO Outputs asserting the respective voltage detector or watchdog Capacitor-Adjustable Reset and Watchdog output when the inputs drop below the configured volt- Timeout Periods age thresholds or the watchdog timer expires. The Factory-Default Reset and Watchdog Timeout MAX6892 features eight voltage detector inputs and 10 Periods outputs. The MAX6893 features six voltage-detector Up to Eight Independent, Open-Drain Power-Good inputs and eight outputs, while the MAX6894 features Outputs four voltage detector inputs and six outputs. A RESET output ensures all monitored inputs are above the set Enable Margining Disable and Manual Reset thresholds. The voltage detector outputs are configured Controls as open drain. Manual reset and margin disable inputs -40C to +85C Operating Temperature Range offer additional flexibility. Small 5mm x 5mm Thin QFN Package The thresholds of the MAX6892/MAX6893/MAX6894 are Few External Components selected through five logic inputs (TH0TH4). The logic on 1% Threshold Accuracy these five inputs selects the supply voltage tolerance (5% or 10%) and one of 32 factory-set thresholds settings. Ordering Information Watchdog and reset timeout periods can use factory default settings or are independently adjustable by con- PART TEMP RANGE PIN-PACKAGE necting external capacitors. MAX6892ETJ -40C to +85C 32 Thin QFN-EP* When any of the monitored voltages falls below its MAX6893ETI -40C to +85C 28 Thin QFN-EP* threshold, the respective output asserts and remains MAX6894ETI -40C to +85C 28 Thin QFN-EP* asserted for 6.25ms (typ) after the monitored voltage Note: Devices are also available in a lead(Pb)-free/RoHS-compli- exceeds the threshold. The outputs can be connected ant package. Specify lead-free by adding a plus (+) to the part to the shutdown or enable inputs of DC-DC regulators number when ordering. to provide turn-on power sequencing to ensure proper *EP = Exposed pad. system initialization. Pin Configurations The MAX6892 is available in a 5mm x 5mm x 0.8mm, 32-pin, Thin QFN package, while the MAX6893/ TOP VIEW MAX6894 are available in a 5mm x 5mm x 0.8mm, 28- pin, Thin QFN package. The MAX6892/MAX6893/ 32 31 30 29 28 27 26 25 + MAX6894 are specified to operate over the extended IN7 PG2 1 24 temperature range (-40C to +85C). PG3 2 23 IN8 Applications PG4 3 22 DBP Telecommunication/Central Office Systems GND 4 21 V CC Networking Systems MAX6892 PG5 5 20 ENABLE Servers/Workstations PG6 6 19 SRT Base Stations PG7 7 18 SWT *EP Storage Equipment PG8 8 17 TH4 Multimicroprocessor/Voltage Systems 9 101112131415 16 Typical Operating Circuit appears at end of data sheet. THIN QFN *EXPOSED PAD INTERNALLY CONNECTED TO GND. Pin Configurations 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. RESET PG1 WDO WDI MARGIN IN1 MR IN2 TH0 IN3 TH1 IN4 TH2 IN5 TH3 IN6Pin-Selectable, Octal/Hex/Quad, Power-Supply Sequencers/Supervisors ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) 32-Pin Thin QFN (derate 21.3mW/C PG , RESET, WDO .................................................-0.3V to +14V above +70C)............................................................1702mW IN1IN8, TH0TH4, ENABLE, WDI, MR, MARGIN, Maximum Junction Temperature .....................................+150C SRT, SWT, V .....................................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C CC DBP ..........................................................................-0.3V to +3V Storage Temperature Range .............................-65C to +150C Input/Output Current (all pins)..........................................20mA Lead Temperature (soldering, 10s) .................................+300C Continuous Power Dissipation (T = +70C) Soldering Temperature (reflow) A 28-Pin Thin QFN (derate 21.3mW/C Lead(Pb)-Free..............................................................+260C above +70C).............................................................1702mW Containing Lead (Pb)...................................................+240C 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 V = V , V V = 2.7V to 5.5V, WDI = ENABLE = GND, TH0TH4 = MARGIN = MR = DBP, T = -40C to IN1 IN6 IN8 GND IN2 IN5 A +85C, unless otherwise noted. Typical values are at T = +25C.) (Notes 1, 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range Voltage on either one of IN2IN5 or V that CC 2.7 5.5 V (Note 3) guarantees the part is fully operational For 1V < (V V or V ) < V , IN2 IN5 CC UVLO Undervoltage Lockout V PG are pulled down to GND with a 10A 2.5 V UVLO current Digital Bypass Voltage V No load 2.48 2.55 2.67 V DBP V = 5.5V, V , V V = V , no IN2 IN1 IN3 IN8 GND Supply Current I 0.9 1.1 mA CC load T = +25C to +85C -1 +1 A IN1IN8, Threshold Accuracy (Table 2) V % V TH TH IN falling T = -40C to +85C -2 +2 A Threshold Hysteresis V 0.3 % V TH-HYS TH Threshold Tempco V /C 10 ppm/C TH IN1, IN6IN8 Input Leakage Current I -50 +50 nA IN IN2IN5 set as adjustable thresholds For IN voltages < the highest IN supply or < V and thresholds are not set as IN2IN5 Input Impedance R CC 290 400 555 k IN2IN5 adjustable Power-Up Delay t V V 3ms D-PO CC UVLO IN to PG Delay t IN falling/rising, 100mV overdrive 25 s D-R PG Timeout Period t 5.625 6.25 6.875 ms PG RESET Default Timeout Period t V = V 180 200 220 ms RP SRT CC RESET Adjustable Timeout Period t C = 47nF 135 207 280 ms RP-ADJ SRT SRT Adjustable Timeout Current I V = V 180 230 280 nA SRT SRT GND 2 MAX6892/MAX6893/MAX6894