general description the max6339 is a precision quad voltage monitor with microprocessor (?) supervisory reset timing. the device can monitor up to four system supply voltages without any external components and asserts a single reset if any supply voltage drops below its preset threshold. the device significantly reduces system size and component count while improving reliability compared to separate ics or discrete components. a variety of factory-trimmed threshold voltages are avail- able to accommodate different supply voltages and toler- ances with minimal external component requirements. the selection includes internally fixed options for monitor- ing +5.0v, +3.3v, +3.0v, +2.5v, +1.8v, and -5.0v sup- plies with -5% and/or -10% tolerances. the device is also available with one or two user-adjustable threshold options if non-standard thresholds are desired (use exter- nal resistor-divider network). the quad monitor provides a single active-low reset out- put that is asserted when any monitored input is below its associated threshold. the output is open drain with a weak internal pull-up (10?) to in2. reset remains low for a reset timeout period (140ms min) after all voltages are above the selected thresholds. the output is valid as long as either the in1 or in2 input voltage remains >1v. the max6339 is available in a small 6-pin sot23 pack- age and operates over the extended (-40? to +85?) temperature range. ________________________applications telecommunications high-end printers desktop and network computers data storage equipment networking equipment industrial equipment set-top boxes features monitors four power-supply voltages precision factory-set reset threshold options for +5.0v, +3.3v, +3.0, +2.5v, +1.8v, and -5.0v supplies user-adjustable voltage monitoring threshold options low 55? supply current open-drain reset output with 10? internal pull-up 140ms (min) reset timeout period reset valid to in1 = 1v or in2 = 1v immune to short monitored supply transients no external components required guaranteed from -40? to +85? small 6-pin sot23 package max6339 quad voltage p supervisory circuit in sot package ________________________________________________________________ maxim integrated products 1 19-1756; rev 1; 7/01 ordering information *insert the desired letter from the selector guide into the blank to complete the part number. there is a 2500 piece minimum order increment requirement on the sot package and these devices are available in tape-and-reel only. pin configuration appears at end of data sheet. part temp. range pin-package max6339_ut-t* -40 c to +85 c 6 sot23-6 max6339 in1 in2 in3 in4 reset gnd supplies to be monitored p typical operating circuit for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com.
max6339 quad voltage p supervisory circuit in sot package 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. terminal voltage (with respect to gnd) input voltages (in_ ) (except -5v)............................-0.3v to +6v reset .......................................................................-0.3v to +6v input voltage (-5v input) ..........................................-6v to +0.3v continuous reset current .................................................20ma continuous power dissipation (t a = +70 c) 6-pin sot23 (derate 8.7mw/ c above +70 c).........695.7mw operating temperature range ...........................-40 c to +85 c storage temperature range .............................-65 c to +150 c junction temperature ......................................................+150 c lead temperature (soldering, 10s) .................................+300 c parameter symbol conditions min typ max units supply voltage range (notes 2, 3) v in2 1.0 5.5 v v in_ = input threshold voltage (input threshold voltage of 1.8v, 2.5v, 5v) 25 40 v in2 = input threshold voltage (input threshold voltage of 3.0v, 3.3v) (note 4) 55 115 v in_ = 0 to v in2 (input threshold voltage = 1.23v) -0.1 0.1 input current i in _ v in_ = -5v (input threshold voltage = -5v) -15 -20 a +5v (-5%) threshold 4.50 4.63 4.75 +5v (-10%) threshold 4.25 4.38 4.50 +3.3v (-5%) threshold 3.00 3.08 3.15 +3.3v (-10%) threshold 2.85 2.93 3.00 +3.0v (-5%) threshold 2.70 2.78 2.85 +3.0v (-10%) threshold 2.55 2.63 2.70 +2.5v (-10% ) threshold 2.13 2.19 2.25 v in_ decreasing +1.8v (-10%) threshold 1.53 1.58 1.62 -5v (+5%) threshold -4.75 -4.63 -4.50 reset threshold voltage v th v in_ increasing -5v (+10%) threshold -4.50 -4.38 -4.25 v adjustable threshold v th v in decreasing 1.20 1.23 1.26 v threshold voltage temperature coefficient 60 ppm/ c threshold hysteresis v hyst 0.3 % reset delay t rd v in = v th to (v th - 50mv) (all inputs except 5v) or v in_ = v th to (v th + 50mv) (-5v input only) 20 s reset active timeout period t rp 140 200 280 ms electrical characteristics (v in2 = +1v to +5.5v, t a = -40 c to +85 c, unless otherwise noted. typical values are at v in2 = +3.0v to +3.3v, t a = +25 c, unless otherwise noted.) (note 1)
max6339 quad voltage p supervisory circuit in sot package _______________________________________________________________________________________ 3 electrical characteristics (continued) (v in2 = +1v to +5.5v, t a = -40 c to +85 c, unless otherwise noted. typical values are at v in2 = +3.0v to +3.3v, t a = +25 c, unless otherwise noted.) (note 1) note 1: 100% production tested at t a = +25 c. limits over temperature guaranteed by design. note 2: the device is powered from input in2. note 3: the reset output is guaranteed to be in the correct state for in1 or in2 down to 1v. note 4: monitored voltage (+3.3v, +3.0v) is also the device power supply. supply current splits as follows: 25a for the resistor- divider (for the monitored voltage) and 30a for other circuits. parameter symbol conditions min typ max units v in2 = 5v, i sink = 2ma 0.4 v in2 = 2.5v, i sink = 1.2ma 0.4 output low voltage v ol v in1 = v in2 = 1v, i sink = 50 a0.4 v output high voltage output high source current v oh v in2 > 2.55v, i source = 6 a ( reset unasserted) 0.8 v in2 v output high source current i oh v in2 > 2.55v ( reset unasserted) 6 10 a 35 50 45 40 55 60 65 70 75 80 85 -40 0 -20 20406080 i in2 input current vs. temperature max6339toc01 temperature ( c) i in2 input current ( a) v in2 = +3.3v v in2 = +3.0v 50 60 55 70 65 80 75 85 3.0 4.0 3.5 4.5 5.0 5.5 i in2 input current vs. i in2 voltage max6339toc02 input voltage (v) i in2 input current ( a) -0.30 -0.15 -0.20 -0.25 -0.10 -0.5 0 0.05 0.10 0.15 -40 0 -20 20406080 normalized threshold error vs. temperature max6339toc03 temperature ( c) normalized threshold error (%) v th = +5v v th = 1.8v v in2 = +3.0v typical operating characteristics (v in2 = +3.0v, t a = +25 c)
pin description pin name function 1 in1 input voltage 1. see selector guide for monitored voltages. 2in2 input voltage 2. see selector guide for monitored voltages. in2 is the power-supply input for the device. 3 in3 input voltage 3. see selector guide for monitored voltages. 4 in4 input voltage 4. see selector guide for monitored voltages. 5 gnd ground 6 reset reset output, active low. reset goes low when any input goes below its specified threshold. after all inputs are above their threshold voltage, reset remains low for at least 140ms (minimum) before going high. reset output is open drain with a weak internal pullup to in2. max6339 quad voltage p supervisory circuit in sot package 4 _______________________________________________________________________________________ typical operating characteristics (continued) (v in2 = +3.0v, t a = +25 c) 180 190 185 195 200 205 210 215 -40 0 -20 20406080 reset timeout delay vs. temperature max6339toc07 temperature ( c) reset timeout delay (ms) reset 2v/div in_ 2v/div 200ms/div reset timeout delay max6339toc08 2v/div 0 20 10 30 60 70 50 40 80 0 200 300 400 500 100 600 700 800 900 1000 maximum in_ transient duration vs. reset threshold overdrive max6339toc04 reset threshold overdrive (mv) maximum in_ transient duration ( s) reset asserted above this line 0 20 10 30 60 70 50 40 80 0 200 300 400 500 100 600 700 800 900 1000 reset delay vs. reset threshold overdrive (in_ decreasing) max6339toc05 reset threshold overdrive (mv) reset delay ( s) reset 2v/div in_ 100mv/div 10 s/div reset pull-up and pull-down response (c l = 47pf) max6339toc06
max6339 quad voltage p supervisory circuit in sot package _______________________________________________________________________________________ 5 detailed description the max6339 is a very small, low-power, quad voltage p supervisory circuit designed to maintain system integrity in multi-supply systems (figure 1). the device offers several internally trimmed undervoltage threshold options that minimize or eliminate the need for external components. preset voltage monitoring options for +5.0v, +3.3v, +3.0v, +2.5v, +1.8v, and -5.0v make it ideal for telecommunications, desktop and notebook computers, high-end printers, data storage equipment, and networking equipment applications. the quad monitor/reset includes an accurate bandgap reference, four precision comparators, and a series of internal trimmed resistor-divider networks to set the fac- tory-fixed reset threshold options. the resistor networks scale the specified in_ reset voltages to match the internal bandgap reference/comparator voltage. user- adjustable threshold options bypass the internal resis- tor networks and connect directly to one of the comparator inputs (an external resistor-divider network is required for threshold matching). all threshold volt- age options, fixed and adjustable, are indicated through a single-letter code in the product number (see selector guide ). each of the internal comparators has a typical hystere- sis of 0.3% with respect to its reset threshold. this built- in hysteresis improves the monitor s immunity to ambient noise without significantly reducing threshold accuracy when an input sits at its specified reset volt- age. the max6339 is also designed to ignore short in_ transients. see typical operating characteristics for a glitch immunity graph. applications information reset output the max6339 reset output is asserted low when any of the monitored in_ voltages drop below its specified reset threshold (or above for -5v option) and remain low for the reset timeout period (140ms minimum) after all inputs exceed their thresholds (figure 2). the output is open drain with a weak internal pullup to the moni- tored in2 supply (10a typ). for many applications no external pullup resistor is required to interface with other logic devices. an external pullup resistor to any voltage from 0 to +5.5v can overdrive the internal pullup if interfacing to different logic supply voltages (figure 3). internal circuitry prevents reverse current flow from the external pullup voltage to in2. the max6339 is normally powered from the monitored in2 supply when all input voltages are above their specified thresholds. when any supply drops below its threshold, the reset output is asserted and guaranteed to remain low while either in1 or in2 is above +1.0v. user-adjustable thresholds the max6339 offers several monitor options with user- adjustable reset thresholds. the threshold voltage at each adjustable in_ input is typically 1.23v. to monitor a voltage >1.23v, connect a resistor-divider network to the circuit as shown in figure 4. v inth = 1.23v x (r1 + r2) / r2 or, solved in terms of r1: r1 = r2 ((vi nth / 1.23v) - 1) because the max6339 has a guaranteed input current of 0.1a on its adjustable inputs, resistor values up to 100k ? can be used for r2 with <1% error. unused inputs if some monitor inputs are to be unused, they must be tied to a supply voltage greater in magnitude than their specified threshold voltages. for unused in3 or in4 options with positive thresholds (fixed or adjustable), the inputs can be connected directly to the in2 supply. for unused in4 options with negative thresholds, the input must be tied to a more negative supply. the in2 input must always be used for normal operation (device power-supply pin). unused pins cannot be connected to ground or allowed to float. negative voltage monitoring beyond -5v the max6339 is offered with options to monitor -5v supplies with internally fixed thresholds. to monitor supplies more negative than -5v, a low-impedance resistor-divider network can be used external to the max6339 as shown in figure 5. the current through the external resistor-divider should be greater than the input current for the -5v monitor options. for an input monitor current error of <1%, the resistor-divider cur- rent should 2ma (for i in4 = 20a max). set r2 = 2.5k ? . calculate r1 based on the desired v in_ reset threshold voltage, using the following formula: r1 = r2 ? [(v inth / v th ) -1] where r2 2.49k ? , v inth = desired threshold voltage and v th is the internal threshold voltage.
max6339 quad voltage p supervisory circuit in sot package 6 _______________________________________________________________________________________ in1 (5v) in2 (3.3/3v) in3 (aux) in4 (-5v) in2 in1 reference nor gate in1(5v) pullup time out (200ms) v ref reset max6339 all devices are powered from in2 (3.0v/3.3v). reset is valid if v in1 or v in2 is greater than 1v. figure 1. max6339 functional diagram
max6339 quad voltage p supervisory circuit in sot package _______________________________________________________________________________________ 7 for -v in = -12v nominal, vi nth = -11.1v, v th = -4.63v, and r2 = 2.49k ? , r1 = 2.49k ? ? [(-11.1 / -4.63) -1] r1 = 3.48k ? power-supply bypassing and grounding the max6339 is normally powered from the monitored in2 supply input. all monitor inputs are immune to short supply transients. if higher immunity is desired in noisy applications, connect 0.1f bypass capacitors from the in2 input to ground. additionally, capacitance can be added to in1, in3, and in4 to increase their noise immunity. chip information transistor count: 896 process technology: bicmos figure 2. reset output timing diagram figure 4. setting the auxiliary monitor v th_ 90% 10% in_ v th_ reset t rp t rd r1 = r2 ( - 1 ) v inth 1.23 v ref = 1.23v r2 r1 v inth figure 3. interfacing to different logic supply voltage in2 gnd in2 = +3.3v +5v max6339 v cc gnd reset reset 100k ? in2 in4 in3 16 reset 5 gnd in1 max6339 sot23 top view 2 34 pin configuration figure 5. negative voltage monitoring beyond -5v r1 = r2 [( ) -1 ] v inth v th v ref = 1.23v r1 r2 -5v v inth
nominal input voltage part in1 (v) in2 (v) in3 (v) in4 (v) supply tolerance (%) top mark max6339aut 5 3.3 2.5 adj* 10 aaju max6339but 5 3.3 2.5 ? adj* 5 aajv max6339cut 5 3.3 1.8 adj* 10 aajw max6339dut 5 3.3 1.8 ? adj* 5 aajx MAX6339EUT 5 3.0 2.5 adj* 10 aajy max6339fut 5 3.0 2.5 ? adj* 5 aajz max6339gut 5 3.0 1.8 adj* 10 aaka max6339hut 5 3.0 1.8 ? adj* 5 aakb max6339iut 5 3.3 2.5 1.8 10 aakc max6339jut 5 3.3 2.5 ? 1.8 ? 5 aakd max6339kut adj* 3.3 2.5 adj* 10 aake max6339lut adj* 3.3 2.5 adj* 5 aakf max6339mut 5 3.0 adj* -5 10 aakg max6339nut 5 3.0 adj* -5 5 aakh max6339out 5 3.3 adj* -5 10 aaki max6339put 5 3.3 adj* -5 5 aakj selector guide * adjustable voltage based on +1.23v internal threshold. external threshold voltage can be set using an external resistor-divider . ? normal input voltages for 1.8v and 2.5v are specified for 10% tolerances. max6339 quad voltage p supervisory circuit in sot package 8 _______________________________________________________________________________________
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600_____________________ 9 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. 6lsot.eps package information
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