general description the max6338 quad voltage monitor is capable of moni- toring up to four supplies without any external compo- nents. a variety of factory-trimmed threshold voltages and supply tolerances are available to optimize the max6338 for specific applications. the selection includes input options for monitoring +5.0v, +3.3v, +3.0v, +2.5v, +1.8v, and -5.0v voltages. an additional high-input impedance comparator option can be used as an adjustable voltage monitor, general-purpose com- parator, or digital level translator. each of the monitored voltages is available with trip thresholds to support power-supply tolerances of either 5% or 10% below the nominal voltage. an internal bandgap reference ensures accurate trip thresholds across the extended (-40? to +85?) operating temper- ature range. the max6338 consumes 25? (typ) supply current and operates with supply voltages from +2.5v to +5.5v. an internal undervoltage lockout circuit forces all four digital outputs low when v cc drops below the minimum operat- ing voltage. the four digital outputs all have weak inter- nal pull-ups to v cc , allowing wire-ored connection. each input threshold voltage has an independent output. the max6338 is available in a 10-pin ?ax package. ________________________applications telecommunicationshigh-end printers desktop and notebook computers data storage equipment networking equipment industrial equipment set-top boxes features ? monitors four voltages (factory programmed oruser adjustable) +5.0v, +3.3v, +3.0v, +2.5v, +1.8v, -5.0v (nominal) or user-adjustable settings ? low 25? supply current ? four independent, open-drain, active-lowoutputs ? +2.5v to +5.5v supply voltage range ? guaranteed from -40? to +85? ? no external components required ? small 10-pin ?ax package max6338 quad voltage monitor in max package ________________________________________________________________ maxim integrated products 1 1 23 4 5 10 98 7 6 v cc out1out2 out3 in4 in3 in2 in1 max6338 max top view out4 gnd pin configuration nominal input voltage part in1 (v) in2 (v) in3 (v) in4 (v) supply tolerance (%) max6338aub 5 3.3 2.5 adj* 10 max6338bub 5 3.3 2.5? adj* 5 max6338cub 5 3.3 1.8 adj* 10 max6338dub 5 3.3 1.8? adj* 5 max6338eub 5 3.0 2.5 adj* 10 max6338fub 5 3.0 2.5? adj* 5 max6338gub 5 3.0 1.8 adj* 10 max6338hub 5 3.0 1.8? adj* 5 max6338iub 5 3.3 2.5 1.8 10 max6338jub 5 3.3 2.5? 1.8? 5 max6338kub adj* 3.3 2.5 adj* 10 max6338lub adj* 3.3 2.5? adj* 5 max6338mub 5 3.0 adj* -5 10 max6338nub 5 3.0 adj* -5 5 max6338oub 5 3.3 adj* -5 10 max6338pub 5 3.3 adj* -5 5 19-1695; rev 2; 12/05 ordering information selector guide part temp range pin-package max6338_ub* -40 c to +85 c 10 ?ax * insert the desired letter from the selector guide into the blank to complete the part number.devices are available in both leaded and lead-free packaging. specify lead free by adding the + symbol at the end of the part number when ordering. * adjustable voltage based on +1.23v internal threshold. external threshold voltage can be set using an external resistor-divider. ? nominal input voltages for 1.8v and 2.5v are specified for 10% tolerances 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. ?ax is a registered trademark of maxim integrated products, inc. downloaded from: http:///
max6338 quad voltage monitor in max package 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(v cc = +2.5v to +5.5v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25? and v cc = +5v, unless other- wise noted.) (note 1) stresses beyond those listed under ?bsolute 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. terminal voltage (with respect to gnd) v cc ......................................................................-0.3v to +6v output voltages (out_) ...........................................-0.3v to +6v input voltages (in_) (except -5v).............................-0.3v to +6v input voltage (-5v input) ..........................................-6v to +0.3v continuous out_ current...................................................20ma continuous power dissipation (t a = +70?) 10-pin ?ax (derate 5.6mw/? above +70?) ..........444mw operating temperature range ...........................-40? to +85? storage temperature range .............................-65? to +150? junction temperature ......................................................+150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units supply voltage range v cc +2.5 +5.5 v v cc = +3v 25 50 supply current i cc v cc = +5v 35 65 ? v in_ = input threshold voltage (+1.8v, +2.5v, +3.0v, +3.3v, +5.0v) 25 40 v in_ = 0 to v cc (input threshold voltage =1.23v) -0.1 +0.1 input current (note 2) i in_ v in_ = -5v (input threshold voltage = -5v) -10 -20 ? +5.0v (-5%) threshold v th v in decreasing 4.5 4.63 4.75 v +5.0v (-10%) threshold v th v in decreasing 4.25 4.38 4.50 v +3.3v (-5%) threshold v th v in decreasing 3.0 3.08 3.15 v +3.3v (-10%) threshold v th v in decreasing 2.85 2.93 3.00 v +3.0v (-5%) threshold v th v in decreasing 2.7 2.78 2.85 v +3.0v (-10%) threshold v th v in decreasing 2.55 2.63 2.70 v +2.5v (-10%) threshold v th v in decreasing 2.13 2.19 2.25 v +1.8v (-10%) threshold v th v in decreasing 1.53 1.58 1.62 v -5.0v (+5%) threshold v th v in increasing -4.75 -4.63 -4.50 v -5.0v (+10%) threshold v th v in increasing -4.5 -4.38 -4.25 v adjustable threshold v th v in decreasing 1.20 1.23 1.26 v threshold voltage temperaturecoefficient 60 ppm/ c threshold hysteresis v thyst 0.3 % propagation delay t pd v in_ = v th to (v th - 50mv) or v th to (v th - 50mv) 20 ? v cc = 5v, i sink = 2ma 0.4 v cc = 2.5v, i sink = 1.2ma 0.4 output low voltage v ol v cc = 1v, i sink = 50? 0.4 v output high voltage v oh v cc > 2.5v, i source = 6? (minimum) 0.8 x v cc v note 1: 100% production tested at +25 c. overtemperature limits guaranteed by design. note 2: guaranteed by design. downloaded from: http:///
max6338 quad voltage monitor in max package _______________________________________________________________________________________ 3 10 2015 3025 4035 45 2.5 3.5 4.0 3.0 4.5 5.0 5.5 supply current vs. supply voltage max6338-01 supply voltage (v) supply current ( a) t a = +85 c t a = +25 c t a = -40 c -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.10 2.5 3.5 3.0 4.0 4.5 5.0 5.5 normalized threshold error vs. supply voltage max6338-02 supply voltage (v) normalized threshold error (%) normalized to +5v -0.3 -0.2 -0.1 0 0.1 -40 20 40 -20 0 60 80 normalize threshold vs. temperature max6338-03 temperature ( c) normalized threshold (%) v cc = +5v 0 0.30.2 0.1 0.4 0.5 0.6 04 3 12 5678910 output-voltage low vs. sink current max6338-04 sink current (ma) output-voltage low (v) t a = +25 c v cc = 5v t a = -40 c t a = +85 c propagation delay (with 100mv overdrive) max6338-05 10s/div in_ 50mv/div out_ 2v/div propagation delay (with 20mv overdrive) max6338-06 10 s/div in_ 20mv/div out_ 2v/div t ypical operating characteristics (v cc = +5v, t a = +25 c, unless otherwise noted.) downloaded from: http:///
_______________detailed description the max6338 is a low-power (25?), quad voltage monitor designed for multivoltage systems. preset volt- age options for +5.0v, +3.3v, +3.0v, +2.5v, +1.8v, and -5.0v make these quad monitors ideal for applications such as telecommunications, desktop and notebook computers, high-end printers, data storage equipment, and networking equipment. the max6338 has an internally trimmed threshold that minimizes or eliminates the need for external compo- nents. the four open-drain outputs have weak (10?) internal pullups to v cc , allowing them to interface easily with other logic devices. the max6338 can monitorpower supplies with either 5% or 10% tolerance specifi- cations, depending on the selected version. an addi- tional high-input-impedance comparator option can be used as an adjustable voltage monitor, general-pur- pose comparator, or digital level translator. the weak internal pullups can be overdriven by external pullups to any voltage from 0 to +5.5v. internal circuitry prevents current flow from the external pullup voltage to v cc . the outputs can be wire-ored for a single ?ower good?signal.the max6338 has either one or two auxiliary inputs and two or three factory-programmed threshold voltages, or four fixed voltages. the inverting input of all compara- tors is connected to a 1.23v bandgap reference for allpositive voltages. the noninverting terminals are acces- sible through internal resistive voltage-dividers with preset factory threshold voltages. in the case of auxil- iary (aux) input, the positive terminal of the comparator is accessible directly for setting the threshold for the monitored voltage. when any of the inputs (in1?n4) are higher than the threshold level, the output is high. the output goes low as the input drops below the threshold voltage monitor. the undervoltage lockout circuitry remains active and the outputs remain low with v cc down to 1v (figure 1). applications information hysteresis when the voltage on one comparator input is at or nearthe voltage on the other input, ambient noise generally causes the comparator output to oscillate. the most common way to eliminate this problem is through hys- teresis. when the two comparator input voltages are equal, hysteresis causes one comparator input voltage to move quickly past the other, thus taking the input out of the region where oscillation occurs. standard com- parators require hysteresis to be added through the use of external resistors. the external resistive network usually provides a positive feedback to the input in order to cause a jump in the threshold voltage when max6338 quad voltage monitor in max package 4 _______________________________________________________________________________________ pin description pin name function 1 in1 input voltage 1. see the selector guide for monitored voltages. 2 in2 input voltage 2. see the selector guide for monitored voltages. 3 in3 input voltage 3. see the selector guide for monitored voltages. 4 in4 input voltage 4. see the selector guide for monitored voltages. 5 gnd ground 6 out4 output 4. out4 goes low when v in4 falls below its absolute threshold. out4 is open drain with a 10? internal pullup to v cc . 7 out3 output 3. out3 goes low when v in3 falls below its absolute threshold. out3 is open drain with a 10? internal pullup to v cc . 8 out2 output 2. out2 goes low when v in2 falls below its absolute threshold. out2 is open drain with a 10? internal pullup to v cc . 9 out1 output 1. out1 goes low when v in1 falls below its absolute threshold. out1 is open drain with a 10? internal pullup to v cc . 10 v cc power supply. connect v cc to a +2.5v to +5.5v supply. an undervoltage lockout circuit forces all out_ pins low when v cc drops below 2.5v. downloaded from: http:///
max6338 quad voltage monitor in max package _______________________________________________________________________________________ 5 in1 in2 in3* (aux)* in4 (-5v) v cc v cc v cc v cc out1out2 out3 out4 reference undervoltage lockout v ref v cc *see auxiliary input section. max6338m/n/o/p figure 1. functional diagram downloaded from: http:///
max6338 output toggles in one direction or the other. theseresistors are not required when using the max6338 because hysteresis is built into the device. max6338 hysteresis is typically 0.3%. undervoltage detection circuit the open-drain outputs of the max6338 can be config-ured to detect an undervoltage condition. figure 2 shows a configuration where a low at a comparator out- put indicates an undervoltage condition, which in turn causes an led to light. the max6338 can also be used in applications such assystem supervisory monitoring, multivoltage level detection, and v cc bar graph monitoring (figure 3). window detection a window detector circuit uses two auxiliary inputs in aconfiguration such as the one shown in figure 4. external resistors r1?4 set the two threshold voltages (v th1 and v th4 ) of the window detector circuit. window width ( ? v th ) is the difference between the threshold voltages (figure 5). quad voltage monitor in max package 6 _______________________________________________________________________________________ in1 v cc gnd in2in3 in4 out1 0.1 f* out2out3 out4 +5v *optional max6338 v1v2 v3 v4 d3 d1 d2 d4 in1 v cc gnd in2in3 in4 out1out2 out3 out4 v in (+5v) +5v max6338 in1 v cc gnd in2in3 in4 out1out2 out3 out4 +5v max6338hub out1 input r2r4 r1 r3 v th1 = ( 1 + ) v ref r2r1 v th4 = ( 1 + ) v ref r4r3 v ref = 1.23v out1 out4 out v th1 v th4 ? v th figure 2. quad undervoltage detector with led indicators figure 3. v cc bar graph monitoring figure 4. window detection figure 5. output response of window detector circuit downloaded from: http:///
auxiliary input the adjustable voltage monitor is comparable to aninternal reference of 1.23v as shown in figure 6. to set the desired trip level of monitored supply, v inth , choose: r1 = r2 [(v inth / 1.23) - 1)]. for example, for a voltage detection at 4.5v (assume r2 = 100k ? ), r1 = 265k ? . unused inputs the unused inputs (except the auxiliary) are internallyconnected to ground through the lower resistors of the threshold-setting resistor pairs. the auxiliary (aux) input, however, must be connected to either ground or v cc if unused. power-supply bypassing and grounding the max6338 operates from a single +2.5v to +5.5vsupply. in noisy applications, connect a 0.1? capaci- tor on the supply voltage line close to v cc pin for bypassing. chip information transistor count: 620process: bicmos max6338 quad voltage monitor in max package _______________________________________________________________________________________ 7 figure 6. setting the auxiliary monitor t ypical operating circuit r1 = r2 ( - 1 ) v inth 1.23 v ref = 1.23v r2 r1 v inth max6338 in1in2 in3 in4 out1 v cc out2out3 out4 gnd system logic +2.5v to +5.5v (may be one of the monitored voltages) supplies to be monitored p downloaded from: http:///
max6338 quad voltage monitor in max package maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. 10lumax.eps package outline, 10l umax/usop 1 1 21-0061 rev. document control no. approval proprietary information title: top view front view 1 0.498 ref 0.0196 ref s 6 side view bottom view 0 0 6 0.037 ref 0.0078 max 0.006 0.043 0.118 0.120 0.199 0.0275 0.118 0.0106 0.120 0.0197 bsc inches 1 10 l1 0.0035 0.007 e c b 0.187 0.0157 0.114 h l e2 dim 0.116 0.114 0.116 0.002 d2 e1 a1 d1 min - a 0.940 ref 0.500 bsc 0.090 0.177 4.75 2.89 0.40 0.200 0.270 5.05 0.70 3.00 millimeters 0.05 2.89 2.95 2.95 - min 3.00 3.05 0.15 3.05 max 1.10 10 0.60.1 0.60.1 0.500.1 h 4x s e d2 d1 b a2 a e2 e1 l l1 c gage plane a2 0.030 0.037 0.75 0.95 a1 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) downloaded from: http:///
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