general description the max6335/max6336/max6337 microprocessor ( p) supervisory circuits monitor the power supplies in 1.8v to 3.3v ? and digital systems. they increase circuit reli- ability and reduce cost by eliminating external compo- nents and adjustments. they also feature a debounced manual-reset input. these devices perform a single function: they assert a reset signal whenever the v cc supply voltage declines below a preset threshold or whenever manual reset is asserted. reset remains asserted for a preset timeout period after v cc has risen above the reset threshold or after manual reset is deasserted. the only difference among the three devices is their output. the max6336 (push/pull) and max6337 (open-drain) have an active- low reset output, while the max6335 (push/pull) has an active-high reset output. the max6335/max6336 are guaranteed to be in the correct state for v cc down to 0.7v. the max6337 is guaranteed to be in the cor- rect state for v cc down to 1.0v. the reset comparator in these ics is designed to ignore fast transients on v cc . reset thresholds are factory- trimmable between 1.6v and 2.5v, in approximately 100mv increments. there are 15 standard versions available (2500 piece minimum-order quantity); contact the factory for availability of nonstandard versions (10,000 piece minimum-order quantity). for space-criti- cal applications, the max6335/max6336/max6337 come packaged in a 4-pin sot143. applications pentium ii computers computers controllers intelligent instruments critical ?/? power monitoring portable/battery-powered equipment automotive features ? ultra-low 0.7v operating supply voltage ? low 3.3 a supply current ? precision monitoring of 1.8v and 2.5v power- supply voltages ? reset thresholds available from 1.6v to 2.5v, in approximately 100mv increments ? debounced manual reset ? fully specified over temperature ? three power-on reset pulse widths available (1ms min, 20ms min, 100ms min) ? low cost ? three available output structures: push/pull reset , push/pull reset, open-drain reset ? guaranteed reset/ reset valid to v cc = 0.7v (max6335/max6336) ? power-supply transient immunity ? no external components ? 4-pin sot143 package ? pin compatible with max811/max812 and max6314/max6315 max6335/max6336/max6337 4-pin, ultra-low-voltage, low-power p reset circuits with manual reset ________________________________________________________________ maxim integrated products 1 19-1412; rev 2; 12/05 part* max6335 us__d_-t max6336 us__d_-t max6337 us__d_-t -40? to +125? -40? to +125? -40? to +125? temp. range pin-package 4 sot143 4 sot143 4 sot143 ordering information * these devices are available in factory-set v cc reset thresh- olds from 1.6v to 2.5v, in approximately 0.1v increments. choose the desired reset threshold suffix from table 1 and insert it in the blanks following ?s?in the part number. factory-programmed reset timeout periods are also available. insert the number corresponding to the desired nominal reset timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in the blank following ??in the part number. there are 15 stan- dard versions with a required order increment of 2500 pieces. sample stock is generally held on the standard versions only (see selector guide). contact the factory for availability of non- standard versions (required order increment is 10,000 pieces). all devices available in tape-and-reel only. devices are available in both leaded and lead-free packaging. specify lead-free by replacing ?t?with ?t?when ordering. typical operating circuit and pin configuration appear at end of data sheet. selector guide appears at end of data sheet. pentium ii is a trademark of intel corp. 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.
max6335/max6336/max6337 4-pin, ultra-low-voltage, low-power p reset circuits with manual reset 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics ( v cc = full range, mr = v cc or unconnected, t a = -40? to +125?, unless otherwise noted. typical values are at t a = +25? and v cc = 3v, reset not asserted.) 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) v cc ......................................................................-0.3v to +6v push/pull reset or reset , mr ............-0.3v to (v cc + 0.3v) open-drain reset ..............................................-0.3v to +6v input current (v cc ) .............................................................20ma output current (reset, reset ) .........................................20ma continuous power dissipation (t a = +70?) sot143 (derate 4mw/? above +70?) .....................320mw operating temperature range .........................-40? to +125? storage temperature range .............................-65? to +160? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units supply voltage range v cc t a = 0? to +85? max6335/max6336 0.7 5.5 v t a = +25? v th - v th v th + 1.8% 1.8% t a = -40? to +125? v th - v th v th + 3% 3% reset threshold v th max633_us_ _d_-t, table 1 v v cc falling reset delay v cc falling at 10v/ms 24 ? max633_us_ _d1-t 1 1.5 2 max633_us_ _d2-t 20 30 40 reset active timeout period t rp max633_us_ _d3-t 100 150 200 ms reset output low voltage (max6336/max6337) v ol i sink = 50?, v cc 1.0v 0.4 reset asserted v reset output high voltage (max6336) v oh i source = 200?, v cc 1.8v 0.8v cc i source = 500?, v cc 2.7v 0.8v cc v reset output voltage (max6335) v oh reset asserted i source = 1?, v cc 1.0v 0.8v cc i source = 200?, v cc 1.8v 0.8v cc v v ol reset not asserted i sink = 500?, v cc 1.8v i sink = 1.2ma, v cc 2.7v 0.3 v 0.3 reset not asserted 0.3v cc 0.7v cc mr minimum pulse width 1 v cc = 2.6v 160 ? v cc = 2.6v 0.42 ? v ns v mr mr threshold mr reset delay mr glitch immunity 12 20 30 k ? mr pull-up resistance i sink = 500?, v cc 1.8v 0.3 0.5 v cc > v th , reset deasserted ? reset output leakage current (max6337) supply current i cc no load v cc = 1.8v 3.0 6.0 v cc = 2.5v 3.3 7.0 ? t a = -40? to +125? max6335/max6336 1.2 5.5 t a = -40? to +85? max6335/max6336 0.78 5.5 max6337 max6337 max6337 1.0 5.5 1.2 5.5
4-pin, ultra-low-voltage, low-power p reset circuits with manual reset _______________________________________________________________________________________ 3 2.0 2.6 2.2 3.0 3.6 3.8 3.4 3.2 4.0 -60 2.4 -40 -20 0 2.8 20 40 60 80 100 supply current vs. temperature max6335/36/37 toc-1 temperature (?) i cc ( a) reset not asserted v cc = 2.5v v cc = 1.8v 0.950 0.990 0.970 1.000 1.030 1.040 1.020 1.010 1.050 -60 -40 0.980 -20 0 0.960 20 40 60 80 100 normalized reset timeout period vs. temperature max6335/36/37-2 temperature (?) normalized reset timeout period v th = 2.2v 0 20 10 30 60 70 50 40 80 0.50 1.00 1.50 2.00 2.50 3.00 output voltage low vs. supply voltage max6335/36/37 toc-3 v cc (v) output voltage low (mv) v th = 2.5v i sink = 500 a reset asserted t a = +25? t a = +85? t a = -40? 0 40 20 80 60 100 120 140 160 0.5 1.0 1.25 0.75 1.5 1.75 2.0 2.25 2.5 output voltage high vs. supply voltage max6335/36/37 toc-4 v cc (v) output voltage high (v cc - v oh ) (mv) v th = 2.2v i source = 100 a reset asserted t a = +25? t a = +85? t a = -40? 100 1000 0 100 200 400 300 500 600 0.1 1 10 maximum transient duration vs. reset comparator overdrive max6335/36/37 toc-5 reset comparator overdrive (mv) maximum transient duration ( s) reset occurs reset does not occur 10 20 -20 40 30 70 60 50 80 -60 0 -40 20 4 06080100 v cc falling propagation delay vs. temperature max6332/33/34 toc-6 temperature (?) propagation delay ( s) v cc falling at 10v/ms v cc falling at 1v/ms __________________________________________typical operating characteristics (reset not asserted, t a = +25?, unless otherwise noted.) max6335/max6336/max6337
max6335/max6336/max6337 4-pin, ultra-low-voltage, low-power p reset circuits with manual reset 4 _______________________________________________________________________________________ pin description gnd ground 1 reset active-low reset output. reset remains low while v cc is below the reset threshold, or mr is asserted and for a reset timeout period (t rp ) after v cc rises above the reset threshold, or mr is deasserted. reset on the max6337 is open-drain. 2 reset active-high reset output. reset remains high while v cc is below the reset threshold, or mr is asserted and for a reset timeout period (t rp ) after v cc rises above the reset threshold, or mr is deasserted. reset also asserts when mr is low. name function max6335 max6336 max6337 1 2 pin applications information manual-reset inputs many ?-based products require manual-reset capabil- ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. a logic low on mr asserts reset. reset remains asserted while mr is low, and for the reset active timeout period after mr returns high. mr has an internal 20k ? pull-up resistor, so it can be left unconnected if not used. connect a normally open momentary switch from mr to gnd to create a manual-reset function; external debounce circuitry is not required. interfacing to ps with bidirectional reset pins since the reset output on the max6337 is open-drain, this device interfaces easily with ?s that have bidirec- tional reset pins, such as the motorola 68hc11. connecting the ? supervisor? reset output directly to the microcontroller? (??) reset pin with a single pull-up resistor allows either device to assert reset (figure 1). negative-going v cc transients in addition to issuing a reset to the ? during power-up, power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going v cc transients (glitches). the typical operating characteristics show the maximum transient duration vs. reset comparator overdrive graph. the graph shows the maximum pulse width that a negative-going v cc transient may typically have without issuing a reset signal. as the amplitude of the transient increases, the maximum allowable pulse width decreases. ensuring a valid reset output down to v cc = 0 when v cc falls below 1v and approaches the minimum operating voltage of 0.7v, push/pull-structured reset sinking (or sourcing) capabilities decrease drastically. high-impedance cmos-logic inputs connected to the reset pin can drift to indeterminate voltages. this does not present a problem in most cases, since most ?s and circuitry do not operate at v cc below 1v. for the max6336, where reset must be valid down to 0, adding a pull-down resistor between reset and gnd removes stray leakage currents, holding reset low v cc v cc gnd max6337 reset mr v cc gnd reset input motorola 68hcxx p figure 1. interfacing to ?s with bidirectional reset pins 3 mr 3 manual-reset input. a logic low on mr asserts reset. reset remains asserted as long as mr is low, and for the reset timeout period (t rp ) after mr goes high. leave unconnected or connect to v cc if not used. 4 v cc 4 supply voltage (0.7v to 5.5v)
4-pin, ultra-low-voltage, low-power p reset circuits with manual reset _______________________________________________________________________________________ 5 max6335/max6336/max6337 v cc gnd max6336 reset mr 100k (a) v cc gnd max6335 reset 100k* (b) *assumes high-z reset input to the p mr * factory-trimmed reset thresholds are available in approximately 100mv increments, with a ?.8% room-temperature variance. t a = +25? t a = -40? to +125? min typ max min max max633_us25d_ 2.46 2.50 2.55 2.43 2.58 max633_us24d_ 2.36 2.40 2.44 2.33 2.47 max633_us23d_ 2.26 2.30 2.34 2.23 2.37 max633_us22d_ 2.16 2.20 2.24 2.13 2.27 max633_us21d_ 2.06 2.10 2.14 2.04 2.16 max633_us20d_ 1.96 2.00 2.04 1.94 2.06 max633_us19d_ 1.87 1.90 1.93 1.84 1.96 max633_us18d_ 1.77 1.80 1.83 1.75 1.85 max633_us17d_ 1.67 1.70 1.73 1.65 1.75 max633_us16d_ 1.57 1.60 1.63 1.55 1.65 reset threshold suffix table 1. factory-trimmed reset thresholds* figure 2. ensuring reset valid down to v cc = 0 (figure 2a). the pull-down resistor value is not critical; 100k ? is large enough not to load reset , and small enough to pull it low. for the max6335, where reset must be valid to v cc = 0, a 100k ? pull-up resistor between reset and v cc will hold reset high when v cc falls below 0.7v (figure 2b). since the max6337 has an open-drain, active-low out- put, it typically uses a pull-up resistor. with this device, reset will most likely not maintain an active condition, but will drift to a non-active level due to the pull-up resistor and the reduced sinking capability of the open- drain device. therefore, this device is not recommend- ed for applications where the reset pin is required to be valid down to v cc = 0.
max6335/max6336/max6337 4-pin, ultra-low-voltage, low-power p reset circuits with manual reset 6 _______________________________________________________________________________________ part output stage nominal v th (v) minimum reset timeout (ms) sot top mark max6335 us23d3-t push/pull reset 2.30 100 kabq max6335us22d3-t push/pull reset 2.20 100 kaar max6335us20d3-t push/pull reset 2.00 100 kabp max6335us18d3-t push/pull reset 1.80 100 kaaq max6335us16d3-t push/pull reset 1.60 100 kaap max6336 us23d3-t push/pull reset 2.30 100 kaaw max6336us22d3-t push/pull reset 2.20 100 kaav max6336us20d3-t push/pull reset 2.00 100 kaau max6336us18d3-t push/pull reset 1.80 100 kaat max6336us16d3-t push/pull reset 1.60 100 kaas max6337 us23d3-t open-drain reset 2.30 100 kabs max6337us22d3-t open-drain reset 2.20 100 kaaz max6337us20d3-t open-drain reset 2.00 100 kabr max6337us18d3-t open-drain reset 1.80 100 kaay max6337us16d3-t open-drain reset 1.60 100 kaax selector guide (standard versions * ) 1 2 4 3 v cc mr (reset) gnd max6335 max6336 max6337 sot143 top view reset ( ) are for max6335 max6335 max6336 v cc v cc reset mr reset gnd pushbutton switch v cc gnd p (reset) ( ) are for max6335 pin configuration t ypical operating circuit * sample stock is generally held on all standard versions.
4-pin, ultra-low-voltage, low-power p reset circuits with manual reset transistor count: 505 chip information sot-143 4l.eps e 1 1 21-0052 package outline, sot-143, 4l package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) 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 _____________________ 7 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. max6335/max6336/max6337
mouser electronics authorized distributor click to view pricing, inventory, delivery & lifecycle information: maxim integrated: ? max6335us16d1+t? max6335us16d2+t? max6335us16d3+t? max6335us17d1+t? max6335us17d2+t? max6335us17d3+t? max6335us18d1+t? max6335us18d2+t? max6335us18d3+t? max6335us19d1+t? max6335us19d2+t? max6335us19d3+t? max6335us20d1+t? max6335us20d2+t? max6335us20d3+t? max6335us21d1+t? max6335us21d2+t? max6335us21d3+t? max6335us22d1+t? max6335us22d2+t? max6335us22d3+t? max6335us23d1+t? max6335us23d2+t? max6335us23d3+t? max6335us24d1+t? max6335us24d2+t? max6335us24d3+t? max6335us25d1+t? max6335us25d2+t? max6335us25d3+t? max6336us16d1+t? max6336us16d2+t? max6336us16d3+t? max6336us17d1+t? max6336us17d2+t? max6336us17d3+t? max6336us18d1+t? max6336us18d2+t? max6336us18d3+t? max6336us19d1+t? max6336us19d2+t? max6336us19d3+t? max6336us20d1+t? max6336us20d2+t? max6336us20d3+t? max6336us21d1+t? max6336us21d2+t? max6336us21d3+t? max6336us22d1+t? max6336us22d2+t? max6336us22d3+t? max6336us23d1+t? max6336us23d2+t? max6336us23d3+t? max6336us24d1+t? max6336us24d2+t? max6336us24d3+t? max6336us25d1+t? max6336us25d2+t? max6336us25d3+t? max6337us16d1+t? max6337us16d2+t? max6337us16d3+t? max6337us17d1+t? max6337us17d2+t? max6337us17d3+t? max6337us18d1+t? max6337us18d2+t? max6337us18d3+t? max6337us19d1+t? max6337us19d2+t? max6337us19d3+t? max6337us20d1+t? max6337us20d2+t? max6337us20d3+t? max6337us21d1+t? max6337us21d2+t? max6337us21d3+t? max6337us22d1+t? max6337us22d2+t? max6337us22d3+t? max6337us23d1+t? max6337us23d2+t? max6337us23d3+t? max6337us24d1+t? max6337us24d2+t? max6337us24d3+t? max6337us25d1+t? max6337us25d2+t? max6337us25d3+t
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