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general description the max6895?ax6898 is a family of small, low-power, voltage-monitoring circuits with sequencing capability. these miniature devices offer tremendous flexibility with an adjustable threshold capable of monitoring down to 0.5v and an external capacitor-adjustable time delay. these devices are ideal for use in power-supply sequencing, reset sequencing, and power-switching applications. multiple devices can be cascaded for complex sequencing applications. a high-impedance input with a 0.5v threshold allows an external resistive divider to set the monitored threshold. the output asserts (out = high or out = low) when the input voltage rises above the 0.5v threshold and the enable input is asserted (enable = high or enable = low). when the voltage at the input falls below 0.5v or when the enable input is deasserted (enable = low or enable = high), the output deasserts (out = low or out = high). all devices provide a capacitor-program- mable delay time from when the input rises above 0.5v to when the output is asserted. the max689_a versions provide the same capacitor-adjustable delay from when enable is asserted to when the output asserts. the max689_p devices have a 1? propagation delay from when enable is asserted to when the output asserts. the max6895a/p offers an active-high enable input and an active-high push-pull output. the max6896a/p offers an active-low enable input and an active-low push-pull output. the max6897a/p offers an active- high enable input and an active-high open-drain output. finally, the max6898a/p offers an active-low enable input and an active-low open-drain output. all devices operate from a 1.5v to 5.5v supply voltage and are fully specified over the 0? to +125? operat- ing temperature range. each device is available in an ultra-small 6-pin ?fn (1.0mm x 1.5mm) package. applications automotive computers/servers medical equipment critical ? monitoring intelligent instruments set-top boxes portable equipment telecom features ? 1.75% accurate adjustable threshold over temperature ? operate from v cc of 1.5v to 5.5v ? capacitor-adjustable delay ? active-high/-low enable input options ? active-high/-low output options ? open-drain (28v tolerant)/push-pull output options ? low supply current (10?, typ) ? fully specified from 0? to +125? ? ultra-small 6-pin ?fn package (1.5mm x 1.0mm x 0.8mm) max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits ________________________________________________________________ maxim integrated products 1 123 654 out v cc cdelay enable in gnd max6895 max6897 dfn top view pin configurations ordering information part temp range pin- package top mark max6895 aalt-t 0c to +125c 6 ?fn-6 aw max6895palt-t 0c to +125c 6 ?fn-6 ax max6896 aalt-t 0c to +125c 6 ?fn-6 ay max6896palt-t 0c to +125c 6 ?fn-6 az max6897 aalt-t 0c to +125c 6 ?fn-6 ba max6897palt-t 0c to +125c 6 ?fn-6 bb max6898 aalt-t 0c to +125c 6 ?fn-6 bd max6898palt-t 0c to +125c 6 ?fn-6 bc 19-3673; rev 0; 5/05 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. typical operating circuit and selector guide appear at end of data sheet. pin configurations continued at end of data sheet.
max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = 1.5v to 5.5v, t a = 0? to +125?, unless otherwise specified. typical values are at v cc = 3.3v and t a = +25?, unless otherwise noted.) (note 1) 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. v cc , enable, enable , in......................................-0.3v to +6v out, out (push-pull) ................................-0.3v to (v cc + 0.3v) out, out (open-drain)..........................................-0.3v to +30v cdelay......................................................-0.3v to (v cc + 0.3v) output current (all pins) ...................................................?0ma continuous power dissipation (t a = +70?) 6-pin ?fn (derate 2.1mw/ o c above +70?)...........167.7mw operating temperature range.............................0? to +125? storage temperature range .............................-65? to +150? junction temperature ......................................................+150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units supply operating voltage range v cc 1.5 5.5 v undervoltage lockout (note 2) uvlo v cc falling 1.20 1.35 v v cc supply current i cc v cc = 3.3v, no load 10 20 ? in threshold voltage v th v in rising, 1.5v < v cc < 5.5v 0.491 0.5 0.509 v hysteresis v hyst v in falling 5 mv input current (note 3) i in v in = 0v or v cc -15 +15 na cdelay delay charge current i cd 200 250 300 na delay threshold v tcd cdelay rising 0.95 1.00 1.05 v cdelay pulldown resistance r cdelay 130 500 ? enable/ enable input low voltage v il 0.4 v input high voltage v ih 1.4 v input leakage current i leak enable, enable = v cc or gnd -100 +100 na
max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits _______________________________________________________________________________________ 3 note 1: all devices are production tested at t a = +25?. limits over temperature are guaranteed by design. note 2: when v cc falls below the uvlo threshold, the outputs will deassert (out goes low, out goes high). when v cc falls below 1.2v, the output state cannot be determined. note 3: guaranteed by design. note 4: during the initial power-up, v cc must exceed 1.5v for at least 2ms before the output is guaranteed to be in the correct state. electrical characteristics (continued) (v cc = 1.5v to 5.5v, t a = 0? to +125?, unless otherwise specified. typical values are at v cc = 3.3v and t a = +25?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units out/ out v cc 1.2v, i sink = 90?, max6895/max6897 only 0.3 v cc 2.25v, i sink = 0.5ma 0.3 output low voltage (open-drain or push-pull) v ol v cc 4.5v, i sink = 1ma 0.4 v v cc 2.25v, i source = 500? 0.8 x v cc output high voltage (push-pull) v oh v cc 4.5v, i source = 800? 0.8 x v cc v output open-drain leakage current i lkg output high impedance, v out = 28v 1 a timing c cdelay = 0 40 s t delay v in rising c cdelay = 0.047? 190 ms in to out/ out propagation delay t dl v in falling 16 ? startup delay (note 4) 2ms enable/ enable minimum input pulse width t pw 1s enable/ enable glitch rejection 100 ns enable/ enable to out/ out delay t off from device enabled to device disabled 150 ns t propp from device disabled to device enabled (p version) 150 ns c cdelay = 0 20 s enable/ enable to out/ out delay t propa from device disabled to device enabled (a version) c cdelay = 0.047? 190 ms
max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits 4 _______________________________________________________________________________________ t ypical operating characteristics (v cc = 3.3v and t a = +25?, unless otherwise noted.) supply current vs. supply voltage max6895 toc01 v cc (v) i cc ( a) 5.0 4.5 3.5 4.0 1.0 1.5 2.0 2.5 3.0 0.5 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 1 0 5.5 supply current vs. temperature max6895 toc02 temperature ( c) i cc ( a) 110 95 65 80 -10 5 20 35 50 -25 2 4 6 8 10 12 14 16 18 20 0 -40 125 v cc = 5v v cc = 3v v cc = 1.5v in threshold vs. temperature max6895 toc03 temperature ( c) v th (v) 110 95 65 80 -10 5 20 35 50 -25 0.4992 0.4994 0.4996 0.4998 0.5000 0.5002 0.5004 0.5006 0.5008 0.5010 0.4990 -40 125 out delay vs. c cdelay max6895 toc04 c cdelay (nf) t delay (ms) 900 800 600 700 200 300 400 500 100 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 0 0 1000 output low voltage vs. sink current max6895 toc05 i sink (ma) v ol (v) 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.3 0.6 0.9 1.2 1.5 0 0 6.0 v cc = 5v v cc = 3v v cc = 1.5v output high voltage vs. source current max6895 toc06 i source (ma) v oh (v) 18 16 12 14 4 6 8 10 2 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 020 v cc = 5v v cc = 3v v cc = 1.5v maximum transient duration vs. input overdrive max6895 toc07 v overdrive (mv) maximum transient duration ( s) 90 80 70 60 50 40 30 20 10 100 200 300 400 500 600 0 0 100 reset occurs enable turn-on/off (max6896p) max6895 toc08 100ns/div out 2v/div enable 2v/div enable turn-on/off delay (max6895a) max6895 toc09 40 s/div out 2v/div enable 2v/div
max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits _______________________________________________________________________________________ 5 pin description pin max6895/ max6897 max6896/ max6898 name function 1 enable active-high logic-enable input. drive enable low to immediately deassert the output to its false state (out = low or out = high) independent of v in . with v in above v th , drive enable high to assert the output to its true state (out = high or out = low) after the adjustable delay period (max689_a) or a 150ns propagation delay (max689_p). ? enable active-low logic-enable input. drive enable high to immediately deassert the output to its false state (out = low or out = high) independent of v in . with v in above v th , drive enable low to assert the output to its true state (out = high or out = low) after the adjustable delay period (max689_a) or a 150ns propagation delay (max689_p). 22 gnd ground 33in high-impedance monitor input. connect in to an external resistive divider to set the desired monitored threshold. the output changes state when v in rises above 0.5v and when v in falls below 0.495v. 4 out active-high sequencer/monitor output, push-pull (max6895) or open-drain (max6897). out is asserted to its true state (out = high) when v in is above v th and the enable input is in its true state (enable = high or enable = low) for the capacitor-adjusted delay period. out is deasserted to its false state (out = low) immediately after v in drops below v th - 5mv or the enable input is in its false state (enable = low or enable = high). the open-drain version requires an external pullup resistor. ? out active-low sequencer/monitor output, push-pull (max6896) or open-drain (max6898). out is asserted to its true state ( out = low) when v in is above v th and the enable input is in its true state (enable = high or enable = low) for the cdelay adjusted timeout period. out is deasserted to its false state ( out = high) immediately after v in drops below v th - 5mv or the enable input is in its false state (enable = low or enable = high). the open-drain version requires an external pullup resistor. 55 cdelay capacitor-adjustable delay. connect an external capacitor (c cdelay ) from cdelay to gnd to set the in to out (and enable to out or enable to out for a version devices) delay period. t delay = (c cdelay x 4.0 x 10 6 ) + 40?. there is a fixed short delay (40?, typ) for the output deasserting when v in falls below v th . 66v cc supply voltage input. connect a 1.5v to 5.5v supply to v cc to power the device. for noisy systems, bypass with a 0.1? ceramic capacitor to gnd.
max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits 6 _______________________________________________________________________________________ detailed description the max6895?ax6898 is a family of ultra-small, low- power, sequencing/supervisory circuits. these devices provide adjustable voltage monitoring for inputs down to 0.5v. they are ideal for use in power-supply sequenc- ing, reset sequencing, and power-switching applica- tions. multiple devices can be cascaded for complex sequencing applications. voltage monitoring is performed through a high-imped- ance input (in) with an internally fixed 0.5v threshold. when the voltage at in falls below 0.5v or when the enable input is deasserted (enable = low or enable = high), the output deasserts (out goes low or out goes high). when v in rises above 0.5v and the enable input is asserted (enable = high or enable = low), the output asserts (out goes high or out goes low) after a capaci- tor-programmable time delay. with v in above 0.5v, the enable input can be used to turn the output on or off. after the enable input is assert- ed, the output turns on with a capacitor-programmable delay period (a version) or with a 150ns propagation delay (p version). tables 1 and 2 detail the output state depending on the various input and enable conditions. supply input (v cc ) the device operates with a v cc supply voltage from 1.5v to 5.5v. to maintain a 1.75% accurate threshold, v cc must be above 1.5v. when v cc falls below the uvlo threshold, the output deasserts. when v cc falls below 1.2v the output state cannot be determined. for noisy systems, connect a 0.1? ceramic capacitor from v cc to gnd. for the push-pull active-high output option, a 100k ? external pulldown resistor to ground ensures the correct logic state for v cc down to 0. monitor input (in) connect the center point of a resistive divider to in to monitor external voltages (see r1 and r2 of the typical operating circuit ). in has a rising threshold of v th = 0.5v and a falling threshold of 0.495v (5mv hysteresis). when v in rises above v th and enable is high (or enable is low) out goes high ( out goes low) after the programmed t delay period. when v in falls below 0.495v, out goes low ( out goes high) after a 16? delay. in has a maximum input current of 15na so large-value resistors are permitted without adding sig- nificant error to the resistive divider. max6895 logic 1.0v 250na 0.5v in out cdelay gnd enable v cc in enable out v in < v th low low v in < v th high low v in > v th low low out = v cc (max6895) v in > v th high out = high impedance (max6897) figure 1. max6895 functional diagram table 1. max6895/max6897 output in enable out out = v cc (max6896) v in < v th low out = high impedance (max6898) out = v cc (max6896) v in < v th high out = high impedance (max6898) v in > v th low low out = v cc (max6896) v in > v th high out = high impedance (max6898) table 2. max6896/max6898 output
adjustable delay (cdelay) when v in rises above v th with enable high ( enable low), the internal 250na current source begins charging an external capacitor connected from cdelay to gnd. when the voltage at cdelay reaches 1v, the output asserts (out goes high or out goes low). when the output asserts, c cdelay is immediately discharged. adjust the delay (t delay ) from when v in rises above v th (with enable high or enable low) to out going high ( out going low) according to the equation: t delay = c cdelay x 4.0 x 10 -6 + 40? where c cdelay is the external capacitor from cdelay to gnd. for adjustable delay devices (a version), when v in > 0.5v and enable goes from low to high ( enable goes from high to low) the output asserts after a t delay period. for nonadjustable delay devices (p version) there is a 1? propagation delay from when the enable input is asserted to when the output asserts. figures 2 through 5 show the timing diagrams for the adjustable and fixed delay versions, respectively. max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits _______________________________________________________________________________________ 7 figure 2. max6895a/max6897a timing diagram v cc v uvlo v th v th t propa t dl t off t delay t < t propa t propa in enable out
max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits 8 _______________________________________________________________________________________ figure 3. max6896a/max6898a timing diagram v cc v uvlo t propa t dl t off t delay t < t propa t propa in enable out figure 4. max6895p/max6897p timing diagram v cc v uvlo t propp t dl t off t delay t > t pw t propp in enable out
enable input (enable or enable ) the max6895/max6897 offer an active-high enable input (enable), while the max6896/max6898 offer an active-low enable input ( enable ). with v in above v th , drive enable high ( enable low) to force out high ( out low) after the adjustable delay time (a versions). for p version devices, when v in > 0.5v and enable is asserted, the output asserts after typically 150ns. the enable input has logic-high and logic-low voltage thresholds of 1.4v and 0.4v, respectively. for both ver- sions, when v in > 0.5v, drive enable low ( enable high) to force out low ( out high) within 150ns typ. output (out or out ) the max6895 offers an active-high, push-pull output (out), and the max6896 offers an active-low push-pull output ( out ). the max6897 offers an active-high open-drain output (out), and the max6898 offers an active-low open-drain output ( out ). push-pull output devices are referenced to v cc . open- drain outputs can be pulled up to 28v. applications information input threshold the max6895?ax6898 monitor the voltage on in with an external resistive divider (see r1 and r2 in the typical operating circuit ). r1 and r2 can have very high values to minimize current consumption due to low in leakage currents (?5na max). set r2 to some con- veniently high value (1m ? , for example) and calculate r1 based on the desired monitored voltage using the following formula: where v monitor is the desired monitored voltage and v in is the detector input threshold (0.5v). rr v v monitor in 12 1 = ? ? ? ? ? ? ? max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits _______________________________________________________________________________________ 9 figure 5. max6896p/max6898p timing diagram v cc v uvlo t propp t dl t off t delay t > t pw t propp in enable out
max6895?ax6898 pullup resistor values (max6897/max6898) the exact value of the pullup resistors for the open- drain outputs is not critical, but some consideration should be made to ensure the proper logic levels when the device is sinking current. for example, if v cc = 2.25v and the pullup voltage is 28v, you would try to keep the sink current less than 0.5ma as shown in the electrical characteristics table. as a result, the pullup resistor should be greater than 56k ? . for a 12v pullup, the resistor should be larger than 24k ? . it should be noted that the ability to sink current is dependent on the v cc supply voltage. typical application circuits figures 6, 7, 8 show typical applications for the max6895?ax6898. figure 6 shows the max6895 used with a p-channel mosfet in an overvoltage pro- tection circuit. figure 7 shows the max6895 in a low- voltage sequencing application using an n-channel mosfet. figure 8 shows the max6895 used in a multi- ple-output sequencing application. using an n-channel device for sequencing in higher power applications, using an n-channel device reduces the loss across the mosfets as it offers a lower drain-to-source on-resistance. however, an n- channel mosfet requires a sufficient v gs voltage to fully enhance it for a low r ds_on . the application in figure 7 shows the max6895 in a switch sequencing application using an n-channel mosfet. similarly, if a higher voltage is present in the system, the open-drain version can be used in the same manner. ultra-small, adjustable sequencing/supervisory circuits 10 ______________________________________________________________________________________ figure 6. overvoltage protection max6897 enable gnd v cc p 3.3v always on out r1 0 to 28v r pullup r2 in cdelay max6895 enable gnd v cc 5v bus out r1 r2 in cdelay c cdelay 1.2v input 1.2v output n monitored 3.3v figure 7. low-voltage sequencing using an n-channel mosfet
max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits ______________________________________________________________________________________ 11 figure 8. multiple-output sequencing c cdelay c cdelay gnd gnd gnd gnd out out out out in in in in v cc v cc v cc v cc enable enable enable enable en en en en dc-dc 3.3v 5v bus system enable 2.5v 1.8v 1.2v dc-dc dc-dc dc-dc c cdelay c cdelay max6895 max6895 max6895 max6895 selector guide part enable input output input (in) delay enable delay max6895aalt active-high active-high, push-pull capacitor adjustable capacitor adjustable max6895palt active-high active-high, push-pull capacitor adjustable 150ns delay max6896aalt active-low active-low, push-pull capacitor adjustable capacitor adjustable max6896palt active-low active-low, push-pull capacitor adjustable 150ns delay max6897aalt active-high active-high, open-drain capacitor adjustable capacitor adjustable max6897palt active-high active-high, open-drain capacitor adjustable 150ns delay max6898aalt active-low active-low, open-drain capacitor adjustable capacitor adjustable max6898palt active-low active-low, open-drain capacitor adjustable 150ns delay
max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits 12 ______________________________________________________________________________________ chip information process: bicmos pin configurations (continued) max6895 enable gnd v cc out r1 1.5v to 5.5v r2 in cdelay c cdelay 123 654 out v cc cdelay enable in gnd max6896 max6898 dfn top view t ypical operating circuit
max6895?ax6898 ultra-small, adjustable sequencing/supervisory circuits 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 ____________________ 13 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. 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 .) 6l udfn.eps l top view d e side view a1 pin 1 index area a a 0.64 common dimensions pin 1 0.075x45 bottom view l1 32 min. 1 e 6 5 b 4 section a-a b l2 a a nom. 0.72 0.80 max. 0.20 -- a1 -- 1.50 1.45 d 1.55 1.00 0.95 e 1.05 0.35 0.30 l 0.40 -- -- l1 0.08 -- -- l2 0.05 0.20 0.17 b 0.23 0.50 bsc. e aaa topmark 2 1 -drawing not to scale- document control no. approval title: rev. package outline, 6l udfn, 1.5x1.0x0.8mm 21-0147 1 1 c 3

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