p roduction d ata s he et microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2003 rev. 1.1, 2009-02-11 www. microsemi . com lx6433 precision volta g e monitor tm ? description the lx6433 is a precise voltage monitor programmed to signal a low supply line condition. vmon is connected to the ?monitored? supply line, when vmon drops below the threshold of 1.085v, reset line goes low. when power is restored and vmon moves above the threshold voltage, reset remains low for an additional 100ms to ensure system reset is fully applied. digital filtering inside the lx6433 ignores temporary dips in the vmon line lasting for less than 10s to avoid false triggering. the monitor operates over a supply range (vin) of 3v to 6v. the reset line is capable of sinking an output load current of 1ma. this line is protected from short circuit to vin or ground without damage. tight threshold detection allows for a 1.085v to 1.125v window over temperature. system efficiency is maintained with ultra low iq of 20a. the 5 pin sot-23 package provides a small form factor similar to industry standard device types in this category. this package is rohs compliant allowing pb free pcb assembly. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com key features ? precise threshold detection 1.105v 0.02v ? 3v to 6.0v operating range ? active low reset, sink current > 1ma ? reset pulse duration controlled, typical 100ms ? quiescent current < 40 a ? wide temperature: 0-85c ? no external components required ? sot-23, 5-pin package, rohs compliant (pb-free) ? similar devices: fm803, ncp803 and lm3724 applications/benefits ? portable microprocessor core voltage supply monitor ? supply monitoring: 1.2v, 2.5v, 3.3v, 5v or any other level. product highlight vin vmon reset gnd LX6433CSE r pull-up (optional) 3.3 to 5v vcc reset ground 1.2v supply microprocessor / asic figure 1 ? lx6433 typical application circuit package order information se plastic sot-23 5-pin (pb free) t a ( c) supply voltage (vin) fault detection threshold voltage rohs compliant / pb-free 0 to 85 3 to 6v 1.105v +/-1.8% LX6433CSE note: available in tape & reel. append the le tters ?tr? to the part number. (i.e. LX6433CSE-tr) device marking 2975 l l x x 6 6 4 4 3 3 3 3
p roduction d ata s he et microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2003 rev. 1.1, 2009-02-11 www. microsemi . com lx6433 precision volta g e monitor tm ? absolute maximum ratings input voltage (in) ............................................................................................-0.3v to 7.0v monitor (vmon) ............................................................................................. -0.3v to 7.0v reset to gnd ....................................................................................-0.3v to (v in + 0.3v) operating temper ature ra nge.....................................................................-40 c to +125 c storage temperature range, t a .................................................................... -65 c to 150 c maximum junction temperature..................................................................................150 c rohs / pb-free peak package solder reflow temperature (40 seconds maxi mum expos ure) .................................................................... 260 c (+0,-5) note: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into, ne gative out of specified terminal. thermal data se plastic sot-23 5-pin thermal resistance - junction to a mbient , ja 300 c/w junction temperature calculation: t j = t a + (p d x ja ). the ja numbers are guidelines for the thermal performa nce of the device/pc-board system. all of the above assume no ambient airflow. package pin out vin vmon gnd reset n.c. 1 2 34 5 se p ackage (top view) rohs / pb-free 100% matte tin pin finish functional pin description n ame d escription vin supply voltage, operational from 3.0v to 6.0v. vmon monitored input of 1.2v supply. gnd circuit ground. reset output pin, low level indicates fault mode. electrical characteristics specifications apply over the ambient temperature of: 0 o c < t < 85c for v in = 5v (except where otherwise noted). typical values are at t a =25c. parameter symbol test conditions min typ max units ` operating range vin op functional operation (correct logic state for reset) 3.0 6.0 v reset high vmon th+ vmon rising, reset = high (after timeout cycle is completed) 1.085 v reset low vmon th- vmon falling, reset = low 1.125 v reset pulse duration reset pw time reset remains low after vmon rises above the threshold 50 100 150 ms quiescent current (ground pin) i q reset open 40 a vmon transient reset unchanged for vmon drop below vmon th- 10 s vmon transient filter vmon trigger pw reset activated for momentary dip in vmon below vmon th- 5 s reset vout low v ol i sink = 10ma, v in = 5v 10% .05 0.4 v reset vout low v ol i sink = 20ma, v in = 5v 10% t a 0c to 70c .05 0.4 v reset leakage i lkg vmon > 1.2v, v reset = 5v .02 1 a reset delay after trigger t delay time from vmon falling below threshold to reset going low, vmon overdrive of 50mv. 11 s e e l l e e c c t t r r i i c c a a l l s s
p roduction d ata s he et microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2003 rev. 1.1, 2009-02-11 www. microsemi . com lx6433 precision volta g e monitor tm ? simplified block diagram vmon gnd + - ref clock 1.6mhz divide by 2 4 vin output reset set clock divide by 2 17 negative edge detector reset output pulse qualifier figure 2 ? simplified block diagram 5v 1v 0v vin vmon reset 5v 3v 0v 1.5v 1.0v 0.5v 0.0v ?threshold? t0 t1 t2 t3 t5 t6 t7 t8 t9 t10 t11 t12 t13 t15 t4 t14 t16 t0: reset invalid logic state for vin < 2v t1- t1 vmonitor exceeds threshold, at t1, reset pulse remains low for 100ms until t2. t3 - t4: transient on vin is ignored, less than 10usec duration for vmonitor < threshold. (same applies for *) t5: vmonitor drops below threshold, remains low for > 10usec which activates reset low. t6: vmonitor rises above threshold but previous fault at t5 has not cycled through full timeout (t 6-t7 < 50ms), reset remains low. t7: vmonitor fals below threshold, reset remains low. t7-t8 duration > 10us, reset timer restarted for 100ms timeout t8-t9: duration exceeds 150ms, reset timer cycle completed, output rises t10-t11: vmonitor falls below threshold for > 10us, reset signal goes low. t13-t14, t15-t16 :vmonitor is above threshold, no limits apply for peak voltage or duration. * * * ** * * * 100ms (typ.) 100ms (typ.) 100ms (typ.) figure 3 ? timing diagram b b l l o o c c k k d d i i a a g g r r a a m m
p roduction d ata s he et microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2003 rev. 1.1, 2009-02-11 www. microsemi . com lx6433 precision volta g e monitor tm ? functional description the lx6433 operates as a power supply monitor with a threshold window of 1.085v to 1.125v (1.8%) that can be programmable using external resistors. the vmon pin is the input to the internal comparator and vin is the power source for the ic. the reset pin is an open drain, with active low logic. an external pull- up resistor can be used if the device (asic) driven does not provide this feature. as vmon ramps upwards from zero, reset is held low until vmon exceeds the thr eshold, this starts an internal 100ms timer which continues to hold reset low for that interval. as long as vmon remains above the threshold level and the 100ms timer has completed the cycle, reset remains high (high impedance state). if a transient of less than 10us interrupts vmon causing a drop below the threshold the lx6433 will ignore the event. if vmon does drop below the threshold for greater than 12s the reset will remain low until vmon recovers above the threshold and the reset time pulse has been timed out (100ms). package dimensions se 5 pin plastic sot-23 h g f e a1 j i c k a b d note: 1. controlled dimensions are in mm, inches are for reference only. 2. dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm (.006?) on any side. lead dimension shall not include solder coverage m illimeters i nches dim min max min max a 0.90 1.30 0.035 0.051 a1 0.90 1.45 0.035 0.057 b 0.25 0.50 0.010 0.020 c 0.09 0.20 0.004 0.008 d 2.80 3.10 0.110 0.122 e 1.50 1.75 0.059 0.069 f 0.95 bsc 0.038 bsc g 1.90 bsc 0.075 bsc h 2.60 3.00 0.102 0.118 i 0.35 0.55 0.014 0.022 j 0.00 0.15 0.000 0.006 k 10 max 10 max m m e e c c h h a a n n i i c c a a l l s s
p roduction d ata s he et microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2003 rev. 1.1, 2009-02-11 www. microsemi . com lx6433 precision volta g e monitor tm ? characteristic curves figure 4 reset pulse width after v monitor ?good? figure 5 reset delay after v monitor falls figure 6 v monitor digital filter, reset logic ignores pulse widths of < 5 s figure 7 start-up for vin vin /reset monito r vin monitor /reset vmonitor droop pulse width: 5us 5us 10us 10us vin /reset (vmonitor = 0v) c c h h a a r r t t s s
p roduction d ata s he et microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2003 rev. 1.1, 2009-02-11 www. microsemi . com lx6433 precision volta g e monitor tm ? notes production data ? information contained in this document is proprietary to microsemi and is current as of publication date. this document may not be modified in any way without the express written consent of microsemi. product processing does not necessarily include testing of all parameters. microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. n n o o t t e e s s
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