advanced power electronics corp. ape6809_6812 3pin microprocessor reset circuit features description precision monitoring of +2.5, +3v, +3.3v, and +5v power-supply voltages fully specified over temperature available in three output configurations push-pull low output(ape6809/ape6811) push-pull reset high output(ape6810/ape6812) 200ms (typ.)min power-on reset pulse width 25a supply current guaranteed reset valid to vcc = +1.0v power supply transient immunity no external components available in the 3-pin pb-free sot-23 and sc-70 package data and specifications subject to change without notice 201102212 typical application package / ordering information 1 the ape6809_6812 are used for microprocessor (p) supervisory circuits to monitor the power supplies in p and digital systems. they provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5v, +3.3v, +3.0v, +2.5v powered circuits. these circuits perform a single function: they assert a reset signal whenever the vcc supply voltage declines below a preset threshold, keeping it asserted for at least 200ms after vcc has risen above the reset threshold. reset threshold s suitable for operation with a variety of supply voltages are available. the ape6809_6812 have push pull outputs. the a pe6809/ape6811 have an active low reset output, whil e the ape6810_6812 has an active high reset output. the reset comparator is designed to ignore fast transients on vcc, and the outputs are guaranteed to be in the correc t logic state for vcc down to 1.0v. low supply current makes the ape6809_6812 ideal for use in portable equipment. the a pe6809_6812 is available in a 3-pin sot-23 and sc-7 0 package. (top view) 1 2 gnd v cc sot-23/sc-70 ape6809 ape6810 2 3 (top view) 1 2 gnd v cc sot-23/sc-70 ape6811 ape6812 2 3 (reset) reset (reset) reset ape68xx x - x enable 09 : active-low 10 : active-high a: 4.63 b: 4.38 c: 4.00 d: 3.08 e: 2.93 f: 2.63 g: 2.25 h: 2.70 i:4.25 package n : sot-23 u : sc-70 11 : active-low 12 : active-high voltage ape68xx gnd reset (reset) vcc microprocessor vcc gnd reset input vcc reset
advanced power electronics corp. ape6809_6812 absolute maximum ratings (at t a =25c) vcc pin voltage (v cc ) ----------------------------------- gnd - 0.3v to gnd + 6.5v reset, reset(push-pull) pin voltage (v reset ) - - gnd - 0.3v to vcc + 0.3v input current, v cc (i cc ) ----------------------------------- - 20ma output current, reset, reset (i o ) ----------------- - 5ma power dissipation(p d ) ------------------------------------ - ( tj-ta ) / rthja storage temperature range(t st ) --------------------- - -60c to 150c operating temperature range(t op ) ------------------ - -40c to 85c junction temperature(t j ) ------------------------------- - -40c to 150c 110 o c/w 250 o c/w note. rth ja is measured with the pcb copper area of approximately 1 in 2 (multi-layer). that need connect to gnd pin. electrical specifications (v dd =2.75v, t a =25 , unless otherwise specified) parameter sym test condition min typ max units operating vcc range v range 1-6 v supply current i cc v cc = v th +1.0v - 25 35 a ape6809_6812a 4.54 4.63 4.71 ape6809_6812b 4.29 4.38 4.46 ape6809_6812i 4.16 4.25 4.33 ape6809_6812c 3.92 4 4.08 ape6809_6812d 3.02 3.08 3.15 ape6809_6812e 2.87 2.93 3 ape6809_6812h 2.64 2.7 2.75 ape6809_6812f 2.57 2.63 2.69 ape6809_6812g 2.2 2.25 2.3 reset threshold tempco v tht t a = 0 o c to +85 o c - 50 - ppm/ o c set-up time t s v cc = 0 to (v th ? 100mv) 1 - - s vcc to reset delay t rd vcc=v th to (v th -100mv) - 20 - s reset active timeout period t delay t a = 0 o c to +85 o c 160 200 260 ms 1.8v v th (max) , i source = 500ua, 0.8 v cc -- v reset v ol v cc > v th (max) , i sink = 1.2ma, - - 0.3 v output voltage 1.8v < v cc < v th (min) , i source = 500ua (ape6810/ape6812) 1.2v < v cc < 1.8v, i source = 150ua hysteresis at v cc v hys input voltage - 40 - mv - - 0.3 v v oh 0.8 v cc -- 2 thermal resistance from junction to case(rth jc ) thermal resistance from junction to ambient(rth ja ) note v th v v ol v reset threshold t a =25 o c reset
advanced power electronics corp. ape6809_6812 pin descriptions pin symbol pin description vcc operating voltage input gnd ground reset output pin l: for ape6809/ape6811 h: for ape6810/ape6812 block diagram function description application information negative-going vcc transients 3 reset/(reset) vref delay circuit reset / reset gnd vcc + - p-mos n-mos a microprocessor?s (p?s) reset input starts the p in a known state. the ape6809_6812 asserts reset to prevent code-execution errors during power-up, power-down, or brownout conditions. they assert a reset signal whenever the vcc supply voltage declines below a preset threshold, keeping it asserted for at least 200ms after vcc has risen above the reset threshold. the ape6809_6812 has a push-pull output stage. in addition to issuing a reset to the p during power-up, power-down, and brownout conditions, the ape6809_6812 is relatively immune to short-duration negative-going vcc transients (glitches). the ape6809_6812 does not generate a reset pulse. the graph was generated using a negative going pulse applied to vcc, starting 0.5v above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). the graph indicates the maximum pulse width a negative going vcc transient can have without causing a reset pulse. as the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. typically, a vcc transient that goes 50mv below the reset threshold a 0.1f bypass capacitor mounted as close as possible to the vcc pin provides additional transient immunity.
advanced power electronics corp. ape6809_6812 application information ensuring a valid reset output down to vcc = 0 ensuring a valid reset output down to vcc = 0 4 reset is guaranteed to be a logic low for vcc > 1.0v. once vcc exceeds the reset threshold, an internal timer keeps reset low for the reset timeout period; after this interval, reset goes high. if a brownout condition occurs (vcc dips below the reset threshold), reset goes low. any time vcc goes below the reset threshold, the internal timer resets to zero, and reset goes low. the internal timer starts after vcc returns above the reset threshold, and reset remains low for the reset timeout period. when vcc falls below 1.0v, the ape6809/ape6811 reset output no longer sinks current?it becomes an open circuit. therefore, high-impedance cmos logic inputs connected to reset can drift to undetermined voltages. this presents no problem in most applications since most p and other circuitry is inoperative with vcc below 1.0v. however, in applications where reset must be valid down to 0v, adding a pull down resistor to causes any stray leakage currents to flow to ground, holding reset low. r1?s value is not critical; 100k is large enough not to load reset and small enough to pull reset to ground. for the ape6810/ape6812 if reset is required to remain valid for vcc < 1.0v. most p supervisor ics has reset threshold voltages between 5% and 10% below the value of nominal supply voltages. this ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. when using ics rated at only the nominal supply 5%, this leaves a zone of uncertainty where the supply is between 5% and 10% low, and where the reset may or may not be asserted.
advanced power electronics corp. ape6809_6812 typical performance characteristics 5 2.9 2.91 2.92 2.93 2.94 2.95 2.96 -50 -25 0 25 50 75 100 threshold volta g e ( v ) temperature () temperature vs threshold voltage v th =2.93v 150 160 170 180 190 200 210 220 230 240 250 -50 -25 0 25 50 75 100 reset active tim eout period ( ms ) temperature () temperature vs reset active timeout period 20 22 24 26 28 30 32 34 -50 -25 0 25 50 75 100 reset acsu pp l y current ( ua ) temperature () temperature vs supply current v th =2.93v 20 22 24 26 28 30 32 34 2.25 2.63 2.93 3.08 4 4.38 4.63 su pp l y current ( ua ) threshold voltage (v) threshold voltage vs supply current v cc =v th +1v 0 5 10 15 20 25 30 35 40 45 50 -50-250 255075100 temperature vs power-down reset delay power-down reset dela y ( us ) temperature () v th =2.25v v od =v th -v cc v od =50mv v od =100mv v od =200mv 0 5 10 15 20 25 30 35 40 45 50 -50 -25 0 25 50 75 100 temperature vs power-down reset delay power-down reset dela y ( us ) temperature () v th =2.93v v od =v th -v cc v od =100mv v od =50mv v od =200mv
advanced power electronics corp. ape6809_6812 typical performance characteristics timing diagram 6 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 temperature vs power-down reset delay power-down reset dela y ( us ) temperature () v th =4.63v v od =v th -v cc v od =50mv v od =200mv v od =100mv giltch immunity 3000 900 270 140 90 70 58 50 50 48 48 0 500 1000 1500 2000 2500 3000 3500 0 100 200 300 400 500 600 700 800 900 1000 1100 reset comparator overdrive(mv) maximum transient duration(us)
advanced power electronics corp. ape6809_6812 marking information sot-23 appendix-1 sc-70 appendix-2 7 part number identification code part number identification code APE6809N-A ca ape6811n-a co ape6809n-b cb ape6811n-b cp ape6809n-c cc ape6811n-c cq ape6809n-d cd ape6811n-d cr ape6809n-e ce ape6811n-e cs ape6809n-f cf ape6811n-f ct ape6809n-g cg ape6811n-g cu ape6809n-h ca ape6811n-h cf ape6809n-i cb ape6811n-i cg ape6810n-a ch ape6812n-a c1 ape6810n-b ci ape6812n-b c2 ape6810n-c cj ape6812n-c c3 ape6810n-d ck ape6812n-d c4 ape6810n-e cl ape6812n-e c5 ape6810n-f cm ape6812n-f c6 ape6810n-g cn ape6812n-g c7 ape6810n-h cd ape6812n-h ch ape6810n-i ce ape6812n-i cm part number identification code part number identification code ape6809u-a a ape6811u-a o ape6809u-b b ape6811u-b p ape6809u-c c ape6811u-c q ape6809u-d d ape6811u-d r ape6809u-e e ape6811u-e s ape6809u-f f ape6811u-f t ape6809u-g g ape6811u-g u ape6809u-h 3 ape6811u-h 7 ape6809u-i 4 ape6811u-i 8 ape6810u-a h ape6812u-a v ape6810u-b i ape6812u-b w ape6810u-c j ape6812u-c x ape6810u-d k ape6812u-d y ape6810u-e l ape6812u-e z ape6810u-f m ape6812u-f 1 ape6810u-g n ape6812u-g 2 ape6810u-h 5 ape6812u-h 9 ape6810u-i 6 ape6812u-i 0 part number : && (see appendix-1) year : a = 2010 1 = 2011 week: a~z : 01~26 a~z : 27~52 id code : internal &&yws part number : & (see appendix-2) year : a = 2010 1 = 2011 week: a~z : 01~26 a~z : 27~52 &yw
package outlines sot-23-3l l e e1 e d a2 a1 b a view c l1 e1 gauge plane c see view c dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 1.05 - 1.45 0.041 - 0.057 a1 0.05 - 0.15 0.002 - 0.006 a2 0.90 1.10 1.30 0.035 0.043 0.051 b 0.30 - 0.50 0.012 - 0.020 c 0.08 - 0.20 0.003 - 0.008 d 2.70 2.90 3.10 0.106 0.114 0.122 e 2.60 2.80 3.00 0.102 0.110 0.118 e1 1.40 1.60 1.80 0.055 0.063 0.071 l 0.30 - 0.60 0.012 - 0.024 l1 0.50 0.60 0.70 0.020 0.024 0.028 e 1.80 1.90 2.00 0.071 0.075 0.079 e1 0.85 1.00 1.15 0.033 0.039 0.045 0 o 5 o 10 o 0 o 5 o 10 o advanced power electronics corp. ape6809_6812
sc-70-3l dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 0.80 - 1.10 0.031 - 0.043 a1 0.00 - 0.10 0.000 - 0.004 a2 0.70 0.90 1.00 0.280 0.035 0.039 b 0.25 - 0.40 0.010 - 0.016 c 0.08 - 0.22 0.003 - 0.009 d 1.80 2.00 2.20 0.071 0.079 0.087 e 1.95 2.10 2.25 0.077 0.083 0.089 e1 1.15 1.25 1.35 0.045 0.049 0.053 e - 1.30 - - 0.051 - l 0.26 0.36 0.46 0.010 0.014 0.018 l2 - 0.15 - - 0.006 - y - - 0.10 - - 0.004
|
