ap1701/2/3/4 3-pin microprocesso r reset circuits ap1701/2/3/4 rev. 2 1 of 9 february 2007 www.diodes.com ? diodes incorporated ? precision monitoring of +2.5v, +3v, +3.3v, and +5v power-supply voltages ? fully specified over temperature ? available in three output configurations ? push-pull reset low output (ap1701/3) ? push-pull reset high output (AP1702/4) ? 200ms min. power-on reset pulse width ? 20a supply current (typ.) ? guaranteed reset valid to v cc = +1v ? power supply transient immunity ? no external components ? green package: sc59-3l ? lead free finish / rohs compliant (note1) the ap1701/2/3/4 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 powered circuits. these circuits perform a single function: they assert a reset signal whenever the v cc supply voltage declines below a preset threshold, keeping it asserted for at least 240ms after v cc has risen above the reset threshold. reset thresholds suitable for operation with a variety of suppl y voltages are available. the ap1701/2/3/4 have push pull outputs. the ap1701/3 have an active low reset output, while the AP1702/4 has an active high reset output. the reset comparator is designed to ignore fast transients on v cc , and the outputs are guaranteed to be in the correct logic state for v cc down to 1v. low supply current makes the ap1701/2/3/4 ideal for use in portable equipment. the ap1701/2/3/4 is available in a 3-pin sc59 package. ? computers ? controllers ? intelligent instruments ? critical p and c power monitoring ? portable/battery powered equipment ? automotive ap 170x x x x x voltage package packing a : 4.63 b : 4.38 c:4.00 d:3.08 e : 2.93 f:2.63 g : 2.25 w:sc59 -7 : taping enable 1 : active-low 2:active-high 3 : active-low 4:active-high lead free l : lead free g : green notes: 1. rohs revision 13.2.2003. glass and hi gh temperature solder exemptions applied, see eu directive annex notes 5 and 7 . notes: 2. pad layout as shown on diodes in c. suggested pad layout document ap02001, whic h can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. features general description applications ordering information 7? tape and reel device package code packaging (note 2) quantity part number suffix ap170xxw w sc59 3000/tape & reel -7
ap1701/2/3/4 3-pin microprocesso r reset circuits ap1701/2/3/4 rev. 2 2 of 9 february 2007 www.diodes.com ? diodes incorporated (top view) 1 2 gnd v cc ap1703 ap1704 2 3 (reset) reset (top view) 1 2 gnd (reset) v cc ap1701 AP1702 2 3 reset sc59-3l sc59-3l absolute maximum ratings symbol parameter rating unit v cc terminal voltage (with respect to gnd) -0.3 to +6.0 v v reset reset, reset (push-pull) -0.3 to (v cc + 0.3) v i cc input current, v cc 20 ma i o output current, reset, reset 20 ma p d continuous power dissipation (t a = +70c), de-rate 4mw/c above +70c 320 mw t op operating junction temperature range -40 to +105 c t st storage temperature range -65 to +150 c pin assignments pin descriptions name description gnd ground reset (reset) reset output pin l: for ap1701/3 h: for AP1702/4 v cc operating voltage input
ap1701/2/3/4 3-pin microprocesso r reset circuits ap1701/2/3/4 rev. 2 3 of 9 february 2007 www.diodes.com ? diodes incorporated electrical characteristics (t a = 25oc) symbol parameter conditions min. typ. max. unit v cc v cc range t a = 0 o c to +70 o c 1.0 5.5 v i cc supply current v th + 1.0v 20 30 a ap1701/2/3/4a 4.54 4.63 4.72 ap1701/2/3/4b 4.29 4.38 4.47 ap1701/2/3/4c 3.92 4.00 4.08 ap1701/2/3/4d 3.02 3.08 3.14 ap1701/2/3/4e 2.87 2.93 2.99 ap1701/2/3/4f 2.57 2.63 2.68 reset threshold t a = 25oc ap1701/2/3/4g 2.20 2.25 2.30 v v th reset threshold tempco 30 ppm/ o c t s set-up time v cc = 0 to (v th ? 100mv) 100 s t delay reset active timeout period t a = 0 o c to +70 o c 100 240 600 ms v cc = v th min, i sink = 1.2ma, ap1701/3 0.3 v cc = v th min, i sink = 3.2ma 0.4 v ol t rese output voltage low v cc > 1.0v, i sink = 50ua 0.3 v v cc > v th max, i source = 500ua, ap1701/3 0.8v cc v oh t rese output voltage-high v cc > v th max, i source = 800ua v cc ?1.5 v v cc = v th max, i sink = 1.2ma, AP1702/4 0.3 v ol reset output voltage-low v cc = v th max, i sink = 3.2ma 0.4 v v oh reset output voltage-high 1.8v < v cc < v th min, i source = 150ua, AP1702/4 0.8 v cc v typical application circuit ap170x gnd reset (reset) v cc microprocessor v cc gnd reset input v cc cin 0.1uf
ap1701/2/3/4 3-pin microprocesso r reset circuits ap1701/2/3/4 rev. 2 4 of 9 february 2007 www.diodes.com ? diodes incorporated function description a microprocessor?s (p?s) reset input starts the p in a known state. the ap1701/2/3/4 assert reset to prevent code-execution errors during power-up, power-down, or brownout conditions. they assert a reset signal whenever the v cc supply voltage declines below a preset threshold, keeping it asserted for at least 240ms after v cc has risen above the reset threshold. the ap1701/2/3/4 have a push-pull output stage. applications information negative-going v cc transients in addition to issuing a reset to the p during power-up, power-down, and brownout conditions, the ap1701/2/3/4 are relatively immune to short-duration negative-going v cc transients (glitches). the ap1701/2/3/4 do not generate a reset pulse. the graph was generated using a negative going pulse applied to v cc , 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 v cc transient can have without c ausing a reset pulse. as the magnitude of the transient incr eases (goes farther below the reset threshold), the maximum al lowable pulse width decreases. typically, a v cc transient that goes 100mv below the reset threshold and lasts 100s or less will not cause a reset pulse. a 0.1f bypass capacitor mounted as close as possible to the v cc pin provides additional transient immunity. ensuring a valid reset output down to v cc = 0 reset is guaranteed to be a logic low for v cc > 1v. once v cc 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 (v cc dips below the reset threshold), reset goes low. any time v cc goes below the reset threshold, the internal timer resets to zero, and reset goes low. the internal timer starts after v cc returns above the reset threshold, and reset remains low for the reset timeout period. when v cc falls below 1v, the ap1701/3 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 v cc below 1v. however, in applications where reset must be valid down to 0v, adding a pull down resistor to reset causes any stray leakage currents to flow to ground, holding reset low. r1?s value is not critical; 100k are large enough not to load reset and small enough to pull reset to ground. for the AP1702/4 if reset is required to remain valid for v cc < 1v. benefits of highly accurate reset threshold 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 no minal 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. reset block diagram v ref delay circuit driver reset / reset
ap1701/2/3/4 3-pin microprocesso r reset circuits ap1701/2/3/4 rev. 2 5 of 9 february 2007 www.diodes.com ? diodes incorporated performance characteristics -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 iq 24 20 16 12 8 4 0 temp ( c ) iq vs. temp -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 threshold temp 2.92 2.922 2.924 2.926 2.928 threshold vs. temp
ap1701/2/3/4 3-pin microprocesso r reset circuits ap1701/2/3/4 rev. 2 6 of 9 february 2007 www.diodes.com ? diodes incorporated timing diagram t s 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) t delay v cc active low active high t delay t delay t delay v th
ap1701/2/3/4 3-pin microprocesso r reset circuits ap1701/2/3/4 rev. 2 7 of 9 february 2007 www.diodes.com ? diodes incorporated marking information (1) sc59-3l 1 2 3 xx y m x (top view) xx : identification code y : year 0-9 m : month a~l l : lead free package g : green package device package (note 3) identification code ap1701aw sc59 ea ap1701bw sc59 eb ap1701cw sc59 ec ap1701dw sc59 ed ap1701ew sc59 ee ap1701fw sc59 ef ap1701gw sc59 w1 AP1702aw sc59 e0 AP1702bw sc59 e2 AP1702cw sc59 e3 AP1702dw sc59 e4 AP1702ew sc59 e5 AP1702fw sc59 e6 AP1702gw sc59 w2 ap1703aw sc59 eg ap1703bw sc59 eh ap1703cw sc59 ei ap1703dw sc59 ej ap1703ew sc59 ek ap1703fw sc59 el ap1703gw sc59 w3 ap1704aw sc59 e7 ap1704bw sc59 e8 ap1704cw sc59 e9 ap1704dw sc59 em ap1704ew sc59 en ap1704fw sc59 ep ap1704gw sc59 w4 notes: 3. for packaging details, go to our website at http://www.diodes.com/ datasheets/ap02007.pdf .
ap1701/2/3/4 3-pin microprocesso r reset circuits ap1701/2/3/4 rev. 2 8 of 9 february 2007 www.diodes.com ? diodes incorporated package information (all dimensions in mm) (1) package type: sc59-3l 0.35/0.50 0.10/0.20 0.013/0.10 0.35/0.55 0.95 2.70/ 3.00 2.90/3.10 1.00/ 1.30 1.50/ 1.70 1.90 top view 0/8
ap1701/2/3/4 3-pin microprocesso r reset circuits ap1701/2/3/4 rev. 2 9 of 9 februa ry 2007 www.diodes.com ? diodes incorporated important notice life support diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to any product herein. diodes incorporated does not assume any liability arising out of the application or use of any pr oduct described herein; neither does it convey any license under its patent rights, nor the rights of others. the user of products in such applications shall a ssume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on our website, harmless against all dam ages. diodes incorporated products are not authorized for use as critical components in life support devices or systems without the e xpressed written approval of the president of diodes incorporated.
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