ap1701/2/3/4 3-pin microprocessor reset circuits ap1701/2/3/4 rev. 3 1 of 10 august 2009 www.diodes.com ? diodes incorporated not recommended for ne w design, use (apx809/810) ? 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 ? sc59: available in ?green? molding compound (no br, sb) ? lead free finish/ rohs compliant (note 1) 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 supply 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 typical applicat ion circuit ap170x gnd reset (reset) v cc microprocessor v cc gnd reset input v cc cin 0.1uf features general description applications
ap1701/2/3/4 3-pin microprocessor reset circuits ap1701/2/3/4 rev. 3 2 of 10 august 2009 www.diodes.com ? diodes incorporated not recommended for ne w design, use (apx809/810) lead-free ap 170 x x w x - 7 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 : tape & reel enable lead free l : lead free g : green 4 : active-high 3 : active-low 2 : active-high 1 : active-low device package code packaging (note 2) 7? tape and reel quantity part number suffix ap170xwl-7 w sc59 3000/tape & reel -7 ap170xwg-7 w sc59 3000/tape & reel -7 notes: 1. eu directive 2002/95/ec (rohs). all applicable rohs exemptions applied. please visit our website at http://www.diodes.com/products/lead_free.html 2. pad layout as shown on diodes inc. suggested pad layout document ap02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. ( top view ) 1 2 gnd vcc ap1701 ap1702 2 3 (reset) reset sc59 ( top view ) 1 2 gnd vcc ap1703 ap1704 2 3 (reset) reset sc59 ordering information pin assignments
ap1701/2/3/4 3-pin microprocessor reset circuits ap1701/2/3/4 rev. 3 3 of 10 august 2009 www.diodes.com ? diodes incorporated not recommended for ne w design, use (apx809/810) block diagram v ref delay circuit driver reset / reset absolute maxi mum 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 descriptions pin 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 microprocessor reset circuits ap1701/2/3/4 rev. 3 4 of 10 august 2009 www.diodes.com ? diodes incorporated not recommended for ne w design, use (apx809/810) 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 v th reset threshold t a = 25oc ap1701/2/3/4a 4.54 4.63 4.72 v 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 ap1701/2/3/4g 2.20 2.25 2.30 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 ol trese output voltage low v cc = v th min, i sink = 1.2ma, ap1701/3 0.3 v v cc = v th min, i sink = 3.2ma 0.4 v cc > 1.0v, i sink = 50ua 0.3 v oh trese output voltage-high v cc > v th max, i source = 500ua, ap1701/3 0.8v cc v v cc > v th max, i source = 800ua v cc ?1.5 v ol reset output voltage-low v cc = v th max, i sink = 1.2ma, ap1702/4 0.3 v v cc = v th max, i sink = 3.2ma 0.4 v oh reset output voltage-high 1.8v < v cc < v th min, i source = 150ua, ap1702/4 0.8 v cc v
ap1701/2/3/4 3-pin microprocessor reset circuits ap1701/2/3/4 rev. 3 5 of 10 august 2009 www.diodes.com ? diodes incorporated not recommended for ne w design, use (apx809/810) functional 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 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 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 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. reset
ap1701/2/3/4 3-pin microprocessor reset circuits ap1701/2/3/4 rev. 3 6 of 10 august 2009 www.diodes.com ? diodes incorporated not recommended for ne w design, use (apx809/810) 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 microprocessor reset circuits ap1701/2/3/4 rev. 3 7 of 10 august 2009 www.diodes.com ? diodes incorporated not recommended for ne w design, use (apx809/810) 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 lo w active high t delay t delay t delay v th
ap1701/2/3/4 3-pin microprocessor reset circuits ap1701/2/3/4 rev. 3 8 of 10 august 2009 www.diodes.com ? diodes incorporated not recommended for ne w design, use (apx809/810) marking information (1) sc59 1 2 3 xx y w x ( top view ) xx : identification code w : week : a~z : 1~26 week; x : a~z : green y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week a~z : lead free 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 microprocessor reset circuits ap1701/2/3/4 rev. 3 9 of 10 august 2009 www.diodes.com ? diodes incorporated not recommended for ne w design, use (apx809/810) package information (all dimensions in mm) (1) package type: sc59 0 . 3 5 /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 o /8 o
ap1701/2/3/4 3-pin microprocessor reset circuits ap1701/2/3/4 rev. 3 10 of 10 august 2009 www.diodes.com ? diodes incorporated not recommended for ne w design, use (apx809/810) important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life support devices or systems. copyright ? 2009, diodes incorporated www.diodes.com
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