View AX6904_7810766.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1/8 axelite confidential materials, do not copy or distribute with out written consent. rev.0.1 nov.30, 2006 a x6901/2/3/4 ( preliminar y) 3-pin microprocessor reset circuits ? general description theax6901/2/3/4 are used for microprocessor ( p) supervisory circuits to monitor the power supplies in p and digital systems. they provide excellent ci rcuit 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: t hey 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 threshol d. reset thresholds suitable for operation with a variety of supply voltages are ava ilable. theax6901/2/3/4 have push pull outputs. theax6901/3 have an active low reset output , while theax6902/4 has an active high reset output. the reset comparator is desi gned to ignore fast transients on vcc, and the outputs are guaranteed to be in the correct logic state for vcc down to 1v. low supply current makes theax6901/2/3/4 i deal for use in portable equipment. theax6901/2/3/4 is available in a 3-pin sot23 package. . ? features - precision monitoring of +2.5,+3v, +3.3v, and +5v power-supply voltages - fully specified over temperature - available in three ou tput configurations - push-pull reset low output(ax6901/3) - push-pull reset high output(ax6902/4 - 200ms (typ.)min power-on reset pulse width - 25a supply current - guaranteed reset valid to vcc = +1v - power supply transient immunity - no external components - available in the 3-pi n pb-free sot23 package free datasheet http://www..net/
2/8 axelite confidential materials, do not copy or distribute with out written consent. rev.0.1 nov.30, 2006 a x6901/2/3/4 ( preliminar y) ? block diagram vref delay circuit reset / reset gnd vcc + - p-mos n-mos ? pin assignment the packages of ax6901/2/3/4 is sot23; the pin assignment is given by: name description gnd ground reset (reset) reset output pin l: forax6901/3 h: forax6902/4 v cc operating voltage input (top view) 1 2 gnd v cc sot23 ax6901 ax6902 2 3 (top view) 1 2 gnd v cc sot23 ax6903 AX6904 2 3 (reset) reset (reset) reset free datasheet http://www..net/
3/8 axelite confidential materials, do not copy or distribute with out written consent. rev.0.1 nov.30, 2006 a x6901/2/3/4 ( preliminar y) ? order/marking information order information top marking ax690x x x x enable 1: active-low 2: active-high voltage a: 4.63 b: 4.38 c: 4.00 d: 3.08 e: 2.93 f: 2.63 g: 2.25 3: active-low 4: active-high package b:sot23 a : taping packing xxyw part number code ww : 01~26(a~z) 27~52(a~z) year : 7 = 2007 a = 2010 appendix part number identification code part number identification code ax6901a ca ax6903a co ax6901b cb ax6903b cp ax6901c cc ax6903c cq ax6901d cd ax6903d cr ax6901e ce ax6903e cs ax6901f cf ax6903f ct ax6901g cg ax6903g cu ax6902a ch AX6904a c1 ax6902b ci AX6904b c2 ax6902c cj AX6904c c3 ax6902d ck AX6904d c4 ax6902e cl AX6904e c5 ax6902f cm AX6904f c6 ax6902g cn AX6904g c7 free datasheet http://www..net/
4/8 axelite confidential materials, do not copy or distribute with out written consent. rev.0.1 nov.30, 2006 a x6901/2/3/4 ( preliminar y) ? absolute maximum ratings (at t a =25
) characteristics symbol rating unit vcc pin voltage v cc gnd - 0.3 to gnd + 6.5 v reset, reset (push-pull) pin voltage v reset gnd - 0.3 to v cc + 0.3 v input current, v cc i cc 20 ma output current, reset, reset i o 5 ma operating supply voltage v op +1.0 to +6.0 v power dissipation pd ( t j -t a ) / ja mw storage temperature range t st -40 to +150
operating temperature range t op -20 to +85
junction temperature t j -20 to +125
thermal resistance from junction to case jc 110
/w thermal resistance from junction to ambient ja 250
/w note1 : ja is measured with the pcb copper area of approximately 1 in 2 (multi-layer). that need connect to v ss pin. ? electrical characteristics ta=25
(unless otherwise noted) characteristics symbol conditions min typ max units supply current i cc v cc = v th +1.0v - 35 50 a ap1701/2/3/4a 4.54 4.63 4.71 ap1701/2/3/4b 4.29 4.38 4.46 ap1701/2/3/4c 3.92 4.00 4.08 ap1701/2/3/4d 3.02 3.08 3.15 ap1701/2/3/4e 2.87 2.93 3.00 ap1701/2/3/4f 2.57 2.63 2.69 reset threshold t a =25oc v th ap1701/2/3/4g 2.20 2.25 2.30 v reset threshold tempco v tht guaranteed by design - 50 ppm/ o c set-up time t s v cc = 0 to (v th ? 100mv) 1 - - s reset active timeout period t delay t a = 0 o c to +70 o c 140 200 260 ms v ol v cc = v th min, i sink = 1.2ma,ax6901/3 - - 0.3 v cc = v th min, i sink = 3.2ma - - 0.4 t rese output voltage low v cc > 1.0v, i sink = 50ua - - 0.3 v v oh v cc > v th max, i source = 500ua,ax6901/3 0.8v cc - - t rese output voltage high v cc > v th max, i source = 800ua v cc ?1.5 - v v ol v cc = v th max, i sink = 1.2ma,ax6902/4 - - 0.3 reset output voltage low v cc = v th max, i sink = 3.2ma - - 0.4 v reset output voltage high v oh 1.8v < v cc < v th min, i source = 150ua,ax6902/4 0.8 v cc - - v hysteresis at v cc v hys input voltage - 40 - mv output short-circuit t rese i os - - -500 a free datasheet http://www..net/
5/8 axelite confidential materials, do not copy or distribute with out written consent. rev.0.1 nov.30, 2006 a x6901/2/3/4 ( preliminar y) ? application circuit ax690x gnd reset (reset) vcc microprocessor vcc gnd reset input vcc ? function descriptions a microprocessor?s (p?s) reset input starts the p in a known state. theax6901/2/3/4 assert reset to prevent code-execution errors during power-up, power-down, or brownout conditions. they assert a reset signal whenever the vcc supply voltage declines below a preset thres hold, keeping it asserted for at least 200ms after vcc has risen above the reset thres hold. theax6901/2/3/4 have a push-pull output stage. ? application information negative-going vcc transients in addition to issuing a reset to the p during power-up, power-down, and brownout conditions, the ax6901/2/3/4 are relatively immune to short-dur ation negative-going vcc transients (glitches). the ax6901/2/3/4 do 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 ov erdrive). the graph indicates the maximum pulse width a negativ e 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 th reshold a 0.1f bypass capacitor mounted as close as possible to the vcc pin provides additional transient immunity. ensuring a valid reset output down to vcc = 0 reset is guaranteed to be a logic low for vcc > 1v. 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 free datasheet http://www..net/
6/8 axelite confidential materials, do not copy or distribute with out written consent. rev.0.1 nov.30, 2006 a x6901/2/3/4 ( preliminar y) timer resets to zero, and reset goes low. the internal time r starts after vcc returns above the reset threshold, and reset remains low for the reset timeout period. when vcc falls below 1v, theax6901/3 re set 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 applicati ons since most p and other circuitry is inoperative with vcc 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 crit ical; 100k is large enough not to load reset and small enough to pull reset to ground. for theax6902/4 if reset is required to remain valid for vcc < 1v. benefits of highly accurate reset threshold most p supervisor ics have reset thres hold voltages between 5% and 10% below the value of nominal sup-ply 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 l eaves a zone of uncertainty where the supply is between 5% and 10% low, and where t he reset may or may not be asserted. ? typical characteristics threshold v.s. temp (v th =2.93v ) -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 free datasheet http://www..net/
7/8 axelite confidential materials, do not copy or distribute with out written consent. rev.0.1 nov.30, 2006 a x6901/2/3/4 ( preliminar y) ? timing diagram t delay v cc v th active low active high t delay t delay t delay (jmudi*nnvojuz 3&4&5$0.1"3"50307&3%3*7& n7
.byjnvn5sbotjfou %vsbujpo vt
free datasheet http://www..net/
8/8 axelite confidential materials, do not copy or distribute with out written consent. rev.0.1 nov.30, 2006 a x6901/2/3/4 ( preliminar y) ? package outlines l e e he d a2 a1 b(3x) a view c l1 1(4x) 2(4x) e1 gauge plane c see view c dimensions in millimeters dimensions in inches symbol min. nom. min. nom. a 1.05 - a 1.05 - a a1 0.05 - a1 0.05 - a1 a2 1.00 1.10 a2 1.00 1.10 a2 b 0.25 - b 0.25 - b c 0.08 - c 0.08 - c d 2.70 2.90 d 2.70 2.90 d e 1.50 1.60 e 1.50 1.60 e he 2.60 2.80 he 2.60 2.80 he l 0.30 - l 0.30 - l l1 0.50 0.60 l1 0.50 0.60 l1 e 1.80 1.90 e 1.80 1.90 e e1 0.85 0.95 e1 0.85 0.95 e1 0 o 5 o 0 o 5 o 1 3 o 5 o 1 3 o 5 o 1 2 6 o 8 o 2 6 o 8 o 2 free datasheet http://www..net/

▲Up To Search▲

Price & Availability of AX6904

	To Download AX6904 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .