unisonic technologies co., ltd utc812 cmos ic www.unisonic.com.tw 1 of 5 copyright ? 2010 unisonic technologies co., ltd ver.a microprocessor reset ic ? description the utc utc812 is a microprocessor (p) reset circuit designed to monitor the power supplies in p and digital systems. the utc utc812 has push-pull output and active-low reset output. this device provides customers with perfect system reliability and low cost which are achieved by to no external component requirement and adjustments when used with +5v, +3.3v, +3.0v- powered circuits. this circuit performs a single function: it asserts a reset signal whenever the v cc supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after v cc has risen above the reset threshold. reset th resholds suitable for operation with a variety of supply voltages are available. the reset comparator can be used to ignore fast transients on v cc , and outputs are guaranteed to be in the correct logic state for v cc down to 1v. in applications , the utc812 is suitable for computers, controllers, intelligent instruments, critical microprocessors, microcomputer power monitoring, portable, or battery-powered equipments and automotive device. ? features * supply current: 10a * precision monitoring of +5v, +3.3v, +3.0v powered circuits * with the two configurations in the following: push-pull reset output * power-on reset pulse width: 140ms (min.) * outputs guaranteed to be in the correct logic state for v cc down to 1v. * required no external components * power supply transient immunity ? ordering information ordering number package packing UTC812G-X-AE2-R sot-23-3 tape reel utc812g -x -ae2 -r (1)packing type (2)package type (1) r: tape reel (2) ae2: sot-23-3 (4) g: halogen free (3)output voltage code (4)halogen free (3) refer to marking information
utc812 cmos ic unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw ver.a ? marking information package voltage code marking sot-23-3 c : 3.08 v 812 g 3 21 voltage code ? pin configuration 3 1 2 reset v cc gnd ? pin description pin no. pin name description 1 gnd ic ground pin 2 123 reset reset goes low if vcc falls below the reset threshold and remains asserted for one reset timeout period after vcc exceeds the reset threshold. 3 v cc power supply input
utc812 cmos ic unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw ver.a ? block diagram delay circuit + - v ref gnd v cc reset
utc812 cmos ic unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw ver.a ? absolute maximum rating parameter symbol ratings unit terminal voltage (with respect to gnd) v cc -0.3~6.0 v reset, reset (push-pull) -0.3~(v cc +0.3) v input current v cc 20 ma output current, reset, reset 20 ma junction temperature t j 150 c operating temperature t opr -40~105 c storage temperature t stg -65~150 c notes: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? thermal data parameter symbol ratings unit junction to ambient ja 420 c/w ? electrical characteristics (note 1) (t a = 25 , v cc = 3.3v, unless otherwise specified.) parameter symbol test conditions min typ max unit v cc range 1.0 5.5 v supply current i cc v cc <3.6v 10 23 a reset threshold v th 3.03 3.08 3.12 v reset threshold tempco 40 ppm/c v cc to reset delay (note 2) v cc = v th to (v th ? 100mv) 7 s reset active timeout period v cc = v th max 150 550 ms reset output current high (push-pull active low) i oh v cc = 3.3v, v reset = 2.8v 3 ma notes: 1. production testing done at t a = +25c; limits over tem perature guaranteed by design
utc812 cmos ic unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw ver.a ? typical application circuit utc 812 v cc reset gnd v cc gnd reset input p v cc utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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