ver: 2.1 apr 10, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 1 g670/g671 global mixed-mode technology microprocessor reset ic features ? precision monitoring of +3v, +3.3v, and +5v power-supply voltages ? fully specified over temperature ? available in three output configurations push-pull reset output (g670l) push-pull reset output (g670h) open-drain reset output (g671l) ? 2ms max power-on reset pulse width ? 14a supply current ? guaranteed reset valid to v cc = +1v ? power supply transient immunity ? no external components ? 3-pin sot-23,to-92, sc-70-3(sot-323) and sot-89 packages ? 2% reset threshold accuracy with 5% hys- teresis applications ? computers ? controllers ? intelligent instruments ? critical p and c power monitoring ? portable / battery-powered equipment ? automotive general description the g670/g671 are microprocessor ( p) supervisory circuits used 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- pow- ered circuits. these circuits perform a single function: they assert a reset signal whenever the v cc supply voltage declines below a preset threshold. reset thresholds suitable for operation with a variety of supply voltages are avail- able. the g671l has an open-drain output stage, while the g670 have push-pull outputs. the g671l?s open-drain reset output requires a pull-up resistor that can be connected to a voltage higher than v cc . the g670l have an active-low reset output, while the g670h has an active-high reset output. the reset com- parator 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 g670/g671 ideal for use in portable equipment. the g670/g671 are avail- able in 3-pin sot-23, to-92, sc-70-3(sot-323) and sot-89 packages. pin configuration typical application circuit sot-23/ sc-70-3 (sot-323) reset input gnd p vcc reset (reset) gnd g670/g671 vcc r pull-up v cc * *g671 only 1 2 3 top view 1 2 3 top view 1 2 3 sot-89 to-92 13 2 top view 0.1f icc may increased at high t a , therefore, can not connect resistors to vcc to prevent icc abnormal behavior at high t a . sot-23/ sc-70-3 (sot-323) reset input gnd p vcc reset (reset) gnd g670/g671 vcc r pull-up v cc * *g671 only 1 2 3 top view top view 1 2 3 top view 1 2 3 sot-89 to-92 13 2 top view 0.1f icc may increased at high t a , therefore, can not connect resistors to vcc to prevent icc abnormal behavior at high t a .
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