ver: 1.3 apr 10, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 1 G674/g675 global mixed-mode technology microprocessor reset ic features ? precision monitoring of +2.5v and +3v power-supply voltages ? fully specified over temperature ? available in three output configurations push-pull reset output (G674l) push-pull reset output (G674h) open-drain reset output (g675l) ? externally programmable time delay generator ? 14 a supply current ? guaranteed reset valid to v cc = 0.8v ? power supply transient immunity ? 5 pin sot-23-5 and 6 pin tdfn2x2 packages ? 2% threshold accuracy applications ? computers ? controllers ? intelligent instruments ? critical p and c power monitoring ? portable / battery-powered equipment ? automotive general description the G674/g675 are microprocessor ( p) supervisory circuits used to monitor the power supplies in p and digital systems. they provi de excellent circuit reliability and low cost and adjustments when used with +2.5v, +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, with hyst eresis keeping it asserted for time delay determined by externally programmable time delay generator after v cc has risen above the reset thresh- old. reset thresholds suitable for operation with a variety of supply voltages are available. the g675l has an open-drain output stage, while the G674 have push-pull outputs. the g675l ? s open-drain reset output requires a pull-up resistor that can be connected to a voltage higher than v cc . the G674l have an active-low reset output, while the G674h has an active-high reset output. the reset comparator is de- signed to ignore fast transients on v cc , and the outputs are guaranteed to be in the co rrect logic state for v cc down to 0.8v. low supply current makes the G674/g675 ideal for use in portable equipment. the G674 /g675 are available in 5-pin sot-23-5 and 6 pin tdfn2x2 packages. ordering information order number temp. range package (green) G674hxxxt1u -40 c ~ +105 c sot-23-5 G674lxxxt1u -40 c ~ +105 c sot-23-5 g675lxxxt1u -40 c ~ +105 c sot-23-5 G674hxxxrb1u -40 c ~ +105 c tdfn2x2-6 G674lxxxrb1u -40 c ~ +105 c tdfn2x2-6 g675lxxxrb1u -40 c ~ +105 c tdfn2x2-6 * xxx specifies the threshold voltage. e.g. 240 denotes the 2.4v threshold voltage. pin configuration typical application circuit reset(reset) vcc sot-23-5 G674/g675 5 1 2 n.c. 4 3 gnd cd ()is for G674h *g675 only reset input gnd p vcc reset (reset) gnd G674/g675 vcc cd v cc c d r pull-up* tdfn2x2-6 G674/g675 gnd n.c. cd 1 2 3 6 5 4 thermal pad vcc n.c. note: recommend connecting the thermal pad to the ground for excellent power dissipation. reset(reset) icc may increased at high t a , therefore, can not connect resistors to vcc to prevent icc abnormal behavior at high t a . reset(reset) vcc sot-23-5 G674/g675 5 1 2 n.c. 4 3 gnd cd reset(reset) vcc sot-23-5 G674/g675 5 1 2 n.c. 4 3 gnd cd ()is for G674h *g675 only reset input gnd p vcc reset (reset) gnd G674/g675 vcc cd v cc c d r pull-up* tdfn2x2-6 G674/g675 gnd n.c. cd 1 2 3 6 5 4 thermal pad vcc n.c. note: recommend connecting the thermal pad to the ground for excellent power dissipation. reset(reset) 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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