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Technical content
Features
Precision Monitoring of +3V, +3.3V, and +5V Power-Supply Voltages Fully Specified Over Temperature Available in Two Output Configurations Push-Pull RESET Output (G676L) Open-Drain RESET Output (G677L) Adjustable Reset Delay Time Manual Reset Input with Adjustable Manual Re set Deglitch Time 14µA Supply Current Guaranteed Reset Valid to VCC = 1V Power Supply Transient Immunity 6 pin SOT-23-6 and ADFN1.5X1.5-6 Packages 2% Threshold Accuracy
Applications
Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable / Battery-Powered Equipment Automotive General Description The G676/G677 are microprocessor ( µP) supervisory circuits used to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost 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 or manual reset is triggered, and keeping it asserted for time delay determined by adjustable time delay generator (CD pin) after VCC has risen above the reset threshold or manual reset is released. Reset thresholds suitable for operation with a variety of supply voltages are available. Manual re- set is generated after pull low MR pin lastingly over deglitch time delay set by capacitor connected in MRDLY pin. The G677L has an open-drain output stage, while the G676 have push-pull outputs. The G677L ’s open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than VCC. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the cor- rect logic state for VCC down to 1V. Low supply current makes the G676/G677 ideal for use in portable equipment. The G676/G677 are avail- able in 6-pin SOT-23-6 and ADFN1.5X1.5-6 packages.
Ordering Information
ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G676LxxxTBU 676xx -40 °C ~ +105°C SOT-23-6 G677LxxxTBU 677xx -40 °C ~ +105°C SOT-23-6 G676LxxxA31U 66 xx -40°C ~ +105°C ADFN1.5X1.5-6 G677LxxxA31U 67 xx -40°C ~ +105°C ADFN1.5X1.5-6 * xxx specifies the threshold voltage. e.g. 263 denotes the 2.64V threshold voltage. TB: SOT-23-6 A3:ADFN1.5X1.5-6 1 : Bonding Code U: Tape & Reel P i n C o n f i g u r a t i o n T y p i c a l A p p l i c a t i o n C i r c u i t *G677 ONLY RESET INPUT GND µP VCC RESET GND G676/G677 VCC CD VCC CD Rpull-up* CMR MR MRDLY RESETGND SOT-23-6 VCC43MRDLY CD MR G676/G677 ADFN1.5X1.5-6 G676/G677 MRDLY GND CD MR RESET VCC ICC may increased at high TA, Therefore, can not connect Resistors to VCC to prevent Icc abnormal behavior at high T A. *G677 ONLY RESET INPUT GND µP VCC RESET GND G676/G677 VCC CD VCC CD Rpull-up* CMR MR MRDLY RESETGND SOT-23-6 VCC43MRDLY CD MR G676/G677 ADFN1.5X1.5-6 G676/G677 MRDLY GND CD MR RESET VCC ICC may increased at high TA, Therefore, can not connect Resistors to VCC to prevent Icc abnormal behavior at high T A.