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Technical content
Features
Precision Monitoring Voltage of +2.2V and +3.7V Fully Specified Over Temperature Available in Three Output Configurations Push-Pull RESET Output (G656L) Push-Pull RESET Output (G656H) Open-Drain RESET Output (G657L) Reset Deassert Time Smaller than 100µs when VCC Higher than Monitor Voltages (CD Pin Float- ing) Externally Programmable Time Delay Generator 27µA Supply Current at VCC=3.3V Guaranteed Reset Valid to VCC = 0.8V TSOT-23-5 Packages 2% Threshold Accuracy
Applications
Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable / Battery-Powered Equipment Automotive General Description The G656/G657 are microprocessor ( µP) supervisory circuits used to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost. These circuits perform a single function: they assert a reset signal whenever the V CC supply voltage declines below a preset threshold, with hysteresis keeping it asserted for time delay determined by externally pro- grammable time delay generator after V CC has risen above the reset threshold. The G657L has an open-drain output stage, while the G656 have push-pull outputs. The G657L ’s open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than V CC. The G656L has an active-low RESET output, while the G656H has an active-high RESET output. The outputs are guaranteed to be in the correct logic state for V CC down to 0.8V. The G656/G657 are available in 5-pin TSOT-23-5 package. 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 TSOT-23-5 RESET (RESET) VCC NC43GND CD ()is for G656H *G657 only RESET INPUT GND µP VCC RESET (RESET) GND G656/G657 VCC CD VCC CD Rpull-up* G656/G657 ICC may increased at high TA, Therefore, can not connect Resistors to VCC to prevent Icc abnormal behavior at high T A. TSOT-23-5 RESET (RESET) VCC NC43GND CD ()is for G656H *G657 only RESET INPUT GND µP VCC RESET (RESET) GND G656/G657 VCC CD VCC CD Rpull-up* G656/G657 ICC may increased at high TA, Therefore, can not connect Resistors to VCC to prevent Icc abnormal behavior at high T A.