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Part Number: G685
Description: The G684/G685 are microprocessor (µP) supervisory circuits used to monitor the power supplies in...
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G685
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General Description
G685 General Description
The G684/G685 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 VCC supply voltage declines below a preset threshold, with hysteresis after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available.
The G685 has an open-drain output stage, while the G684 have push-pull outputs. The G685L's open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than VCC. The G684L have an active-low RESET output, while the G684H has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 0.8V. Low supply current makes the G684/G685 ideal for use in portable equipment. The G684/G685 are available in 5-pin SOT23-5 packages.
G685 Maximum Ratings
Terminal Voltage (with respect to GND)
VCC......................................-0.3V to +6.0V
Delay Capacitor Pin Voltage, VCD.............-0.3 to (VCC +0.3V)
RESET,RESET (push-pull).......................-0.3V to (VCC + 0.3V)
RESET (open drain)........................................-0.3V to +6.0V
Input Current, VCC ......................................................20mA
Output Current, RESET, RESET ......................................20mA
Continuous Power Dissipation (TA = +70)
5-Pin SOT23-5 (derate 2.17mW/ above +70)..........174mW
Operating Temperature Range ....................-40 to +105
Storage Temperature Range........................-65 to +150
Lead Temperature (soldering, 10s).........................+260
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
VCC......................................-0.3V to +6.0V
Delay Capacitor Pin Voltage, VCD.............-0.3 to (VCC +0.3V)
RESET,RESET (push-pull).......................-0.3V to (VCC + 0.3V)
RESET (open drain)........................................-0.3V to +6.0V
Input Current, VCC ......................................................20mA
Output Current, RESET, RESET ......................................20mA
Continuous Power Dissipation (TA = +70)
5-Pin SOT23-5 (derate 2.17mW/ above +70)..........174mW
Operating Temperature Range ....................-40 to +105
Storage Temperature Range........................-65 to +150
Lead Temperature (soldering, 10s).........................+260
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
G685 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 (G684L)
Push-Pull RESET Output (G684H)
Open-Drain RESET Output (G685L)
· 14µA Supply Current
· Guaranteed Reset Valid to VCC = 0.8V
· Power Supply Transient Immunity
· 5 pin SOT23-5 Packages
· 2% Threshold Accuracy
· Fully Specified Over Temperature
· Available in Three Output Configurations
Push-Pull RESET Output (G684L)
Push-Pull RESET Output (G684H)
Open-Drain RESET Output (G685L)
· 14µA Supply Current
· Guaranteed Reset Valid to VCC = 0.8V
· Power Supply Transient Immunity
· 5 pin SOT23-5 Packages
· 2% Threshold Accuracy
G685 Typical Application
· Computers
· Controllers
· Intelligent Instruments
· Critical µP and µC Power Monitoring
· Portable / Battery-Powered Equipment
· Automotive
· Controllers
· Intelligent Instruments
· Critical µP and µC Power Monitoring
· Portable / Battery-Powered Equipment
· Automotive
G685 Connection Diagram
G6854-01
PDF/DataSheet Download
- Datasheet: G6854-01
- File Size: 179690 KB
- Manufacturer: HAMAMATSU [Hamamatsu Corporation]
- Click here to Download
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