G681

` High ±2% Voltage Threshold Accuracy
` Independently Adjustable High- and Low- Voltage Thresholds
` Fully Specified Over Temperature
` Available in Three Output Configurations
  Push-Pull RESET Output (G680L)
  Push-Pull RESET Output (G680H)
  Open-Drain RESET Output (G681L)
` 140ms min Power-On Reset Pulse Width
` 4A Supply Current
` Power Supply Transient Immunity
` 5-Pin SOT23-5 Packages

Terminal Voltage (with respect to GND)
V_CC.........................-0.3V to +6.0V
Input Voltage (V_LTH, V_HTH)......-0.3V to (V_CC + 0.3V)
RESET,RESET (push-pull)..........-0.3V to (V_CC + 0.3V)
RESET (open drain).................-0.3V to +6.0V
Input Current, V_CC .....................................20mA
Output Current, RESET, RESET ..............20mA
Continuous Power Dissipation (T_A = +70)
SOT23-5.........................568mW
Operating Temperature Range ......-40 to +105
Storage Temperature Range.........-65 to +150
Lead Temperature (soldering, 10s) .........+300

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings nly, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of he specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The G680/G681 are microprocessor (P) supervisory circuits used to monitor the power supplies in P and digital systems. High- and Low- voltage thresholds can be adjusted independently, allowing for wide hysteresis.

Voltage detection thresholds are accurate to 2%.

These circuits of G680/G681 perform a single function: they assert a reset signal whenever the VCC supply voltage declines below the low-voltage threshold, keeping it asserted for at least 140ms after VCC has risen above the high-voltage threshold.

The G681L has an open-drain output stage, while the G680 have push-pull outputs. The G681L's open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than VCC. The G680L have an active-low RESET output, while the G680H has an active-high RESET output. The reset comparator is designed to ignore fast transients on threshold input.

The IC's power supply is separate from the detector inputs, allowing the G680/G681 to be powered from a down-stream supply. Low supply current (4A, typical) makes the G680/G681 ideal for use in portable equipment. The G680/G681 are available in 5 pin SOT 23-5 packages.