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G680 Datasheet, PDF (1/7 Pages) List of Unclassifed Manufacturers – Microprocessor Reset IC | |||
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Global Mixed-mode Technology Inc.
G680/G681
Microprocessor Reset IC
Features
ÂHigh ±2% Voltage Threshold Accuracy
ÂIndependently Adjustable High- and Low-
Voltage Thresholds
ÂFully Specified Over Temperature
ÂAvailable in Three Output Configurations
Push-Pull RESET Output (G680L)
Push-Pull RESET Output (G680H)
Open-Drain RESET Output (G681L)
Â140ms min Power-On Reset Pulse Width
Â4µA Supply Current
ÂPower Supply Transient Immunity
Â5-Pin SOT23-5 Packages
Applications
ÂComputers
ÂControllers
ÂIntelligent Instruments
ÂCritical µP and µC Power Monitoring
ÂPortable / Battery-Powered Equipment
ÂAutomotive
General Description
The G680/G681 are microprocessor (µP) supervisory
circuits used to monitor the power supplies in µP and
digital systems. High- and Low- voltage thresholds can
be adjusted independently, allowing for wide hystere-
sis. Voltage detection thresholds are accurate to 2%.
These circuits 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 G681Lâs 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 com-
parator is designed to ignore fast transients on thresh-
old input.
The ICâs power supply is separate from the detector
inputs, allowing the G680/G681 to be powered from a
down-stream supply. Low supply current (4µA, typical)
makes the G680/G681 ideal for use in portable
equipment. The G680/G681 are available in 5 pin SOT
23-5 packages.
Ordering Information
PART
G680H(L)T1
G681LT1
TEMP. RANGE
-40°C ~ +105°C
-40°C ~ +105°C
PIN-PACKAGE
SOT23-5
SOT23-5
Pin Configuration
Typical Operating Circuit
HTH 1
5 Vcc
GND 2 G680/G681
LTH 3
4 RESET(RESET)
SOT23-5
() is for G680H
VCC
VCC
HTH
G680/G681
LTH RESET
(RESET)
GND
VCC
* RPULL-UP
µP
RESET
INPUT
GND
*G681 ONLY
Ver: 03 Preliminary
Jan 25 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
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