G680 Datasheet, PDF (1/1 Pages) List of Unclassifed Manufacturers – Microprocessor Reset IC

Global Mixed-mode Technology
G680/G681
Microprocessor Reset IC
Features
„ ±2.5% 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
„ 4µA Supply Current
„ Power Supply Transient Immunity
„ SOT-23-5 Packages
Applications
„ Computers
„ Controllers
„ Intelligent Instruments
„ Critical µP and µC Power Monitoring
„ Portable / Battery-Powered Equipment
„ Automotive
Ordering Information
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 V_CC supply voltage declines
below the low-voltage threshold, keeping it asserted
for at least 140ms after V_CC 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 V_CC. 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 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 (4µA, typical)
makes the G680/G681 ideal for use in portable
equipment. The G680/G681 are available in SOT
-23-5 packages.
ORDER NUMBER
(Pb free/Green)
G680LT1Uf
G680HT1Uf
G681LT1Uf
Note: T1: SOT-23-5
MARKING
680Ax
680Bx
681Ax
OUTPUT TYPE
Push-pull RESET
Push-pull RESET
Open-Drain RESET
TEMP.
RANGE
-40°C ~ +105°C
-40°C ~ +105°C
-40°C ~ +105°C
PACKAGE
SOT-23-5
SOT-23-5
SOT-23-5
Pin Configuration
Typical Application Circuit
HTH 1
G680/G681
5 Vcc
GND 2
LTH 3
SOT-23-5
4 RESET(RESET)
() is for G680H
Ver: 2.0
Nov 23, 2012
V_CC
V_CC
LTH
G680/G681
HTH ^RESET
(RESET)
GND
V_CC
* R_PULL-UP
µP
RESET
INPUT
GND
*G681 ONLY
TEL: [phone]
http://www.gmt.com.tw
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