GMT G670 Microprocessor reset ic Datasheet

G670/G671
Global Mixed-mode Technology
Microprocessor Reset IC
Features
General Description
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Precision Monitoring of +3V, +3.3V, and +5V
Power-Supply Voltages
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Fully Specified Over Temperature
Available in Three Output Configurations
Push-Pull RESET Output (G670L)
Push-Pull RESET Output (G670H)
Open-Drain RESET Output (G671L)
2ms max Power-On Reset Pulse Width
14µA Supply Current
Guaranteed Reset Valid to VCC = +1V
Power Supply Transient Immunity
No External Components
3-Pin SOT-23,TO-92, SC-70-3(SOT-323) and
SOT-89 Packages
2% Reset Threshold Accuracy with 5% Hysteresis
The G670/G671 are microprocessor (µP) supervisory
circuits used to monitor the power supplies in µP and
digital systems. They provide excellent circuit reliability
and low cost by eliminating external components and
adjustments when used with +5V, +3.3V, +3.0V- powered circuits.
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These circuits perform a single function: they assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold. Reset thresholds suitable for
operation with a variety of supply voltages are available.
The G671L has an open-drain output stage, while the
G670 have push-pull outputs. The G671L’s open-drain
RESET output requires a pull-up resistor that can be
connected to a voltage higher than VCC. The G670L
have an active-low RESET output, while the G670H
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 1V.
Applications
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Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable / Battery-Powered Equipment
Automotive
Low supply current makes the G670/G671 ideal for
use in portable equipment. The G670/G671 are available in 3-pin SOT-23, TO-92, SC-70-3(SOT-323) and
SOT-89 packages.
Pin Configuration
Typical Application Circuit
VCC
3
VCC
0.1µF
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RPULL-UP*
G670/G671
RESET
(RESET)
1
2
SOT-23/
SC-70-3 (SOT-323)
1
2
SOT-89
3
GND
1
2
VCC
µP
RESET
INPUT
GND
3
TO-92
*G671 only
ICC may increased at high TA, Therefore, can not connect
Resistors to VCC to prevent Icc abnormal behavior at high TA.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 2.1
Apr 10, 2012
1
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