G670_15 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Microprocessor Reset IC

Global Mixed-mode Technology
G670/G671
Microprocessor Reset IC
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 (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 V_CC = +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% Hys-
teresis
Applications
„ Computers
„ Controllers
„ Intelligent Instruments
„ Critical µP and µC Power Monitoring
„ Portable / Battery-Powered Equipment
„ Automotive
General Description
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- pow-
ered circuits.
These circuits perform a single function: they assert a
reset signal whenever the V_CC supply voltage declines
below a preset threshold. Reset thresholds suitable for
operation with a variety of supply voltages are avail-
able.
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 V_CC. The G670L
have an active-low RESET output, while the G670H
has an active-high RESET output. The reset com-
parator is designed to ignore fast transients on V_CC,
and the outputs are guaranteed to be in the correct
logic state for V_CC down to 1V.
Low supply current makes the G670/G671 ideal for
use in portable equipment. The G670/G671 are avail-
able in 3-pin SOT-23, TO-92, SC-70-3(SOT-323) and
SOT-89 packages.
Pin Configuration
3
TTooppVVieieww
1
2
SOT-23/
SC-70-3 (SOT-323)
12 3
SOT-89
Top
View
123
TO-92
Typical Application Circuit
V_CC
0.1µF
VCC
G670/G671
RESET
(RESET)
GND
VCC
* R_PULL-UP
µP
RESET
INPUT
GND
*G671 only
ICC may increased at high TA, Therefore, can not connect
Resistors to VCC to prevent Icc abnormal behavior at high TA.
Ver: 2.1
Apr 10, 2012
TEL: [phone]
http://www.gmt.com.tw
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