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Global Mixed-mode Technology Inc.
G670/G671
Microprocessor Reset IC
Features
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- powered circuits. 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.
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 VCC = +1V Power Supply Transient Immunity No External Components 3-Pin SOT-23,TO-92 and SOT-89 Packages 2% Threshold Accuracy
Applications
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 and SOT-89 packages.
Pin Configuration
Typical Application Circuit
VCC 3 VCC VCC RPULL-UP*
Top TopView View
Top View
G670/G671
RESET (RESET)
µP
RESET INPUT GND
1
2
1
2
3
GND 1 2 3
SOT-23
SOT-89
TO-92
*G671 only
Ver: 1.5 Dec 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Ordering Information
ORDER NUMBER
G670LxxxTDxB G670HxxxTDxB G671LxxxTDxB G670LxxxT2xU G670HxxxT2xU G671LxxxT2xU G670LxxxT7xU G670HxxxT7xU G671LxxxT7xU
G670/G671
OUTPUT TYPE
Push-Pull Active Low Push-Pull Active High Open-Drain Push-Pull Active Low Push-Pull Active High Open-Drain Push-Pull Active Low Push-Pull Active High Open-Drain
ORDER NUMBER (Pb free)
G670LxxxTDxBf G670HxxxTDxBf G671LxxxTDxBf G670LxxxT2xUf G670HxxxT2xUf G671LxxxT2xUf G670LxxxT7xUf G670HxxxT7xUf G671LxxxT7xUf
TEMP. RANGE
-40°C ~ +105°C -40°C ~ +105°C -40°C ~ +105°C -40°C ~ +105°C -40°C ~ +105°C -40°C ~ +105°C -40°C ~ +105°C -40°C ~ +105°C -40°C ~ +105°C
Note: U : Tape & Reel B: Bag
Order Number Identification
G67XX XXX XX X Pin Option Package Type Threshold Voltage Option Part Number
PART NUMBER
G670L : Push-Pull Active Low Output G670H : Push-Pull Active High Output .