Global Mixed-mode Technology Inc.
G670/G671
Microprocessor Reset IC
Features
Precision Monitoring of +3V, +3.3V, and +5V
Power-Supply Voltages
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.
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 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 avail-
able in 3-pin SOT-23, TO-92 and SOT-89 packages.
Pin Configuration
Typical Application
V
CC
3
VCC
VCC
R
PULL-UP
*
Top View
Top 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)
G670LxxxT2xUf
G670HxxxT2xUf
G671LxxxT2xUf
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 T7
X
Pin Option
Package Type
Threshold Voltage Option
Part Number
PART NUMBER
G670L : Push-Pull Active Low Output
G670H : Push-Pull Active High Output
G671L : Open-Drain Output
THRESHOLD VOLTAGE OPTION
* xxx specifies the threshold voltage.
e.g. 263 denotes the 2.64V threshold voltage.
PACKAGE TYPE
TD : TO-92
T2 : SOT-89
T7 : SOT-23
PIN OPTION
1
1 :
RESET
2 :
RESET
3 : GND
4 : GND
5 : V
CC
6 : V
CC
*RESET for G670H
2
GND
V
CC
RESET
3
V
CC
GND
V
CC
RESET
RESET
V
CC
GND
RESET
GND
Ver: 1.5
Dec 03, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
2
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