Global Mixed-mode Technology
G674/G675
General Description
The G674/G675 are microprocessor (µP) supervisory
circuits used to monitor the power supplies in
µP
and
digital systems. They provide excellent circuit reliability
and low cost and adjustments when used with +2.5V,
+3.0V powered circuits.
These circuits perform a single function: they assert a reset
signal whenever the V
CC
supply voltage declines below a
preset threshold, with hysteresis keeping it asserted for
time delay determined by externally programmable time
delay generator after V
CC
has risen above the reset thresh-
old. Reset thresholds suitable for operation with a variety of
supply voltages are available.
The G675L has an open-drain output stage, while the
G674 have push-pull outputs. The G675L’s open-drain
Microprocessor Reset IC
Features
Precision Monitoring of +2.5V and +3V
Power-Supply Voltages
Fully Specified Over Temperature
Available in Three Output Configurations
Push-Pull
RESET Output (G674L)
Push-Pull RESET Output (G674H)
Open-Drain RESET Output (G675L)
Externally Programmable Time Delay Generator
14
µ
A Supply Current
Guaranteed Reset Valid to V
CC
= 0.8V
Power Supply Transient Immunity
5 pin SOT-23-5 and 6 pin TDFN2X2 Packages
2% Threshold Accuracy
Applications
Computers
Controllers
Intelligent Instruments
Critical
µ
P and
µ
C Power Monitoring
Portable / Battery-Powered Equipment
Automotive
RESET
output requires a pull-up resistor that can be
connected to a voltage higher than V
CC
. The G674L have
an active-low
RESET
output, while the G674H has an
active-high RESET output. The reset comparator is de-
signed to ignore fast transients on V
CC
, and the outputs
are guaranteed to be in the correct logic state for V
CC
down to 0.8V.
Low supply current makes the G674/G675 ideal for use in
portable equipment. The G674/G675 are available in
5-pin SOT-23-5 and 6 pin TDFN2X2 packages.
Ordering Information
ORDER
NUMBER
G674HxxxT1U
G674LxxxT1U
G675LxxxT1U
G674HxxxRB1U
G674LxxxRB1U
G675LxxxRB1U
* xxx specifies the threshold voltage.
e.g. 240 denotes the 2.4V threshold voltage.
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
PACKAGE
(Green)
SOT-23-5
SOT-23-5
SOT-23-5
TDFN2X2-6
TDFN2X2-6
TDFN2X2-6
Pin Configuration
Typical Application Circuit
V
CC
G674/G675
RESET(RESET)
VCC
R
pull-up*
6
CD
VCC
1
2
G674/G675
3
SOT-23-5
5
CD
GND 1
RESET(RESET)
2
Thermal
Pad
VCC
GND
5 N.C.
4 N.C.
G674/G675
CD
RESET
(RESET)
GND
C
D
µP
RESET
INPUT
GND
VCC 3
4
N.C.
TDFN2X2-6
Note: Recommend connecting the Thermal Pad
to the Ground for excellent power dissipation.
()is for G674H
*G675 ONLY
ICC may increased at high T
A
, Therefore, can not connect
Resistors to VCC to prevent Icc abnormal behavior at high T
A
.
Ver: 1.3
Apr 10, 2012
TEL: 886-3-5788833
http://www.gmt.com.tw
1
京公网安备 11010802033920号
EEWORLD
