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G690H400T92 Datasheet

  • G690H400T92

  • Microprocessor Reset IC

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Global Mixed-mode Technology Inc.
G690/G691
Microprocessor Reset IC
Features
Precision Monitoring of +3V, +3.3V, and +5V
Power-Supply Voltages
General Description
The G690/G691 are microprocessor (碌P) supervisory
circuits used to monitor the power supplies in 碌P 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, keeping it asserted for at
least 140ms after V
CC
has risen above the reset
threshold. Reset thresholds suitable for operation with
a variety of supply voltages are available.
The G691L has an open-drain output stage, while the
G690 have push-pull outputs. The G691L鈥檚 open-drain
RESET output requires a pull-up resistor that can be
connected to a voltage higher than V
CC
. The G690L
have an active-low RESET output, while the G690H
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 G690/G691 ideal for
use in portable equipment. The G690/G691 are avail-
able in 3-pin SOT89 or SOT23 or SC70 packages.
Fully Specified Over Temperature
Available in Three Output Configurations
Push-Pull RESET Output (G690L)
Push-Pull RESET Output (G690H)
Open-Drain RESET Output (G691L)
140ms min Power-On Reset Pulse Width
10碌A Supply Current
Guaranteed Reset Valid to V
CC
= +1V
Power Supply Transient Immunity
No External Components
3-Pin SOT89, SOT23 and SC70 Packages
Applications
Computers
Controllers
Intelligent Instruments
Critical 碌P and 碌C Power Monitoring
Portable / Battery-Powered Equipment
Automotive
Pin Configuration
Typical Application
V
CC
3
V
CC
R
PULL-UP
*
V
CC
G690/G691
RESET
(RESET)
1
2
3
1
2
GND
RESET
INPUT
碌P
GND
SOT 89
SOT23/SC70
*G691 ONLY
Ver: 1.3
Oct 31, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
1

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