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G690_15 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Microprocessor Reset IC | |||
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Global Mixed-mode Technology
G690/G691
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 (G690L)
Push-Pull RESET Output (G690H)
Open-Drain RESET Output (G691L)
 140ms min Power-On Reset Pulse Width
 10µA Supply Current
 Guaranteed Reset Valid to VCC = +1V
 Power Supply Transient Immunity
 No External Components
 3-Pin SOT-23 and SC-70-3(SOT-323) Packages
Applications
 Computers
 Controllers
 Intelligent Instruments
 Critical µP and µC Power Monitoring
 Portable / Battery-Powered Equipment
 Automotive
General Description
The G690/G691 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 VCC supply voltage declines
below a preset threshold, keeping it asserted for at
least 140ms after VCC 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 G691Lâs open-drain
RESET output requires a pull-up resistor that can be
connected to a voltage higher than VCC. 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 VCC,
and the outputs are guaranteed to be in the correct
logic state for VCC down to 1V.
Low supply current makes the G690/G691 ideal for use
in portable equipment. The G690/G691 are available in
3-pin SOT-23 and SC-70-3(SOT-323) packages.
Pin Configuration
3
1
2
SOT-23/SC-70-3(SOT-323)
Ver: 2.7
Oct 11, 2013
Typical Application Circuit
VCC
VCC
G690/G691
RESET
(RESET)
GND
VCC
* RPULL-UP
µP
RESET
INPUT
GND
*G691 ONLY
ICC may increased at high TA, Therefore, can not connect
Resistors to VCC to prevent Icc abnormal behavior at high TA.
TEL: 886-3-5788833
http://www.gmt.com.tw
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