G690 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Microprocessor Reset IC

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 V_CC = +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 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’s 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 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
V_CC
V_CC
G690/G691
RESET
(RESET)
GND
V_CC
* R_PULL-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: [phone]
http://www.gmt.com.tw
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