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PDF ( 数据手册 , 数据表 ) G685

零件编号 G685
描述 (G684 / G685) Microprocessor Reset IC
制造商 GMT
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G685 数据手册, 描述, 功能
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Global Mixed-mode Technology Inc.
G684/G685
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 (G684L)
Push-Pull RESET Output (G684H)
Open-Drain RESET Output (G685L)
„14µA Supply Current
„Guaranteed Reset Valid to VCC = 0.8V
„Power Supply Transient Immunity
„5 pin SOT23-5 Packages
„2% Threshold Accuracy
Applications
„Computers
„Controllers
„Intelligent Instruments
„Critical µP and µC Power Monitoring
„Portable / Battery-Powered Equipment
„Automotive
Pin Configuration
General Description
The G684/G685 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 +5V,
+3.3V, +3.0V- powered circuits.
These circuits perform a single function: they assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold, with hysteresis after VCC has
risen above the reset threshold. Reset thresholds
suitable for operation with a variety of supply voltages
are available.
The G685 has an open-drain output stage, while the
G684 have push-pull outputs. The G685L’s open-drain
RESET output requires a pull-up resistor that can be
connected to a voltage higher than VCC. The G684L
have an active-low RESET output, while the G684H
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 0.8V.
Low supply current makes the G684/G685 ideal for
use in portable equipment. The G684/G685 are avail-
able in 5-pin SOT23-5 packages.
Ordering Information
ORDER NUMBER TEMP. RANGE PACKAGE
G684H(L)xxxT1U -40°C ~ +105°C
SOT23-5
G685LxxxT1U
-40°C ~ +105°C
SOT23-5
Note: T1 : SOT23-5
U : Tape & Reel
* xxx specifies the threshold voltage.
e.g. 263 denotes the 2.63V threshold voltage.
Typical Application Circuit
N.C. 1
5 VCC
GND 2 G684/G685
GND 3
SOT23-5
()is for G684H
4 RESET
(RESET)
VCC
VCC
G684/G685
RESET
(RESET)
GND
Rpull-up*
VCC
µP
RESET
INPUT
GND
*G685 ONLY
Ver: 1.2
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
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