G684 Datasheet, PDF (1/7 Pages) Global Mixed-mode Technology Inc – Microprocessor Reset IC

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 V_CC = 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 V_CC supply voltage declines
below a preset threshold, with hysteresis after V_CC 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 V_CC. 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 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 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)
V_CC
VCC
G684/G685
RESET
(RESET)
GND
R_pull-up*
VCC
µP
RESET
INPUT
GND
*G685 ONLY
Ver: 1.2
Jun 03, 2004
TEL: [phone]
http://www.gmt.com.tw
1