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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
1
Global Mixed-mode Technology Inc.
G684/G685
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
VCC.……………………………..…….…….-0.3V to +6.0V
Delay Capacitor Pin Voltage, VCD…..-0.3 to (VCC +0.3V)
RESET, RESET (push-pull)....…....-0.3V to (VCC + 0.3V)
RESET (open drain)...…......…................-0.3V to +6.0V
Input Current, VCC ............................…..…............20mA
Output Current, RESET, RESET ......…...............20mA
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23-5 (derate 2.17mW/°C above +70°C).174mW
Operating Temperature Range …...…..-40°C to +105°C
Storage Temperature Range..….…......-65°C to +150°C
Lead Temperature (soldering, 10s)...…...….…...+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress rat-
ings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of
the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics
(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V
for 463/438/400/330 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1)
PARAMETER
SYMBOL
CONDITION
MIN TYP
VCC Range
Supply Current (SOT23-5)
TA = 0°C +70°C
TA = -40°C +105°C
ICC
VCC<5.5V, G68_ _463/438/400/330_
VCC<3.6V, G68_ _308/293/263_
G69_ _463_
0.8 ---
1 ---
--- 16.5
--- 13.9
4.50 4.60
G69_ _438_
4.23 4.32
G69_ _400_
3.88 3.96
Reset Threshold
VTH- G69_ _330_
G69_ _308_
3.25 3.30
3.04 3.10
G69_ _293_
2.86 2.91
Reset Threshold Hysterisis
Reset Threshold Tempco
Reset Time Delay
VHYS
G69_ _263_
VCC from 0V to 5V
2.59 2.64
3.6 5.3
--- 70
--- 2
RESET Output Current Low
(push-pull active low,
and open-drain active-low, G684L
and G685L)
RESET Output Current High
(push-pull active low, G684L)
RESET Output Current Low
(push-pull active high, G684H)
RESET Output Current High
(push-pull active high, G684H)
IOL VCC = 2.5V, V RESET = 0.5V
VCC = 5V, V RESET = 4.5V,
G684L463/438/400/330
IOH
VCC = 3.3V, V RESET = 2.8V,
G684L308/293
VCC = 3V, V RESET = 2.5V,
G684L263
VCC = 5V, VRESET = 0.5V,
G684H463/438/400/330
IOL
VCC = 3.3V, VRESET = 0.5V,
G684H308/293
VCC = 3V, VRESET = 0.5V,
G684H263
IOH VCC = 2.5V, VRESET = 2V
8 ---
4.5 ---
3 ---
2 ---
16 ---
12 ---
10 ---
2 ---
RESET Open-Drain Output Leak-
age Current (G685L)
VCC > VTH, RESET deasserted
--- ---
Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design.
MAX UNIT
5.5
5.5
V
25
27
µA
4.69
4.40
4.04
3.37 V
3.16
2.96
2.69
7%
--- ppm/°C
--- ms
--- mA
---
--- mA
---
---
--- mA
---
--- mA
1 µA
Ver: 1.2
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
2
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