GMT G684H293T1U Microprocessor reset ic Datasheet

G684/G685
Global Mixed-mode Technology Inc.
Microprocessor Reset IC
Features
General Description
„Precision Monitoring of +3V, +3.3V, and +5V
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.
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
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 comparator 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.
Applications
„Computers
„Controllers
„Intelligent Instruments
„Critical µP and µC Power Monitoring
„Portable / Battery-Powered Equipment
„Automotive
Low supply current makes the G684/G685 ideal for
use in portable equipment. The G684/G685 are available in 5-pin SOT23-5 packages.
Ordering Information
ORDER NUMBER TEMP. RANGE
G684H(L)xxxT1U
G685LxxxT1U
PACKAGE
-40°C ~ +105°C
-40°C ~ +105°C
SOT23-5
SOT23-5
Note: T1 : SOT23-5
U : Tape & Reel
* xxx specifies the threshold voltage.
e.g. 263 denotes the 2.63V threshold voltage.
Pin Configuration
Typical Application Circuit
VCC
N.C.
1
5
VCC
VCC
VCC
Rpull-up*
GND
2
G684/G685
G684/G685
RESET
(RESET)
GND
3
4
RESET
(RESET)
GND
µP
RESET
INPUT
GND
SOT23-5
()is for G684H
*G685 ONLY
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Ver: 1.2
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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)
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
RESET (open drain)...…......…................-0.3V to +6.0V
Input Current, VCC ............................…..…............20mA
Output Current, RESET, RESET ......…...............20mA
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings 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
VCC Range
Supply Current (SOT23-5)
ICC
Reset Threshold
VTH-
Reset Threshold Hysterisis
Reset Threshold Tempco
Reset Time Delay
VHYS
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)
RESET Open-Drain Output Leakage Current (G685L)
CONDITION
TA = 0°C +70°C
TA = -40°C +105°C
VCC<5.5V, G68_ _463/438/400/330_
VCC<3.6V, G68_ _308/293/263_
G69_ _463_
G69_ _438_
G69_ _400_
G69_ _330_
G69_ _308_
G69_ _293_
G69_ _263_
IOH
IOL
IOH
TYP MAX
UNIT
0.8
1
----4.50
4.23
3.88
3.25
3.04
2.86
2.59
3.6
-----
----16.5
13.9
4.60
4.32
3.96
3.30
3.10
2.91
2.64
5.3
70
2
5.5
5.5
25
27
4.69
4.40
4.04
3.37
3.16
2.96
2.69
7
-----
%
ppm/°C
ms
8
---
---
mA
4.5
---
---
3
---
---
2
---
---
16
---
---
12
---
---
10
---
---
VCC = 2.5V, VRESET = 2V
2
---
---
mA
VCC > VTH, RESET deasserted
---
---
1
µA
VCC from 0V to 5V
IOL
MIN
VCC = 2.5V, V RESET = 0.5V
VCC = 5V, V RESET = 4.5V,
G684L463/438/400/330
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
VCC = 3.3V, VRESET = 0.5V,
G684H308/293
VCC = 3V, VRESET = 0.5V,
G684H263
V
µA
V
mA
mA
Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design.
TEL: 886-3-5788833
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Ver: 1.2
Jun 03, 2004
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Global Mixed-mode Technology Inc.
G684/G685
Selector Guide
PART/SUFFIX
RESET THRESHOLD (V)
OUTPUT TYPE
TOP MARK
G685L463T1U
4.63
Open-Drain RESET
685Gx
G685L438T1U
4.38
Open-Drain RESET
685Fx
G685L400T1U
4.00
Open-Drain RESET
685Ex
G685L330T1U
3.30
Open-Drain RESET
685Dx
G685L308T1U
3.08
Open-Drain RESET
685Cx
G685L293T1U
2.93
Open-Drain RESET
685Bx
G685L263T1U
G684H463T1U
G684H438T1U
G684H400T1U
G684H330T1U
G684H308T1U
G684H293T1U
G684H263T1U
G684L463T1U
2.63
4.63
4.38
4.00
3.30
3.08
2.93
2.63
4.63
Open-Drain RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
685Ax
684Lx
684Kx
684Jx
684Nx
684Ix
684Hx
684Gx
684Fx
G684L438T1U
4.38
Push-Pull RESET
684Ex
G684L400T1U
4.00
Push-Pull RESET
684Dx
G684L330T1U
3.30
Push-Pull RESET
684Mx
G684L308T1U
3.08
Push-Pull RESET
684Cx
G684L293T1U
2.93
Push-Pull RESET
684Bx
G684L263T1U
2.63
Push-Pull RESET
684Ax
Push-Pull RESET
TEL: 886-3-5788833
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Ver: 1.2
Jun 03, 2004
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G684/G685
Global Mixed-mode Technology Inc.
Typical Operating 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.)
Supply Current vs. VCC
Supply Curremt vs. Temperature (No Load)
8
7
VCC=5V
7
6
Supply Current (µA)
Supply Current (µA)
6
5
4
3
VCC=3.3V
5
4
VCC=2.5V
3
2
2
1
1
0
0
0
0.6 1
1.2 1.5 1.8 2.1 2.4 2.7
3
3.2 3.3 3.4 3.5 3.7 3.9
4
4.5
5
-40
5.5 6
VCC (V)
-20
0
20
40
60
80
Temperature (°C)
Normalized Reset Threshold vs. Temperature
Normalized Ormalized V TH+, VTH- (V)
1.06
1.05
1.04
VT
1.03
1.02
1.01
VTH
1
0.99
0.98
0.97
0.96
-40 -30 -20 -10
0
10
20
27
30
40
50
60
70
80
90
TA, Ambient Temperature (°C)
Functional Diagram
5
VCC
5
RD
+
VTH
4
VCC
RD
4
*
RESET
RESET
(RESET)
+
VTH
2 GND
() is for G684H
2
GND
Figure 1
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Ver: 1.2
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G684/G685
Global Mixed-mode Technology Inc.
Pin Description
PIN
NAME
1
2,3
N.C.
GND
4
RESET (G684L/G685L)
RESET (G684H)
5
VCC
FUNCTION
No Connection.
Ground
RESET Output remains low while VCC is below the reset threshold, and for 2ms typical after VCC
rises above the reset threshold.
RESET Output remains high while VCC is below the reset threshold, and for 2ms typical after VCC
rises above the reset threshold.
Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The G685L/G684L/G684H assert reset to
prevent code-execution errors during power-up,
power-down, or brownout conditions. They assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold (VTH-), VCC has risen above
the high reset threshold VTH+ (VTH-+VHYS). The G685L
uses an open-drain output, and the G684L/G684H
have a push-pull output stage. Connect a pull-up resistor
on the G685L’s RESET output to any supply between 0
and 5.5V.
RESET causes any stray leakage currents to flow to
ground, holding RESET low (Figure 2). R1’s value is
not critical; 100kΩ is large enough not to load RESET
and small enough to pull RESET to ground.
A 100kΩ pull-up resistor to VCC is also recommended
for the G685L if RESET is required to remain valid for
VCC < 0.8V.
VCC
Ensuring a Valid Reset Output Down to VCC = 0
When VCC falls below 0.8V, the G684 RESET output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs connected to RESET can drift to undetermined voltages.
This presents no problem in most applications since
most µP and other circuitry is inoperative with VCC below 0.8V. However, in applications where RESET ust
be valid down to 0V, adding a pull-down resistor to
G684
RESET
GND
R1
100k
Figure2. RESET Valid to VCC = Ground Circuit
TEL: 886-3-5788833
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Ver: 1.2
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G684/G685
Global Mixed-mode Technology Inc.
Interfacing to µPs with Bidirectional Reset Pins
Since the RESET output on the G685L is open drain,
this device interfaces easily with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the µP supervisor’s RESET output directly to the
+5.0
+5.0V
+3.3V
VCC
VCC
RPULL-UP
microcontroller’s (µC’s) RESET pin with a single pull-up
resistor allows either device to assert reset (Figure 3).
G685
RESET
5V SYSTEM
RESET
INPUT
VCC
GND
VCC
GND
VCC
RPULL-UP
G685
RESET
GND
µP
Figure 4. G685L Open-Drain RESET Output Allows
Use with Multiple Supplies
RESET MOTOROLA
INPUT
68HCXX
GND
Benefits of Highly Accurate Reset Threshold
Most µP supervisor ICs have reset threshold voltages
between 5% and 10% below the value of nominal supply voltages. This ensures a reset will not occur within
5% of the nominal supply, but will occur when the supply is 10% below nominal.
Figure 3. Interfacing to µPs with Bidirectional Reset
I/O
G685L Open-Drain RESET Output Allows Use with
Multiple Supplies
Generally, the pull-up connected to the G685L will
connect to the supply voltage that is being monitored at
the IC’s VCC pin. However, some systems may use the
open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply
(Figure 4). Note that as the G685L’s VCC decreases
below 1V, so does the IC’s ability to sink current at
RESET . Also, with any pull-up, RESET will be pulled
high as VCC decays toward 0. The voltage where this
occurs depends on the pull-up resistor value and the
voltage to which it is connected.
When using ICs rated at only the nominal supply ±5%,
this leaves a zone of uncertainty where the supply is
between 5% and 10% low, and where the reset may or
may not be asserted.
The G68_ _463/G68_ _308 use highly accurate circuitry to
ensure that reset is asserted close to the 5% limit, and
long before the supply has declined to 10% below nominal.
TEL: 886-3-5788833
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Ver: 1.2
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G684/G685
Global Mixed-mode Technology Inc.
Package Information
C
D
L
H
E
θ1
e1
e
A
A2
A1
b
Note:
1. Package body sizes exclude mold flash protrusions or gate burrs
2. Tolerance ±0.1000 mm (4mil) unless otherwise specified
3. Coplanarity: 0.1000mm
4. Dimension L is measured in gage plane
SYMBOLS
A
A1
A2
b
C
D
E
e
e1
H
L
θ1
MIN
DIMENSIONS IN MILLIMETERS
NOM
1.00
0.00
0.70
0.35
0.10
2.70
1.40
--------2.60
0.37
1º
1.10
----0.80
0.40
0.15
2.90
1.60
1.90(TYP)
0.95
2.80
-----5º
MAX
1.30
0.10
0.90
0.50
0.25
3.10
1.80
--------3.00
----9º
Taping Specification
Feed Direction
SOT23-5 Package Orientation
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
TEL: 886-3-5788833
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Ver: 1.2
Jun 03, 2004
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