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Электронный компонент: G684L308T1U

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Ver: 1.2
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G684/G685
Global Mixed-mode Technology Inc.
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)
14A 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 P and C Power Monitoring
Portable / Battery-Powered Equipment
Automotive
General Description
The G684/G685 are microprocessor (P) supervisory
circuits used to monitor the power supplies in P 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
-40C ~ +105C SOT23-5
G685LxxxT1U
-40C ~ +105C
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
SOT23-5
G684/G685
5
1
2
RESET
(RESET)
N.C.
4
3
GND
()is for G684H
*G685 ONLY
RESET
INPUT
GND
P
VCC
RESET
(RESET)
GND
G684/G685
VCC
V
CC
R
pull-up*
VCC
GND
SOT23-5
G684/G685
5
1
2
RESET
(RESET)
N.C.
4
3
GND
()is for G684H
*G685 ONLY
RESET
INPUT
GND
P
VCC
RESET
(RESET)
GND
G684/G685
VCC
V
CC
R
pull-up*
VCC
GND
Ver: 1.2
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
2
G684/G685
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
V
CC
..................................................-0.3V to +6.0V
Delay Capacitor Pin Voltage, V
CD
.....-0.3 to (V
CC
+0.3V)
RESET, RESET (push-pull)...........-0.3V to (V
CC
+ 0.3V)
RESET (open drain)...............................-0.3V to +6.0V
Input Current, V
CC
................................................20mA
Output Current, RESET, RESET ........................20mA
Continuous Power Dissipation (T
A
= +70C)
5-Pin SOT23-5 (derate 2.17mW/C above +70C).174mW
Operating Temperature Range ...........-40C to +105C
Storage Temperature Range...............-65C to +150C
Lead Temperature (soldering, 10s)...................+260C
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
(V
CC
= full range, T
A
= -40C to +105C, unless otherwise noted. Typical values are at T
A
= +25C, V
CC
= 5V
for 463/438/400/330 versions, V
CC
= 3.3V for 308/293 versions, and V
CC
= 3V for 263 version.) (Note 1)
PARAMETER SYMBOL
CONDITION
MIN
TYP
MAX
UNIT
T
A
= 0C +70C
0.8
---
5.5
V
CC
Range
T
A
= -40C +105C
1
--- 5.5
V
V
CC
<5.5V, G68_ _463/438/400/330_
--- 16.5
25
Supply Current (SOT23-5)
I
CC
V
CC
<3.6V, G68_ _308/293/263_
--- 13.9 27
A
G69_ _463_
4.50
4.60
4.69
G69_ _438_
4.23
4.32
4.40
G69_ _400_
3.88
3.96
4.04
G69_ _330_
3.25
3.30
3.37
G69_ _308_
3.04
3.10
3.16
G69_ _293_
2.86
2.91
2.96
Reset Threshold
V
TH-
G69_ _263_
2.59
2.64
2.69
V
Reset Threshold Hysterisis
V
HYS
3.6
5.3
7
%
Reset Threshold Tempco
---
70
---
ppm/C
Reset Time Delay
V
CC
from 0V to 5V
---
2
---
ms
RESET
Output Current Low
(push-pull active low,
and open-drain active-low, G684L
and G685L)
I
OL
V
CC
= 2.5V, V
RESET
= 0.5V
8 ---
--- mA
V
CC
= 5V, V
RESET
= 4.5V,
G684L463/438/400/330
4.5 --- ---
V
CC
= 3.3V, V
RESET
= 2.8V,
G684L308/293
3 ---
---
RESET
Output Current High
(push-pull active low, G684L)
I
OH
V
CC
= 3V, V
RESET
= 2.5V,
G684L263
2 ---
---
mA
V
CC
= 5V, V
RESET
= 0.5V,
G684H463/438/400/330
16 --- ---
V
CC
= 3.3V, V
RESET
= 0.5V,
G684H308/293
12 --- ---
RESET Output Current Low
(push-pull active high, G684H)
I
OL
V
CC
= 3V, V
RESET
= 0.5V,
G684H263
10 --- ---
mA
RESET Output Current High
(push-pull active high, G684H)
I
OH
V
CC
= 2.5V, V
RESET
= 2V
2
---
---
mA
RESET
Open-Drain Output Leak-
age Current (G685L)
V
CC
> V
TH
, RESET deasserted
--- --- 1 A
Note 1: Production testing done at T
A
= +25C; limits over temperature guaranteed by design.
Ver: 1.2
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G684/G685
Global Mixed-mode Technology Inc.
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 2.63
Open-Drain
RESET
685Ax
G684H463T1U 4.63
Push-Pull
RESET
684Lx
G684H438T1U
4.38 Push-Pull
RESET 684Kx
G684H400T1U 4.00
Push-Pull
RESET
684Jx
G684H330T1U 3.30
Push-Pull
RESET
684Nx
G684H308T1U 3.08
Push-Pull
RESET
684Ix
G684H293T1U 2.93
Push-Pull
RESET
684Hx
G684H263T1U 2.63
Push-Pull
RESET
684Gx
G684L463T1U 4.63
Push-Pull
RESET
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
Ver: 1.2
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G684/G685
Global Mixed-mode Technology Inc.
Typical Operating Characteristics
(V
CC
= full range, T
A
= -40C to +105C, unless otherwise noted. Typical values are at T
A
= +25C, V
CC
= 5V
for 463/438/400/330 versions, V
CC
= 3.3V for 308/293 versions, and V
CC
= 3V for 263 version.)




Functional Diagram
Figure 1
0
1
2
3
4
5
6
7
8
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 5.5 6
V
CC
(V)
Supply Current (A)
0.96
0.97
0.98
0.99
1
1.01
1.02
1.03
1.04
1.05
1.06
-40 -30 -20 -10
0
10 20 27 30 40 50 60 70 80 90
T
A
, Ambient Temperature (C)
Normalized Ormalized V
TH+
, V
TH-
(V)
0
1
2
3
4
5
6
7
-40
-20
0
20
40
60
80
Temperature (C)
Supply Current (A)
Supply Current vs. V
CC
Supply Curremt vs. Temperature (No Load)
V
CC
=3.3V
V
CC
=5V
V
CC
=2.5V
Normalized Reset Threshold vs. Temperature
V
T
V
TH
() is for G684H
5
V
CC
V
TH
RESET
4
2 GND
+
R
D
5
V
CC
V
TH
RESET
(RESET)
4
2 GND
+
R
D
*
() is for G684H
5
V
CC
V
TH
RESET
4
2 GND
+
R
D
5
V
CC
V
TH
RESET
(RESET)
4
2 GND
+
R
D
*
Ver: 1.2
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G684/G685
Global Mixed-mode Technology Inc.
Pin Description
PIN NAME
FUNCTION
1 N.C.
No
Connection.
2,3 GND Ground
RESET
(G684L/G685L)
RESET
Output remains low while V
CC
is below the reset threshold, and for 2ms typical after V
CC
rises above the reset threshold.
4
RESET (G684H)
RESET Output remains high while V
CC
is below the reset threshold, and for 2ms typical after V
CC
rises above the reset threshold.
5 V
CC
Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
A microprocessor's (P's) reset input starts the P 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 V
CC
supply voltage declines
below a preset threshold (V
TH-
), V
CC
has risen above
the high reset threshold V
TH+
(V
TH-
+V
HYS
). 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.
Ensuring a Valid Reset Output Down to V
CC
= 0
When V
CC
falls below 0.8V, the G684 RESET output
no longer sinks current--it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs con-
nected to RESET can drift to undetermined voltages.
This presents no problem in most applications since
most P and other circuitry is inoperative with
VCC
be-
low 0.8V. However, in applications where RESET ust
be valid down to 0V, adding a pull-down resistor to
RESET causes any stray leakage currents to flow to
ground, holding RESET low (Figure 2). R1's value is
not critical; 100k
is large enough not to load RESET
and small enough to pull RESET to ground.
A 100k
pull-up resistor to V
CC
is also recommended
for the G685L if RESET is required to remain valid for
V
CC
< 0.8V.
Figure2.
RESET
Valid to V
CC
= Ground Circuit
V
CC
RESET
GND
G684
R1
100k
V
CC
RESET
GND
G684
R1
100k
Ver: 1.2
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
6
G684/G685
Global Mixed-mode Technology Inc.
Interfacing to Ps with Bidirectional Reset Pins
Since the RESET output on the G685L is open drain,
this device interfaces easily with Ps that have bidirec-
tional reset pins, such as the Motorola 68HC11. Connect-
ing the P supervisor's RESET output directly to the
microcontroller's (C's) RESET pin with a single pull-up
resistor allows either device to assert reset (Figure 3).

Figure 3. Interfacing to Ps 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 V
CC
pin. However, some systems may use the
open-drain output to level-shift from the monitored sup-
ply to reset circuitry powered by some other supply
(Figure 4). Note that as the G685L's V
CC
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.
Figure 4. G685L Open-Drain
RESET
Output Allows
Use with Multiple Supplies
Benefits of Highly Accurate Reset Threshold
Most P supervisor ICs have reset threshold voltages
between 5% and 10% below the value of nominal sup-
ply voltages. This ensures a reset will not occur within
5% of the nominal supply, but will occur when the sup-
ply is 10% below nominal.
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.
RESET
INPUT
GND
P
V
CC
RESET
GND
G685
V
CC
V
CC
MOTOROLA
68HCXX
R
PULL-UP
RESET
INPUT
GND
P
V
CC
RESET
GND
G685
V
CC
V
CC
MOTOROLA
68HCXX
R
PULL-UP
RESET
INPUT
GND
5V SYSTEM
V
CC
RESET
GND
G685
V
CC
R
PULL-UP
+3.3V
+5.0
RESET
INPUT
GND
5V SYSTEM
V
CC
V
CC
R
PULL-UP
+3.3V
+5.0V
RESET
INPUT
GND
5V SYSTEM
V
CC
RESET
GND
G685
V
CC
R
PULL-UP
+3.3V
+5.0
RESET
INPUT
GND
5V SYSTEM
V
CC
V
CC
R
PULL-UP
+3.3V
+5.0V
Ver: 1.2
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
7
G684/G685
Global Mixed-mode Technology Inc.
Package Information
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
DIMENSIONS IN MILLIMETERS
SYMBOLS
MIN NOM MAX
A 1.00 1.10 1.30
A1 0.00 ----- 0.10
A2 0.70 0.80 0.90
b 0.35 0.40
0.50
C 0.10 0.15 0.25
D 2.70 2.90 3.10
E 1.40 1.60 1.80
e -----
1.90(TYP)
-----
e1 ----- 0.95 -----
H 2.60 2.80 3.00
L 0.37 ------ -----
1
1 5 9
Taping Specification
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.
E
e
D
H
1
L
C
b
A2
A1
A
e1
E
e
D
H
1
L
C
b
A2
A1
A
e1
Feed Direction
SOT23-5 Package Orientation
Feed Direction
SOT23-5 Package Orientation