SGM708-LYS8G/TR [SGMICRO]
Low-Cost, Microprocessor Supervisory Circuit;
| 型号： | SGM708-LYS8G/TR |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Low-Cost, Microprocessor Supervisory Circuit |
| 文件： | 总13页 (文件大小：1054K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM708
Low-Cost, Microprocessor
Supervisory Circuit
GENERAL DESCRIPTION
FEATURES
The SGM708 microprocessor supervisory circuit
reduces the complexity and number of components
required to monitor power supply and monitor
microprocessor activity. It significantly improves system
reliability and accuracy compared to separate ICs or
discrete components.
● Precision Supply-Voltage Monitor
4.65V for SGM708-L
4.40V for SGM708-M
4.0V for SGM708-J
3.08V for SGM708-T
2.93V for SGM708-S
2.63V for SGM708-R
The SGM708 provides power supply monitoring
circuitry that generates a reset output during power-up,
power-down and brownout conditions. The reset output
remains operational with VCC as low as 1V.
● Guaranteed
Valid at VCC = 1V
RESET
● 200ms Reset Pulse Width
● Debounced TTL/CMOS-Compatible
Manual-Reset Input
In addition, there is a 1.25V threshold detector for
power-fail warning, low-battery detection, or monitoring
an additional power supply. An active-low manual-reset
● Voltage Monitor for Power-Fail or Low-Battery
Warning
● Dual Reset Outputs:
input ( ) is also included.
MR
(Active-Low and Active-High)
● -40℃ to +85℃ Operating Temperature Range
● Available in Green SOIC-8 Package
The SGM708 is available in Green SOIC-8 package. It
operates over an ambient temperature range of -40℃
to +85℃.
APPLICATIONS
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical μP Power Monitoring
SG Micro Corp
DECEMBER 2017 – REV. A. 4
www.sg-micro.com
Low-Cost, Microprocessor
Supervisory Circuit
SGM708
PACKAGE/ORDERING INFORMATION
RESET
THRESHOLD (V)
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
4.65
4.40
4.0
SOIC-8
SOIC-8
SOIC-8
SOIC-8
SOIC-8
SOIC-8
SGM708-LYS8G/TR
SGM708-MYS8G/TR
SGM708-JYS8G/TR
SGM708-TYS8G/TR
SGM708-SYS8G/TR
SGM708-RYS8G/TR
SGM708-LYS8
SGM708-MYS8
SGM708-JYS8
SGM708-TYS8
SGM708-SYS8
SGM708-RYS8
Tape and Reel, 2500
Tape and Reel, 2500
Tape and Reel, 2500
Tape and Reel, 2500
Tape and Reel, 2500
Tape and Reel, 2500
SGM708
3.08
2.93
2.63
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen
substances. If you have additional comments or questions, please contact your SGMICRO representative directly.
OVERSTRESS CAUTION
NOTE: Order number is defined as the follow:
ORDER NUMBER
SGM 708- X Y X G / TR
Tape and Reel
Stresses beyond those listed may cause permanent damage
to the device. Functional operation of the device at these or
any otherconditions beyond those indicated in the operational
sectionof thespecification is not implied. Exposureto absolute
maximum rating conditions for extended periods may affect
reliability.
Green product
Package Type
S8
Operating Temperature Range
-40℃ to +85℃
SOIC-8
Y
ESD SENSITIVITY CAUTION
RESET THRESHOLD
This integrated circuit can be damaged by ESD if you don’t
pay attention to ESD protection. SGMICRO recommends that
all integrated circuits be handled with appropriate precautions.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because very small parametric changes could cause the
device not to meet its published specifications.
L: 4.65V
M: 4.40V
J: 4.0V
T: 3.08V
S: 2.93V
R: 2.63V
ABSOLUTE MAXIMUM RATINGS
(Typical values are at TA = +25℃, unless otherwise noted.)
Terminal Voltage (with respect to GND)
DISCLAIMER
VCC ................................................................ -0.3V to 6.0V
SG Micro Corp reserves the right to make any change in
circuitdesign, specificationor other related things if necessary
without notice at any time.
All Other Inputs ................................. -0.3V to (VCC + 0.3V)
Input Current, VCC .........................................................20mA
GND ..........................................................................20mA
Output Current, (all outputs) .........................................20mA
Operating Temperature Range.......................-40℃ to +85℃
Junction Temperature.................................................+150℃
Storage Temperature Range........................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
HBM.............................................................................4000V
MM.................................................................................300V
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
2
Low-Cost, Microprocessor
Supervisory Circuit
SGM708
TYPICAL APPLICATION CIRCUIT
UNREGULATED DC
+5V DC LINEAR
REGULATOR
MICROPROCESSOR
VCC
VCC
RESET/RESET
RESET/RESET
SGM708
PFI
INTERRUPT
MR
PFO
PUSHBUTTON
SWITCH
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
3
Low-Cost, Microprocessor
Supervisory Circuit
SGM708
PIN CONFIGURATION
SGM708 (TOP VIEW)
RESET
RESET
NC
1
2
3
4
8
7
6
5
MR
VCC
SGM708
GND
PFI
PFO
SOIC-8
PIN DESCRIPTION
PIN
NAME
FUNCTION
Manual-Reset Input triggers a reset pulse when pulled below 0.8V. This active-low input has an internal
250μA (VCC = +5V) pull-up current. It can be driven from a TTL or CMOS logic line as well as shorted to
ground with a switch.
1
MR
2
3
VCC
Power Supply Voltage that is monitored.
GND
0V Ground Reference for all signals.
Power-Fail Voltage Monitor Input. When PFI is less than 1.25V,
VCC when not used.
goes low. Connect PFI to GND or
PFO
4
PFI
5
6
Power-Fail Output goes low and sinks current when PFI is less than 1.25V; otherwise
stays high.
PFO
PFO
NC
No Connect.
Active-Low Reset Output pulses low for 200ms when triggered, and stays low whenever VCC is below the
reset threshold (4.65V for SGM708-L, 4.40V for SGM708-M, 4.0V for SGM708-J, 3.08V for SGM708-T,
2.93V for SGM708-S and 2.63V for SGM708-R). It remains low for 200ms after VCC rises above the reset
7
8
RESET
RESET
threshold or
goes from low to high.
MR
Active-High Reset Output is the inverse of
versa.
. Whenever
is high, RESET is low, and vice
RESET
RESET
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
4
Low-Cost, Microprocessor
Supervisory Circuit
SGM708
ELECTRICAL CHARACTERISTICS
(VCC = 4.75V to 5.5V for SGM708-L; VCC = 4.5V to 5.5V for SGM708-M; VCC = 4.07V to 5.5V for SGM708-J; VCC = 3.14V to 5.5V
for SGM708-T; VCC = 2.95V to 5.5V for SGM708-S; VCC = 2.68V to 5.5V for SGM708-R; TA = -40°C to +85°C, unless otherwise
noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
5.5
UNITS
V
Operating Voltage Range (VCC
)
1.0
Supply Current (ISUPPLY
)
20
4.65
4.4
60
μA
SGM708-L
SGM708-M
SGM708-J
SGM708-T
SGM708-S
SGM708-R
4.5
4.75
4.5
4.25
3.91
3.02
2.85
2.56
4.0
4.07
3.14
2.95
2.68
Reset Threshold (VRT
)
V
3.08
2.93
2.63
25
SGM708-T, SGM708-S, SGM708-R
SGM708-J
Reset Threshold Hysteresis
35
mV
ms
V
SGM708-L, SGM708-M
40
Reset Pulse Width (tRS
)
120
200
290
I
SOURCE = 800μA
0.7 × VCC
ISINK = 3.2mA
0.4
0.3
Output Voltage
RESET
VCC = 1V, ISINK = 50μA
ISOURCE = 800µA
ISINK = 1.2mA
0.7 × VCC
V
V
RESET Output Voltage
0.4
100
250
250
600
μA
ns
Pull-Up Current
Pulse Width (tMR
= 0V
MR
MR
MR
)
Low
High
0.8
V
TA = +25℃
Input Threshold
MR
MR
2
100
1.25
0.2
350
1.3
ns
V
to Reset Out Delay (tMD
)
PFI Input Threshold
PFI Input Current
VCC = 5V
1.17
nA
ISOURCE = 800μA
0.7 × VCC
V
Output Voltage
PFO
ISINK = 3.2mA
0.4
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
5
Low-Cost, Microprocessor
Supervisory Circuit
SGM708
FUNCTIONAL BLOCK DIAGRAM
8
VCC
RESET
250μA
1
MR
RESET
7
RESET
GENERATOR
2
VCC
+
_
SGM708
4.65V for SGM708-L *
4
+
_
5
PFI
PFO
1.25V
3
GND
* 4.65V for SGM708-L
4.40V for SGM708-M
4.0V for SGM708-J
3.08V for SGM708-T
2.93V for SGM708-S
2.63V for SGM708-R
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
6
Low-Cost, Microprocessor
Supervisory Circuit
SGM708
TYPICAL PERFORMANCE CHARACTERISTICS
2kΩ
VCC
VCC
RESET
GND
+5V
PFI
+
-
RESET
330pF
PFO
30pF
1kΩ
+1.25V
10kΩ
VCC
VCC
RESET
10kΩ
+5V
RESET
GND
330pF
330pF
1kΩ
PFI
PFO
30pF
+
-
+1.25V
10kΩ
VCC
VCC
RESET
10kΩ
RESET
GND
330pF
330pF
VCC
RESET
GND
330pF
10kΩ
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
7
Low-Cost, Microprocessor
Supervisory Circuit
SGM708
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
8
Low-Cost, Microprocessor
Supervisory Circuit
SGM708
APPLICATION INFORMATION
Monitoring a Negative Voltage
Ensuring a Valid RESET Output Down to
VCC = 0V
The power-fail comparator can also monitor a negative
supply rail (Figure 3). When the negative rail is good (a
When VCC falls below 1V, the SGM708
output
RESET
negative voltage of large magnitude),
is low, and
PFO
no longer sinks current-it becomes an open circuit.
High-impedance CMOS logic inputs can drift to
undetermined voltages if left undriven. If a pull-down
when the negative rail is degraded (a negative voltage
of lesser magnitude), is high. By adding the
PFO
resistors and transistor as shown, a high
triggers
PFO
resistor is added to the
pin as shown in Figure
RESET
reset. As long as
remains high, the SGM708 will
PFO
1, any stray charge or leakage currents will be drained
to ground, holding low. Resistor value (R1) is
keep reset asserted (
= low, RESET = high).
RESET
RESET
Note that this circuit’s accuracy depends on the PFI
not critical. It should be about 100kΩ, large enough not
threshold tolerance, the VCC line, and the resistors.
to load
ground.
and small enough to pull
to
RESET
RESET
+5V
100kΩ
VCC
MR
R1
R2
SGM708
100kΩ
PFI
SGM708
PFO
2N3904
RESET
GND
TO μP
RESET
R1
V-
+5V
0V
MR
+5V
0V
PFO
Figure 1.
Valid to Ground Circuit
RESET
VTRIP
0V
V-
Monitoring Voltages Other Than the
Unregulated DC Input
Monitor voltages other than the unregulated DC by
connecting a voltage divider to PFI and adjusting the
ratio appropriately. If required, add hysteresis by
connecting a resistor (with a value approximately 10
times the sum of the two resistors in the potential
5 – 1.25
R1
1.25 - VTRIP
R2
=
VTRIP < 0
Figure 3. Monitoring a Negative Voltage
Interfacing to μPs with Bidirectional Reset
Pins
μPs with bidirectional reset pins, such as the Motorola
68HC11 series, can contend with the SGM708
output. If, for example, the
and the Microprocessor wants to pull it low,
indeterminate logic levels may result. To correct this,
connect a 4.7kΩ resistor between the
and the μP reset I/O, as in Figure 4. Buffer the
output to other system components.
RESET
divider network) between PFI and
. A capacitor
PFO
output is driven high
RESET
between PFI and GND will reduce the power-fail
circuit’s sensitivity to high-frequency noise on the line
being monitored.
can be asserted on other
RESET
output
RESET
RESET
voltages in addition to the +5V VCC line. Connect
PFO
to
to initiate a
pulse when PFI drops
RESET
MR
below 1.25V. Figure 2 shows the SGM708 configured
to assert when the +5V supply falls below the
RESET
BUFFRED RESET TO OTHER SYSTEM COMPONENTS
reset threshold, or when the +12V supply falls below
approximately 11V.
VCC
VCC
+12V
+5V
Microprocessor
SGM708
4.7kΩ
RESET
RESET
TO μP
VCC
RESET
1MΩ
1%
GND
GND
SGM708 MR
130kΩ
1%
PFI
PFO
Figure 4. Interfacing to Microprocessors with
Bidirectional Reset I/O
GND
Figure 2. Monitoring Both +5V and +12V
SG Micro Corp
DECEMBER 2017
www.sg-micro.com
9
Low-Cost, Microprocessor
Supervisory Circuit
SGM708
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DECEMBER 2017 ‒ REV.A.3 to REV.A.4
Changed Electrical Characteristics section..........................................................................................................................................................5
JANUARY 2013 ‒ REV.A.2 to REV.A.3
Added Recommended Land Pattern Information ..............................................................................................................................................10
Added Tape and Reel Information ...............................................................................................................................................................11, 12
MARCH 2011 ‒ REV.A.1 to REV.A.2
Updated Package Description ...........................................................................................................................................................................All
MAY 2010 ‒ REV.A to REV.A.1
Added Reset Threshold.....................................................................................................................................................................................All
Changes from Original (APRIL 2010) to REV.A
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
10
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
SOIC-8
0.6
D
e
2.2
E1
E
5.2
b
1.27
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
A1
c
θ
A2
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
1.750
0.250
1.550
0.510
0.250
5.100
4.000
6.200
MIN
MAX
0.069
0.010
0.061
0.020
0.010
0.200
0.157
0.244
A
A1
A2
b
1.350
0.100
1.350
0.330
0.170
4.700
3.800
5.800
0.053
0.004
0.053
0.013
0.006
0.185
0.150
0.228
c
D
E
E1
e
1.27 BSC
0.050 BSC
L
0.400
0°
1.270
8°
0.016
0°
0.050
8°
θ
SG Micro Corp
www.sg-micro.com
TX00010.000
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
SOIC-8
13″
12.4
6.40
5.40
2.10
4.0
8.0
2.0
12.0
Q1
SG Micro Corp
TX10000.000
www.sg-micro.com
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Reel Type
Pizza/Carton
13″
386
280
370
5
SG Micro Corp
www.sg-micro.com
TX20000.000
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