SGM8714B-1 [SGMICRO]
Small Size, Nano Power, Low Voltage Comparator;
| 型号： | SGM8714B-1 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Small Size, Nano Power, Low Voltage Comparator |
| 文件： | 总19页 (文件大小：987K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM8714A-1/SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
GENERAL DESCRIPTION
FEATURES
The SGM8714A-1 and SGM8714B-1 are single, nano-
power, small size comparators. They are optimized for
low voltage operation from 1.6V to 5.5V single supply,
consuming only 300nA quiescent current. Both devices
are packaged in a space-saving XTDFN package, which
is 1mm × 1mm. The combination of these features makes
them good choices for smart battery-powered equipment.
Meanwhile, the SGM8714A-1 and SGM8714B-1 also
have a great trade-off between low power and high
speed, whose propagation delay is only 6μs. This result
in a continuous system monitoring and quick respond
to fault conditions without too much battery power
dissipation.
● Ultra-Low Supply Current: 300nA (TYP)
● Low Propagation Delay: 6µs (TYP)
● Supply Voltage Range: 1.6V to 5.5V
● Rail-to-Rail Input Common Mode Voltage
● Different Output Structures
Push-Pull Output: SGM8714A-1
Open-Drain Output: SGM8714B-1
● Internal Hysteresis: 6mV
● -40℃ to +125℃ Operating Temperature Range
● Available in a Green XTDFN-1×1-6L Package
APPLICATIONS
Cell Phones
These devices have different output structures. The
SGM8714A-1 has a push-pull output structure, which
can easily drive the LED, resistive or capacitive load
with the ability of sourcing or sinking the current for the
level of milliamp. The SGM8714B-1 has an open-drain
output structure, which needs an external pull-up resistor
to output a high level beyond VS. And several outputs
can be connected together to achieve wired-AND logic.
Battery-Powered Equipment
IR Receivers
The SGM8714A-1 and SGM8714B-1 are both available
in a Green XTDFN-1×1-6L package. It is rated over the
-40℃ to +125℃ operating temperature range.
SG Micro Corp
MARCH 2021 – REV. A
www.sg-micro.com
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
DESCRIPTION
XTDFN-1×1-6L
XTDFN-1×1-6L
SGM8714A-1
SGM8714B-1
SGM8714A-1XXDM6G/TR
SGM8714B-1XXDM6G/TR
JX
Tape and Reel, 10000
Tape and Reel, 10000
-40℃ to +125℃
-40℃ to +125℃
KX
MARKING INFORMATION
NOTE: X = Date Code.
Y X
Date Code - Quarter
Serial Number
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.
ABSOLUTE MAXIMUM RATINGS
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
Supply Voltage, +VS to -VS ................................................6V
Voltage at Input/Output Pins....... (-VS) - 0.3V to (+VS) + 0.3V
Junction Temperature.................................................+150℃
Storage Temperature Range.......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged if ESD protections are
not considered carefully. 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 even small parametric changes could cause the
device not to meet the published specifications.
HBM.............................................................................8000V
CDM ............................................................................1000V
RECOMMENDED OPERATING CONDITIONS
Supply Voltage....................................................1.6V to 5.5V
Operating Temperature Range....................-40℃ to +125℃
OVERSTRESS CAUTION
DISCLAIMER
SG Micro Corp reserves the right to make any change in
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
MARCH 2021
2
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
PIN CONFIGURATION
(TOP VIEW)
+IN
-VS
-IN
1
2
3
6
5
4
+VS
+
NC
_
OUT
XTDFN-1×1-6L
PIN DESCRIPTION
PIN
1
NAME
+IN
FUNCTION
Non-Inverting Input.
2
-VS
Negative Power Supply.
Inverting Input.
3
-IN
4
OUT
NC
Output.
5
Not Connected.
Positive Power Supply.
6
+VS
SG Micro Corp
www.sg-micro.com
MARCH 2021
3
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
ELECTRICAL CHARACTERISTICS
(VS = 1.6V to 5V, VCM = VS/2, Full = -40℃ to +125℃, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
TEMP
+25℃
Full
MIN
TYP
MAX UNITS
1
10
Input Offset Voltage
VOS
VCM = VS/2
VCM = VS/2
mV
12
3
6
8
+25℃
Full
Hysteresis
VHYST
mV
10
1.5
-VS
Input Common Mode Voltage Range
Maximum Differential Input Voltage
Input Bias Current
VCM
|VID|
IB
Full
VS
VS
V
V
Full
VS = 5V, VCM = VS/2
VS = 5V, VCM = VS/2
15
20
pA
pA
+25℃
Input Offset Current
IOS
+25℃
+25℃
Full
4.79
4.75
4.855
Output Voltage High
(for SGM8714A-1 Only)
VOH
VS = 5V, IOUT = 3mA
V
85
150
175
+25℃
Full
Output Voltage Low
VOL
ILKG
VS = 5V, IOUT = -3mA
mV
pA
dB
Open-Drain Output Leakage Current
(for SGM8714B-1 Only)
VS = 5V, VID = +0.1V (output high), VPULL-UP = VS
30
69
+25℃
52
45
66
61
27
39
+25℃
Full
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Short-Circuit Current
CMRR -VS < VCM < VS
88
+25℃
Full
PSRR
ISC
VS = 1.6V to 5.5V, VCM = VS/2
dB
mA
nA
VS = 5V, sourcing (for SGM8714A-1 only)
VS = 5V, sinking
36
60
+25℃
+25℃
+25℃
Full
300
540
755
Quiescent Current
IQ
VS = 5V, IOUT = 0A, VID = -0.1V (output low)
SWITCHING CHARACTERISTICS
(VS = 5V, VCM = 2.5V, CL = 15pF, input overdrive = 100mV, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
TEMP
MIN
TYP
MAX UNITS
Propagation Delay Time, High-to-Low
(for SGM8714B-1 Only)
Propagation Delay Time, Low-to-High
(for SGM8714B-1 Only)
tPHL
RP = 2.5kΩ
RP = 2.5kΩ
4
µs
+25℃
tPLH
6
µs
+25℃
Rise Time (for SGM8714A-1 Only)
Fall Time
tR
tF
20% to 80%
80% to 20%
6
6
1
ns
ns
+25℃
+25℃
+25℃
Power-Up Time
tON
ms
TIMING DIAGRAM
VREF + 100mV
Input
Input
+
VREF
Output
_
V
REF - 100mV
+VS
tPLH
tPHL
80%
+
_
VREF
80%
Output
50%
20%
50%
20%
tF
-VS
tR
NOTE: The offset voltage and the hysteresis result in the propagation delay of the comparator output.
Figure 1. Propagation Delay Timing Diagram
SG Micro Corp
www.sg-micro.com
MARCH 2021
4
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
TYPICAL PERFORMANCE CHARACTERISTICS
At TA = +25℃, unless otherwise noted.
SGM8714A-1 Propagation Delay (L-H) vs. Input Overdrive
12
SGM8714A-1 Propagation Delay (H-L) vs. Input Overdrive
10
— -40℃
— -40℃
— +25℃
— +85℃
— +125℃
VS = 3.3V
VS = 3.3V
— +25℃
10
— +85℃
8
6
4
2
0
— +125℃
8
6
4
2
0
0
100
200
300
400
500
0
100
200
300
400
500
Input Overdrive (mV)
Input Overdrive (mV)
SGM8714A-1 Propagation Delay (L-H) vs. Input Overdrive
12
SGM8714A-1 Propagation Delay (H-L) vs. Input Overdrive
10
— -40℃
VS = 5V
VS = 5V
— -40℃
— +25℃
— +25℃
10
— +85℃
8
— +85℃
— +125℃
— +125℃
8
6
6
4
2
0
4
2
0
0
100
200
300
400
500
0
100
200
300
400
500
Input Overdrive (mV)
Input Overdrive (mV)
SGM8714B-1 Propagation Delay (L-H) vs. Input Overdrive
8
SGM8714B-1 Propagation Delay (H-L) vs. Input Overdrive
10
— -40℃
— +25℃
— +85℃
— +125℃
— -40℃
VS = 3.3V
RP = 2.5kΩ
VS = 5V
RP = 2.5kΩ
— +25℃
— +85℃
8
6
4
2
0
6
4
2
0
— +125℃
0
100
200
300
400
500
0
100
200
300
400
500
Input Overdrive (mV)
Input Overdrive (mV)
SG Micro Corp
www.sg-micro.com
MARCH 2021
5
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, unless otherwise noted.
Hysteresis vs. Temperature
VCM = VS
Hysteresis vs. Temperature
VCM = VS
8
7
6
5
4
3
8
7
6
5
4
3
VS = 1.6V
VS = 3.3V
VCM = VS/2
VCM = VS/2
VCM = 0
VCM = 0
-50
-25
0
25
50
75
100 125
-50
-25
0
25
50
75
100 125
Temperature (℃)
Temperature (℃)
Hysteresis vs. Temperature
VCM = VS
Hysteresis vs. Input Common Mode Voltage
8
7
6
5
4
3
10
8
VS = 5V
VS = 1.6V
-40℃
6
4
+25℃
VCM = VS/2
+125℃
VCM = 0
2
0
-50
-25
0
25
50
75
100 125
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6
Input Common Mode Voltage (V)
Temperature (℃)
Hysteresis vs. Input Common Mode Voltage
Hysteresis vs. Input Common Mode Voltage
10
8
10
8
VS = 3.3V
VS = 5V
-40℃
-40℃
6
6
4
4
+25℃
+25℃
+125℃
+125℃
2
2
0
0
0
0.5
1
1.5
2
2.5
3
3.5
0
1
2
3
4
5
Input Common Mode Voltage (V)
Input Common Mode Voltage (V)
SG Micro Corp
www.sg-micro.com
MARCH 2021
6
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, unless otherwise noted.
Input Offset Voltage vs. Temperature
VS = 1.6V
Input Offset Voltage vs. Temperature
VS = 3.3V
0
-0.3
-0.6
-0.9
-1.2
-1.5
1
0.6
0.2
-0.2
-0.6
-1
VCM = 0
VCM = VS
VCM = 0
VCM = VS/2
VCM = VS/2
VCM = VS
-50
-25
0
25
50
75
100 125
-50
-25
0
25
50
75
100 125
Temperature (℃)
Temperature (℃)
Input Offset Voltage vs. Temperature
VS = 5V
Input Offset Voltage vs. Input Common Mode Voltage
1
0.6
0.2
-0.2
-0.6
-1
1
0.5
0
VS = 1.6V
-40℃
VCM = VS
-0.5
-1
+25℃
VCM = 0
VCM = VS/2
+125℃
-1.5
-2
-50
-25
0
25
50
75
100 125
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6
Input Common Mode Voltage (V)
Temperature (℃)
Input Offset Voltage vs. Input Common Mode Voltage
VS = 3.3V
Input Offset Voltage vs. Input Common Mode Voltage
VS = 5V
1
0.5
0
1
0.5
0
-40℃
-40℃
-0.5
-1
-0.5
-1
+25℃
+125℃
+25℃
+125℃
-1.5
-2
-1.5
-2
0
0.5
1
1.5
2
2.5
3
3.5
0
1
2
3
4
5
Input Common Mode Voltage (V)
Input Common Mode Voltage (V)
SG Micro Corp
www.sg-micro.com
MARCH 2021
7
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, unless otherwise noted.
Output Voltage High vs. Output Short-Circuit (Source) Current
1.6
Output Voltage High vs. Output Short-Circuit (Source) Current
5
4.95
4.9
VS = 1.6V
VS = 5V
-40℃
-40℃
1.58
1.56
4.85
4.8
+25℃
+25℃
1.54
+125℃
1.52
4.75
4.7
+125℃
1.5
0.1
0.2
0.3
0.4
0.5
0
1
2
3
4
5
Output Short-Circuit (Source) Current (mA)
Output Short-Circuit (Source) Current (mA)
Output Voltage Low vs. Output Short-Circuit (Sink) Current
Output Voltage Low vs. Output Short-Circuit (Sink) Current
250
50
VS = 1.6V
VS = 5V
40
200
150
100
50
+125℃
+125℃
+25℃
30
20
+25℃
10
-40℃
-40℃
0
0
0.1
0.2
0.3
0.4
0.5
0
1
2
3
4
5
Output Short-Circuit (Sink) Current (mA)
Output Short-Circuit (Sink) Current (mA)
Output Short-Circuit (Source) Current vs. Temperature
60
Output Short-Circuit (Sink) Current vs. Temperature
80
70
60
50
40
30
20
50
40
30
20
10
0
VS = 5.5V
VS = 5.5V
VS = 3.5V
VS = 3.5V
-50
-25
0
25
50
75
100 125
-50
-25
0
25
50
75
100 125
Temperature (℃)
Temperature (℃)
SG Micro Corp
www.sg-micro.com
MARCH 2021
8
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, unless otherwise noted.
Output Short-Circuit (Source) Current vs. Supply Voltage
60
Output Short-Circuit (Sink) Current vs. Supply Voltage
70
60
50
40
30
20
10
0
50
40
30
20
10
0
+125℃
-40℃
+25℃
-40℃
+25℃
+125℃
1.5
2.5
3.5
Supply Voltage (V)
4.5
5.5
1.5
2.5
3.5
Supply Voltage (V)
4.5
5.5
Quiescent Current vs. Temperature
Quiescent Current vs. Supply Voltage
VCM = VS/2
0.6
0.5
0.4
0.3
0.2
0.1
0.6
0.5
0.4
0.3
0.2
0.1
0
+125℃
VS = 5V
VS = 1.6V
-40℃
+25℃
-50
-25
0
25
50
75
100 125
1.5
2.5
3.5
Supply Voltage (V)
4.5
5.5
Temperature (℃)
Quiescent Current vs. Input Common Mode Voltage
VS = 3.3V
Quiescent Current vs. Input Common Mode Voltage
VS = 5.5V
0.6
0.5
0.4
0.3
0.2
0.1
0
0.6
0.5
0.4
0.3
0.2
0.1
0
+125℃
+125℃
-40℃
+25℃
-40℃
+25℃
0
0.5
1
1.5
2
2.5
3
3.5
0
1
2
3
4
5
6
Input Common Mode Voltage (V)
Input Common Mode Voltage (V)
SG Micro Corp
www.sg-micro.com
MARCH 2021
9
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
At TA = +25℃, unless otherwise noted.
Input Bias Current vs. Temperature
Rise/Fall Time vs. Load Capacitance
10000
8000
6000
4000
2000
0
10000
1000
100
10
VS = 5V
CM = VS/2
VS = 5V
CM = VS/2
V
V
Rise Time
Fall Time
1
-50
-25
0
25
50
75
100 125
10
100
1000
10000
100000
Load Capacitance (pF)
Temperature (℃)
SG Micro Corp
www.sg-micro.com
MARCH 2021
10
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
DETAILED DESCRIPTION
The SGM8714A-1 and SGM8714B-1 are single, nano-
power, rail-to-rail input and small size comparators.
They are optimized for low voltage operation from 1.6V
to 5.5V single supply, consuming only 300nA quiescent
current. The output stage of the comparator is open-drain
and push-pull. Both devices are packaged in a
space-saving XTDFN package, which makes them
good choices for portable devices.
Internal Hysteresis
The hysteresis curve is shown in Figure 2. The following
three components are related to the hysteresis of the
SGM8714A-1 and SGM8714B-1, which are VTH, VOS,
and VHYST
.
Device Function
Inputs
The maximum input common mode voltage range of
the comparator is from -VS to +VS.
To protect the inputs of the comparator from going out
of range, the internal diode connected to -VS is taken
into account. To explain, the internal diode can be
forward biased if the input voltage is below -VS and the
input bias current of the comparator is increasing
exponentially at this situation.
V
TH + VOS
VTH + VOS + (VHYST/2)
VTH + VOS –(VHYST/2)
NOTES:
VTH is the trip voltage or set voltage of the comparator.
OS is defined as the input offset voltage between VIN+ and
Output
To save the PCB space by eliminating the external
open-drain resistor, the SGM8714A-1 provides the
output stage of push-pull. Also, the SGM8714B-1
provides the output of open-drain for the specific
applications.
V
VIN- when VOUT = 0V. This offset voltage is considered into the
influence of the hysteresis which can affect the respond of the
output.
VHYST is used to decrease the sensitivity to the noisy input
voltage (VHYST = 6mV for both SGM8714A-1 and SGM8714B-1).
Figure 2. Hysteresis Transfer Curve
SG Micro Corp
www.sg-micro.com
MARCH 2021
11
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
APPLICATION INFORMATION
The SGM8714A-1 and SGM8714B-1 are single, nano-
power, rail to rail input and small size comparators. The
above advantages make these comparators operated
well in the battery-powered system. Also, the input
rail-to-rail hysteresis can manage the input signal which
is higher than the positive power supply with the
internal hysteresis. The positive feedback should be
taken into account for the applications of higher hysteresis.
The power-budget can be reduced by the structure of
push-pull for SGM8714A-1. The ability of open-drain for
SGM8714A-1 is suitable for the condition of level
shifting or wire-ORing.
threshold (VA1) of high-to-low transition is shown in
Equation 1.
R3
VA1 = VS ×
(1)
R ||R + R
(
)
1
2
3
After VIN reaches the level of VA1 and still increases, the
level of VOUT is in low position. For this situation, as the
output voltage at this case is closed to GND, the
feedback resistance network can be seen as R1 in
series with R2//R3. The threshold (VA2) of low-to-high
transition is shown in Equation 2.
R2 ||R3
VA2 = VS ×
(2)
R1 + (R2 ||R3 )
Inverting Comparator with Hysteresis for
SGM8714A-1
Figure 3 illustrates how SGM8273A-1 works with the
external hysteresis. If the level of VIN is lower than VA,
the VOUT is in high position and it can be seen that VOUT
= VS. For the special distribution of the feedback
resistors, it can be seen as R1//R2 in series with R3. The
The hysteresis caused by the circuit is shown in
Equation 3.
(3)
ΔVA = VA1 - VA2
R2
1MΩ
5V
0V
R1
1MΩ
+VS = 5V
VOUT
R3
1MΩ
VA2
VA1
3.33V
+
VOUT
VA
1.67V
_
VIN
RLOAD
VIN
100kΩ
Output High
+VS
Output Low
+VS
R1
R3
R2
R1
R3
VA1
VA2
R2
Figure 3. SGM8714A-1 in an Inverting Configuration with Hysteresis
SG Micro Corp
www.sg-micro.com
MARCH 2021
12
SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
APPLICATION INFORMATION (continued)
As the increasing of VIN, the output remains at high
position. Moreover, if VIN is lower than VIN2, the output
will go back to low state again. The value of VIN2 is
shown as below:
Non-Inverting Comparator with Hysteresis
for SGM8714A-1
Figure 4 illustrates the non-inverting circuit with
external hysteresis. To explain, the output remains in
low position when the input of the circuit is below the
threshold VIN1. However, the output of the circuit will
change to high position if the input voltage is larger
than VIN1. The value of VIN1 is shown as below:
VREF ×(R1+ R2 )- VS ×R1
V
=
(5)
IN2
R2
The hysteresis caused by the non-inverting circuit is
shown in Equation 6.
VREF
VIN1 = R1 ×
+ VREF
(4)
R1
R2
ΔV = VS ×
(6)
IN
R2
R2
1MΩ
5V
0V
+VS = 5V
R1
VOUT
330kΩ
VIN2
VIN1
VIN
+
VOUT
VA
1.675V 3.325V
VIN
_
VREF = 2.5V
RLOAD
Output High
+VS
Output Low
VIN1
R2
R1
VA = VREF
R1
VA = VREF
R2
VIN2
Figure 4. SGM8714A-1 in a Non-Inverting Configuration with Hysteresis
SG Micro Corp
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SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
APPLICATION INFORMATION (continued)
Detailed Design Procedure
Window Comparator
For the detail of SGM8714B-1, the pins of +VS and -VS
are connected to +3.3V and GND respectively. Set the
value of R1, R2 and R3 equals to 10MΩ so that the two
thresholds of the circuit are equals to +1.1V and +2.2V
respectively. The reason for using large resistors is that
the power consumption can be reduced dramatically.
From the circuit in Figure 5, the output of the sensor is
connected to the non-inverting and inverting inputs of the
circuit respectively. The open-drain configuration of the
outputs is used, and the two outputs are wire-ORed. If the
level of input signal is lower than 1.1V or higher than
2.2V, the output of the circuit is in low state. Also, the
output voltage remains high if the input voltage is within
the range of 1.1V and 2.2V.
The application of window comparator of SGM8714B-1
is shown in Figure 5, and it is used for detecting the
under-voltage or over-voltage situation.
3.3V
R1
RP
+
UV_OV
_
Micro-
Sensor
Controller
R2
+
Application Curve
_
VIN
R3
VTH+ = 2.2V
VTH- = 1.1V
Figure 5. SGM8714B-1 Based Window Comparator
Time (μs)
Design Requirements
VOUT
The parameters of the above circuit are illustrated:
The alert of logic low will be triggered if VIN is lower
than 1.1V.
The alert of logic low will be triggered if VIN is lower
than 2.2V.
The alert happens when the output of the circuit is
low.
Time (μs)
50
100
150
200
Powered by 3.3V DC voltage.
Figure 6. Window Comparator Results
SG Micro Corp
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SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
APPLICATION INFORMATION (continued)
To explain the operation of the circuit, first, it can be
assumed that VOUT is in high position. Then, the
capacitor C1 is charged by VOUT at this stage until the
value of VC reaches the value of VA. The following
equation illustrates the threshold VA1 for the above case:
Square-Wave Oscillator
The following circuit is widely used for the applications
of low-cost timing reference or clock source of the
system.
+VS
+VS
VS ×R3
VA1
=
0
R3 + R1 ||R2
R1
R2
R2
VA1 = VS ×
(7)
R ||R + R
(
)
1
3
2
R3
+
If R1 = R2 = R3, then VA1 = 2VS/3.
VA
VOUT
_
Once the value of VC > VA, the output of the comparator
will be in low position (GND). The following equation
illustrates the threshold VA2:
R4
VC
C1
VS ×(R2 ||R3 )
R1 + R2 ||R3
VA2
=
(8)
Figure 7. Square-Wave Oscillator
If R1 = R2 = R3, then VA2 = VS/3.
Design Requirements
For the circuit in Figure 7, the period of the square
waveform is determined by the time constant R4C1.
There are two parameters that limit the frequency of the
square waveform, which are the propagation delay of
the comparator and the capacitance of the load. For a
specific oscillation frequency, the feedback resistor R4
can be larger when considering to use small capacitor
as the extreme low bias current of the input.
Once VA < VC, the capacitor C1 will discharge until the
value of VC reaches the threshold VA2. As the decreasing
of VC, the output will switch back to high position again.
To calculate the time period of oscillation, it is
considered as the value of VC changes from 2VS/3 to
VS/3, and then goes back to 2VS/3 again, and the result
equals to 2R4C1ln2. To calculate the frequency of
oscillation, the equation is shown as below:
(9)
f = 1/ (2×R4 ×C1 ×ln2)
Detailed Design Procedure
The time constant R4C1 determines the oscillated
frequency of the circuit.
VC1
VS
VS
3
VA1
VA2
2
VS
3
2
t = 0
Time
1
f
Figure 8. Square-Wave Oscillator Timing and Thresholds
SG Micro Corp
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MARCH 2021
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SGM8714A-1
SGM8714B-1
Nano-Power, Small Size,
Low Voltage Comparators
APPLICATION INFORMATION (continued)
Power Supply
Power Supply Decoupling
In general, a single power supply ranged from 1.6V to
5.5V is recommended, the output of comparator is high
(VOUT = +VS) or low (VOUT = GND). Sometimes, bipolar
power supply is also used by SGM8714A-1 and
SGM8714B-1 in level shifting application, for example,
bipolar supply voltages of 2.5V and -2.5V are used for
power comparators. If the bipolar mode of the
comparator is taken into account, the logic high is +VS
and logic low is -VS for this situation.
It is recommended that the value of chosen bypass
capacitor is equal to 100nF to improve the performance
of the SGM8714A-1 and SGM8714B-1 for the situations
of long trace, noisy and high output impedance of the
power supply. Also, if the output of the comparator
needs to drive capacitive load and long trace, the
bypass capacitor is recommended as well. Because of
the high ability of sinking or sourcing output current and
high rise or fall edge rate at the output of the
comparator, a decoupling capacitor connected to the
power supply pin is necessary as the high demand of
the current.
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (MARCH 2021) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
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MARCH 2021
16
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
XTDFN-1×1-6L
D
e
N6
E
L1
k
N1
b
L
BOTTOM VIEW
TOP VIEW
0.20
0.53
1.20
A
A1
A2
0.15
0.35
SIDE VIEW
RECOMMENDED LAND PATTERN (Unit: mm)
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
0.400
0.050
MIN
0.013
0.000
MAX
0.016
0.002
A
A1
A2
D
0.320
0.000
0.100 REF
0.004 REF
0.950
0.950
1.050
1.050
0.037
0.037
0.041
0.041
E
k
0.150 MIN
0.350 TYP
0.006 MIN
0.014 TYP
b
0.120
0.230
0.005
0.009
e
L
0.350
0.350
0.450
0.450
0.014
0.014
0.018
0.018
L1
SG Micro Corp
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TX00072.000
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
XTDFN-1×1-6L
7″
9.5
1.16
1.16
0.50
4.0
2.0
2.0
8.0
Q1
SG Micro Corp
TX10000.000
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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
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
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TX20000.000
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