RS8907

Nano-Power, CMOS Input, RRIO,Push-Pull Output Comparator
FEATURES
Low supply current
400nA (TYP) at VS = 1.4V

Low input offset voltage: Vos(max) = ±3mV

Rail-to-Rail Input and output

SUPPLY RANGE: +1.4V to +5.5V



SPECIFIED UP TO +125°C

Micro SIZE PACKAGES: SC70-5, SOT23-5

APPLICATIONSOVERVOLTAGE AND UNDERVOLTAGE
DETECTIONMULTIVIBRATORSOVERCURRENT DETECTION

SYSTEM MONITORINGBATTERY POWERED SYSTEMDESCRIPTION
The RS8907 offers a wide supply range, low quiescentcurrent 400nA (TYP), and rail-to-rail inputs. All of thesefeatures come in industry-standard and extremely
small packages, making this device an excellent choice
for low-voltage and low-power applications for portableelectronics and industrial systems.
Featuring a push-pull output stage, the RS8907 allows
for operation with absolute minimum power
consumption when driving any capacitive or resistiveload.
The devices are ideal for system monitoring, include
tablets, portable medical, smart phones. The RS8907
is specified at the full temperature range of −40°C to+125°C under single power supplies of 1.4V to 5.5V.

Device Information (1)PARTNUMBER
RS8907REV A.5.1

PACKAGEBODY SIZE (NOM)

SOT23-5

1.60mm×2.92mm

SC70-52.10mm×1.25mm(1)

For all available packages, see the orderable addendum at theend of the data sheet.

1 / 13www.run-ic.com

RS8907
Revision History
Note: Page numbers for previous revisions may different from page numbers in the current version.
VERSION

Change Date

A.5

2022/04/15

A.5.1

2024/02/23

Change Item
1. Change Functional Block Diagram
2. Added TAPE AND REEL INFORMATION
3.Change ELECTRICAL CHARACTERISTICS in Page 3@A.4 Version.
4.Change TYPICAL CHARACTERISTICS in Page 4@A.4 Version.
5. Added Detailed Description
Modify packaging naming

2 / 13www.run-ic.com

RS8907
Pin Configuration and Functions (Top View)
RS8907+IN

1

5 V++V- 2--IN 3

4 OUT
SOT23-5/SC70-5

Pin Description
PIN
NAME

I/O (1)DESCRIPTION

SOT23-5/SC70-5+IN

1I

Noninverting input

V-2P

Negative (lowest) power supply

-IN

3I

Inverting inputOUT

4O

Output

V+5P

Positive (highest) power supply(1)I=Input, O=Output, P=Power

3 / 13www.run-ic.com

RS8907
SPECIFICATIONS
Absolute Maximum Ratings
Over operating free-air temperature range (unless otherwise noted) (1)
MINMAX

Supply, Vs=(V+) - (V-)
VoltageCurrent

7

Input pin (IN+, IN-)

(V-)-0.5(V+) +0.5

Signal output pin (2)V(V-)-0.5(V+) +0.5

Signal input pin (IN+, IN-)

-1010mA

Signal output pin (2)-5555mAOutput short-circuit (3)TemperatureUNITContinuous

Operating range, TA-40

125Junction, TJ-40

150Storage, Tstg

-65150°C(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.
(2) Output terminals are diode-clamped to the power-supply rails. Output signals that can swing more than 0.5V beyond the supply rails
should be current-limited to ±55mA or less.
(3) Short-circuit to ground, one amplifier per package.

ESD Ratings
VALUE
V(ESD)

Electrostatic discharge

Human-body model (HBM)±3000

Machine Model (MM)

±400

UNIT
V

Recommended Operating Conditions
Over operating free-air temperature range (unless otherwise noted)
MIN
Supply voltage，Vs= (V+) - (V-）

NOM

MAX

Single-supply

1.4

5.5

Dual-supply

±0.7

±2.75

UNIT
V

Thermal Information:RS8907
RS8907
THERMAL METRIC (1)

5PINS

UNIT

SC70-5RϴJA

Junction-to-ambient thermal resistance

214.7°C/W

RϴJC(top)

Junction-to-case(top) thermal resistance

127.1°C/W

RϴJB

Junction-to-board thermal resistance

60.0°C/W

ѰJT

Junction-to-top characterization parameter

33.4°C/WѰJB

Junction-to-board characterization parameter

59.8°C/W

RϴJC(bot)

Junction-to-case(bottom) thermal resistance

N/A°C/W

4 / 13www.run-ic.com

RS8907
PACKAGE/ORDERING INFORMATION
Orderable
Device
RS8907XF
RS8907XC5-40°C ~125°C

DeviceMarking (1)8907

Tape and Reel,3000-40°C ~125°C

8907

Tape and Reel,3000

Package Type

PinChannel

Op Temp(°C)

SOT23-551SC70-5 (2)51Package Qty

NOTE:(1) There may be additional marking, which relates to the lot trace code information(data code and vendor code)，the logo or theenvironmental category on the device.
(2) Equivalent to SOT353.

5 / 13www.run-ic.com

RS8907
ELECTRICAL CHARACTERISTICS(At TA = +25C, Vs=1.4V to 5.5V, VCM=Vs/2, CL = 15pF, unless otherwise noted.)
RS8907
PARAMETERCONDITIONS
MIN

TYP

MAX

UINTS

5.5

V

1500

nA

POWER SUPPLY
Vs

Operating Voltage Range

IQ

Quiescent Current
Power-Supply Rejection
RatioPSRR

1.4400Vs=1.4V to 5.5V, VCM=(V)+0.5V

70dB

INPUTVos

Vs =1.4V

Input Offset Voltage

VCM =Vs/2ΔVos/ΔT

Input Offset Voltage Drift

VCM =Vs/2, -40°C ≤ TA ≤125°C

IB

Input Bias Current
Common-Mode Voltage
Range
Common-Mode Rejection
Ratio

VCM
CMRR

Vs =5.0V-3161321

TA = –40°C to 125°C(V-)-0.1

Vs=5.5V, VCM =-0.1 to 5.6V

70mV
µV/°C

10pA

(V+)+0.1VdB

OUTPUT
VOH

Output Swing From Upper
Rail

Vs=1.4V, Io=0.1mA7075mV

Vs=5.0V, Io=2.5mA140170mV

VOL

Output Swing From Lower
Rail

Vs=1.4V, Io=-0.1mA

3540mV

Vs=5.0V, Io=-2.5mA

85115mV

Short Circuit Sink Current

Vs=5.0V

42mA

Short Circuit Source Current

Vs=5.0V

38mA

Vs = 5.0 V, Overdrive = 10 mV

1320

Vs = 5.0 V, Overdrive = 100 mV

914

Vs = 2.5 V, Overdrive = 10 mV

1218

Vs = 2.5 V, Overdrive = 100 mV

812Vs = 1.4 V, Overdrive = 10 mV

1320

Vs = 1.4 V, Overdrive = 100 mV

914

Vs = 5.0 V, Overdrive = 10 mV

3050

Vs = 5.0 V, Overdrive = 100 mV

2138

Vs = 2.5 V, Overdrive = 10 mV

2445

Vs = 2.5 V, Overdrive = 100 mV

1530

Vs = 1.4 V, Overdrive = 10 mV

2550

Vs = 1.4 V, Overdrive = 100 mV

1530

ISC

SWITCHING

TPHL

TPLH

Propagation Delay H To L

Propagation Delay L To H

µs

TRRise Time

Overdrive = 100 mV

240

ns

TF

Fall Time

Overdrive = 100 mV260

ns

6 / 13www.run-ic.com

RS8907
TYPICAL CHARACTERISTICS
Response Time vs Input Overdrives
Negative Transition (VS=2.5V)

20
1816141210864203025
20

1050100 200 300 400 500 600 700 800

0100 200 300 400 500 600 700 800

Overdrive(mV)Overdrive(mV)Response Time vs Input Overdrives
Negative Transition (VS=5V)

Response Time vs Input Overdrives
Positive Transition (VS=5V)

20
18161412108642050
45
40
35
30
25
20
15
1050

#1
#2
#3
#4

#1
#2
#3
#4Time(us)Time(us)

#1
#2
#3
#435

15

00 100 200 300 400 500 600 700 800 900 1000

0 100 200 300 400 500 600 700 800 900 1000

Overdrive(mV)Overdrive(mV)

SINK CURRENT vs TEMPERATURE

SOURCE CURRENT vs TEMPERATURE

52485046

Source Current(mA)

Sink Current(mA)Response Time vs Input Overdrives
Positive Transition (VS=2.5V)

40

#1
#2
#3
#4Time(us)Time(us)At TA = +25C, Vs=5V, VCM = VS/2, CL=15pF unless otherwise noted.

48
4644
4240
38

4442403836343632-40 -20

020 40 60 80 100 120 140
Temperature(C)7 / 13-40 -20020 40 60 80 100 120 140
Temperature(C)www.run-ic.com

RS8907
Detailed DescriptionOverview
The RS8907 devices are single-channel, Nano-power comparators with a push-pull output stage. Operatingfrom 1.4V to 5.5V and consuming only 400nA. The push-pull output of the RS8907 supports rail-to-rail output
swing and interfaces with TTL/CMOS logic.

Functional Block Diagram
V+IN+
IN-+

OUT

-V-

Feature Description
The RS8907 devices are Nano-Power comparators that can operate at low voltages. The RS8907 feature arail-to-rail input stage capable of operating up to 100 mV beyond the VCC power supply rail.

Input StageThe RS8907 has rail-to-rail input common-mode voltage range. It can operate at any differential input voltage
within this limit as long as the differential voltage is greater than zero. A differential input of zero volts may resultin oscillation.
The differential input stage of the comparator is a pair of PMOS and NMOS transistors, therefore, no current
flows into the device. The input bias current measured is the leakage current in the MOS transistors and input
protection diodes. This low bias current allows the comparator to interface with a variety of circuitry and devices
with minimal concern about matching the input resistances.

Output StageThe RS8907 has a MOS push-pull rail-to-rail output stage. The push-pull transistor configuration of the output
keeps the total system power consumption to a minimum. The only current consumed by the RS8907 is theless than 1µA supply current and the current going directly into the load. No power is wasted through the pullup
resistor when the output is low. The output stage is specifically designed with dead time between the time when
one transistor is turned off and the other is turned on (break-before-make) to minimize shoot through currents.
The internal logic controls the break-before-make timing of the output transistors. The break-before-make delay
varies with temperature and power condition.

Output Current
Even though the RS8907 uses less than 1µA supply current, the outputs are able to drive very large currents.
The RS8907 can source up to 38mA and can sink up to 42mA, when operated at 5V supply. This large current
handling capability allows driving heavy loads directly.

8 / 13www.run-ic.comRS8907
Application Information
The RS8907 is an ultra-low-power comparator with a typical power supply current of 400nA. It has the best-inclass power supply current versus propagation delay.

Typical Applications
Square Wave Generator
R4C1-VC

VO+
R1

V+VA

R3

V+

R2

0Figure 1. Square Wave Generator Schematic

Design Requirements
A typical application for a comparator is as a square wave oscillator. The circuit in Figure 1 generates a squarewave whose period is set by the RC time constant of the capacitor C1 and resistor R4. The maximum frequency
is limited by the large signal propagation delay of the comparator and by the capacitive loading at the output,
which limits the output slew rate.

Detailed Design Procedure

Figure 2. Square Wave Oscillator

9 / 13www.run-ic.com

RS8907
Typical Applications(continued)
Consider the output of Figure 2 to be high to analyze the circuit. That implies that the inverted input (VC) is lower
than the noninverting input (VA). This causes the C1 to be charged through R4, and the voltage VC increases
until it is equal to the noninverting input. The value of VA at this point is in Equation 1.

VA1

V CC R 2
R 2 R1 R 3………………………………………………………………………………………...…….(1)
If R1 = R2 = R3 then VA1 = 2 VCC/3
At this point the comparator switches pulling down the output to the negative rail. The value of V A at this point,
as shown in Equation 2:

VA2

VCC (R2 R3 )
R1 (R 2 R 3 )………………………………………………………………………………………..…..(2)If R1 = R2 = R3 then VA2 = VCC/3 The capacitor C1 now discharges through R4, and the voltage VC decreases
until it is equal to VA2, at which point the comparator switches again, bringing it back to the initial stage. Thetime period is equal to twice the time it takes to discharge C 1 from 2 VCC/3 to VCC/3, which is given by R4C1 ×ln2. Hence the formula for the frequency is given by Equation 3:
F=1/(2×R4×C1×ln2)…………………………………………………………………………….……(3)Application Curves
Figure 3 shows the simulated results of an oscillator using the following values:
1. R1 = R2 = R3 = R4 = 100 kΩ
2. C1 = 100 pF, CL = 20 pF
3. V+ = 5 V, V– = GND
4. CSTRAY (not shown) from Va to GND = 10 pF
6VOUT

5Va

4321Vc0-1
01020304050

TIME (µ s)Figure 3. Square Wave Oscillator Output Waveform

10 / 13

www.run-ic.com

RS8907
PACKAGE OUTLINE DIMENSIONSSOT23-5
D

1.90
b2.59

E1E
0.99
0.95

0.69
ee1

RECOMMENDED LAND PATTERN (Unit: mm)

0.2A A2cθ
LA1Dimensions In Millimeters

Dimensions In Inches

SymbolMinMaxMinMax

A

1.050

1.250

0.041

0.049

A10.000

0.100

0.000

0.004

A21.050

1.150

0.041

0.045

b0.300

0.500

0.012

0.020

c

0.100

0.200

0.004

0.008

D

2.820

3.020

0.111

0.119

E

1.500

1.700

0.059

0.067

E1

2.650

2.950

0.104

0.116

e0.950(BSC)

0.037(BSC)

e1

1.800

2.000

0.071

0.079

L

0.300

0.600

0.012

0.024

θ

0°

8°

0°

8°

11 / 13

www.run-ic.com

RS8907
SC70-5
D

1.30
b1.9

EE10.75

Pin1Index Area

0.65

0.4ee1RECOMMENDED LAND PATTERN (Unit: mm)

0.2
A A2cθ
L

A1

Dimensions In Millimeters

L1Dimensions In Inches

SymbolMinMax

MinMax

A

0.900

1.100

0.035

0.043

A1

0.000

0.100

0.000

0.004

A2

0.900

1.000

0.035

0.039

b0.150

0.350

0.006

0.014

c

0.080

0.150

0.003

0.006

D

2.000

2.200

0.079

0.087

E

1.150

1.350

0.045

0.053

E1

2.150

2.450

0.085

0.096

e0.650(BSC)

0.026(BSC)

e11.300(BSC)

0.051(BSC)

L

0.260

L1θ

0.460

0.010

0.525
0°

0.018
0.021

8°

12 / 130°8°

www.run-ic.com

RS8907
TAPE AND REEL INFORMATIONREEL DIMENSIONSTAPE DIMENSION

Reel
DiameterReel Width(W1)

DIRECTION OF FEEDNOTE: The picture is only for reference. Please make the object as the standard.

KEY PARAMETER LIST OF TAPE AND REEL
SOT23-5

Reel
Diameter7’’

Reel
Width(mm)9.5

A0(mm)
3.20

B0(mm)
3.20

K0(mm)
1.40

P0(mm)
4.0

P1(mm)
4.0

P2(mm)
2.0W
(mm)
8.0

Pin1
Quadrant
Q3

SC70-57’’

9.5

2.252.55

1.20

4.0

4.0

2.0

8.0

Q3

Package Type

13 / 13

www.run-ic.com