TI SM72375MMX

SM72375
SM72375 SolarMagic Dual Micropower Rail-To-Rail Input CMOS Comparator with
Open Drain Output
Literature Number: SNIS155C
May 11, 2011
SM72375
SolarMagic Dual Micropower Rail-To-Rail Input CMOS
Comparator with Open Drain Output
General Description
Features
The SM72375 is an ultra low power dual comparator with a
maximum 10 μA/comparator power supply current. It is designed to operate over a wide range of supply voltages, with
a minimum supply voltage of 2.7V.
The common mode voltage range of the SM72375 exceeds
both the positive and negative supply rails, a significant advantage in single supply applications. The open drain output
of the SM72375 allows for wired-OR configurations. The open
drain output also offers the advantage of allowing the output
to be pulled to any voltage rail up to 15V, regardless of the
supply voltage of the SM72375.
The SM72375 is targeted for systems where low power consumption is the critical parameter. Guaranteed operation at
supply voltages of 2.7V and rail-to-rail performance makes
this comparator ideal for battery-powered applications.
■ Renewable Energy Grade
(Typical unless otherwise noted)
■ Low power consumption (max): IS = 10 μA/comp
■ Wide range of supply voltages: 2.7V to 15V
■ Rail-to-Rail Input Common Mode Voltage Range
■ Open drain output
■ Short circuit protection: 40 mA
■ Propagation delay (@VS = 5V, 100 mV overdrive): 5 μs
■ −40°C to 125°C temperature range
Applications
■
■
■
■
Metering systems
RC timers
Alarm and monitoring circuits
Window comparators, multivibrators
Connection Diagram
8-Pin MSOP
30141801
Top View
Ordering Information
Package
8-Pin MSOP
Part Number
Package Marking
Transport Media
SM72375MMX
S375
3500 Units in Tape and Reel
SM72375MM
S375
1000 Units in Tape and Reel
SM72375MME
S375
250 Units in Tape and Reel
© 2011 National Semiconductor Corporation
301418
NSC Drawing
MUA08A
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SM72375 SolarMagic Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain
Output
PRELIMINARY
SM72375
Current at Power Supply Pin,
40 mA
SM72375
Lead Temperature (Soldering, 10 seconds)
260°C
Storage Temperature Range
−65°C to +150°C
Junction Temperature (Note 4)
150°C
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance (Note 2)
1.5 kV
Differential Input Voltage
(V+)+0.3V to (V−)−0.3V
Voltage at Input/Output Pin
(V+)+0.3V to (V−)−0.3V
Supply Voltage (V+–V−)
16V
Current at Input Pin (Note 8)
±5 mA
Current at Output Pin (Note 3, Note
±30 mA
7)
Operating Ratings
(Note 1)
2.7 ≤ VS ≤ 15V
Supply Voltage
– 40°C ≤ TA ≤ +125°C
Temperature Range
Thermal Resistance (θJA)
8-Pin MSOP
172°C/W
2.7V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = 2.7V, V− = 0V, VCM = V+/2. Boldface limits apply at the
temperature extremes.
Symbol
Parameter
Conditions
Min
(Note 6)
Tpy
(Note 5)
Ma x
(Note 6)
Units
3
10
13
mV
VOS
Input Offset Voltage
TCVOS
Input Offset Voltage Temperature
Drift
2.0
Input Offset Voltage Average Drift (Note 10)
3.3
IB
Input Current
0.02
pA
IOS
Input Offset Current
0.01
pA
CMRR
Common Mode Rejection Ratio
75
dB
PSRR
Power Supply Rejection Ratio
±1.35V < VS < ±7.5V
80
dB
AV
Voltage Gain
(By Design)
100
dB
VCM
Input Common-Mode Voltage
Range
CMRR > 55 dB
μV/Month
2.9
2.7
3.0
−0.3
−0.2
0.0
V
VOL
Output Voltage Low
ILOAD = 2.5 mA
0.2
0.3
0.45
V
IS
Supply Current
For Both Comparators
12
20
25
μA
ILeakage
Output Leakage Current
VIN(+) = 0.5V,
VIN(−) = 0V, VO = 15V
500
0.1
nA
5.0V and 15.0V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = 5.0V and 15.0V, V− = 0V, VCM = V+/2. Boldface limits apply
at the temperature extremes.
Symbol
Parameter
Conditions
Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)
3
10
13
VOS
Input Offset Voltage
TCVOS
Input Offset Voltage Temperature
Drift
V+ = 5V
2.0
V+
0.4
Input Offset Voltage Average Drift
V+ = 5V (Note 10)
3.3
V+
4.0
IB
= 15V
= 15V (Note 10)
Units
mV
μV/°C
μV/Month
Input Current
V = 5V
0.04
pA
IOS
Input Offset Current
V+
0.02
pA
CMRR
Common Mode
V+ = 5V
75
dB
Rejection Ratio
V+
82
dB
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= 5V
= 15V
2
Parameter
Min
(Note 6)
Conditions
Typ
(Note 5)
Max
(Note 6)
Units
PSRR
Power Supply Rejection Ratio
±2.5V < VS < ±5V
80
dB
AV
Voltage Gain
(By Design)
100
dB
Input Common-Mode Voltage Range
V+
VCM
= 5.0V
CMRR > 55 dB
5.2
5.0
5.3
−0.3
V+ = 15.0V
CMRR > 55 dB
VOL
Output Voltage Low
15.2
15.0
−0.2
0.0
15.3
−0.3
−0.2
0.0
V+ = 5V
ILOAD = 5 mA
0.2
0.4
0.55
V+ = 15V
ILOAD = 5 mA
02
0.4
0.55
12
20
25
IS
Supply Current
For Both Comparators
(Output Low)
ISC
Short Circuit Current
V+ = 15V, Sinking, VO = 12V
(Note 7)
45
V
V
μA
mA
AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2. Boldface limits apply at the
temperature extreme.
Symbol
Parameter
Min
(Note 6)
Conditions
tRISE
Rise Time
f = 10 kHz, CL = 50 pF,
Overdrive = 10 mV (Note 9)
tFALL
Fall Time
f = 10 kHz, CL = 50 pF,
(Note 9)
tPHL
Propagation Delay
(High to Low)
f = 10 kHz, CL = 50
pF (Note 9)
V+ = 2.7V, f = 10
kHz, CL = 50 pF
(Note 9)
tPLH
Propagation Delay (Low to High)
f = 10 kHz, CL = 50
pF (Note 9)
V+ = 2.7V, f = 10
kHz, CL = 50 pF
(Note 9)
Typ
(Note 5)
Max
(Note 6)
Units
0.3
μs
0.3
μs
10 mV
10
100 mV
4
10 mV
10
100 mV
4
10 mV
10
100 mV
4
10 mV
8
μs
μs
μs
μs
100 mV
4
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the electrical characteristics.
Note 2: Human body model, 1.5 kΩ in series with 100 pF. The output pins of the two comparators (pin 1 and pin 7) have an ESD tolerance of 1.5 kV. All other
pins have an ESD tolerance of 2 kV.
Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature of 150°C. Output currents in excess of ±30 mA over long term may adversely affect reliability.
Note 4: The maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ
(max) – TA)/θJA. All numbers apply for packages soldered directly into a PC board.
Note 5: Typical Values represent the most likely parametric norm.
Note 6: All limits are guaranteed by testing or statistical analysis.
Note 7: Do not short circuit output to V+, when V+ is > 12V or reliability will be adversely affected.
Note 8: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage ratings.
Note 9: CL inlcudes the probe and jig capacitance. The rise time, fall time and propagation delays are measured with a 2V input step.
Note 10: Input offset voltage Average Drift is calculated by dividing the accelerated operating life drift average by the equivalent operational time. The input offset
voltage average drift represents the input offset voltage change at worst-case input conditions.
3
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SM72375
Symbol
SM72375
Typical Performance Characteristics
V+ = 5V, Single Supply, TA = 25°C unless otherwise specified
Input Current vs. Common-Mode Voltage
Input Current vs. Common-Mode Voltage
30141805
30141806
Input Current vs. Common-Mode Voltage
Input Current vs. Temperature
30141808
30141807
ΔVOS vs ΔVCM, VS = 5V
ΔVOS vs ΔVCM, VS = 2.7V
30141809
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30141810
4
SM72375
ΔVOS vs ΔVCM, VS = 15V
Response Time for Overdrive (tPLH)
30141817
30141811
Response Time for Overdrive (tPHL)
Response Time for Overdrive (tPLH)
30141818
30141819
Response Time for Overdrive (tPHL)
Response Time for Overdrive (tPLH)
30141820
30141821
5
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SM72375
Response Time for Overdrive (tPHL)
Response Time vs. Capacitive Load
30141822
30141823
Supply Current vs. Supply Voltage (Output High)
Supply Current vs. Supply Voltage (Output Low)
30141834
30141833
Output Voltage vs. Output Current (Sinking)
Output Voltage vs. Output Current (Sinking)
30141835
30141836
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6
Output Short Circuit Current vs. Supply
30141838
30141837
Output Leakage vs. Output Voltage
30141839
7
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SM72375
Output Voltage vs. Output Current (Sinking)
SM72375
Application Information
1.0 INPUT COMMON-MODE VOLTAGE RANGE
At supply voltages of 2.7V, 5V and 15V, the SM72375 has an
input common-mode voltage range (CMVR) which exceeds
both supplies. As in the case of operational amplifiers, CMVR
is defined by the VOS shift of the comparator over the common-mode range of the device. A common-mode rejection
ratio (CMRR, defined as ΔVOS/ΔVCM) of 75 dB (typical) implies a shift of < 1 mV over the entire common-mode range of
the device. The absolute maximum input voltage at V+ = 5V
is 200 mV beyond either supply rail at room temperature.
30141825
FIGURE 2. Even at Low-Supply Voltage of 2.7V, an Input
Signal which Exceeds the Supply Voltages Produces No
Phase Inversion at the Output
At V+ = 2.7V, propagation delays are tPLH = 4 μs and tPHL = 4
μs with overdrives of 100 mV. Please refer to the performance
curves for more extensive characterization.
3.0 OUTPUT SHORT CIRCUIT CURRENT
The SM72375 has short circuit protection of 40 mA. However,
it is not designed to withstand continuous short circuits, transient voltage or current spikes, or shorts to any voltage beyond the supplies. A resistor is series with the output should
reduce the effect of shorts. For outputs which send signals off
PC boards additional protection devices, such as diodes to
the supply rails, and varistors may be used.
30141824
FIGURE 1. An Input Signal Exceeds the SM72375 Power
Supply Voltages with No Output Phase Inversion
4.0 HYSTERESIS
If the input signal is very noisy, the comparator output might
trip several times as the input signal repeatedly passes
through the threshold. This problem can be addressed by
making use of hysteresis as shown below.
A wide input voltage range means that the comparator can be
used to sense signals close to ground and also to the power
supplies. This is an extremely useful feature in power supply
monitoring circuits.
An input common-mode voltage range that exceeds the supplies, 20 fA input currents (typical), and a high input
impedance makes the SM72375 ideal for sensor applications.
The SM72375 can directly interface to sensors without the
use of amplifiers or bias circuits. In circuits with sensors which
produce outputs in the tens to hundreds of millivolts, the
SM72375 can compare the sensor signal with an appropriately small reference voltage. This reference voltage can be
close to ground or the positive supply rail.
2.0 LOW VOLTAGE OPERATION
Comparators are the common devices by which analog signals interface with digital circuits. The SM72375 has been
designed to operate at supply voltages of 2.7V, without sacrificing performance, to meet the demands of 3V digital systems.
At supply voltages of 2.7V, the common-mode voltage range
extends 200 mV (guaranteed) below the negative supply.
This feature, in addition to the comparator being able to sense
signals near the positive rail, is extremely useful in low voltage
applications.
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30141826
FIGURE 3. Canceling the Effect of Input Capacitance
The capacitor added across the feedback resistor increases
the switching speed and provides more short term hysteresis.
This can result in greater noise immunity for the circuit.
8
SM72375
BI-STABLE MULTIVIBRATOR
Typical Applications
UNIVERSAL LOGIC LEVEL SHIFTER
The output of the SM72375 is the uncommitted drain of the
output NMOS transistor. Many drains can be tied together to
provide an output OR'ing function. An output pullup resistor
can be connected to any available power supply voltage within the permitted power supply range.
30141830
FIGURE 6. Bi-Stable Multivibrator
A bi-stable multivibrator has two stable states. The reference
voltage is set up by the voltage divider of R2 and R3. A pulse
applied to the SET terminal will switch the output of the comparator high. The resistor divider of R1, R4, and R5 now
clamps the non-inverting input to a voltage greater than the
reference voltage. A pulse applied to RESET will now toggle
the output low.
30141827
FIGURE 4. Universal Logic Level Shifter
The two 1 kΩ resistors bias the input to half of the power supply voltage. The pull-up resistor should go to the output logic
supply. Due to its wide operating range, the SM72375 is ideal
for the logic level shifting applications.
ZERO CROSSING DETECTOR
ONE-SHOT MULTIVIBRATOR
30141829
30141828
FIGURE 7. Zero Crossing Detector
FIGURE 5. One-Shot Multivibrator
A voltage divider of R4 and R5 establishes a reference voltage
V1 at the non-inverting input. By making the series resistance
of R1 and R2 equal to R5, the comparator will switch when
VIN = 0. Diode D1 insures that V3 never drops below −0.7V.
The voltage divider of R2 and R3 then prevents V2 from going
below ground. A small amount of hysteresis is setup to ensure
rapid output voltage transitions.
A monostable multivibrator has one stable state in which it
can remain indefinitely. It can be triggered externally to another quasi-stable state. A monostable multivibrator can thus
be used to generate a pulse of desired width.
The desired pulse width is set by adjusting the values of C2
and R4. The resistor divider of R1 and R2 can be used to determine the magnitude of the input trigger pulse. The
SM72375 will change state when V1 < V2. Diode D2 provides
a rapid discharge path for capacitor C2 to reset at the end of
the pulse. The diode also prevents the non-inverting input
from being driven below ground.
9
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SM72375
Figure 8 shows the application of the SM72375 in a square
wave generator circuit. The total hysteresis of the loop is set
by R1, R2 and R3. R4 and R5 provide separate charge and
discharge paths for the capacitor C. The charge path is set
through R4 and D1. So, the pulse width t1 is determined by the
RC time constant of R4 and C. Similarly, the discharge path
for the capacitor is set by R5 and D2. Thus, the time t2 between
the pulses can be changed by varying R5, and the pulse width
can be altered by R4. The frequency of the output can be
changed by varying both R4 and R5.
OSCILLATOR
30141831
FIGURE 8. Square Wave Generator
Time Delay Generator
30141832
FIGURE 9. Time Delay Generator
The circuit shown above provides output signals at a prescribed time interval from a time reference and automatically
resets the output when the input returns to ground. Consider
the case of VIN = 0. The output of comparator 4 is also at
ground. This implies that the outputs of comparators 1, 2, and
3 are also at ground. When an input signal is applied, the output of comparator 4 swings high and C charges exponentially
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through R. This is indicated above. The output voltages of
comparators 1, 2, and 3 swtich to the high state when VC1
rises above the reference voltages VA, VB and VC. A small
amount of hysteresis has been provided to insure fast switching when the RC time constant is chosen to give long delay
times.
10
SM72375
Physical Dimensions inches (millimeters) unless otherwise noted
8-Pin MSOP
NS Package Number MUA08A
11
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SM72375 SolarMagic Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain
Output
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