Features
■ Wide single supply voltage range or dual
supplies +2 V to +36 V or ±1 V to ±18 V
■ Very low supply current (0.4 mA) independent
of supply voltage (1 mW/comparator at +5 V)
■ Low input bias current: 25 nA typ.
■ Low input offset current: ±5 nA typ.
■ Input common-mode voltage range includes
negative rail
■ Low output saturation voltage:
250 mV typ. (I
■ Differential input voltage range equal to the
= 4 mA)
O
supply voltage
■ TTL, DTL, ECL, MOS, CMOS compatible
outputs
Description
This device consists of two independent lowpower voltage comparators designed specifically
to operate from a single supply over a wide range
of voltages. Operation from split power supplies is
also possible.
LM2903
Low-power dual voltage comparator
N
DIP8
(Plastic package)
D
SO-8
(Plastic micropackage)
P
TSSOP8
(Thin shrink small outline package)
Pin connections (top view)
The device also has a unique characteristic in that
the input common-mode voltage range includes
the negative rail even though operated from a
single power supply voltage.
1 - Output 1
2 - Inverting input 1
3 - Non-inverting input 1
4 - V
CC
-
5 - Non-inverting input 2
6 - Inverting input 2
7 - Output 2
8 - V
CC
February 2012 Doc ID 2470 Rev 9 1/15
+
www.st.com
15
Schematic diagram LM2903
1 Schematic diagram
Figure 1. Schematic diagram (1/2 LM2903)
Non-inverting
input
Inverting
input
3.5 μA
100 μA
3.5 μA 100 μA
2/15 Doc ID 2470 Rev 9
LM2903 Absolute maximum ratings and operating conditions
2 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
V
CC
V
id
V
in
R
thja
R
thjc
T
j
T
stg
ESD
1. Short-circuits from the output to V
maximum output current is approximately 20 mA, independent of the magnitude of V
2. Short-circuits can cause excessive heating and destructive dissipation. Values are typical.
3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
4. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.
5. Charged device model: all pins and the package are charged together to the specified voltage and then
discharged directly to the ground through only one pin. This is done for all pins.
Table 2. Operating conditions
Supply voltage ±18 to 36 V
Differential input voltage ±36 V
Input voltage -0.3 to +36 V
Output short-circuit to ground
(1)
Thermal resistance junction to ambient
DIP8
SO-8
TSSOP8
Thermal resistance junction to case
(2)
DIP8
SO-8
TSSOP8
(2)
Infinite
85
125
120
41
40
37
°C/W
°C/W
Maximum junction temperature +150 °C
Storage temperature range -65 to +150 °C
Human body model (HBM)
Machine model (MM)
CDM: charged device model
CC
(3)
(4)
(5)
+
can cause excessive heating and possible destruction. The
800 V
200 V
1.5 kV
+
.
CC
Symbol Parameter Value Unit
V
T
icm
oper
Common mode input voltage range
≤ T
T
min
amb
≤ T
max
0 to V
0 to V
Operating free-air temperature range -40 to +125 °C
CC
CC
+
-1.5
+
-2
V
Doc ID 2470 Rev 9 3/15
Electrical characteristics LM2903
3 Electrical characteristics
Table 3. V
CC
+
= 5 V, V
Symbol Parameter Min. Typ. Max. Unit
V
A
Input offset voltage
io
I
io
I
ib
≤ T
T
min
Input offset current
≤ T
T
min
Input bias current
T
≤ T
min
Large signal voltage gain
vd
= 15V, RL=15kΩ, Vo=1 to 11V
V
CC
amb
amb
amb
Supply current (all comparators)
I
V
V
I
I
sink
t
CC
id
OL
OH
res
= 5V, no load
V
CC
= 30V, no load
V
CC
Differential input voltage
Low level output voltage (Vid = -1V, I
≤ T
T
min
amb
High level output current (V
≤ T
T
min
amb
≤ T
Output sink current (Vid = -1V, Vo = 1.5V) 6 16 mA
Small signal response time
Large signal response time
rel
TTL input (V
Output signal at 50% of final value
t
ref
Output signal at 95% of final value
1. At output switch point, VO ≈ 1.4 V, RS = 0 Ω with V
2. The direction of the input current is out of the IC due to the PNP input stage. This current is essentially constant,
3. Positive excursions of input voltage may exceed the power supply level. As long as the other voltage remains within the
4. The response time specified is for a 100 mV input step with 5 mV overdrive.
5. Maximum values are guaranteed by design and evaluation.
+
to V
–1.5 V).
CC
independent of the state of the output, so no loading charge exists on the reference of input lines.
common-mode range, the comparator will provide a proper output state. The low input voltage state must not be less than
–0.3 V (or 0.3 V below the negative power supply, if used).
-
= GND, T
≤ T
≤ T
≤ T
≤ T
max
CC
max
max
(2)
max
max
(1)
(3)
amb
=30V, Vid = 1V)
CC =Vo
(4)
(RL = 5.1kΩ to V
(5)
= +1.4 V, RL=5.1kΩ to V
= 25°C (unless otherwise specified)
17
15
550
150
25 250
400
25 200 V/mV
0.4
1
sink
= 4mA)
250 400
0.1
+
)1.3µs
CC
+
)
CC
+
from 5 V to 30 V, and over the full input common-mode range (0 V
CC
2.5
V
700
500
1
CC
1
1
mV
nA
nA
mA
+
V
mV
nA
µA
ns
µs
4/15 Doc ID 2470 Rev 9
LM2903 Electrical characteristics
Figure 2. Supply current vs. supply voltage Figure 3. Input current vs. supply voltage
Figure 4. Output saturation voltage vs.
output current
Figure 5. Response time for various input
overdrives - negative transition
Figure 6. Response time for various input
overdrives - positive transition
Doc ID 2470 Rev 9 5/15
Typical application schematics LM2903
4 Typical application schematics
Figure 7. Basic comparator Figure 8. Driving CMOS
5 V
V
= 5 V
CC
100 kΩ
+V
-V
15 kΩ
+V
-V
(ref)
1/ 2
LM2903
(ref)
(ref)
(ref)
1/2
LM2903
V
O
Figure 9. Driving TTL Figure 10. Low frequency op-amp
5 V
5 V
15 k
1/2
LM2903
100 kΩ
AV = 100
0.5 μF
+V
-V
(ref)
(ref)
1/ 2
LM2903
10 kΩ
~
e
&
&
l
1 kΩ
&
Ω
e
o
Figure 11. Low frequency op-amp with boost Figure 12. Transducer amplifier
5 V
(eo = 0 V for el = 0 V)
15 kΩ
~
e
1 kΩ
1/ 2
LM2903
l
0.5 μF
100 kΩ
AV = 100
2N 2222
e
o
6/15 Doc ID 2470 Rev 9
Magnetic pick-up
10 kΩ
5 V
10 kΩ
1/ 2
LM2903
20 MΩ
3 kΩ
e
o
LM2903 Typical application schematics
Figure 13. Low frequency op- amp with offset
~
e
l
Figure 14. Zero crossing detector (single
adjust
5 V
Offset adjust
R
2
R
S
R
1
1 MΩ
100 kΩ
1 kΩ
1 MΩ
1/ 2
LM2903
100 kΩ
15 kΩ
0.5μF
R1
5 V
2N 2222
e
o
e
l
power supply)
5.1 kΩ
100 kΩ
5.1 kΩ
1N4148
10 kΩ
100 kΩ
1/ 2
LM2903
20 MΩ
5 V
5.1 kΩ
Figure 15. Limit comparator Figure 16. Split-supply applications - zero
crossing detector
V
(12 V)
CC
15 V
V
high
2R
(ref)
e
I
S
R
S
~
1/ 2
LM2903
10 kΩ
Lamp
5.1 kΩ
1/2
e
~
I
LM2903
e
o
V
low
1/2
2R
(ref)
LM2903
S
2N 2222
15 V
Figure 17. Crystal controlled oscillator Figure 18. Comparator with a negative
reference
V
= 15 V
CC
15 V
0.1 μF
200 kΩ
200 kΩ
100 kΩ
1/2
LM2903
f = 100 kHz
2 kΩ
V
CC
0
e
o
e
~
I
1/2
LM2903
5.1 kΩ
e
o
5 V
15 V
Doc ID 2470 Rev 9 7/15
Typical application schematics LM2903
Figure 19. Time delay generator
V
=+15V
C C
V
CC
0
t
Input gating signal
V
CC
V
3
V
V
2
C1
V
1
0
t
t
t
2
1
0
10 kΩ
15 kΩ
200 k
Ω
3 kΩ
10 MΩ
10 kΩ
1/2
V
3
LM2903
3 k
10 kΩ
1/2
LM2903
t
o
A
V
(ref.)
51 kΩ
V
C1
10 kΩ
V
2
10 MΩ
1/2
LM2903
V
CC
V
03
t
t
o
3
Ω
V
CC
V
O2
t
t
o
2
0.001μF
3 k
Ω
10 MΩ
51 kΩ
V
1
t
3
t
t
4
51 kΩ
10 kΩ
1/2
LM2903
V
V
CC
O1
t0t
1
Figure 20. Two-decade high-frequency VCO
V
CC
100 kΩ
Frequency control
voltage input
Vcontrol
10 kΩ
0.1 μF
20 kΩ
50 kΩ
V
=+30V
CC
+250 mV
700 Hz f 100 kHz
V
o
control
8/15 Doc ID 2470 Rev 9
20 kΩ
+50 V
1/ 2
LM2903
500 pF
1/ 2
LM2903
3 kΩ
5.1 kΩ
0.01 μF
V
CC
V
100 kΩ
CC
3 kΩ
1/ 2
LM2903
V
/2
CC
Output 1
Output 2
/2
LM2903 Package information
5 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
Doc ID 2470 Rev 9 9/15
Package information LM2903
5.1 DIP8 package information
Figure 21. DIP8 package mechanical drawing
Table 4. DIP8 package mechanical data
Dimensions
Ref.
Min. Typ. Max. Min. Typ. Max.
A5.330.210
A1 0.38 0.015
A2 2.92 3.30 4.95 0.115 0.130 0.195
b 0.36 0.46 0.56 0.014 0.018 0.022
b2 1.14 1.52 1.78 0.045 0.060 0.070
c 0.20 0.25 0.36 0.008 0.010 0.014
D 9.02 9.27 10.16 0.355 0.365 0.400
E 7.62 7.87 8.26 0.300 0.310 0.325
E1 6.10 6.35 7.11 0.240 0.250 0.280
e 2.54 0.100
eA 7.62 0.300
eB 10.92 0.430
L 2.92 3.30 3.81 0.115 0.130 0.150
Millimeters Inches
10/15 Doc ID 2470 Rev 9
LM2903 Package information
5.2 SO-8 package information
Figure 22. SO-8 package mechanical drawing
Table 5. SO-8 package mechanical data
Dimensions
Ref.
Min. Typ. Max. Min. Typ. Max.
A1.750.069
A1 0.10 0.25 0.004 0.010
A2 1.25 0.049
b 0.28 0.48 0.011 0.019
c 0.17 0.23 0.007 0.010
D 4.80 4.90 5.00 0.189 0.193 0.197
E 5.80 6.00 6.20 0.228 0.236 0.244
E1 3.80 3.90 4.00 0.150 0.154 0.157
e 1.27 0.050
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
L1 1.04 0.040
k1° 8°1° 8°
ccc 0.10 0.004
Millimeters Inches
Doc ID 2470 Rev 9 11/15
Package information LM2903
5.3 TSSOP8 package information
Figure 23. TSSOP8 package mechanical drawing
Table 6. TSSOP8 package mechanical data
Dimensions
Ref.
Min. Typ. Max. Min. Typ. Max.
A1.200.047
A1 0.05 0.15 0.002 0.006
A2 0.80 1.00 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.012
c 0.09 0.20 0.004 0.008
D 2.90 3.00 3.10 0.114 0.118 0.122
E 6.20 6.40 6.60 0.244 0.252 0.260
E1 4.30 4.40 4.50 0.169 0.173 0.177
e 0.65 0.0256
k0° 8°0° 8°
L 0.45 0.60 0.75 0.018 0.024 0.030
L1 1 0.039
aaa 0.10 0.004
Millimeters Inches
12/15 Doc ID 2470 Rev 9
LM2903 Ordering information
6 Ordering information
Table 7. Order codes
Order code
LM2903N
Temperature
range
Package Packing Marking
DIP8 Tube LM2903N
LM2903D/DT SO-8 Tube or tape & reel
2903
LM2903PT TSSOP8 Tape & reel
LM2903YDT
(1)
-40°C to +125°C
SO-8
(Automotive grade)
Tape & reel
2903Y
LM2903YPT
1. Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening
according to AEC Q001 & Q 002 or equivalent.
2. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening
according to AEC Q001 & Q 002 or equivalent are on-going.
(2)
TSSOP8
(Automotive grade)
Tape & reel
Doc ID 2470 Rev 9 13/15
Revision history LM2903
7 Revision history
Table 8. Document revision history
Date Revision Changes
15-Jun-2003 1 Initial release.
2-May-2005 2 PPAP references inserted in the datasheet see table order code p1.
Electrical characteristics table corrected (see Table 3 on page 4).
8-Aug-2005 3
27-Oct-2005 4 PPAP part number added in Table 7: Order codes.
11-May-2007 5
Pin connections diagram moved to cover page.
Lead-free package information added.
ESD tolerance added in Table 1: Absolute maximum ratings on
page 3.
Added R
thja
and R
, and ESD CDM parameters in Ta bl e 1 :
thjc
Absolute maximum ratings.
17-Jan-2008 6
Removed V
from electrical characteristics in Ta b le 3 .
icm
Reformatted package information in Section 5.
Added footnotes for automotive grade parts in Table 7: Order codes.
Corrected SO-8 package mechanical data. Dimension E in drawing
21-Feb-2008 7
was marked H in table.
Corrected revision history (revision 6 is of January 2008, not January
2007).
03-Dec-2009 8 Added pin description on cover page.
16-Feb-2012 9 Removed LM2903YD order code from Ta bl e 7 .
14/15 Doc ID 2470 Rev 9
LM2903
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