LM2903DT - STMicroelectronics

February 2012 Doc ID 2470 Rev 9 1/15

LM2903

Low-power dual voltage comparator

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. (IO = 4 mA)

■Differential input voltage range equal to the

supply voltage

■TTL, DTL, ECL, MOS, CMOS compatible

outputs

Description

This device consists of two independent low-

power voltage comparators designed specifically

to operate from a single supply over a wide range

of voltages. Operation from split power supplies is

also possible.

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.

DIP8

(Plastic package)

SO-8

(Plastic micropackage)

TSSOP8

(Thin shrink small outline package)

Pin connections (top view)

1 - Output 1

2 - Inverting input 1

3 - Non-inverting input 1

4 - VCC-

5 - Non-inverting input 2

6 - Inverting input 2

7 - Output 2

8 - VCC+

www.st.com

Schematic diagram LM2903

2/15 Doc ID 2470 Rev 9

1 Schematic diagram

Figure 1. Schematic diagram (1/2 LM2903)

3.5 μA100 μA3.5 μA 100 μA

Non-inverting

input

Inverting

input

LM2903 Absolute maximum ratings and operating conditions

Doc ID 2470 Rev 9 3/15

2 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

VCC Supply voltage ±18 to 36 V

Vid Differential input voltage ±36 V

Vin Input voltage -0.3 to +36 V

Output short-circuit to ground (1)

1. Short-circuits from the output to VCC+ can cause excessive heating and possible destruction. The

maximum output current is approximately 20 mA, independent of the magnitude of VCC+.

Infinite

Rthja

Thermal resistance junction to ambient(2)

DIP8

SO-8

TSSOP8

2. Short-circuits can cause excessive heating and destructive dissipation. Values are typical.

125

120

°C/W

Rthjc

Thermal resistance junction to case(2)

DIP8

SO-8

TSSOP8

°C/W

TjMaximum junction temperature +150 °C

Tstg Storage temperature range -65 to +150 °C

ESD

Human body model (HBM)(3)

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.

800 V

Machine model (MM)(4)

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.

200 V

CDM: charged device model(5)

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.

1.5 kV

Table 2. Operating conditions

Symbol Parameter Value Unit

Vicm

Common mode input voltage range

Tmin ≤ T

amb ≤ T

max

0 to VCC+ -1.5

0 to VCC+ -2 V

Toper Operating free-air temperature range -40 to +125 °C

Electrical characteristics LM2903

4/15 Doc ID 2470 Rev 9

3 Electrical characteristics

Table 3. VCC+ = 5 V, VCC- = GND, Tamb = 25°C (unless otherwise specified)

Symbol Parameter Min. Typ. Max. Unit

Vio

Input offset voltage (1)

Tmin ≤ T

amb ≤ T

max

15 mV

Iio

Input offset current

Tmin ≤ T

amb ≤ T

max

550

150 nA

Iib

Input bias current (2)

Tmin ≤ T

amb ≤ T

max

25 250

400 nA

Avd

Large signal voltage gain

VCC = 15V, RL=15kΩ, Vo=1 to 11V 25 200 V/mV

ICC

Supply current (all comparators)

VCC = 5V, no load

VCC = 30V, no load

0.4

2.5

Vid Differential input voltage (3) VCC+V

VOL

Low level output voltage (Vid = -1V, Isink = 4mA)

Tmin ≤ T

amb ≤ T

max

250 400

700 mV

IOH

High level output current (VCC =Vo =30V, Vid = 1V)

Tmin ≤ T

amb ≤ T

max

0.1

µA

Isink Output sink current (Vid = -1V, Vo = 1.5V) 6 16 mA

tres Small signal response time (4) (RL = 5.1kΩ to VCC+)1.3µs

trel

Large signal response time (5)

TTL input (Vref = +1.4 V, RL=5.1kΩ to VCC+)

Output signal at 50% of final value

Output signal at 95% of final value

500

µs

1. At output switch point, VO ≈ 1.4 V, RS = 0 Ω with VCC+ from 5 V to 30 V, and over the full input common-mode range (0 V

to VCC+ –1.5 V).

2. The direction of the input current is out of the IC due to the PNP input stage. This current is essentially constant,

independent of the state of the output, so no loading charge exists on the reference of input lines.

3. Positive excursions of input voltage may exceed the power supply level. As long as the other voltage remains within the

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).

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.

LM2903 Electrical characteristics

Doc ID 2470 Rev 9 5/15

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

Typical application schematics LM2903

6/15 Doc ID 2470 Rev 9

4 Typical application schematics

Figure 7. Basic comparator Figure 8. Driving CMOS

VCC = 5 V

15 kΩ

+V(ref)

1/2

LM2903

-V(ref)

5 V

100 kΩ

1/ 2

LM2903

+V(ref)

-V(ref)

Figure 9. Driving TTL Figure 10. Low frequency op-amp

5 V

10 kΩ

+V(ref)

1/ 2

LM2903

-V(ref)

5 V

15 k

0.5

100 kΩ

1 kΩ

1/2

LM2903

AV = 100

Figure 11. Low frequency op-amp with boost Figure 12. Transducer amplifier

5 V

15 kΩ

0.5 μF

100 kΩ

1 kΩ

2N 2222

(eo = 0 V for el = 0 V)

1/ 2

LM2903

AV = 100

5 V

10 kΩ

20 MΩ

3 kΩ

Magnetic pick-up

10 kΩ

1/ 2

LM2903

LM2903 Typical application schematics

Doc ID 2470 Rev 9 7/15

Figure 13. Low frequency op- amp with offset

adjust

Figure 14. Zero crossing detector (single

power supply)

el~2N 2222

5 V

100 kΩ

1 kΩ

5 V

1 MΩ

100 kΩ

1 MΩ

Offset adjust

RSR115 kΩ

0.5 μF

1/ 2

LM2903

100 kΩ

10 kΩ

20 MΩ

5 V

1N4148

5.1 kΩ

100 kΩ

1/ 2

LM2903

5.1 kΩ

Figure 15. Limit comparator Figure 16. Split-supply applications - zero

crossing detector

10 kΩ

(ref)

high

(ref)

low

2N 2222

Lamp

1/ 2

LM2903

1/2

LM2903

(12 V)

15 V

5.1 kΩ

eI~

15 V

1/2

LM2903

Figure 17. Crystal controlled oscillator Figure 18. Comparator with a negative

reference

2 kΩ

200 kΩ

100 kΩ

200 kΩ

1/2

LM2903

0.1 μF

f = 100 kHz

= 15 V

15 V

5.1 kΩ

eI~

15 V

5 V

1/2

LM2903

Typical application schematics LM2903

8/15 Doc ID 2470 Rev 9

Figure 19. Time delay generator

Figure 20. Two-decade high-frequency VCO

VCC

V(ref.)

10 kΩ

1/2

15 kΩ

200 k

3 kΩ

3 k

10 MΩ

VO2

V03

51 kΩ

0.001

VCC

VC1

tt3

VCC

VCC=+15V

1/2

LM2903

1/2

10 kΩ

10 MΩ

51 kΩ

Input gating signal

LM2903

VCC VCC

100 kΩ

3 kΩ

5.1 kΩ

VCC /2

0.01 μF

500 pF

100 kΩ

0.1 μF

20 kΩ

50 kΩ

=+30V

+250 mV Vcontrol +50 V

700 Hz f 100 kHz

20 kΩ

3 kΩ

1/ 2

LM2903

1/ 2

LM2903

1/ 2

LM2903

Output 1

Output 2

VCC

Frequency control

voltage input

Vcontrol

10 kΩ

LM2903 Package information

Doc ID 2470 Rev 9 9/15

5 Package information

In order to meet environmental requirements, ST offers these devices in different grades of

ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®

specifications, grade definitions and product status are available at: www.st.com.

ECOPACK® is an ST trademark.

Package information LM2903

10/15 Doc ID 2470 Rev 9

5.1 DIP8 package information

Figure 21. DIP8 package mechanical drawing

Table 4. DIP8 package mechanical data

Ref.

Dimensions

Millimeters Inches

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

LM2903 Package information

Doc ID 2470 Rev 9 11/15

5.2 SO-8 package information

Figure 22. SO-8 package mechanical drawing

Table 5. SO-8 package mechanical data

Ref.

Dimensions

Millimeters Inches

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

Package information LM2903

12/15 Doc ID 2470 Rev 9

5.3 TSSOP8 package information

Figure 23. TSSOP8 package mechanical drawing

Table 6. TSSOP8 package mechanical data

Ref.

Dimensions

Millimeters Inches

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

LM2903 Ordering information

Doc ID 2470 Rev 9 13/15

6 Ordering information

Table 7. Order codes

Order code Temperature

range Package Packing Marking

LM2903N

-40°C to +125°C

DIP8 Tube LM2903N

LM2903D/DT SO-8 Tube or tape & reel 2903

LM2903PT TSSOP8 Tape & reel

LM2903YDT(1)

1. Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening

according to AEC Q001 & Q 002 or equivalent.

SO-8

(Automotive grade) Tape & reel

2903Y

LM2903YPT(2)

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.

TSSOP8

(Automotive grade) Tape & reel

Revision history LM2903
14/15 Doc ID 2470 Rev 9
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.
8-Aug-2005 3
Electrical characteristics table corrected (see Table 3 on page 4). 
Pin connections diagram moved to cover page.
Lead-free package information added.
27-Oct-2005 4 PPAP part number added in Table 7: Order codes.
11-May-2007 5 ESD tolerance added in Table 1: Absolute maximum ratings on 
page 3.
17-Jan-2008 6
Added Rthja and Rthjc, and ESD CDM parameters in Ta bl e 1:  
Absolute maximum ratings.
Removed Vicm from electrical characteristics in Table 3.
Reformatted package information in Section 5.
Added footnotes for automotive grade parts in Table 7: Order codes.
21-Feb-2008 7
Corrected SO-8 package mechanical data. Dimension E in drawing 
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 b l e 7 .

LM2903

Doc ID 2470 Rev 9 15/15

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