Datasheet LM311N, LM311DR2, LM311D, LM211DR2, LM211D Datasheet (Motorola)

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Order this document by LM311/D

 

The ability to operate from a single power supply of 5.0 V to 30 V or ±15 V split supplies, as commonly used with operational amplifiers, makes the LM211/LM311 a truly versatile comparator. Moreover, the inputs of the device can be isolated from system ground while the output can drive loads referenced either to ground, the VCC or the VEE supply . This flexibility makes it possible to drive DTL, RTL, TTL, or MOS logic. The output can also switch voltages to 50 V at currents to 50 mA. Thus the LM21 1/LM31 1 can be used to drive relays, lamps or solenoids.

T ypical Comparator Design Configurations

Split Power Supply with Offset Balance

V 8

Output

Inputs

Load Referred to Negative Supply

Inputs

3.0 k

5.0 k 5

Inputs

–

Ground–Referred Load

Inputs

–

Input polarity is reversed when

Gnd pin is used as an output.

Load Referred to Positive Supply Strobe Capability

Inputs

–

Single Supply

Input polarity is reversed when

Gnd pin is used as an output.

–

1.0 k

Output

TTL Strobe

HIGH PERFORMANCE

VOLTAGE COMPARATORS

SEMICONDUCTOR

TECHNICAL DATA

N SUFFIX

PLASTIC PACKAGE

CASE 626

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

PIN CONNECTIONS

Output

Balance/Strobe

Balance

Inputs

Device

LM211D LM311D

LM311N

Gnd

–

(Top View)

ORDERING INFORMATION

Operating

Temperature Range

TA = 25° to +85°C

TA = 0° to +70°C

Package

SO–8 SO–8

Plastic DIP

MOTOROLA ANALOG IC DEVICE DATA

 Motorola, Inc. 1996 Rev 5

Page 2

LM311 LM211

MAXIMUM RATINGS (T

= +25°C, unless otherwise noted.)

Rating Symbol LM211 LM311 Unit

Total Supply Voltage VCC +VEE 36 36 Vdc Output to Negative Supply Voltage VO –V Ground to Negative Supply Voltage V

Input Differential Voltage V Input Voltage (Note 2) V

50 40 Vdc 30 30 Vdc

±30 ±30 Vdc ±15 ±15 Vdc

Voltage at Strobe Pin – VCC to VCC–5 VCC to VCC–5 Vdc Power Dissipation and Thermal Characteristics

Plastic DIP P

Derate Above TA = +25°C 1/θ Operating Ambient Temperature Range T Operating Junction Temperature T Storage Temperature Range T

ELECTRICAL CHARACTERISTICS (V

= +15 V, VEE = –15 V, TA = 25°C, unless otherwise noted [Note 1].)

J(max)

stg

–25 to +85 0 to +70 °C

+150 +150 °C

–65 to +150 –65 to +150 °C

625 mW

5.0 mW/°C

LM211 LM311

Characteristic Symbol

Input Offset Voltage (Note 3) V

Min Typ Max Min Typ Max

RS ≤ 50 kΩ, TA = +25°C – 0.7 3.0 – 2.0 7.5 RS ≤ 50 kΩ, T

Input Offset Current (Note 3) TA = +25°C I

≤ TA ≤ T

low

Input Bias Current TA = +25°C I

≤ TA ≤ T

low

Voltage Gain A

≤ TA ≤ T

low

* – – 20 – – 70

high

* – – 150 – – 300

high

* – – 4.0 – – 10

high

– 1.7 10 – 1.7 50 nA

– 45 100 – 45 250 nA

40 200 – 40 200 – V/mV Response Time (Note 4) – 200 – – 200 – ns Saturation Voltage V

VID ≤ –5.0 mV, IO = 50 mA, TA = 25°C – 0.75 1.5 – – – VID ≤–10 mV , IO = 50 mA, TA = 25°C – – – – 0.75 1.5

VCC ≥ 4.5 V, VEE = 0, T

VID 6≤6.0 mV , I VID 6≤10 mV , I

sink

Strobe ”On” Current (Note 5) I

≤ TA ≤ T

low

≤ 8.0 mA

high

– 0.23 0.4 – – – – – – – 0.23 0.4

– 3.0 – – 3.0 – mA

Output Leakage Current

VID ≥ 5.0 mV, VO= 35 V, TA = 25°C, I VID

≥ 10 mV , VO

VID

≥ 5.0 mV , VO

Input Voltage Range (T

= 35 V, TA = 25°C, I

= 35 V, T

low

≤ TA ≤ T

low

≤ TA ≤ T

high

Positive Supply Current I Negative Supply Current I

* T

= –25°C for LM211 T

low

= 0°C for LM311 = +70°C for LM311

NOTES: 1. Of fset voltage, of fset current and bias current specifications apply for a supply voltage range from a single 5.0 V supply up to ±15V supplies.

2.This rating applies for ±15 V supplies. The positive input voltage limit is 30 V above the negative supply. The negative input voltage limit is equal to the negative supply voltage or 30 V below the positive supply , whichever is less.

3.The offset voltages and offset currents given are the maximum values required to drive the output within a volt of either supply with a 1.0 mA load. Thus, these parameters define an error band and take into account the ”worst case” effects of voltage gain and input impedance.

4.The response time specified is for a 100 mV input step with 5.0 mV overdrive.

5.Do not short the strobe pin to ground; it should be current driven at 3.0 mA to 5.0 mA.

= 3.0 mA – 0.2 10 – – – nA

strobe

= 3.0 mA – – – – 0.2 50 nA

strobe

* – 0.1 0.5 – – – µA

high

*) V

high

ICR

= +85°C for LM211

–14.5 –14.7 to

13.8

+13.0 –14.5 –14.7 to

13.8 – +2.4 +6.0 – +2.4 +7.5 mA – –1.3 –5.0 – –1.3 –5.0 mA

+13.0 V

Unit

MOTOROLA ANALOG IC DEVICE DATA

Page 3

Balance

Balance/Strobe

Inputs

LM311 LM211

Figure 1. Circuit Schematic

Output

Gnd

1.3 k 3005

300

1.3 k

3.7 k

100

3.7 k

730

340

800800

3.0 k

5.0 k

200

600

250

1.3 k

300

900

800

5.4 k

Figure 2. Input Bias Current

versus T emperature

140

120

100

, INPUT BIAS CURRENT (nA)

0 –55 –25 0 25 50 75 100 125

Normal

TA, TEMPERATURE (°C) TA, TEMPERATURE (°C)

Pins 5 & 6 Tied

to V

VCC = +15 V VEE = –15 V

Figure 4. Input Bias Current versus

Differential Input Voltage

140 120 100

VCC = +15 V VEE = –15 V

TA = +25

Figure 3. Input Offset Current

versus T emperature

5.0 VCC = +15 V

4.0

3.0

2.0

1.0

, INPUT OFFSET CURRENT (nA)COMMON MODE LIMITS (V)

–55 –25 0 25 50 75 100 125

Pins 5 & 6 Tied

to V

Normal

VEE = –15 V

Figure 5. Common Mode Limits

versus T emperature

–0.5 –1.0

–1.5

Referred to Supply Voltages

60 40

, INPUT BIAS CURRENT (nA)

–16 –12 –8.0 –4.0 0 4.0 8.0 12 16

DIFFERENTIAL INPUT VOLTAGE (V)

MOTOROLA ANALOG IC DEVICE DATA

0.4

0.2

–55 –25 0 25 50 75 100 125

TA, TEMPERATURE (°C)

Page 4

LM311 LM211

5.0

4.0 20 mV

3.0

, OUTPUT VOL TAGE (V)

2.0

1.0

100

INPUT VOLTAGE (mV)

, V

0 0.1 0.2 0.3 0.4 0.5 0.6

15 10

20 mV 5.0 mV

5.0

, OUTPUT VOL TAGE (V)

–5.0

–10 –15

–50

–100

INPUT VOLTAGE (mV)

, V

0 1.0 2.0

Figure 6. Response Time for

Various Input Overdrives

5.0 mV

)

2.0 mV

VCC = +15 V VEE = –15 V TA = +25

, RESPONSE TIME (µs) t

TLH

Figure 8. Response Time for

Various Input Overdrives

2.0 mV

, RESPONSE TIME (

TLH

s) t

+5.0 V

500

Ω

* )

2.0 k

VCC = +15 V VEE = –15 V

TA = +25

Figure 7. Response Time for

Various Input Overdrives

+5.0 V

Ω

500

, OUTPUT VOL TAGE (V)

5.0

4.0

3.0

2.0

1.0

20 mV

5.0 mV

2.0 mV

* )

–50

VCC = +15 V VEE = –15 V

TA = +25

–100

INPUT VOLTAGE (mV)

0 0.1 0.2 0.3 0.4 0.5 0.6

, RESPONSE TIME (µs)

THL

Figure 9. Response Time for

Various Input Overdrives

15 10

5.0 0

, OUTPUT VOL TAGE (V)

–5.0

–10 –15

20 mV

5.0 mV

2.0 mV

100

INPUT VOLTAGE (mV)

0 1.0 2.0

, RESPONSE TIME (µs)

THL

* )

VCC = +15 V VEE = –15 V

TA = +25

2.0 k

Figure 10. Output Short Circuit Current

Characteristics and Power Dissipation

150

125

100

Power Dissipation

OUTPUT SHORT CIRCUIT CURRENT (mA)

0 5.0 10 15

VO, OUTPUT VOLTAGE (V) IO, OUTPUT CURRENT (mA)

TA = +25°C

Short Circuit Current

0.90

0.75

0.60

0.45

0.30

0.15

, SATURATION VOLTAGE (V)

, POWER DISSIPATION (W)

Figure 11. Output Saturation Voltage

versus Output Current

0.90

0.75

0.60 TA = –55°C

0.45

0.30

TA = +25°C

0.15

TA = +125°C

0 8.0 16 24 32 40 48 56

MOTOROLA ANALOG IC DEVICE DATA

Page 5

LM311 LM211

Figure 12. Output Leakage Current

versus T emperature

100

VCC = +15 V

1.0

0.1

OUTPUT LEAKAGE CURRENT (mA)

0.01

VEE = –15 V

Output VO = +50 V (LM11/211 only)

25 45 65 85 105 125

TA, TEMPERATURE (°C)

Figure 14. Power Supply Current

3.0

2.6 Postive Supply – Output Low

2.2

3.6

3.0

2.4

1.8

1.2

0.6

POWER SUPPLY CURRENT (mA)

0 5.0 10 15 20 25 30

versus T emperature

Figure 13. Power Supply Current

versus Supply V oltage

TA = +25°C

Positive Supply – Output Low

Positive and Negative Power Supply – Output H igh

VCC–VEE, POWER SUPPLY VOLTAGE (V)

VCC = +15 V VEE = –15 V

1.8

SUPPLY CURRENT (mA)

1.4

1.0

–55 –25 0 25 50 75 100 125

Figure 15. Improved Method of Adding

Hysteresis Without Applying Positive

Feedback to the Inputs

33 k

LM311

–

5.0 k C1

0.002

Input

0.1

Positive and Negative Supply – Output High

TA, TEMPERATURE (

APPLICATIONS INFORMATION

Figure 16. Conventional T echnique

+15 V

823.0 k

0.1

4.7 k 100

Input

Output

100

for Adding Hysteresis

LM311

–

5.0 k

3.0 k

+15 V

4.7 k

Output

0.1 µF

–15 V

MOTOROLA ANALOG IC DEVICE DATA

1.0 M –15 V

0.1 µF

510 k

Page 6

LM311 LM211

TECHNIQUES FOR AVOIDING OSCILLATIONS IN COMPARATOR APPLICATIONS

When a high speed comparator such as the LM21 1 is used with high speed input signals and low source impedances, the output response will normally be fast and stable, providing the power supplies have been bypassed (with 0.1 µF disc capacitors), and that the output signal is routed well away from the inputs (Pins 2 and 3) and also away from Pins 5 and 6.

However, when the input signal is a voltage ramp or a slow sine wave, or if the signal source impedance is high (1.0 kΩ to 100 kΩ), the comparator may burst into oscillation near the crossing–point. This is due to the high gain and wide bandwidth of comparators like the LM211 series. To avoid oscillation or instability in such a usage, several precautions are recommended, as shown in Figure 15.

The trim pins (Pins 5 and 6) act as unwanted auxiliary inputs. If these pins are not connected to a trim–pot, they should be shorted together. If they are connected to a trim–pot, a 0.01 µF capacitor (C1) between Pins 5 and 6 will minimize the susceptibility to AC coupling. A smaller capacitor is used if Pin 5 is used for positive feedback as in Figure 15. For the fastest response time, tie both balance pins to VCC.

Certain sources will produce a cleaner comparator output waveform if a 100 pF to 1000 pF capacitor (C2) is connected directly across the input pins. When the signal source is applied through a resistive network, R1, it is usually advantageous to choose R2 of the same value, both for DC and for dynamic (AC) considerations. Carbon, tin–oxide, and metal–film resistors have all been used with good results in comparator input circuitry, but inductive wirewound resistors should be avoided.

When comparator circuits use input resistors (e.g., summing resistors), their value and placement are particularly important. In all cases the body of the resistor should be close to the device or socket. In other words, there should be a very short lead length or printed–circuit foil run between comparator and resistor to radiate or pick up signals. The same applies to capacitors, pots, etc. For example, if R1 = 10 kΩ, as little as 5 inches of lead between the resistors and the input pins can result in oscillations that are very hard to dampen. Twisting these input leads tightly is the best alternative to placing resistors close to the comparator.

Since feedback to almost any pin of a comparator can result in oscillation, the printed–circuit layout should be engineered thoughtfully. Preferably there should be a groundplane under the LM211 circuitry (e.g., one side of a double layer printed circuit board). Ground, positive supply or negative supply foil should extend between the output and the inputs to act as a guard. The foil connections for the inputs should be as small and compact as possible, and should be essentially surrounded by ground foil on all sides to guard against capacitive coupling from any fast high–level signals (such as the output). If Pins 5 and 6 are not used, they should be shorted together. If they are connected to a trim–pot, the trim–pot should be located no more than a few inches away from the LM21 1, and a 0.01 µF capacitor should be installed across Pins 5 and 6. If this capacitor cannot be used, a shielding printed–circuit foil may be advisable between Pins 6 and 7. The power supply bypass capacitors should be located within a couple inches of the LM21 1.

A standard procedure is to add hysteresis to a comparator to prevent oscillation, and to avoid excessive noise on the output. In the circuit of Figure 16, the feedback resistor of 510 kΩ from the output to the positive input will cause about

3.0 mV of hysteresis. However, if R2 is larger than 100 Ω, such as 50 kΩ, it would not be practical to simply increase the value of the positive feedback resistor proportionally above 510 kΩ to maintain the same amount of hysteresis.

When both inputs of the LM211 are connected to active signals, or if a high–impedance signal is driving the positive input of the LM211 so that positive feedback would be disruptive, the circuit of Figure 15 is ideal. The positive feedback is applied to Pin 5 (one of the offset adjustment pins). This will be sufficient to cause 1.0 mV to 2.0 mV hysteresis and sharp transitions with input triangle waves from a few Hz to hundreds of kHz. The positive–feedback signal across the 82 Ω resistor swings 240 mV below the positive supply. This signal is centered around the nominal voltage at Pin 5, so this feedback does not add to the offset voltage of the comparator. As much as 8.0 mV of offset voltage can be trimmed out, using the 5.0 kΩ pot and 3.0 kΩ resistor as shown.

Figure 17. Zero–Crossing Detector

Driving CMOS Logic

VCC = +15 V

Balance Adjust

Balance

Input

Inputs

3.0 k

5.0 k

LM311

VEE = –15 V

Gnd

10 k

Output to CMOS Logic

Figure 18. Relay Driver with Strobe Capability

2N2222

or Equiv

CC2

*D1

*Zener Diode D1 protects the comparator from inductive kickback and voltage transients on the V

CC2

supply line.

Inputs

Gnd

LM311

CC1

CC Output

Balance/Strobe

1.0 k

TTL

Strobe

MOTOROLA ANALOG IC DEVICE DATA

Page 7

NOTE 2

–T–

SEATING PLANE

OUTLINE DIMENSIONS

–B–

–A–

0.13 (0.005) B

LM311 LM211

N SUFFIX

PLASTIC PACKAGE

CASE 626–05

ISSUE K

NOTES:

1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL.

2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS).

3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.

DIM MIN MAX MIN MAX

A 9.40 10.16 0.370 0.400 B 6.10 6.60 0.240 0.260 C 3.94 4.45 0.155 0.175 D 0.38 0.51 0.015 0.020 F 1.02 1.78 0.040 0.070

G 2.54 BSC 0.100 BSC

H 0.76 1.27 0.030 0.050 J 0.20 0.30 0.008 0.012 K 2.92 3.43 0.115 0.135 L 7.62 BSC 0.300 BSC

M ––– 10 ––– 10

N 0.76 1.01 0.030 0.040

INCHESMILLIMETERS

D SUFFIX

PLASTIC PACKAGE

CASE 751–05

(SO–8)

ISSUE R

0.25MB

X 45

SEATING PLANE

0.10

A0.25MCB

NOTES:

1. DIMENSIONING AND TOLERANCING PER ASME

Y14.5M, 1994.

2. DIMENSIONS ARE IN MILLIMETERS.

3. DIMENSION D AND E DO NOT INCLUDE MOLD

PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.

5. DIMENSION B DOES NOT INCLUDE MOLD

PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION.

MILLIMETERS

DIM MIN MAX

A 1.35 1.75

A1 0.10 0.25

B 0.35 0.49 C 0.18 0.25 D 4.80 5.00 E

3.80 4.00

1.27 BSCe

H 5.80 6.20 h

0.25 0.50

L 0.40 1.25

0 7

MOTOROLA ANALOG IC DEVICE DATA

Page 8

LM311 LM211

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◊

MOTOROLA ANALOG IC DEVICE DATA

LM311/D

*LM311/D*