1OUT

1

1INí

2

1IN+

3

GND

4

7

2OUT

6

2INí

5

2IN+

0.12F

Ground

Bypass

Capacitor

Negative Supply or Ground

Positive Supply

0.12F

Ground

Only needed

for dual power

supplies

14

13

12

11

8

9

10

3INí

3IN+

4INí

4IN+

3OUT

4OUT

±1

0

1

2

3

4

5

6

-0.25

0.25

0.75

1.25

1.75

2.25

Time (usec)

5mV OD

20mV OD

100mV OD

C004

±1

0

1

2

3

4

5

6

±0.25 0.00

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

Time (usec)

5mV OD

20mV OD

100mV OD

C006

LM139, LM239, LM339, LM139A

LM239A, LM339A, LM2901, LM2901AV, LM2901V

www.ti.com

SLCS006T – OCTOBER 1979 – REVISED JUNE 2015

9.2.3 Application Curves

Figure 8 and Figure 9 were generated with scope probe parasitic capacitance of 50 pF.

Figure 8. Response Time vs Output Voltage

Figure 9. Response Time vs Output Voltage

(Positive Transition)

(Negative Transition)

10 Power Supply Recommendations

For fast response and comparison applications with noisy or AC inputs, use a bypass capacitor on the supply pin

to reject any variation on the supply voltage. This variation can affect the common-mode range of the comparator

input and create an inaccurate comparison.

11 Layout

11.1 Layout Guidelines

To create an accurate comparator application without hysteresis, maintain a stable power supply with minimized

noise and glitches, which can affect the high level input common-mode voltage range. To achieve this accuracy,

add a bypass capacitor between the supply voltage and ground. Place a bypass capacitor on the positive power

supply and negative supply (if available).

NOTE

If a negative supply is not being used, do not place a capacitor between the GND pin of

the device and system ground.

11.2 Layout Example

Figure 10. LMx39 Layout Example

Copyright © 1979–2015, Texas Instruments Incorporated

Submit Documentation Feedback

13

Product Folder Links: LM139 LM239 LM339 LM139A LM239A LM339A LM2901 LM2901AV LM2901V