1OUT

1

1IN–

2

1IN+

3

GND

4

7

2OUT

6

2IN–

5

2IN+

0.1 F

Ground

Bypass

Capacitor

Negative Supply or Ground

Positive Supply

0.1 F

Ground

Only needed

for dual power

supplies

14

13

12

11

8

9

10

3IN+

3IN–

4IN+

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

10

LM139A-MIL

SLCS161 – JUNE 2017

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Product Folder Links: LM139A-MIL

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Copyright © 2017, Texas Instruments Incorporated

8.2.3 Application Curves

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

Figure 8. Response Time vs Output Voltage

(Positive Transition)

Figure 9. Response Time vs Output Voltage

(Negative Transition)

9 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.

10 Layout

10.1 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.

10.2 Layout Example

Figure 10. LMx39 Layout Example