LM239DT datasheet(9/16 Pages) STMICROELECTRONICS

Part #	LM239DT

Description	Low-power quad voltage comparators

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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9 / 16 page

LM139, LM239, LM339

Typical applications

Doc ID 2159 Rev 2

9/16

Figure 17.

Limit comparator

Figure 18.

Crystal-controlled oscillator

10 k

Ω

e

I

~

R

S

2R

S

V

(ref)

high

V

(ref)

low

2N 2222

V

CC

Lamp

1/ 4

LM139

1/ 4

LM139

2R

S

(12 V)

2 k

Ω

200 k

Ω

e

o

V

CC

0

100 k

Ω

200 k

Ω

1/ 4

LM139

0.1

μF

f = 100 kHz

V

CC

= 15 V

Figure 19.

Zero crossing detector

Figure 20.

Comparator with a negative

reference

15 V

5.1 k

Ω

e

o

e

I

~

15 V

1/4

LM139

15 V

5.1 k

Ω

e

o

e

I

~

15 V

5 V

1/ 4

LM139

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