Truth Table

Equivalent Circuit Block Diagram

Crystal Oscillator External Circuit

No. 5439-5/10

LB1921

Source

→ Sink

F/R = low

R/R = high

IN1

IN2

IN3

IN1

IN2

IN3

1

OUT3

→ OUT2

H

H

L

L

L

H

2

OUT3

→ OUT1

H

L

L

L

H

H

3

OUT2

→ OUT1

H

L

H

L

H

L

4

OUT2

→ OUT3

L

L

H

H

H

L

5

OUT1

→ OUT3

L

H

H

H

L

L

6

OUT1

→ OUT2

L

H

L

H

L

H

External Circuit Constants (reference values)

Note: The crystal used must have a fundamental frequency fo impedance to

3fo impedance ratio of 1:5 or greater.

Xtal (MHz)

C1 (pF)

C2 (pF)

R (k

Ω)

3 to 4

39

82

0.82

4 to 5

39

82

1.0

5 to 7

39

47

1.5

7 to 10

39

27

2.0