MICROPAC INDUSTRIES, INC. OPTOELECTRONIC PRODUCTS DIVISION • 725 E. Walnut St., Garland, TX 75040 • (972) 272-3571 • Fax (972) 487-6918

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E-MAIL:

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2 - 8

4N51, 4N52,

HERMETIC, NUMERIC AND HEXIDECIMAL DISPLAYS

(LOW LEVEL DATA)

DATA INPUT

DATA INPUT

(HIGH LEVEL DATA)

INPUT

ENABLE

LH

t

10%

1.5V

90%

1.5V

1.5V

1.5V

1.5V

HOLD

SETUP

FIGURE 1 Timing Diagram of 4N51, 4N52 and 4N54 Series Logic

W

t

t

t

1.5V

GROUND

BLANKING (3)

CONTROL

6

4

ENABLE

1

DP (2)

INPUT

4

2

3

LOGIC

Vcc

8

5

7

PIN NO.

FIGURE 2 Block Diagram of 4N51, 4N52 and 4N54 Series Logic

LED MATRIX

DRIVER

DP

LED MATRIX

MEMORY

LATCH

DC2

DP

DC8

DC4

DC1

DECODER

MATRIX

NUMERAL ONE

580

100

32

FIGURE 3

150

580

150

dp

4

8

1

7

MINUS PLUS

Vcc

PLUS

X

X

X

X

8

4

2

1

BCD DATA (1)

HH

H

H

L

H

H

H

H

L

H

H

L

L

H

H

H

H

L

H

L

H

L

H

H

L

L

H

L

L

L

H

H

H

H

L

L

H

H

L

H

L

H

L

L

L

H

L

H

H

L

L

L

H

L

L

H

L

L

L

L

L

L

L

TRUTH TABLE

4N51/4N52

4N54

F

(BLANK)

E

D

C

B

A

9

9

8

8

7

7

6

6

5

5

4

4

3

3

2

2

1

1

0

0

ON

OFF

LOAD DATA

LATCH DATA

DISPLAY OFF

DISPLAY ON

VDP=H

VDP=L

VE =L

VE =H

VB =H

VB =L

DECIMAL PT. (2)

ENABLE (1)

BLANKING (3)

(BLANK)

.....

(BLANK)

(BLANK)

NOTES:

1. H = Logic High: L = Logic Low. With the

enable input at logic high changes in BCD

input levels or D.P. input have no effect

upon display memory, displayed character,

2. The decmal point, DP, pertains only to

the 4n51 and 4n52 displays.

3. The blanking control, B, pertains only

to the 4n54 hexadecimal display.

Blanking input has no effect upon memory.

or D.P.

PIN

8

7

6

5

4

3

2

1

Minus/Plus

Vcc

Open

Open

DP

Numeral One

Numeral One

Plus

FUNCTION

TRUTH TABLE FOR TYPICAL DRIVING CIRCUIT

BLANK

DECIMAL POINT

1

-

+

H

X

X

LLL

L

X

H

1

X

X

HX

X

2,3

X

4

PIN

X

L

H

X

H

8

CHARACTER

NOTES:

L: Line switching transistor in figure 3 cutoff.

H: Line transistor in figure 3 satuated

X: Don't Care.

TYPICAL DRIVING CIRCUIT

4N53 Over Range Character

4N51, 4N52, 4N54 Logic