4N51, 4N52,
67023 4N53, 4N54
HERMETIC, NUMERIC AND HEXIDECIMAL DISPLAYS
4N51, 4N52, 4N54 Logic
t
t
HOLD
1.5V
SETUP
TRUTH TABLE
DATA INPUT
(LOW LEVEL DATA)
(1)
BCD DATA
X
4N54
4N51/4N52
1.5V
X
X
X
2
8
1
4
L
L
L
L
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
L
L
L
H
L
L
L
H
H
L
DATA INPUT
1.5V
L
L
H
L
1.5V
(HIGH LEVEL DATA)
L
H
H
H
H
L
t
L
L
H
L
LH
ENABLE
INPUT
L
H
H
L
90%
L
H
L
1.5V
1.5V
10%
H
H
H
H
H
H
H
H
L
L
H
L
t
W
L
H
H
L
L
H
L
(BLANK)
FIGURE 1 Timing Diagram of 4N51, 4N52 and 4N54 Series Logic
PIN NO.
H
H
H
H
(BLANK)
.....
L
H
L
H
(BLANK)
(BLANK)
Vcc
ENABLE
7
5
H
H
V
V
V
V
ON
=L
DP
(2)
DECIMAL PT.
=H
=L
OFF
DP
8
1
DC1
DC2
LOGIC
LOAD DATA
LATCH DATA
E
E
B
(1)
ENABLE
LATCH
MEMORY
MATRIX
DECODER
=H
=L
2
3
DC4
DC8
INPUT
DP (2)
V
DISPLAY ON
DISPLAY OFF
(3)
BLANKING
4
DP
V
=H
B
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
DP
BLANKING (3)
CONTROL
4
upon display memory, displayed character,
or D.P.
LED MATRIX
DRIVER
LED MATRIX
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.
GROUND
6
FIGURE 2 Block Diagram of 4N51, 4N52 and 4N54 Series Logic
4N53 Over Range Character
7
Vcc
NUMERAL ONE
MINUS PLUS
PLUS
TRUTH TABLE FOR TYPICAL DRIVING CIRCUIT
FUNCTION
Plus
PIN
1
2
3
4
5
6
7
8
CHARACTER
PIN
1
2,3
X
4
8
Numeral One
Numeral One
dp
+
-
1
H
L
X
X
X
H
L
H
H
X
X
L
X
DP
X
X
L
H
X
Open
Open
Vcc
DECIMAL POINT
BLANK
3
2
4
8
1
L
Minus/Plus
NOTES:
580
100
580
150
150
L: Line switching transistor in figure 3 cutoff.
H: Line transistor in figure 3 satuated
X: Don't Care.
FIGURE 3
TYPICAL DRIVING CIRCUIT
MICROPAC INDUSTRIES, INC. OPTOELECTRONIC PRODUCTS DIVISION • 725 E. Walnut St., Garland, TX 75040 • (972) 272-3571 • Fax (972) 487-6918
www.micropac.com E-MAIL: optosales@micropac.com
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