
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
2 - 8
4N51, 4N52,
67023
4N53, 4N54
HERMETIC, NUMERIC AND HEXIDECIMAL DISPLAYS
4N51, 4N52, 4N54 Logic
(LOW LEVEL DATA)
DATA INPUT
DATA INPUT
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
3
2
FIGURE 3
150
580
150
dp
4
8
1
7
MINUS PLUS
Vcc
PLUS
X
L
X
L
X
L
X
L
8
4
2
1
BCD DATA(1)
H
H
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
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
VE=L
VE=H
VB=L
VDP=L
VB=H
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,
or D.P.
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.
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
L
X
L
X
L
L
X
H
1
X
X
X
H
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