DIONICS, INC.
65 Rushmore Street
Westbury, NY 11590
Phone: (516) 997-7474
Fax: (516) 997-7479
Website: www.dionics-usa.com
DI-8884A High Voltage Cathode Decoder/Driver
Direct Replacement for National DM-8884A
General Description:
The DI-8884A is designed to decode four
lines of BCD input and drive seven segment
digits of gas-filled readout displays. Two
separate inputs are provided for driving the
decimal point and comma cathodes.
All outputs consist of switchable and
programmable current sinks, which provide
constant current to the tube cathodes, even
with high tube anode supply tolerance.
Output currents may be varied over the 0.2
to 1.2 mA range for multiplex operation.
The output current is adjusted by connecting
an external program resistor (R
p
) from V
cc
to
the program input.
Features:
Reliable Dielectric Isolation Process
Current Sink Outputs
High Output Breakdown Voltage
Low Input Load Current
Intended For Multiplex Operation
Replacement For National DM-8884A
Standard 18-pin DIP Package
Package Layout:
0.900
Truth Table
Function
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
*Decimal Point
*Comma
Decimal Point
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
Comma
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0.025
0.070
D
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
X
X
C
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
X
X
B
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
X
X
A
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
X
X
a
0
1
0
0
1
0
0
0
0
0
1
1
0
0
1
1
X
X
b
0
0
0
0
0
1
1
0
0
0
1
1
0
1
1
1
X
X
c
0
0
1
0
0
0
0
0
0
0
0
0
1
1
1
1
X
X
d
0
1
0
0
1
0
0
1
0
0
0
0
1
0
1
1
X
X
e
0
1
0
1
1
1
0
1
0
1
0
0
1
0
1
1
X
X
f
0
1
1
1
0
0
0
1
0
0
1
1
0
0
1
1
X
X
g
Display
1
1
0
0
0
0
0
1
0
0
1
0
0
0
0
1
X
X
10/2004
*Decimal point and Comma can be displayed with or without any numeral.
0.185
0.250
0.020
DIONICS
DI-8884A
DI-8884A High Voltage Cathode Decoder/Driver
Absolute Maximum Ratings
Input Voltage (Vcc)
Segment Output Voltage
Power Dissipation
Transient Segment Output Current
Operation Temperature Range
Storage Temperature Range
7V
110V
600mW
50mA
0
0 C to 70
0
C
-65
0
C to 150
0
C
Electrical Characteristics ( 0
0
C < T
a
< 70
0
C - Unless otherwise noted; Vcc = 5V ± 5% )
Parameter
Conditions
Min.
Logic "1" Input Voltage
V
cc
= 4.75V
2.0
Logic "0" Input Voltage
V
cc
= 4.75V
−
Logic "1" Input Current
V
cc
= 5.25V; V
in
= 2.4V
−
Logic "0" Input Current
V
cc
= 5.25V; V
in
= 0.4V
−
Positive Input Clamp Voltage
V
cc
= 4.75V; I
in
= 1.0mA
5.0
Negative Input Clamp Voltage V
cc
= 5.0 V; I
in
= -12.0 mA; @T
a
= 25
0
C
−
Power Supply Current
V
cc
= 5.25V; R
p
= 2.8K; All V
in
= 5V
−
Segment Outputs
All Outputs On Current Ratio
All V
out
= 50V
Output b Current = Ref.
0.9
Output b On Current
V
cc
= 5V; V
out
@ b=50V; @T
a
= 25
0
C
R
p
= 18.1K
0.18
R
p
= 7.03K
0.45
R
p
= 3.40 K
0.90
R
p
= 2.80K
1.03
Output Leakage Current
V
out
= 75V
−
Output Breakdown Voltage
I
out
= 10µA
110
Propagation Delay
Any Input to Segment Output
V
cc
= 5V; @T
a
= 25
0
C
−
Max.
−
1.0
15.0
-250
−
-1.5
40.0
Unit
V
V
µA
µA
V
V
mA
1.1
0.22
0.55
1.10
2.00
5.0
−
10.0
−
mA
mA
mA
mA
µA
V
µs
Pin Designation
Vcc
18
a
17
b
16
c
15
d
14
e
13
f
12
g
11
DP
OUT
10
1
Prog.
Input
2
A
3
B
4
C
5
D
6
DP
IN
7
COM
IN
8
COM
OUT
9
GND
GD32 MCU
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