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 (Rp) from Vcc to the program input.
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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 0C -65 0C to 150 0C
Electrical Characteristics ( 0 0C < Ta < 70 0C - Unless otherwise noted; Vcc = 5V ± 5% )
Parameter Conditions Min. Logic "1" Input Voltage Vcc = 4.75V 2.0 Logic "0" Input Voltage Vcc = 4.75V − Logic "1" Input Current Vcc = 5.25V; Vin = 2.4V − Logic "0" Input Current Vcc = 5.25V; Vin = 0.4V − Positive Input Clamp Voltage Vcc = 4.75V; Iin = 1.0mA 5.0 0 Negative Input Clamp Voltage Vcc = 5.0 V; Iin = -12.0 mA; @Ta = 25 C − Power Supply Current Vcc = 5.25V; Rp = 2.8K; All Vin = 5V − Segment Outputs All Outputs On Current Ratio All Vout = 50V Output b Current = Ref. 0.9 0 Output b On Current Vcc = 5V; Vout @ b=50V; @Ta = 25 C Rp = 18.1K 0.18 Rp = 7.03K 0.45 Rp = 3.40 K 0.90 Rp = 2.80K 1.03 Output Leakage Current Vout = 75V − Output Breakdown Voltage Iout = 10µA 110 Propagation Delay Any Input to Segment Output Vcc = 5V; @Ta = 25 0C −
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
