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 - 8884 a 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 si nks, 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 resis tor (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 packag e package layout: v truth table function decimal point comma d c b a a b c d e f g display 0 1 1 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 1 1 0 0 1 1 1 1 2 1 1 0 0 1 0 0 0 1 0 0 1 0 3 1 1 0 0 1 1 0 0 0 0 1 1 0 4 1 1 0 1 0 0 1 0 0 1 1 0 0 5 1 1 0 1 0 1 0 1 0 0 1 0 0 6 1 1 0 1 1 0 0 1 0 0 0 0 0 7 1 1 0 1 1 1 0 0 0 1 1 1 1 8 1 1 1 0 0 0 0 0 0 0 0 0 0 9 1 1 1 0 0 1 0 0 0 0 1 0 0 10 1 1 1 0 1 0 1 1 0 0 0 1 1 11 1 1 1 0 1 1 1 1 0 0 0 1 0 12 1 1 1 1 0 0 0 0 1 1 1 0 0 13 1 1 1 1 0 1 0 1 1 0 0 0 0 14 1 1 1 1 1 0 1 1 1 1 1 1 0 15 1 1 1 1 1 1 1 1 1 1 1 1 1 *decimal point 0 1 x x x x x x x x x x x *comma 0 0 x x x x x x x x x x x *decimal point and comma can be displayed with or without any numeral. 09/ 2001 0.900 dionics di-8884a 0.070 0.250 0.020 0.025 0.185
di - 8884a high voltage cathode decoder/driver v electrical characteristics ( 0 0 c < t a < 70 0 c - unless otherwise noted; vcc = 5v 5% ) parameter conditions min. max. unit logic "1" input voltage v cc = 4.75v 2.0 - v logic "0" input voltage v cc = 4.75v - 1.0 v logic "1" input current v cc = 5.25v; v in = 2.4v - 15.0 a logic "0" input current v cc = 5.25v; v in = 0.4v - - 250 a positive input clamp voltage v cc = 4.75v; i in = 1.0ma 5.0 - v negative input clamp voltage v cc = 5.0 v; i in = - 12.0 ma; @t a = 25 0 c - - 1.5 v power supply current v cc = 5.25v; r p = 2.8k; all v in = 5v - 40.0 ma segment outputs all outputs on current ration all v out = 50v output b current = ref. 0.9 1.1 - output b on current v cc = 5v; v out @ b=50v; @t a = 25 0 c r p = 18.1k 0.18 0.22 ma r p = 7.03k 0.45 0 .55 ma r p = 3.40 k 0.90 1.10 ma r p = 2.80k 1.08 1.32 ma output leakage current v out = 75v - 5.0 a output breakdown voltage i out = 10a 110 - v propagation delay any input to segment output v cc = 5v; @t a = 25 0 c - 10.0 s v pin designation d a 17 vcc prog. input 15 7 gnd 8 6 12 com out 5 c 16 b f dp in a 3 9 10 d 4 18 2 g 13 1 11 e b c 14 dp out com in v absolute maximum ratings input voltage (vcc) 7v segment output voltage 110v power dissipation 600mw transient segment output current 50ma operation temperature range 0 0 c to 70 0 c storage temperature range - 65 0 c to 150 0 c
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