DS8887, DS78/8889, DS78/8897A National Semiconductor Display Controllers/Drivers DS8887 8-Digit High Voltage Anode Driver (Active-High Inputs) DS7889/DS8889 8-Segment High Voltage Cathode Driver (Active-High Inputs) DS7897A/DS8897A 8-Digit High Voltage Anode Driver (Active-Low Inputs) General Description The DS8887 and DS7897A/DS8897A are de- signed to drive the individual anodes of a 7-seg- ment (cathodes} high-voltage gas discharge panel in a time multiplexed fashion. When driven with appropriate input signals, the driver will switch voltage and impedance levels at the anode. This will allow or prevent ionization of gas around selected cathode in order to form a numeric display. This main application is to inter- face with MOS outputs (fully-decoded} and the anodes of a gas-discharge panel, since the devices can source up to 16 mA at a low impedance and can tolerate more than 55V in the OFF state. DS7889/DS8889 is capable of driving 8 segments of a high-voltage display tube with a constant output sink current, which can be adjusted by external program resistor, Rp: The program cur- rent is half that of output ON current. In the OFF state the outputs can tolerate more than 80V. The ratio of ON output currents is within +10%. Inputs have negative clamp diodes. Active high input logic. The main application of the device is to interface MOS circuits to high-voltage displays. Unused outputs should have correspond- ing inputs connected to Vee. Features m Versatile circuits for a wide range of display applications B High breakdown voltages Low power dissipation Connection Diagrams (dual-in-line packages) 0S8887, DS7897/DS8897 INPUTS Veo bz pa SCOP a 03 OB | B |v | [is fi [ss i if Jo ] 1 ? ] 3 { {5 [ r le if ot pz D3 en DB Vgias. (suB) OUTPUTS TOP VIEW Order Number DS7897AJ, DS8887U, DS8897AJ or DS8897AN See NS Package J18A or N18A DS7889/DS8889 OUTPUTS a b c q e f 9 h Vee {rs Ju hie [is re [3 jr |v 10 1 2 3 4 5 6 7 8 g TTF INPUTS TOP VIEW Order Number DS7889J, DS8889J or DS8889N See NS Package J18A or N18A Absolute Maximum Ratings (note 1) Supply Voltage (Vcc Veias) (Note 2) 0S$8887, 0S7897A, DS8897A ~60V input Voltage DS8887, DS7897A/DS8897A 20V DS7899/DS8889 (Note 3) 35V Output Voltage DS8887, DS7897A/DS8897A 65V DS7889/DS8889 85V Storage Temperature Range -65C to +150C DS7889/DS8889 Maximum Power Dissipation at 25C Cavity Package ~ 1436 mW Molded Package 1563 mW DS8887, DS7897A/DS8897A Maximum Power Dissipationt at 28C Cavity Package 1496 mW Molded Package 1714 mW Lead Temperature (Soldering, 10 seconds) 300C Electrical Characteristics (notes 2, 3 and 4) Operating Conditions MIN MAX UNITS Supply Voltage (Vcc Baas) DS8887, DS7897A/DS8897A 40 -60 v Temperature (Ta) DS7889, DS7897A 55 +125 c DS8897' DS8889, DSB897A 0 +70 c *Derate cavity package 11.49 mW/C above 25C; derate molded package 12.5 mW/C above 25C. tDerate cavity package 11.97 mW/C above 25C; derate molded package 13.71 mW/C above 25C. PARAMETER | CONDITIONS | min [| typ | max _| UNITS 0S8887, DS8897A, DS7897A Vin Logica 1 Input Voltage Vout =71.4V. lout = 16 mA, DS8887 2.0 Vin Logical 0 Input Voltage Vout = ~60V, lour = ~100HA, DS8887 55 | lin Logical 1" Input Current Vout =1.4V, lour = 716 mA, DS8897A, DS7897A -300 BA hie , Logical 0 Input Current Vout = ~60V, lout = 100HA, 0S8897A, DS7897A -10 HA l, Input Current Vin = 71.0V 335 550 BA DS8887 Vin =6.0V 0.2 -25 BA Vin = 712V 0.10 0.65 mA 0S7897A, DS8897A, Vin = 712V 0.45 -15 mA Vout ore Output OFF Voltage lout = ~100HA, lin = OHA 60 -77 Vv lout orf Output OFF Current Vour = 55V, lin = OHA 0.03 5.0 BA Vout on Output ON Voltage Vin = 72.0V, DS8887 -1.0 -14 Vv lout =16mMA tin = ~3002A, DS8897A, DS7897A -14 v loras Vejag Current ; =-16 mA Vin = 71.0V, DS8887, (Note 5) 2.2 4.0 mA out = ~1O MA, VT 2 300uA, DS8897A, DS7897A Veias = ~60V -1.0 mA (One Driver Only) DS7889/DS8889 l, Input Current Vin =6.0V 150 250 350 KA hi Logical 0 input Current lout = 9.0HA, Vout = 75V 7.0 BA li Logical 1" Input Current lout = 1.4.mA, lip = 850A, Vour = 50V 80 BA vi Input Clamp Voltage hy = 71.0 mA, Ta = 25C ~0.68 -0.85 Vou Output Breakdown Voltage four = 100A, In = OHA 80 loex Output Leakage Current Vout = 75V, 0.1 mA < lin S7.0KA 0.02 5.0 RA lpRoc Prog. Input Voltage lip = 150KA 18 2.3 Vv lp = 850KA 4.0 45 Vv lo. Logical 0 Output Current he = 1504 DS7889 210 300 390 uA eo DS8889 240 300 360 | HA Vout =50V, DS7889 660 800 940 BA lip = 400KA BOUA < hin Sle DS8889 680 800 920 uA 1. = 850uA 0S7889 1.45 V7 1.95 mA eee nsesea 1.53 7 187 | mA Ato Output Current Ratio lout b Ref = 1.7 mA, Vout = 50V 0.9 1.0 1.1 5-161 V688/8ZSQ 6888/8ZSd Z888Sd DS8887, DS78/8889, DS78/8897A Switching Characteristics 1, = 25C unless otherwise specified. PARAMETER CONDITIONS | MIN TYP | MAX | UNITS 0S8887 ton Propagation Delay from Input (See ac Test Circuit and Switching Time 5.0 us to Output ON Waveforms) trise Propagation Delay from Input (See ac Test Circuit and Switching Time 1.0 Bs to Output ON Waveforms) DS7889/DS8889 togo Propagation Delay to a Logical Rp = 6.0k to 6.0V, Rout = 1.0k to 6.0V 37 100 ns 0 from Input to Output toat Propagation Delay to a Logical Input Ramp Rate < 15 ns, Freq = 1.0 MHz 92 200 ns 4 from Input to Output dc = 50%, Amplitude = 6.0V Note 1: Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The table of Electrical Characteristics provides conditions for actual device operation. Note 2: All voltage shown for DS8887, DS7897A/DS8897A W.R.T. Vcc = OV. Ail currents into device pins shown as positive, out of device pins as negative. All values shown as max or min on absolute basis. Note 3: All voltages for DS7889/DS8889 with respect to Veg = OV. Note 4: Unless otherwise specified min/max limits apply across the 5C to +125C temperature range for the DS7889 and DS7897A, and across the 0C to +70C range for the DS8887, DS8889 and DS8897A. All typicals are given for Ta = 25C. Note 5: Supply currents specified for any one input = 1.0V. Al other inputs = 5.5V and selected output having 16 mA load. Typical Application Typical Performance og: Characteristics 1M (NOTE 1) (NOTE 1) Un vs Ving 0 Ty, 25 MAX POINT Vee = -80V 400 | psase7 200k 200 z YP 0s7880/ 0s7897/ z TYPICAL Dseas7 = 6 arHoD osesa7 CATHODE ANODE = ORIVER DRIVER ~200 @ (NOTE 2) 3 400 8 CAPACITORS = -a00 ~12 -10 -80 -60 -40 -20 0 B-ANODE Viv (V) CONTROL LINES Note 1: All outputs of both cathode and anode driver have loads as shown for output a and digit 1. Note 2: Use DS8887 for active-high inputs and DS8897 for sctive-low inputs. AC Test Circuit and Switching Time Waveforms ouseut LOAD ' INPUT O i i aaa ee} het DS8ed7 be-ton -1.0 i 8 = 600 1M QutPUT 60 LL. Gv -12 -60V tause -162 Logic Diagrams Vec DS7889/DS8889 DS8887 proc oroc ero rennet 4 lp: DUTPUT | 3 | > 10k | 5.4k > | | 104 WNW | INPUT A | 2 6.2k | | | | Lo ouTPUT | one oF ercut ppivers sHown | | | Lo J Vers DS7897A/DS8897A coma | \ 3 | 1k 4 jNPUT I | I | | V2688/8ZSC 6888/8ZSC Z888Sd