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DS7880 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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DS7880 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 6 page  TLF5845 March 1988 DS7880DS8880 High Voltage 7-Segment DecoderDriver General Description The DS7880DS8880 is custom designed to decode four lines of BCD and drive a gas-filled seven-segment display tube Each output constitutes a switchable adjustable current sink which provides constant current to the tube segment even with high tube anode supply tolerance or fluctuation These current sinks have a voltage compliance from 3V to at least 80V typically the output current varies 1% for out- put voltage changes of 3 to 50V Each bit line of the decod- er switches a current sink on or off as prescribed by the input code Each current sink is ratioed to the b-output cur- rent as required for even illumination of all segments Output currents may be varied over the 02 to 15 mA range for driving various tube types or multiplex operation The output current is adjusted by connecting an external pro- gram resistor (RP) from VCC to the Program input in accord- ance with the programming curve The circuit design pro- vides a one-to-one correlation between program input cur- rent and b-segment output current The Blanking Input provides unconditional blanking of any output display while the Ripple Blanking pins allow simple leading- or trailing-zero blanking Features Y Current sink outputs Y Adjustable output current02 to 15 mA Y High output breakdown voltage110V typ Y Suitable for multiplex operation Y Blanking and Ripple Blanking provisions Y Low fan-in and low power Logic Diagram TLF5845 – 1 C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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Similar Description - DS7880 |
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