High Voltage 7-Segment Decoder Driver
DS7880 DS8880 High Voltage 7-Segment Decoder Driver
March 1988
DS7880 DS8880 High Voltage 7-Segment Decoder Driver
Ge...
Description
DS7880 DS8880 High Voltage 7-Segment Decoder Driver
March 1988
DS7880 DS8880 High Voltage 7-Segment Decoder Driver
General Description
The DS7880 DS8880 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 output voltage changes of 3 to 50V Each bit line of the decoder switches a current sink on or off as prescribed by the input code Each current sink is ratioed to the b-output current as required for even illumination of all segments
Output currents may be varied over the 0 2 to 1 5 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 accordance with the programming curve The circuit design provides a one-to-one correlation between program input current 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 current 0 2 to 1 5 mA Y High output breakdown voltage 110V typ Y Suitable for multiplex operation Y Blanking and Ripple Blanking provisions Y Low fa...
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