High Voltage 7-segment Decoder/driver -

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 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 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 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. By National Semiconductor Corporation
DS7880 's PackagesDS7880 's pdf datasheet
DS8880




DS7880 Pinout will be updated soon..., now you can download the pdf datasheet to check the pinouts !
DS7880 circuits will be updated soon..., now you can download the pdf datasheet to check the circuits!

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