The SN75491, SN75491A, SN75492, and SN75492A are monolithic integrated circuits designed to be used together with MOS integrated circuits and common-cathode LEDs in serially addressed multi-digit displays. This time-multiplexed system, which uses a segment address and digit scan method of LED drive, minimizes the number of drivers required.
The SN75491 and SN75491A are quadruple-segment drivers. The SN75492 and SN75492A are hex-digit drivers. The SN75491 and SN75492 are characterized for operation to 10 volts. The SN75491A and SN75492A are characterized for operation to 20 volts.
