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The DM7446A and DM7447A feature active-LOW outputsdesigned for driving common-anode LEDs or incandescentindicators directly. All of the circuits have full ripple-blankinginput/output controls and a lamp test input. Segmentidentification and resultant displays are shown on a followingpage. Display patterns for BCD input counts above nineare unique symbols to authenticate input conditions.All of the circuits incorporate automatic leading and/or trailing-edge, zero-blanking control (RBI and RBO). Lamp test(LT) of these devices may be performed at any time whenthe BI/RBO node is at a HIGH logic level. All types containan overriding blanking input (BI) which can be used to controlthe lamp intensity (by pulsing) or to inhibit the outputs.
