![]() Lamp test (LT\) of these types may be performed at any time when the BI\/RBO\ node is at a high level. The '46A, '47A, '48, 'LS47, and 'LS48 circuits incorporate automatic leading and/or trailing-edge zero-blanking control (RBI\ and RBO\). Display patterns for BCD input counts above 9 are unique symbols to authenticate input conditions. Segment identification and resultant displays are shown below. The 'LS49 circuit incorporates a direct blanking input. All of the circuits except 'LS49 have full ripple-blanking input/output controls and a lamp test input. The '48, 'LS48, and 'LS49 feature active-high outputs for driving lamp buffers or common-cathode LEDs. The '46A, '47A, and 'LS47 feature active-low outputs designed for driving, common-anode LEDs or incandescent indicators directly. All Circuit Types Feature Lamp Intensity Modulation Capability. ![]() Internal Pull-Ups Eliminate Need for External Resistors.Open-Collector Outputs Drive Indicators Directly.
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