General Description

The DM74LS47 accepts four lines of BCD (8421) input

data, generates their complements internally and decodes

the data with seven AND/OR gates having open-collector

outputs to drive indicator segments directly. Each segment

output is guaranteed to sink 24 mA in the ON (LOW) state

and withstand 15V in the OFF (HIGH) state with a maximum

leakage current of 250 mA. Auxiliary inputs provided

blanking, lamp test and cascadable zero-suppression functions.

Features

n Open-collector outputs

n Drive indicator segments directly

n Cascadable zero-suppression capability

n Lamp test input