Basic way of using a 74LS47 IC to drive a common-anode LED display. The 74LS47 has active-low outputs designed for driving a common-anode LED display via external current-limiting resistors (Rx), as shown in Figure 2.įIGURE 2. Functional diagram of the (a) 74LS47 and (b) 74LS48 BCD-to-seven-segment decoder/driver ICs. Figure 1 shows the functional diagrams and pin designations of these devices, each of which is housed in a 16-pin DIL package.įIGURE 1. They have integral ripple-blanking facilities, but do not incorporate data latches. These seven-segment decoder/driver ICs are members of the LS TTL family. The rest of this article describes a few of the most popular of these devices. Some of these devices have integral ripple-blanking facilities, others have built-in data latches, and a few even have built-in decade counter stages, etc. ![]() PRACTICAL DECODER/DRIVER ICsĭecoder/driver ICs are available in both TTL and CMOS forms. This concluding episode deals with practical seven-segment decoder/driver ICs. The opening episode of this special feature explained the basic operating and usage principles of seven-segment alphanumeric displays.
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