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7448 BCD TO 7-SEGMENT DECODER DRIVER IC

20.00 EGP

SKU: IC_7448 Categories: ,

Specifications
Product: Decoder / Demultiplexer
Logic Family: 74LS
Number of Lines (Input / Output): 4 / 7
Supply Voltage – Max: 5.25 V
Supply Voltage – Min: 4.75 V
Maximum Operating Temperature: 70 C
Minimum Operating Temperature: 0 C
Number of Input Lines: 4
Number of Output Lines: 7

Segment Identification Pin Out Diagram for 7448 - BCD to 7 segement converter / driver (Common Cathode)
7448 DATASHEET

This package accepts a 1-2-4-8 positive-logic Binary Coded Decimal (BCD) input and converts it to the proper pattern necessary to illuminate a 7 segment display. A high output is intended to light the segment. (Common cathode), meaning the negative connection of all of the LEDs is tied together.

The outputs are open-collector but have internal 2K ohm pull-up resistors and have a maximum low-level output sink current of 6 milliamperes (6mA).

For normal operation the Lamp Test pin and BI/RBO (OUT) m

To build a simple 0-9 digital counter, consider using the 7490 decade counter. It’s 4 outputs can be directly interfaced to the 7448 / 7447 and the binary coded decimal will be converted into the appropriate segments for the LED display. Other than a little more conditional logic connections and a few more stages, there’s nothing stopping you from building a full digital clock with hours, minutes, and seconds.

Shown above, is an example application of the 74LS48 7-seg decoder circuit. The decimal point indicator on this volt-meter as well as the colons “:” on clocks, are not controllable by the 7-seg decoder. In circuits involving a microcontroller, if I/O pins are available, 7448 / 7447 ICs (and similar) are generally omitted to save money. A microcontroller can be programmed to perform the binary to decimal conversion and then use a look-up chart to perform the segment conversion. However, if pins are limited on the microcontroller, it can be advantageous to use 7448 ICs in a multiplexing fashion to drive the 7-segment displays. In this method, the microcontroller would send BCD (binary coded decimal) on 4 output pins to the 7448 chips. A line selector (an additional output line on the microcontroller) could select which 7448 chip to target and cycle through the set of displays to produce the overall numeric output.


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