IC number 7447 are circuits for BCD to seven segment converters and display from numbers 0 to 9. It decodes BCD in seven segmentations. Normally, IC7447 accepts input that is binary code values. The BCD is processed into seven segments shown as numbers 0 to 9 on a monitor.
This article will dive into details about the 7447 IC and how it works, its pin configuration and other characteristics and features, and its operation. Therefore, if you are an electronics enthusiast or repairman who works with motherboards, you can gain more insights into identifying common issues with this integrated circuit.
What is a 7447 IC?
The IC7447 is an integrated circuit in the 74xx category of logic devices like calculators, digital counters, clocks, and other measuring instruments. Additionally, it comprises a BCD to 7 segment display decoder and a 15V open collector output. The 7447IC is produced and distributed in a 14-pin dual-in-line package.
(a picture of the seven segments LED mounted on PCB and isolated on a white background)
BCD Seven Segment Display Using IC 7447: How does IC 7447 work?
A driver is a combinational logic circuit for converting a certain number of input lines toward output lines. In the case of BCD to 7 segment decoder, conversion is of BCD to an equivalent decimal. Further, the IC7447 IC is the BCD to seven segment converter whose design and operation are based on Boolean algebra and logic gates.
The seven-segment display has four input lines and seven output lines. A display decoder is applied to convert BCD code to the seven-segment code. The IC7447 receives binary coded decimals related to the seven-segment code as input and output. For that, it used to display both numbers and characters. The complement data of BCD is produced internally; hence, no coding or programming is required.
(image of Seven-segment display (SSD), or indicator, an electronic display device for displaying decimal numerals. On green pcb with controller)
Ic7447 IC Pin configuration
The IC7447 IC pin configuration diagram indicates:
- A0, A1, A2, A3 as the BCD input pins.
- Lamp Test (LT) represents display test
- RBO: Ripple blanking output pin
- RBI: Ripple blanking Input pin
- a, b, c, d, e, f, g indicate outputs for the seven-segment display
Firstly, the symbols indicate BCD input counts above nine to authenticate input conditions. Aside from incorporating zero-blanking control (RBI and RBO), the circuit also employs automatic leading and trailing edge.
The lamp test application is at any time when either of the ripple banking nodes is at a high logic level. Also, the 74xx circuit family has overriding blanking input (BI) for controlling the lamp intensity -through pulsing or to inhibit the outputs.
(A picture of the IC 7447 pin configuration)
Features and Specifications
The 74xx ICs series are the most common logic family and use logic gates, flip-flops, and counters. For this instance, here are the specification and product details of 7447IC:
- has a broader Voltage range
- A variety of operating conditions
- internal pull-ups ensure you don't need external resistors
- Four input lines and seven output lines
- input clamp diode hence no need for high-speed termination
- comes with open collector output
- package has one by 7447 Ic
- IC number 7447
- BCD to 7 Segment converters, displaying 0-9
- The operating voltage supply is 5 volts (min. 4.75, max. 5.25)
- has a 14-16 pin in a dual-in-line (DIP package)
(image of a binary code on an IC chip )
It is safe to conclude from the information above that it is impossible to talk about the IC 7447 without mentioning the BCD to 7-segment decoder display. I hope you have found this article informative while working with devices that display numerical information.
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