BK Precision 4011A Instruções de Operação descarregar pdf (Página 41)

Laboratory 12: Digital Logic Circuits

201029

Laboratory #12:

Digital Logic Circuits

Objectives:

To obtain experience with digital circuits. Implementation of BCD to seven segment decoder.

Equipment Needed:

 7447 BCD to seven segment decoder.

 Digi-trainer designer board.

 One 330 ohm resistor chip or seven 330 ohm resistors.

 Seven segment display.

Procedure:

1. DECODER: Connect the inputs of the decoder to the four data switches on the trainer. Use

the A input of the decoder as the least significant bit.

2. DECODER: Make sure the V

input is connected to +5V. Also, make sure the GND input

is connected to ground, and the LT input must be tied high.

3. Next connect the a-g outputs of the decoder through the resistors to the corresponding input

on the 7-segment display. Also, connect pin 14 of the 7-segment display to +5V. Caution!!!

Do not connect any inputs of the 7-segment display to ground.

4. Demonstrate to your instructor that the display cycles through the proper count using the cor-

responding inputs on the trainer.

common

mode

N/C

common

mode

DISPLAY

7-SEGMENT LED

(TOP VIEW)

DP = Decimal Point



B1/RB0

RB1

GND

SN5446A, SN5447A, SN54LS47, SN5448,

SN54LS48 … J Package

SN7446A, SN7447A, SN7448 … N Package

SN74LS47, SN74LS48 … D or N Package

(TOP VIEW)

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BK Precision 4011A Instruções de Operação Página 41