What is the 7490 chip?
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What is the 7490 chip?
The 7490 is a decade counter, meaning it is able to count from 0 to 9 cyclically, and that is its natural mode. That is, QA, QB, QC and QD are 4 bits in a binary number, and these pins cycle through 0 to 9, like this: QD QC QB QA 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 0 0 1.
What is the purpose of pins 4 and 13 in IC 7490?
7490 IC Decade Counter
| Pin No | Function | Name |
|---|---|---|
| 11 | Output 4, BCD Output bit 3 | QD |
| 12 | Output 1, BCD Output bit 0 | QA |
| 13 | Not connected | NC |
| 14 | Clock input 1 | Input1 |
How does a BCD counter work?
BCD counters follow a sequence of ten states and count using BCD numbers from 0000 to 1001 and then returns to 0000 and repeats. Such a counter must have at least four flip-flops to represent each decimal digit, since a decimal digit is represented by a binary code with at least four bits giving a MOD-10 count.
What is counter IC?
A counter IC is an IC that can count externally input clock pulses. ABLIC’s counter IC can read the counter data via the I2C-bus interface. This capability supports the development of a variety of measuring instruments, infrastructure meters, amusement devices, life counters, etc.
What is IC 7490 called?
It is an Asynchronous Decade Counter IC. IC 7490 can count the binary numbers from 0000 to 1001. After 1001 it gets reset and again starts counting. As the IC 7490 gets reset after counting ten numbers, it is called MOD-10 Decade Counter.
What is disadvantage of SR flip flop?
When the S and R inputs of an SR flipflop are at logical 1, then the output becomes unstable and it is known as a race condition. So, the main disadvantage of the SR flip flop is invalid output when both inputs are high.
How many outputs will a decimal to BCD encoder have?
4 outputs
How many outputs will a decimal-to-BCD encoder have? Explanation: An encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. Thus, a decimal to BCD encoder has 4 outputs.
What is D stands for in D register?
Explanation: D stands for “data” in case of flip-flops and not delay. Registers are made of a group of flip-flops.