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This high-density System-in-Package SiP integrates controller, power switches, and support components.

Skip to main content. The 74LS90 is a simple counter, i. The binary output is reset to at every tenth pulse and count starts from 0 again. A pulse is also generated probably at pin 9 as it resets its output to The chip can runcionamiento up to other maximum numbers and return to zero by changing the modes of These modes are set by changing the connection of reset pins R 1 – R 4.

74LS90 | IC 74LS90 Datasheet | IC Pin Diagram & Description

The other high counts fubcionamiento be generated by connecting two or more ICs. For example, if two are connected in a manner that input of one becomes the output of other, the second IC will receive a pulse on every tenth count and will reset at every hundredth count. Thus this system can count from 0 to 99 and give corresponding BCD outputs. It can be used as a divide by 10 counter by connecting Q A with clock input2, grounding all the reset pins, and giving pulse at clock input1.


This enables the cascade connection of the inbuilt counters. By connecting Q A with input1, can be used for BCD counting whereas by connecting Q D with input2, it can be used for bi-quinary funciinamiento.

Bi-quinary is a system for storing decimal digits in a four-bit binary number.


The bi-quinary code was used in the abacus. Supply voltage; 5V 4.

Output 3, BCD Output bit 2. Output 2, BCD Output bit 1. Output 4, BCD Output bit 3. Output 1, BCD Output bit 0.

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