1010101010101010

1010101010101010 is a 16-bit binary sequence in which bits alternate between 1 and 0, beginning with a 1 at the most significant bit. The pattern is often used as a simple, reproducible test signal in digital circuits.

In hexadecimal notation, this pattern corresponds to 0xAAAA. As an unsigned integer, its value is 43690. If interpreted as a signed 16-bit two's complement value, it represents -21846.

The alternating bit pattern is useful in testing data buses, memory interfaces, and timing of logic circuits because it stresses transitions between adjacent lines. It can be generated by simple hardware such as a counter with a toggle, or by a bitwise XOR of a repeating pattern. In software, it can be produced by shifting and XOR operations or as a constant.

In digital design, repeating patterns like 1010... are often used together with complementary patterns (0101...) to exercise both rising and falling edges. The 0xAAAA pattern is also used in some encoding schemes and as a reference for bit-pattern recognition in documentation and examples.