STMicroelectronics M74HC148B1R 8-to-3 Line Priority Encoder

The M74HC148B1R is a high-speed CMOS 8-to-3 line priority encoder designed and manufactured by STMicroelectronics, a global semiconductor leader known for its commitment to delivering innovative and sustainable solutions. This integrated circuit is part of the HC family, which ensures a balance between speed and power consumption, making it an ideal choice for a wide range of digital applications.

The encoder is designed to accept eight active low inputs and convert the active input with the highest priority into a three-bit binary code on its outputs. The priority is determined by the input line number, with input line 7 having the highest priority and line 0 the lowest. This feature simplifies the design of combinational logic systems and is particularly useful in applications where multiple interrupt lines need to be encoded into an interrupt vector for a microprocessor's interrupt handling routine.

Featuring a common Enable input, the M74HC148B1R can be easily cascaded with other encoders to encode higher numbers of inputs without the need for additional gating. When the Enable input is held high, all outputs remain in the high state, which is also the default condition when no inputs are active.

The device operates over a broad voltage range from 2V to 6V, providing compatibility with TTL levels while offering the benefits of CMOS technology, such as low quiescent current and reduced power consumption. The M74HC148B1R is also characterized by its fast propagation delay times, which are critical for high-speed digital systems.

Available in a DIP-16 package, the M74HC148B1R can be easily integrated into both prototyping and production environments. Its robust design ensures reliable operation over an industrial temperature range of -55°C to +125°C, making it suitable for demanding applications across various industries including telecommunications, computing, and consumer electronics.

With its combination of high-speed operation, low power consumption, and reliable performance, the STMicroelectronics M74HC148B1R is a versatile component that provides an efficient solution for digital encoding challenges.