STMicroelectronics M74HC238B1 - 3-to-8 Line Decoder/Demultiplexer

The M74HC238B1 is a high-speed CMOS 3-to-8 line decoder/demultiplexer manufactured by STMicroelectronics. This integrated circuit is designed to accept three binary weighted address inputs (A0, A1, and A2) and, when enabled, provides eight mutually exclusive active HIGH outputs (Y0 to Y7).

This device comes with two enable inputs (E1 and E2) and one active LOW enable input (E3). The M74HC238B1 is capable of decoding information from a binary-coded input to one of eight output lines, making it ideal for a wide range of applications in system address decoding, data routing, and memory chip selection.

The M74HC238B1 operates over a broad voltage range from 2V to 6V and offers the ability to drive 10 LSTTL loads, ensuring compatibility with older technology systems. The high noise immunity characteristic of CMOS technology, coupled with the low power consumption, makes this decoder/demultiplexer a reliable and efficient choice for modern electronic designs.

Key features of the M74HC238B1 include:

• High-speed operation: Typical tPD of 15ns at VCC = 5V
• Low power dissipation: ICC = 4µA (max) at TA = 25°C
• High noise immunity: VNIH and VNIL = 28% VCC (min)
• Power-down protection on inputs and outputs
• Symmetrical output impedance: |IOH| = IOL = 4mA (min)
• Pin and function compatible with 74 series 238
• ESD performance: HBM > 1KV; MM > 200V; CDM > 1000V

The versatility of the M74HC238B1 makes it suitable for interfacing with microprocessors/microcontrollers where multiple outputs need to be controlled by a small number of inputs, such as in digital control systems, telecommunications, and computing equipment.

STMicroelectronics provides this IC in a standard 16-pin plastic DIP package, ensuring easy integration into various circuits. The M74HC238B1 is a testament to STMicroelectronics' commitment to providing high-quality, reliable electronic components for advanced digital systems.