STMicroelectronics M74HC238M 3-to-8 Line Decoder/Demultiplexer

The M74HC238M is a high-speed CMOS 3-to-8 line decoder/demultiplexer integrated circuit manufactured by STMicroelectronics. This device is designed to accept three binary weighted address inputs (A0, A1, and A2) and, when enabled, provides eight mutually exclusive active-LOW outputs (Y0 to Y7).

The M74HC238M is a versatile component suitable for a variety of digital applications, including data routing, memory address decoding, and the expansion of output lines. The device features three enable inputs: two active-LOW (E1, E2) and one active-HIGH (E3). The decoder function is enabled when E1 and E2 are held LOW and E3 is held HIGH. When any of the enable inputs is at the invalid level, all outputs assume the HIGH state.

Constructed with silicon gate CMOS technology, the M74HC238M offers the inherent benefits of CMOS products, such as low power consumption, reduced noise, and high immunity to noise. The device operates over a broad voltage range from 2V to 6V and provides standardized symmetrical output characteristics.

The M74HC238M is provided in a 16-pin SOIC package, making it compact and suitable for surface-mounted technology (SMT). Its robust design ensures that it is compatible with all popular logic families through the use of appropriate external resistors.

Key features of the M74HC238M include:

• High-speed operation: tpd = 19 ns (typ) at Vcc = 6V
• Low power consumption: Icc = 4 µA (max) at Ta = 25°C
• High noise immunity: Vnih = Vnil = 28% Vcc (min)
• Output drive capability: 10 LSTTL loads
• Symmetrical output impedance: |Ioh| = Iol = 4 mA (min)
• Wide operating voltage range: Vcc (opr) = 2V to 6V
• Pin and function compatible with 74 series 238

The M74HC238M is ideal for applications where high-speed decoding and demultiplexing are required. Its low power consumption and high noise immunity make it a reliable choice for battery-operated and noise-sensitive electronic systems.

For more information, datasheets, and support, customers can visit the STMicroelectronics website or contact their local ST sales office.