STMicroelectronics 74AC138MTR Decoder/Demultiplexer

The 74AC138MTR is a high-speed CMOS 3-to-8 line decoder/demultiplexer integrated circuit designed and manufactured by STMicroelectronics, a leader in semiconductor solutions. This device is particularly well-suited for implementation in memory decoding or data routing applications where high-speed and low power consumption are required.

Featuring a wide operating voltage range from 2V to 6V, the 74AC138MTR provides flexibility for use in various systems. Its low quiescent current and high noise immunity of the Advanced CMOS (AC) technology make it an excellent choice for battery-operated devices and other applications sensitive to power efficiency and noise performance.

The decoder/demultiplexer accepts three binary weighted address inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive active-LOW outputs (Y0 to Y7). The device includes three enable inputs, two active-LOW (E1, E2) and one active-HIGH (E3), which must be satisfied to activate the decoding/demultiplexing function. When the enable conditions are not met, all outputs remain in the HIGH state, ensuring no spurious activations.

Key features of the 74AC138MTR include:

• High-speed operation: t<sub>PD = 4.5 ns (max) at V<sub>CC = 5V
• Low power dissipation: I<sub>CC = 4 μA (max) at T<sub>A = 25°C
• Multiple package options, including the space-saving TSSOP package
• High noise immunity characteristic of CMOS devices
• Significant power reduction compared to LSTTL logic ICs
• Latch-up performance exceeds 500mA
• ESD performance: Human-body model > 2000V, Machine model > 200V

The 74AC138MTR is supplied in a TSSOP16 package, which is designed for surface mount technology (SMT), making it suitable for compact PCB layouts and automated assembly processes. Its tape and reel packaging (MTR suffix) ensures compatibility with automated pick-and-place equipment, enhancing the efficiency of the manufacturing process.

Whether used in microprocessor systems, memory decoders, or data routing applications, the 74AC138MTR by STMicroelectronics delivers performance and reliability in a compact and power-efficient package.