74AC138SC – FSC

Overview

The onsemi 74AC138SC is a high-speed CMOS 1-of-8 decoder/demultiplexer designed for efficient address decoding and data routing in complex digital systems. Its primary function is to select one of eight outputs based on a 3-bit binary input, with enable inputs providing further control. A critical design consideration for this device is managing the propagation delay from input assertion to output selection, which, while optimized in the AC family, can still impact system clock margins in ultra-high-speed applications, necessitating careful timing analysis.

Key Features

• Type: Decoder/Demultiplexer (1 x 3:8)
• Supply Voltage Range: 2V to 6V
• Output Current: 24mA (High/Low)
• Operating Temperature: -40°C to 85°C
• Package: 16-SOIC (0.154″ width)
• Mounting Type: Surface Mount

Applications

The component is engineered for deployment in systems requiring high reliability and performance under specific operating conditions. It provides functional stability across the stated design envelope.

• Address decoding for memory arrays and peripheral selection
• Data routing in multiplexed bus architectures
• Control signal generation for state machines
• Output enable control for multiple peripheral devices