The IDT74FCT138ATSO is a high-speed CMOS 3-to-8 line decoder/demultiplexer manufactured by Integrated Device Technology (IDT). This device accepts three binary address inputs (A0-A2) and, depending on the input, activates one of the eight output lines (Y0-Y7). The device also features three enable inputs (E1, E2, and E3), which must be at their active levels for the device to operate. This makes it ideal for memory chip selection, address decoding, and data routing applications.

Applications

• Memory chip selection
• Address decoding in microprocessor systems
• Data routing and distribution
• Logic decoding and control circuits
• Instrumentation and test equipment

Features

• High-speed operation: Provides fast decoding and demultiplexing with minimal propagation delay.
• CMOS technology: Low power consumption for energy-efficient operation.
• 3-to-8 line decoding: Decodes three binary address inputs into eight mutually exclusive outputs.
• Three enable inputs: Allows for cascading or parallel expansion to decode larger address ranges.
• Active-low outputs: Output lines are active low, simplifying interface with other logic devices.
• Multiple package options: Available in various package types, including SOIC, for flexible mounting options.
• TTL compatible inputs: Compatible with TTL logic levels, facilitating integration with existing systems.

Benefits

• Improved system performance: High-speed operation minimizes decoding delays, improving overall system speed.
• Reduced power consumption: CMOS technology reduces power dissipation, extending battery life in portable applications.
• Simplified system design: 3-to-8 line decoding reduces the number of components required for address decoding.
• Increased system flexibility: Enable inputs allow for cascading and expansion to decode larger address ranges.
• Easy integration: TTL compatible inputs simplify interface with other logic devices.

Additional Details

The IDT74FCT138ATSO is typically packaged in a Small Outline Integrated Circuit (SOIC) package. The 'TSO' suffix generally refers to the package type (Thin Small Outline). It operates over a standard temperature range. It requires a 5V power supply. Datasheets are available from IDT (now Renesas) that provide detailed electrical characteristics, timing diagrams, and application information, including propagation delays and power consumption specifics.