ON Semiconductor MM74HCT138MTC 3-to-8 Line Decoder/Demultiplexer

The ON Semiconductor MM74HCT138MTC is a high-performance, 3-to-8 line decoder/demultiplexer integrated circuit that is designed to address the needs of modern digital systems. This device is part of the HCT (High-Speed CMOS TTL-Compatible) family, which ensures compatibility with older TTL logic while providing the benefits of CMOS technology, such as low power consumption and reduced noise.

Key Features

• Logic Type: 3-to-8 Line Decoder/Demultiplexer
• Supply Voltage Range: 4.5V to 5.5V
• High-Speed CMOS Technology: Ensures fast switching and TTL compatibility
• Multiple Input Enable Lines: Three enable inputs (two active-low and one active-high) for easy expansion and parallel cascading
• Low Quiescent Current: Ideal for battery-operated applications
• Output Drive Capability: Capable of driving 10 LS-TTL loads
• Package Type: TSSOP-16 (Thin Shrink Small Outline Package)

Product Description

The MM74HCT138MTC from ON Semiconductor is a versatile device that can be used to decode binary information from a 3-bit input to one of eight output lines. It is particularly useful in applications where a low-power, high-speed decoder is required to select memory addresses, enable specific peripheral devices, or for general decoding purposes.

This decoder/demultiplexer features an active-low enable (G1) and an active-high enable (G2A), along with an additional active-low enable (G2B), providing flexible control options. When the enable conditions are met, the selected output will go low while the remaining outputs stay high. This allows for the direct connection to the inputs of devices with active-low enable inputs without the need for external inverters.

The MM74HCT138MTC operates over a broad voltage range from 4.5V to 5.5V, making it compatible with most 5V systems. Its low quiescent current makes it suitable for battery-operated devices. The TSSOP-16 package is compact and space-saving, which is ideal for applications with limited PCB real estate.

With its combination of high-speed operation, low power consumption, and robust output drive capability, the MM74HCT138MTC is a reliable choice for system designers looking to implement efficient decoding functions in their digital systems.