MC74LCX138DTG

The MC74LCX138DTG from ON Semiconductor is a versatile 3-to-8 decoder/demultiplexer designed for low-voltage CMOS applications. It operates across a wide supply voltage range of 1.65V to 5.5V, making it suitable for various system designs. The device features 5V tolerant inputs, enabling seamless interface capability with 5V TTL logic.

This decoder/demultiplexer accepts three binary weighted inputs (A0, A1, A2) and provides eight mutually exclusive active-LOW outputs (O0-O7) when enabled. It includes three enable inputs: two active-LOW (E1, E2) and one active-HIGH (E3). This configuration allows for easy parallel expansion to create larger decoders, such as a 1-of-32 decoder using multiple devices. The MC74LCX138DTG can also function as an 8-output demultiplexer by utilizing the enable inputs for data and strobing.

With a balanced output sink and source capability of 24mA at 3V, the MC74LCX138DTG offers robust performance. It operates within a temperature range of -40°C to 85°C and is available in a 16-TSSOP surface mount package. The device also boasts near-zero static supply current, contributing to reduced system power requirements. Its high-speed operation and LVTTL/LVCMOS compatibility make it ideal for memory address decoding and other TTL level bus-oriented applications.