STMicroelectronics 74LCX139TT Low Voltage Dual 2-to-4 Decoder

The 74LCX139TT from STMicroelectronics is a high-performance, low-voltage dual 2-to-4 line decoder designed to operate over a broad voltage range of 2.0V to 3.6V while providing 5V-tolerant inputs. This integrated circuit (IC) is part of the LCX family, which is known for its low power consumption and high noise immunity equivalent to LS-TTL (Low Power Schottky Transistor-Transistor Logic).

Featuring two independent 2-to-4 decoders in a single package, each decoder has an active LOW enable input (E), two active HIGH select inputs (A and B), and four mutually exclusive outputs (Y0 to Y3). When the enable input is HIGH, all the outputs of the corresponding decoder are forced LOW.

The 74LCX139TT is designed for memory decoding or data-routing applications, where the lack of internal diode clamps on the outputs permits use in systems that require 3-state memory address decoding. The device is also ideal for implementing logic functions due to its flexibility and wide operating voltage range.

One of the notable features of this IC is its power-down high impedance inputs and outputs, which support live insertion. The 5V-tolerant inputs allow the use of this device in mixed-voltage environments, and it is fully compatible with 6T-SRAM and LVCMOS technology levels.

The 74LCX139TT ensures optimal performance with its balanced propagation delays and transition times. It is provided in a TSSOP package, which is widely used in the industry for its space-saving footprint. The device is specified for operation from -40°C to +85°C, making it suitable for a wide range of commercial and industrial applications.

Overall, the STMicroelectronics 74LCX139TT is a versatile and reliable choice for designers looking for a dual 2-to-4 decoder that can work efficiently in low-voltage and mixed-voltage environments, while offering the robustness and performance required for demanding applications.