SN74AHC138PWRG4

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Logic-signal switches, multiplexers and decoders are key building blocks in electronics today, used in various applications from basic to complex. One such key component is the SN74AHC138PWRG4 model by Texas Instruments, which is a 3-to-8 line decoder with Schmitt 3-state buffer control pins. It is typically used to select one of eight data lines to be enabled on the output, and can provide logic level translation from high-speed logic families such as TTL to low-level current sinking logic. In this article, we’ll look at the application fields, the working principles and some of the technical specs of this IC.

Application Fields

The SN74AHC138PWRG4 decoder is a versatile and highly reliable device. Its primary application field is in consumer electronics and industrial applications that require precise logic level translation. Some of the consumer applications it can be used for include automotive infotainment, consumer IoT, and smart home electronics. Its industrial applications include computer peripherals, automotive systems, and instrumentation systems. It is also used in 5G radios and servers, as well as specialized aerospace systems.

As this device supports the logic level translation between high-speed logic families such as TTL and low-level current sinking logic, it is being used in a wide range of devices to improve signal integrity. It can be used to control digital inputs and outputs, as well as act as a signal interface between digital and analog systems. It is also used as address decoders in memory modules, bus decoders, and address drivers in data communication devices.

Working Principle

The SN74AHC138PWRG4 decoder consists of three independently enabled 2 to 4 line decoders and a Schmitt 3-state buffer control pin. It has three control pins - A, B, C, and eight data pins - Y0 to Y7. When a logic level is received on any of the control pins, the decoder will set one of the data pins to a logic \'1\' state. Each input has its own logical threshold, and the active input is determined by a weighted voting system.

The decoder also includes Schmitt 3-state buffer control pins which can be used to adjust the logic voltage level according to need. These pins can be used to improve signal integrity, as it provides level shifting between high-speed logic families such as TTL and low-level current sinking logic.

Technical Specifications

The SN74AHC138PWRG4 model is a 3-to-8 line decoder with Schmitt 3-state buffer control pins. It has a voltage supply range of 1.8V to 6V, and a typical power consumption of 5.6mW. Its switching times range from 7ns to 13ns, depending on the input logic levels. It has an input logic high voltage of 0.8V, and an input logic low voltage of 0.2V.

It has an operating temperature range of 0 to 70°C (with derating of 0.1V/°C from 25 to 70°C), and can withstand a maximum of up to 85°C. Its package is SOP (SOIC-14) and its weight is 1.08g. Its maximum ESD durability for human body model is 2kV. It also has a noise immunity of 0.5V, and has a noise margin of 1.3V at 1.5ns.

The SN74AHC138PWRG4 by Texas Instruments is a versatile and reliable 3-to-8 line decoder. It is the perfect solution for applications that require precise logic level translation and output control. Its primary application fields are consumer electronics and industrial applications, and it is also being used in 5G radios and servers, as well as specialized aerospace systems. Its features also make it ideal as an address decoder and bus interface in memory modules and data communication devices. The device is suitable for use in all 3.3V, 5V and 12V applications.

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