SN74AVC8T245PWE4

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Logic - Translators, Level Shifters

The SN74AVC8T245PWE4 from Texas Instruments is a high-speed low-voltage, level shifter. It enables the simultaneous unidirectional voltage level translation between two different voltage domains. The best application example is the level shifting between a single 1.8V digital logic signal and a 3.3V digital logic signal. The two logic input and two logic output banks have 3-state outputs and can both be active at the same time. The logic inputs that appear in the 1.8V bank are connected to inputs in the 3.3V bank. The SN74AVC8T245PWE4 provides an easy-to-use interface and allows simple logic level translation. The logic type determines both the active speed and the total propagation delay.

The logic type is determined by the power supply voltage and the voltage thresholds used by the CMOS logic family. The power supply voltage determines the linear transfer character of the signal. The signal input and output levels must match the voltage thresholds of the corresponding CMOS logic family. The latest CMOS technology uses very low power levels, so in theory this device can support any power supply range from 1.8V to 5.5V.

The SN74AVC8T245PWE4 supports complementary control with two logic levels. These can be input as high or low. It also supports high-impedance control. This provides an interface between two systems with different ground and power levels. The device also incorporates a three-state output buffer with an on/off switch. This switch is used to turn off the output buffer, which isolates the output terminal from the rest of the chip.

The SN74AVC8T245PWE4 can be used as a bi-directional translator, because it supports level shifts both in the positive direction (1.8V to 3.3V) and in the negative direction (3.3V to 1.8V). The direction of the level conversion is indicated by an input control that is asserted either high or low. When the control line is asserted low, three-state mode is enabled in the 1.8V domain. This allows external control signals to override the default output setting. This translator is ideal for applications that require a level shift between two different digital logic domains.

To ensure the desired level of switching performance, the SN74AVC8T245PWE4 incorporates a slew rate limiter. This eliminates ringing and reduces power consumption by limiting the amount of current that can be pulled through the logic outputs. The device also includes a 5V tolerant input, so it can be powered from either a 1.8V or 3.3V power source. The SN74AVC8T245PWE4 supports switching speeds of up to 30 MHz and provides robust noise immunity. It is available in a variety of commercial and industrial temperature ranges.

The SN74AVC8T245PWE4 is a versatile logic level translator that provides an easy-to-use and robust way to interface between two digital logic domains with different voltage thresholds. It enables level shifting in both directions, provides robust switching performance with its slew rate limiter and 5V tolerant input. It is available in a variety of temperature ranges to suit different applications.

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