LVxT Family of Single Supply Translating Logic Gates

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Compared to other logic families, the LVxT family is the most well-rounded and universal in terms of specifications. The LVxT family of devices combines a reduced input threshold voltage with a wide supply range, allowing for up or down voltage translation with only one power rail. The family has overvoltage-tolerant inputs that allow down translation from up to 5.5 V down to the supply voltage, which can be as low as 1.6 V. The reduced input thresholds allow for up-translation from inputs as low as 2.03 V up to 5-V outputs. See the list below for a summary of common voltage nodes and translation combinations supported.

1.8-V Supply

2.5-V Supply

3.3-V Supply

5.0-V Supply

1.2 V → 1.8 V

1.8 V → 1.8 V

2.5 V → 1.8 V

3.3 V → 1.8 V

5.0 V → 1.8 V

1.8 V → 2.5 V

2.5 V → 2.5 V

3.3 V → 2.5 V

5.0 V → 2.5 V

1.8 V → 3.3 V

2.5 V → 3.3 V

3.3 V → 3.3 V

5.0 V → 3.3 V

2.5 V → 5.0 V

3.3 V → 5.0 V

5.0 V → 5.0 V

1 Advantages of Using the LVxT Gates and Buffers to Translate

https://www.ti.com/logic-voltage-translation/logic-gates/voltage-translating-gates/overview.html

Many Common Functions Supported

The LVxT family includes many common logic gates such as AND, NAND, OR, NOR, XOR, and XNOR functions. We also offer configurable gates that provide the greatest flexibility. See our full portfolio of translating gates here.

Simplified System Design

Because only one supply is required for operation, the LVxT family of logic can be used to reduce the number of supply rails required in some systems.

Reduced Design Size

The LVxT family are available in the surface mount DBV (SOT-23) and DCK (SC70) packages and replace both a logic function and voltage translator reducing BOM count and overall solution size.

No Pull-ups or Pull-downs Required

Unlike open-drain translators, no external resistors are required for voltage translation.

Over-voltage Tolerant Inputs

All LVxT devices support up to 5.5-V input signals independent of supply voltage allowing for simple down-translation.

Mixed Mode Operation

Inputs can be at different voltages, allowing for logic using signals from different voltage domains.

2 Translating Down

Using these parts to translate down is very simple because the inputs are tolerant to 5.5 V, completely independent of supply voltage (V_CC). The input high-state voltage can be any value from the defined minimum input high-state voltage (V_IH) in the datasheet to 5.5 V, including above V_CC.

The output high-level voltage (V_OH) always equals the supply (V_CC) level, which can be as low as 1.6 V. One advantage to down translating using this part is that the I_CC current remains less than or equal to the maximum specified value in the datasheet as long as the input voltage is equal to or larger than the supply voltage. The typical switching thresholds for 3.3-V operation can be seen in Figure 2-1.

Common down translation possibilities with the LVxT family:

1.8-V V_CC: from 2.5 V, 3.3 V, or 5 V down to 1.8 V
2.5-V V_CC: from 3.3 V, to 5 V down to 2.5 V
3.3-V V_CC: from 5 V down to 3.3 V

Figure 2-1 Switching Threshold with 3.3-V Supply (V_CC)

Figure 2-2 Power Consumption when Translating