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SN74LV4T125RGYR Datasheet(PDF) 10 Page - Texas Instruments |
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SN74LV4T125RGYR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 25 page 1OE 1A 2OE 2A 1Y 2Y 3OE 3A 4OE 4A 3Y 4Y SN74LV4T125 SCLS749B – FEBRUARY 2014 – REVISED SEPTEMBER 2014 www.ti.com 9 Detailed Description 9.1 Overview The SN74LVxTxx family was created to allow up- or down-voltage translation with only one power rail. The family has over-voltage tolerant inputs that allow down translation from up to 5.5 V to the VCC level that can be as low as 1.8 V. The family SN74LVxTxx also has a lowered switching threshold that allows it to translate up to the VCC level that can be as high as 5.5 V. 9.1.1 Translating Down Using these parts to translate down is very simple. Because the inputs are tolerant to 5.5 V at any valid VCC, they can be used to down translate. The input can be any level above VCC up to 5.5 V and the output will equal the VCC level, which can be as low as 1.8 V. One important advantage to down translating using this part is that the ICC current will remain less than or equal to the specified value. Down translation possibilities with SN74LVxTxx: • With 1.8-V VCC from 2.5 V, 3.3 V, or 5 V down to 1.8 V. • With 2.5-V VCC from 3.3 V or 5 V down to 2.5 V. • With 3.3-V VCC from 5 V down to 3.3 V. 9.1.2 Translating Up Using the SN74LVxTxx family to translate up is very simple. The input switching threshold is lowered so the high level of the input voltage can be much lower than a typical CMOS VIH. For instance, If the VCC is 3.3 V then the typical CMOS switching threshold would be VCC / 2 or 1.65 V. This means the input high level must be at least VCC × 0.7 or 2.31 V. On the LVxT devices the input threshold for 3.3-V VCC is approximately 1 V. This allows a signal with a 1.8-V VIH to be translated up to the VCC level of 3.3 V. Up translation possibilities with SN74LVxTxx: • With 2.5-V VCC from 1.8 V to 2.5 V. • With 3.3-V VCC from 1.8 V or 2.5 V to 3.3 V. • With 5-V VCC From 2.5 V or 3.3 V to 5 V. 9.2 Functional Block Diagram 10 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: SN74LV4T125 |
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