Electronic Design

Logic-Level Translators Simplify Systems While Maintaining Speed

Flexible bidirectional level translation between 1.5-, 1.8-, 2.5-, 3.3-, and 5-V voltage nodes is possible with a new family of dual-supply-level translation transceivers. Texas Instruments' SN74LVC1T45, SN74LVC2T45, SN74AVC8T245, and SN74AVC-20T245 target mobile consumer, networking, datacom, and computing applications.

Mismatched I/O voltages between microprocessors and peripheral devices continue to occur as microprocessor I/O voltages migrate to lower nodes and peripherals maintain higher voltage nodes. These transceivers also offer full configurability, with each rail configurable from 1.4 to 3.6 V in the AVC technology and 1.65 to 5.5 V in the LVC technology.

The AVC versions feature 12-mA current drive and propagation delays of just 3.5 ns (typ) when translating from 1.8 to 3.3 V. Translators in the LVC technology have a max drive strength of 32 mA and propagation delays of 4 ns (typ) when translating from 3.3 to 5 V.

These devices add further bit width flexibility to TI's existing portfolio by providing 1-, 2-, 8-, and 20-bit wide versions. The new six-pin LVC1T45 and eight-pin LVC2T45 transceivers simplify routing by enabling designers to place a single or a dual translator on the board rather than routing through a higher bit-width device. These transceivers are extremely useful for level shifting control signals from general-purpose I/Os.

Prices for the translators range from $0.40 to $2.50 each in lots of 1000 units.

Texas Instruments

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