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SN74AVC2T45DCUTE4 Datasheet(PDF) 2 Page - Texas Instruments |
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SN74AVC2T45DCUTE4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 24 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) B1 DIR 5 7 A1 2 VCCA VCCB B2 6 A2 3 SN74AVC2T45 DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS SCES531J – DECEMBER 2003 – REVISED JUNE 2007 The SN74AVC2T45 is designed for asynchronous communication between two data buses. The logic levels of the direction-control (DIR) input activate either the B-port outputs or the A-port outputs. The device transmits data from the A bus to the B bus when the B-port outputs are activated and from the B bus to the A bus when the A-port outputs are activated. The input circuitry on both A and B ports always is active and must have a logic HIGH or LOW level applied to prevent excess ICC and ICCZ. The SN74AVC2T45 is designed so that the DIR input is powered by VCCA. This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. The VCC isolation feature ensures that if either VCC input is at GND, both ports are in the high-impedance state. NanoFree™ package technology is a major breakthrough in IC packaging concepts, using the die as the package. FUNCTION TABLE(1) (EACH TRANSCEIVER) INPUT OPERATION DIR L B data to A bus H A data to B bus (1) Input circuits of the data I/Os always are active. LOGIC DIAGRAM (POSITIVE LOGIC)(1) (1) Pin numbers are for the DCT and DCU packages only. 2 Submit Documentation Feedback |
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