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SN74AVC2T245RSWR データシート(PDF) 2 Page - Texas Instruments |
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SN74AVC2T245RSWR データシート(HTML) 2 Page - Texas Instruments |
2 / 15 page DESCRIPTION/ORDERING INFORMATION (CONTINUED) DIR1 A1 OE B1 SN74AVC2T245 SCES692 – JUNE 2008...................................................................................................................................................................................................... www.ti.com The SN74AVC2T245 is designed for asynchronous communication between two data buses. The logic levels of the direction-control (DIR) input and the output-enable (OE) activate either the B-port outputs or the A-port outputs or place both output ports into the high-impedance mode . 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 SN74AVC2T245 is designed so that the control pins (DIR1, DIR2, and OE) are supplied 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. To ensure the high-impedance state during power up or power down, OE must be connected to VCC through a pull-up resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. FUNCTION TABLE(1) (EACH TRANSCEIVER) CONTROL INPUTS OUTPUT CIRCUITS OPERATION OE DIR1 A PORT B PORT L L Enabled Hi-Z B data to A data L H Hi-Z Enabled A data to B data H X Hi-Z Hi-Z Isolation (1) Input circuits of the data I/Os are always active. LOGIC DIAGRAM (POSITIVE LOGIC)(1) (1) Shown for a single channel 2 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): SN74AVC2T245 |
同様の部品番号 - SN74AVC2T245RSWR |
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同様の説明 - SN74AVC2T245RSWR |
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