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SN74LVCH245ARGYRG4 Arkusz danych(PDF) 11 Page - Texas Instruments |
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SN74LVCH245ARGYRG4 Arkusz danych(HTML) 11 Page - Texas Instruments |
11 / 37 page DIR OE A1 B1 To Seven Other Channels 1 2 19 18 SN54LVCH245A, SN74LVCH245A www.ti.com SCES008P – JULY 1995 – REVISED JULY 2014 9 Detailed Description 9.1 Overview The SN54LVCH245A octal bus transceiver is designed for 2.7-V to 3.6-V VCC operation, and the SN74LVCH245A octal bus transceiver is designed for 1.65-V to 3.6-V VCC operation. Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators in a mixed 3.3-V/5-V system environment. These devices are designed for asynchronous communication between data buses. These devices transmit data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated. These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input circuit and is not disabled by OE or DIR. 9.2 Functional Block Diagram 9.3 Feature Description • Wide operating voltage range from 1.65 V to 3.6 V • Allows down voltage translation • Inputs accept voltages to 5.5 V • Ioff feature allows voltages on the inputs and outputs when VCC is 0 V 9.4 Device Functional Modes Table 2. Function Table INPUTS OPERATION OE DIR L L B data to A bus L H A data to B bus H X Isolation Copyright © 1995–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: SN54LVCH245A SN74LVCH245A |
Podobny numer części - SN74LVCH245ARGYRG4 |
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Podobny opis - SN74LVCH245ARGYRG4 |
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