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SN74AHC245-Q1 데이터시트(PDF) 10 Page - Texas Instruments |
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SN74AHC245-Q1 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 32 page DIR OE A1 B1 To Seven Other Channels 1 2 19 18 SN54AHC245, SN74AHC245 SCLS230J – OCTOBER 1995 – REVISED JULY 2014 www.ti.com 9 Detailed Description 9.1 Overview These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements. The SNx4AHC245 devices allow data transmission 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 that the buses are effectively isolated. 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. 9.2 Functional Block Diagram 9.3 Feature Description • VCC is optimized at 5 V • Allows down voltage translation from 5 V to 3.3 V – Inputs accept voltage levels up to 5.5 V • Slow edge rates minimize output ringing 9.4 Device Functional Modes Table 1. Function Table (Each Transceiver) INPUTS OPERATION OE DIR L L B data to A bus L H A data to B bus H X Isolation 10 Submit Documentation Feedback Copyright © 1995–2014, Texas Instruments Incorporated Product Folder Links: SN54AHC245 SN74AHC245 |
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