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SN74HC245NSR 数据表(PDF) 8 Page - Texas Instruments |
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SN74HC245NSR 数据表(HTML) 8 Page - Texas Instruments |
8 / 29 page DIR OE A1 B1 1 2 18 19 To Seven Other Channels SN54HC245, SN74HC245 SCLS131E – DECEMBER 1982 – REVISED SEPTEMBER 2015 www.ti.com 8 Detailed Description 8.1 Overview These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements. The SNx4HC245 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. 8.2 Functional Block Diagram Logic Diagram (Positive Logic) 8.3 Feature Description The SNx4HC245 devices have a wide operating VCC range from 2 V to 6 V with slower edge rates to minimize output ringing. 8.4 Device Functional Modes Table 1 lists the function modes of the SNx4HC245. Table 1. Function Table INPUTS OPERATION OE DIR L L B data to A bus L H A data to B bus H X Isolation 8 Submit Documentation Feedback Copyright © 1982–2015, Texas Instruments Incorporated Product Folder Links: SN54HC245 SN74HC245 |
类似零件编号 - SN74HC245NSR |
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类似说明 - SN74HC245NSR |
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