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SN74ALS245ADWRE4 数据表(PDF) 2 Page - Texas Instruments |
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SN74ALS245ADWRE4 数据表(HTML) 2 Page - Texas Instruments |
2 / 22 page SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS272A – NOVEMBER 1994 – REVISED JANUARY 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information(continued) These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements. The devices allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending upon 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. The -1 version of the SN74ALS245A is identical to the standard version, except that the recommended maximum IOL is increased to 48 mA. There is no -1 version of the SN54ALS245A. FUNCTION TABLE INPUTS OPERATION OE DIR OPERATION L L B data to A bus L H A data to B bus H X Isolation logic diagram, each gate (positive logic) DIR OE A1 B1 1 2 18 19 To Seven Other Channels absolute maximum ratings over operating free-air temperature range (SN54ALS245A, SN74ALS245A) (unless otherwise noted)† Supply voltage, VCC 7 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage, VI: All inputs 7 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I/O ports 5.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Package thermal impedance, θJA (see Note 1): DB package 70 °C/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DW package 58 °C/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N package 69 °C/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NS package 60 °C/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range –65 °C to 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: The package thermal impedance is calculated in accordance with JESD 51-7. |
类似零件编号 - SN74ALS245ADWRE4 |
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类似说明 - SN74ALS245ADWRE4 |
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