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SN74F2245DBR データシート(PDF) 1 Page - Texas Instruments |
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SN74F2245DBR データシート(HTML) 1 Page - Texas Instruments |
1 / 11 page SN74F2245 25 Ω OCTAL BUS TRANSCEIVER WITH 3STATE OUTPUTS SDFS099 − MAY 1995 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 D 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers D Package Options Include Plastic Small-Outline (DB) Packages and Plastic 300-mil DIPs (N) description The SN74F2245 is designed for asynchronous communication between data buses. The devices transmit data 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 disables the device so the buses are effectively isolated. Both A and B outputs can sink up to 12 mA; 25- Ω resistors are included in the lower output circuit to reduce overshoot and undershoot. The SN74F2245 is characterized for operation from 0 °C to 70°C. 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 symbol† logic diagram (positive logic) A5 6 A6 7 A7 8 A8 9 A2 3 A3 4 A4 5 OE A1 2 G3 19 3EN2[AB] B5 14 B6 13 B7 12 B8 11 B1 18 B2 17 B3 16 B4 15 3EN1[BA] 1 DIR DIR OE A1 B1 1 2 18 19 To Seven Other Channels 1 2 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 DIR A1 A2 A3 A4 A5 A6 A7 A8 GND VCC OE B1 B2 B3 B4 B5 B6 B7 B8 DB OR N PACKAGE (TOP VIEW) PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 1995, Texas Instruments Incorporated |
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