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74LCX646MSA bảng dữ liệu(PDF) 3 Page - Fairchild Semiconductor |
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74LCX646MSA bảng dữ liệu(HTML) 3 Page - Fairchild Semiconductor |
3 / 10 page 3 www.fairchildsemi.com Functional Description In the transceiver mode, data present at the HIGH imped- ance port may be stored in either the A or B register or both. The select (SAB, SBA) controls can multiplex stored and real-time. The examples shown below demonstrate the four fundamental bus-management functions that can be performed. The direction control (DIR) determines which bus will receive data when OE is LOW. In the isolation mode (OE HIGH), A data may be stored in one register and/or B data may be stored in the other register. When an output func- tion is disabled, the input function is still enabled and may be used to store and transmit data. Only one of the two busses, A or B, may be driven at a time. Real-Time Transfer Bus B to Bus A Real-Time Transfer Bus A to Bus B Transfer Storage Data to A or B Storage OE DIR CPAB CPBA SAB SBA LL X X X L OE DIR CPAB CPBA SAB SBA LH X X L X OE DIR CPAB CPBA SAB SBA LL X H or L X H LH H or L X H X OE DIR CPAB CPBA SAB SBA LH XL X LL X XL HX XX X HX X XX |
Số phần tương tự - 74LCX646MSA |
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Mô tả tương tự - 74LCX646MSA |
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