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SN74VMEH22501 Folha de dados(PDF) 4 Page - Texas Instruments |
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SN74VMEH22501 Folha de dados(HTML) 4 Page - Texas Instruments |
4 / 31 page SN74VMEH22501 SCES357F – JULY 2001 – REVISED FEBRUARY 2010 www.ti.com FUNCTIONAL DESCRIPTION The SN74VMEH22501 is a high-drive (–48/64 mA), 8-bit UBT transceiver containing D-type latches and D-type flip-flops for data-path operation in transparent, latched, or flip-flop modes. Data transmission is true logic. The device is uniquely partitioned as 8-bit UBT transceivers with two integrated 1-bit three-wire bus transceivers. Functional Description for Two 1-Bit Bus Transceivers The OEAB inputs control the activity of the 1B or 2B port. When OEAB is high, the B-port outputs are active. When OEAB is low, the B-port outputs are disabled. Separate 1A and 2A inputs and 1Y and 2Y outputs provide a feedback path for control and diagnostics monitoring. The OEBY inputs control the 1Y or 2Y outputs. When OEBY is low, the Y outputs are active. When OEBY is high, the Y outputs are disabled. The OEBY and OEAB inputs can be tied together to form a simple direction control where an input high yields A data to B bus and an input low yields B data to Y bus. 1-BIT BUS TRANSCEIVER FUNCTION TABLE INPUTS OUTPUT MODE OEAB OEBY L H Z Isolation H H A data to B bus True driver L L B data to Y bus H L A data to B bus, B data to Y bus True driver with feedback path Functional Description for 8-Bit UBT Transceiver The 3A and 3B data flow in each direction is controlled by the OE and direction-control (DIR) inputs. When OE is low, all 3A- or 3B-port outputs are active. When OE is high, all 3A- or 3B-port outputs are in the high-impedance state. FUNCTION TABLE INPUTS OUTPUT OE DIR H X Z L H 3A data to 3B bus L L 3B data to 3A bus The UBT transceiver functions are controlled by latch-enable (LE) and clock (CLKAB and CLKBA) inputs. For 3A-to-3B data flow, the UBT operates in the transparent mode when LE is high. When LE is low, the 3A data is latched if CLKAB is held at a high or low logic level. If LE is low, the 3A data is stored in the latch/flip-flop on the low-to-high transition of CLKAB. The UBT transceiver data flow for 3B to 3A is similar to that of 3A to 3B, but uses CLKBA. 4 Submit Documentation Feedback Copyright © 2001–2010, Texas Instruments Incorporated Product Folder Link(s): SN74VMEH22501 |
Nº de peça semelhante - SN74VMEH22501 |
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Descrição semelhante - SN74VMEH22501 |
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