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SN74VMEH22501A-EP bảng dữ liệu(PDF) 3 Page - Texas Instruments |
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SN74VMEH22501A-EP bảng dữ liệu(HTML) 3 Page - Texas Instruments |
3 / 27 page SN74VMEH22501AEP 8BIT UNIVERSAL BUS TRANSCEIVER AND TWO 1BIT BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND 3STATE OUTPUTS SCES625 − FEBRUARY 2005 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 terminal assignments 123456 A 1OEBY NC NC NC NC 1OEAB B 1Y 1A GND GND VCC 1B C 2Y 2A VCC VCC BIAS VCC 2B D 3A1 2OEBY GND GND 2OEAB 3B1 E 3A2 LE VCC 3B2 F 3A3 OE VCC 3B3 G 3A4 CLKBA GND GND CLKAB 3B4 H 3A5 3A6 VCC VCC 3B6 3B5 J 3A7 3A8 GND GND 3B8 3B7 K DIR NC NC NC NC VCC NC − No internal connection functional description The SN74CVMEH22501A−EP 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 OUTPUT MODE L H Z Isolation H H A data to B bus True driver L L B data to Y bus True driver H L A data to B bus, B data to Y bus True driver with feedback path GQL PACKAGE (TOP VIEW) 1 23456 A B C D E F G H J K |
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