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XRT4500CV Datasheet(PDF) 11 Page - Exar Corporation |
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XRT4500CV Datasheet(HTML) 11 Page - Exar Corporation |
11 / 99 page XRT4500 áç áç áç áç MULTIPROTOCOL SERIAL NETWORK INTERFACE IC REV. 1.0.7 8 PIN DESCRIPTIONS (CONT.) NOTE: Signal names beginning with D_ are digital signals. NOTE: Signal names ending with B and A are the positive and negative polarities of differential signals respectively. PIN # Signal DTE MODE DCE MODE TYPE FUNCTION 18 LP I Loopback Command Input Pin – Active Low: This active-low input pin permits the user to configure the XRT4500 into a “Loop-Back” Mode. The exact loop-back will depend upon whether the XRT4500 is operating in the DTE or DCE Modes. Setting this input pin to “LOW” enables the Loop-back Operation. Setting this input pin to “HIGH” disables the Loop-back Operation. This input pin contains an Internal 20K Ω pull-up to VDD. 19 TX8O RLA RIA O Transmitter 8 – Single Ended Data Output to Line The XRT4500 accepts a TTL level binary data stream, from the local terminal equipment via the “TX8D” input pin (pin 17), and outputs it, in either a V.10 or V.28 manner via this output pin. The exact role that this output pin plays depends upon whether the XRT4500 is operating in the DTE or DCE Modes. If the XRT4500 is configured to operate in the DCE Mode: This output pin will typically drive the state of either the “RI” (Ring Indicator) or “TM” (Test Mode) signals to the Remote Terminal Equipment. If the XRT4500 is configured to operate in the DTE Mode: This output pin will typically drive the state of the “RL” (Remote Loop-back) signal to the Remote Terminal Equipment. 20 VDD Analog VDD – For Receivers 4, 5, 6, 7 and 8. 21 CPP Charge Pump Capacitor Pin: A 2.2µF tantalum capacitor must be connected between pin 21 and pin 22. 22 CPM Charge Pump Capacitor Pin: A 2.2µF tantalum capacitor must be connected between pin 21 and pin 22. |
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