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SP3508EB Datasheet(PDF) 32 Page - Exar Corporation |
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SP3508EB Datasheet(HTML) 32 Page - Exar Corporation |
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32 / 36 page  32 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3508_00_072208 TERM_OFF FUNCTION The SP3508 contains a TERM_OFF pin that disables all three receiver input termination networks regardless of mode. This allows the device to be used in monitor mode ap- plications typically found in networking test equipment. The TERM_OFF pin internally contains a pull-down device with an impedance of over 500kΩ, which will default in a "ON" condition during power-up if V.35 receivers enable line and the SHUTDOWN mode from the decoder will disable the termination regard- less of TERM_OFF. LOOPBACK FUNCTION The SP3508 contains a LOOPBACK pin that invokes a loopback path.This loopback path is illustrated in Figure 50. LOOPBACK has an internal pull-up resistor that defaults to normal mode during power up or if the pin is left floating. During loopback, the driver out- put and receiver input characteristics will still adhere to its appropriate specifications. DECODER AND D_LATCH FUNCTION The SP3508 contains a D_LATCH pin that latches the data into the D0, D and D2 decoder inputs. If tied to a logic LOW ("0"), the latch is transparent, allowing the data at the decoder inputs to propagate through and program the SP3508 accordingly. If tied to a logic HIGH ("1"), the latch locks out the data and prevents the mode from changing until this pin is brought to a logic LOW. FEATURES There are internal pull-up devices on D0, D and D2, which allow the device to be in SHUTDOWN mode ("111") upon power up. However, if the device is powered-up with the D_LATCH at a logic HIGH, the decoder state of the SP3508 will be undefined. CTR1/CTR2 EUROPEAN COMPLIANCY As with all of Exar's previous multi-protocol serial transceiver IC's the drivers and re- ceivers have been designed to meet all the requirements to NET/NET2 and TBR2 in order to meet CTR/CTR2 compliancy. The SP3508 is also tested in-house at Exar and adheres to all the NET/2 physical layer testing and the ITU Series V specifications before shipment. Please note that although the SP3508, as with its predecessors, ad- here to CRT/CTR2 compliancy testing, any complex or usual configuration should be double-checked to ensure CTR/CTR2 compliance. Consult the factory for details. |
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