XRT4500 Datasheet | Exar

.. áç SEPTEMBER 2002 MULTIPROTOCOL SERIAL NETWORK INTERFACE IC REV. 1.0.7 GENERAL DESCRIPTION The XRT4500 is a fully integrated multiprotocol serial interface. It supports all of the popular serial munication interface standards such as ITU-T V.35, ITUT V.36, EIA530A, RS232 (ITU-T V.28), ITU-T X.21 and RS449. It can easily be interfaced with most mon types of Serial munications Controllers (SCCs). This device contains eight receivers and eight transmitters, in groups of six or seven. It is a plete solution containing all of the required source and load termination resistors in one 80-pin TQFP package. The XRT4500 operates at higher speeds (20MHz for V.35 and 256kbps for V.28). The XRT4500 can be configured to operate in one of the seven interface standards in either DTE, or DCE modes of operation and power down mode. It fully supports echoed clock as well as clock and data inversion. Loopbacks are supported in DTE and DCE modes of operation. This feature eliminates the need for external circuitry for loopback implementation. Control signals such as RI, RL, DCD, DTR, DSR are protected against glitches by internal filters. These filters can be turned off. The XRT4500 provides an internal oscillator (clock signal) which can be used to conduct standalone diagnostics of DTE equipment. BLOCK DIAGRAM Electrical Interfaces V.10, V.11, V.35, V.28 High Speed Transceiver RX1 TX1 Features - Pin Programmable Multiprotocol Serial Interface - V.35, V.36, EIA-530 A, RS232 (V.28), V.10, V.11, X.21 and RS449 munication Interface Standards - V.28, V.10, V.11 and V.35 Electrical Interfaces are ‘CTR2’ pliant - Contains On-Chip Source and Load Termination Resistors - Contains Eight Receivers and Eight Transmitters with Switchable DTE and DCE Modes - Glitch Filters on the Control Signals (Selectable) - +5V Single Power Supply with internal DC-DC Converter - Full Support of Loopbacks, Data & Clock Inversion, and Echoed Clock in DTE and DCE...