SP508E数据手册集成电路（IC）的驱动器接收器收发器规格书PDF

描述 Description

The SP508E is a monolithic device that supports eight (8) popular serial interface standards for Wide Area Network (WAN) connectivity. The SP508E is fabricated using a low power BiCMOS process technology, and incorporates an Exar regulated charge pump allowing +5V only operation. Exar's patented charge pump provides a regulated output of +5.8V, which will provide enough voltage for compliant operation in all modes. Eight (8) drivers and eight (8) receivers can be configured via software for any of the above interface modes at any time. The SP508E requires no additional external components for compliant operation for all of the eight (8) modes of operation other than four capacitors used for the internal charge pump. All necessary termination is integrated within the SP508E and is switchable when V.35 drivers and V.35 receivers, or when V.11 receivers are used. The SP508E provides the controls and transceiver availability for operating as either a DTE or DCE.
Additional features with the SP508E include internal loopback that can be initiated in any of the operating modes by use of the LOOPBACK pin. While in loopback mode, receiver outputs are internally connected to driver inputs creating an internal signal path bypassing the serial communications controller for diagnostic testing. The SP508E also includes a latch enable pin with the driver and receiver address decoder. The internal V.11 or V.35 receiver termination can be switched off using a control pin (TERM_OFF) for monitoring applications. All eight (8) drivers and receivers in the SP508E include separate enable pins for added convenience. The SP508E is ideal for WAN serial ports in networking equipment such as routers, access concentrators, network muxes, DSU/CSU's, networking test equipment, and other access devices.
Applicable U.S. Patents-5,306,954; and others patents pending.
For technical support or help choosing a product please email Exar’s Serial Technical Support group at:  serialtechsupport@exar.com.

特性 Features

·20Mbps Differential Transmission Rates
·15kV ESD Tolerance for Analog I/Os
·Internal Transceiver Termination Resistors for V.11/V.35
·Interface Modes:·RS-232 (V.28)
·EIA-530 (V.10 & V.11)
·X.21 (V.11)
·EIA-530A (V.10 & V.11)
·RS-449/V.36 – V.35 (V.10 & V.11)

·Software Selectable Protocols with 3-Bit Word
·Eight Drivers and Eight Receivers
·V.35/V.11 Receiver Termination Network Disable Option
·Internal Line or Digital Loopback Testing
·Adheres to NET1/NET2 and TBR-2 Requireme
·Easy Flow-Through Pinout
·+5V Only Operation
·Individual Driver/Receiver Enable/Disable Controls
·Operates in DTE or DCE Mode

应用 Application

·Router
·Frame Relay
·CSU
·DSU
·PBX
·Secure Communication Terminals