®
SP508
Rugged 20Mbps, 8 Channel Multi-Protocol Transceiver
with Programmable DCE/DTE and Termination Resistors
FEATURES
Now Available in Lead Free Packaging
■ 20Mbps Differential Transmission Rates
■ 15kV ESD Tolerance for Analog I/Os
■ Internal Transceiver Termination Resistors
for V.11/V.35
Refer to page 7 for pinout
■ Easy Flow-Through Pinout
■ +5V Only Operation
■ Interface Modes:
■ Individual Driver/Receiver Enable/Disable Controls
■ Operates in DTE or DCE Mode
■ RS-232 (V.28)
■ X.21 (V.11)
■ RS-449/V.36
(V.10 & V.11)
■ EIA-530 (V.10 & V.11)
■ EIA-530A (V.10 & V.11)
■ V.35
APPLICATIONS
■ Router
■ Software Selectable Protocols with 3-Bit Word
■ Eight Drivers and Eight Receivers
■ Frame Relay
■ CSU
■ V.35/V.11 Receiver Termination Network
■ DSU
Disable Option
■ PBX
■ Internal Line or Digital Loopback Testing
■ Secure Communication Terminals
■ Adheres to NET1/NET2 and TBR-2 Requirements
DESCRIPTION
The SP508 is a monolithic device that supports eight (8) popular serial interface standards for
Wide Area Network (WAN) connectivity. The SP508 is fabricated using a low power BiCMOS
process technology, and incorporates a Sipex regulated charge pump allowing +5V only
operation. Sipex'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)
receiverscanbeconfiguredviasoftwareforanyoftheaboveinterfacemodesatanytime. The
SP508 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
necessaryterminationisintegratedwithintheSP508andisswitchablewhenV.35driversand
V.35 receivers, or when V.11 receivers are used. The SP508 provides the controls and
transceiver availability for operating as either a DTE or DCE.
Additional features with the SP508 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 SP508 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 SP508 include separate enable pins for added convenience. The
SP508 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
Date: 8/19/04
SP508 Enhanced WAN Multi–Protocol Serial Transceiver
© Copyright 2004 Sipex Corporation
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