1

Date: 1/19/05

SP508 Enhanced WAN Multi–Protocol Serial Transceiver

© Copyright 2005 Sipex Corporation

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 Requirements

SP508

Rugged 20Mbps, 8 Channel Multi-Protocol Transceiver

with Programmable DCE/DTE and Termination Resistors

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)

receivers can be configured via software for any of the above interface modes at any time. 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

necessary termination is integrated within the SP508 and is switchable when V.35 drivers and

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

®

APPLICATIONS

■ Router

■ Frame Relay

■ CSU

■ DSU

■ PBX

■ Secure Communication Terminals

■ Easy Flow-Through Pinout

■ +5V Only Operation

■ Individual Driver/Receiver Enable/Disable Controls

■ Operates in DTE or DCE Mode

Now Available in Lead Free Packaging

Refer to page 7 for pinout