SP508E Rugged 20Mbps, 8Channel Multi-Protocol Transceiver with ProgrammableDCE/DTE and T erminationResistors FEATURES Now Available in Lead Free Packaging 20Mbps Differential TransmissionRates Referto page7 for pinout 5kV ESD Tolerance for Analog I/Os Internal Transceiver Termination Resistors Easy Flow-Through Pinout for V. /V .35 +5V Only Operation InterfaceModes: Individual Driver/Receiver Enable/DisableControls RS-232 (V.28) EIA-530 (V. 0 &V .) X.2 (V. ) EIA-530A (V. 0 &V .) Operatesin DTE or DCE Mode RS-449/V.36 V .35 APPLICATIONS (V .0 & V. ) Router SoftwareSelectable Protocolswith 3-BitW ord Frame Relay Eight Driversand Eight Receivers CSU V.35/V. Receiver TerminationNetwork DSU DisableOption PBX InternalLine or Digital Loopback Testing Secure Communication Terminals Adheres to NET/NET2 and TBR-2 Requirements 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. receivers are used. The SP508E provides the controls and transceiver availability for operating as either a DTEor 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. 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. ApplicableU.S. Patents-5,306,954 and others patents pending Exar Corporation 48720 KatoRoad, Fremont CA,94538 5 0-668-70 7 www .exar.com SP508E 00 07242 STORAGECONSIDERA TIONS ABSOLUTE MAXIMUM RATINGS Due to the relatively large package size, storage in a low These are stress ratings only and functional operation of the humidity environment is preferred. Large high density plastic device at these ratings or any other above those indicated in packages are moisture sensitive and should be stored in Dry the operation sections of the specicfi ations below is not implied. Vapor Barrier Bags. Prior to usage, the parts should remain Exposure to absolute maximum rating conditions for extended bagged and stored below 40C and 60%RH. If the parts are periodsof time may affect reliability. removed from the bag, they should be used within 48 hours or stored in an environment at or below 20%RH. If the above V .................................................................................................+7V CC conditions cannot be followed, the parts should be baked Input Voltages: for four hours at 25C in order to remove moisture prior to Logic ................................................ -0.3V to(V +0.5V) CC Drivers .............................................. -0.3V to (V +0.5V) soldering. Exar ships the 00-pin LQFP in Dry Vapor Barrier CC Receivers ............................................................. 5.5V Bags with a humidity indicator card and desiccant pack. The Output Voltages: humidityindicator should be below 30%RH. Logic ................................................ -0.3Vto (V +0.5V) CC Drivers ....................................................-7.5V to + 2.5V Receivers ......................................... -0.3V to(V +0.5V) CC Storage Temperature ..................................................-65C to +50C Power Dissipation ................................................................... 520mW (derate9.0mW/C above +70C) Package Derating: ...................................................................52.7 C/W JA .....................................................................6.5 C/W JC ELECTRICAL SPECIFICATIONS T = -40C to +85C andV = +4.75V to +5.25V unless otherwise noted. Typical values are for T = 25C andVcc = 5V. A CC A PARAMETER MIN. TYP. MAX. UNITS CONDITIONS LOGIC INPUTS V 0.8 Volts IL V 2.0 Volts IH LOGICOUTPUTS V 0.4 Volts I = 3.2mA OL OUT V 2.4 Volts I = .0mA OH OUT V.28 DRIVER DC Parameters Outputs Open Circuit Voltage 5 Volts per Figure Loaded Voltage 5.0 5 V olts per Figure 2 Short-CircuitCurrent 00 mA per Figure 4, V =0V OUT Power-Off Impedance 300 per Figure 5 AC Parameters Outputs Transition Time .5 s per Figure 6 +3Vto -3V Instantaneous Slew Rate 30 V/s per Figure3 Propagation Delay t 0.5 5 s PHL t 0.5 5 s PLH Max.Transmission Rate 20 230 kbps V.28 RECEIVER DC Parameters Inputs Input Impedance 3 7 k per Figure 7 Open-Circuit Bias +2.0 V olts per Figure 8 HIGH Threshold .7 3.0 Volts LOW Threshold 0.8 .2 Volts ACParameters Propagation Delay t 50 00 500 ns PHL t 50 00 500 ns PLH Exar Corporation 48720 KatoRoad, Fremont CA, 94538 5 0-668-70 7 www.exar.com SP508E 00 0724 2 2