SP508E 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 Refer to page 7 for pinout 15kV ESD Tolerance for Analog I/Os Internal Transceiver Termination Resistors Easy Flow-Through Pinout for V.11/V.35 +5V Only Operation Interface Modes: Individual Driver/Receiver Enable/Disable Controls RS-232 (V.28) EIA-530 (V.10 & V.11) X.21 (V.11) EIA-530A (V.10 & V.11) Operates in DTE or DCE Mode RS-449/V.36 V.35 APPLICATIONS (V.10 & V.11) Router Software Selectable Protocols with 3-Bit Word Frame Relay Eight Drivers and Eight Receivers 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 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 SP508E 101 013020 1STORAGE CONSIDERATIONS 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 specifications 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 periods of 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 125C 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 100-pin LQFP in Dry Vapor Barrier CC Receivers .............................................................15.5V Bags with a humidity indicator card and desiccant pack. The Output Voltages: humidity indicator should be below 30%RH. Logic ................................................ -0.3V to (V +0.5V) CC Drivers ....................................................-7.5V to +12.5V Receivers ......................................... -0.3V to (V +0.5V) CC Storage Temperature ..................................................-65C to +150C Power Dissipation ...................................................................1520mW (derate 19.0mW/C above +70C) Package Derating: ...................................................................52.7 C/W JA .....................................................................6.5 C/W JC ELECTRICAL SPECIFICATIONS T = -40C to +85C and V = +4.75V to +5.25V unless otherwise noted. Typical values are for T = 25C and Vcc = 5V. A CC A PARAMETER MIN. TYP. MAX. UNITS CONDITIONS LOGIC INPUTS V 0.8 Volts IL V 2.0 Volts IH LOGIC OUTPUTS V 0.4 Volts I = 3.2mA OL OUT V 2.4 Volts I = 1.0mA OH OUT V.28 DRIVER DC Parameters Outputs Open Circuit Voltage 15 Volts per Figure 1 Loaded Voltage 5.0 15 Volts per Figure 2 Short-Circuit Current 100 mA per Figure 4, V =0V OUT Power-Off Impedance 300 per Figure 5 AC Parameters Outputs Transition Time 1.5 s per Figure 6 +3V to -3V Instantaneous Slew Rate 30 V/s per Figure 3 Propagation Delay t 0.5 1 5 s PHL t 0.5 1 5 s PLH Max.Transmission Rate 120 230 kbps V.28 RECEIVER DC Parameters Inputs Input Impedance 3 7 k per Figure 7 Open-Circuit Bias +2.0 Volts per Figure 8 HIGH Threshold 1.7 3.0 Volts LOW Threshold 0.8 1.2 Volts AC Parameters Propagation Delay t 50 100 500 ns PHL t 50 100 500 ns PLH SP508E 101 013020 2