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SP503 Datasheet(PDF) 10 Page - Exar Corporation |
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SP503 Datasheet(HTML) 10 Page - Exar Corporation |
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10 / 28 page  SP503_101_101508 SP503 Multiprotocol Transceiver © Copyright 2008 Exar Corporation 10 VCC = +5V –5V +5V –5V VSS Storage Capacitor VDD Storage Capacitor C1 C2 C3 C4 + + ++ – – – – Figure 4. Charge Pump Phase 3. VCC = +5V +10V VSS Storage Capacitor VDD Storage Capacitor C1 C2 C3 C4 + + ++ – – – – Figure 5. Charge Pump Phase 4. There are three basic types of driver circuits — RS-232, RS-423, and RS-485. The RS-232 driv- ers output a minimum of ±5V level single– ended signals (with 3k Ω and 2500pF loading), and can operate up to 120kbps. The RS-232 drivers are used in RS-232 mode for all signals, and also in V.35 mode where they are used as the control line signals. The RS-423 drivers output a minimum of ±3.6V level single–ended signals (with 450 Ω loading) and can operate up to 120kbps. Open circuit V OL and VOH measurements may exceed the ±6V limitation of RS-423. The RS-423 drivers are used in RS-449 and EIA-530 modes as RL and LL outputs. The third type of driver supports RS-485, which is a differential signal that can maintain ±1.5V differential output levels with a worst case load of 54 Ω. The signal levels and drive capability of the RS-485 drivers allow the drivers to also support RS-422 requirements of ±2V differen- tial output levels with 100 Ω loads. The RS-422 drivers are used in RS-449 and EIA-530 modes as clock, data, and some control line signals. The RS-485–type drivers are also used in the V.35 mode. V.35 levels require ±0.55V signals with a load of 100 Ω. In order to meet the voltage requirements of V.35, external series resistors with source impedance termination resistors must be implemented to voltage divide the driver outputs from 0 to +5V to 0 to +0.55V. Figure 6 shows the values of the resistor network and how to connect them. The termination network also achieves the 50 Ω to 150Ω source imped- ance for V.35. For applications that require V.11 signals for clock and data instead of V.35 levels, omit the external termination networks. All of the differential drivers, RS-485, RS-422, and V.35 can operate up to 5Mbps. Table 1. SP503 Drivers Pin Label Mode: RS-232 V.35 RS-422 RS-485 RS-449 EIA-530 TDEC 3–TDEC0 0000 0010 1110 0100 0101 1100 1101 SD(a) tri–state RS-232 V.35– RS-422– RS-485– RS-422– RS-422– SD(b) tri–state tri–state V.35+ RS-422+ RS-485+ RS-422+ RS-422+ TR(a) tri–state RS-232 RS-232 RS-422– RS-485– RS-422– RS-422– TR(b) tri–state tri–state tri–state RS-422+ RS-485+ RS-422+ RS-422+ RS(a) tri–state RS-232 RS-232 RS-422– RS-485– RS-422– RS-422– RS(b) tri–state tri–state tri–state RS-422+ RS-485+ RS-422+ RS-422+ RL(a) tri–state RS-232 RS-232 RS-422– RS-485– RS-423 RS-423 RL(b) tri–state tri–state tri–state RS-422+ RS-485+ tri–state tri–state LL(a) tri–state RS-232 RS-232 RS-422– RS-485– RS-423 RS-423 LL(b) tri–state tri–state tri–state RS-422+ RS-485+ tri–state tri–state ST(a) tri–state RS-232 V.35– RS-422– RS-485– RS-422– RS-422– ST(b) tri–state tri–state V.35+ RS-422+ RS-485+ RS-422+ RS-422+ TT(a) tri–state RS-232 V.35– RS-422– RS-485– RS-422– RS-422– TT(b) tri–state tri–state V.35+ RS-422+ RS-485+ RS-422+ RS-422+ |
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