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LTC1545 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1545 Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page 7 LTC1545 SWITCHI G TI E WAVEFOR S Figure 6. V.11 Receiver Propagation Delays APPLICATIONS INFORMATION Overview The LTC1543/LTC1545 form the core of a complete soft- ware-selectable DTE or DCE interface port that supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36 or X.21 protocols. Cable termination may be implemented using the LTC1344A software-selectable cable termination chip or by using existing discrete designs. A complete DCE-to-DTE interface operating in EIA530 mode is shown in Figure 9. The LTC1543 of each port is used to generate the clock and data signals. The LTC1545 is used to generate the control signals along with LL (Local Loop-Back), RL (Remote Loop-Back), TM (Test Mode) and RI (Ring Indicate). The LTC1344A cable termination chip is used only for the clock and data signals because they must support V.35 cable termination. The control signals do not need any external resistors. Mode Selection The interface protocol is selected using the mode select pins M0, M1 and M2 (see the Mode Selection table). For example, if the port is configured as a V.35 interface, the mode selection pins should be M2 = 1, M1 = 0, M0 = 0. For the control signals, the drivers and receivers will operate in V.28 (RS232) electrical mode. For the clock and data signals, the drivers and receivers will operate in V.35 electrical mode. The DCE/DTE pin will configure the port for DCE mode when high, and DTE when low. The interface protocol may be selected simply by plugging the appropriate interface cable into the connector. The mode pins are routed to the connector and are left uncon- nected (1) or wired to ground (0) in the cable as shown in Figure 10. VIH VIL 1.5V 1.5V 1.5V 1.5V tPHL VOH VOL A R tPLH 1545 F08 Figure 8. V.10, V.28 Receiver Propagation Delays 3V 0V 1.5V 0V –3V 3V 1.5V 0V 3V –3V tPHL tf VO –VO D A tPLH tr 1545 F07 Figure 7. V.10, V.28 Driver Propagation Delays VOD2 –VOD2 0V 1.5V 0V 1.5V tPLH VOH VOL B – A R tPHL 1545 F06 f = 1MHz : tr ≤ 10ns : tf ≤ 10ns INPUT OUTPUT |
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