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LTC1546 Datasheet(PDF) 9 Page - Linear Technology |
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LTC1546 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 20 page  9 LTC1546 Figure 15. V.28 Driver Propagation Delays Figure 16. V.28 Receiver Propagation Delays VIH VIL 1.3V 0.8V 1.7V 2.4V tPHL VOH VOL A R tPLH 1546 F16 3V 0V 1.5V 0V –3V 3V 1.5V 0V 3V –3V tPHL tf VO –VO D A tPLH tr 1546 F15 SR = 6V tf SR = 6V tr SWITCHI G TI E WAVEFOR S Overview The LTC1546 and LTC1544 form a complete software- selectable DTE or DCE interface port that supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36 and X.21 protocols. Cable termination is provided on-chip, elimi- nating the need for discrete termination designs. A complete DCE-to-DTE interface operating in EIA530 mode is shown in Figure 17. The LTC1546 half of each port is used to generate and appropriately terminate the clock and data signals. The LTC1544 is used to generate the control signals along with LL (Local Loopback). Mode Selection The interface protocol is selected using the mode select pins M0, M1 and M2 (see Table 1). 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 18. The internal pull-up current sources will ensure a binary 1 when a pin is left unconnected. The mode selection may also be accomplished by using jumpers to connect the mode pins to ground or VCC. When the cable is removed, leaving all mode pins uncon- nected, the LTC1546/LTC1544 will enter no-cable mode. In this mode the LTC1546/LTC1544 supply current drops to less than 500 µA and the LTC1546/LTC1544 driver outputs are forced into a high impedance state. At the same time, the R2 and R3 receivers of the LTC1546 are differentially terminated with 103 Ω and the other receiv- ers on the LTC1546 and LTC1544 are terminated with 30k Ω to ground. APPLICATIO S I FOR ATIO |
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