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LTC1387C Datasheet(PDF) 9 Page - Linear Technology |
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LTC1387C Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1387 SWITCHI G WAVEFOR S V IH A, B R VOL VOH LTC1387 • F11 tPHL tPLH VIL 2.4V 0.8V 1.3V 1.7V Figure 11. RS232 Receiver Propagation Delays 1.5V 3V 0V RXEN f = 1MHz: tr ≤ 10ns: tf ≤ 10ns 1.5V R VOL 5V tZL tLZ 0.5V OUTPUT NORMALLY LOW 0V LTC1387 • F12 1.5V 1.5V tZH VOH OUTPUT NORMALLY HIGH tHZ 0.5V R Figure 12. Receiver Enable and Disable Times S APPLICATI I FOR ATIO Basic Theory of Operating The LTC1387 is a single 5V supply, single-port logic reconfigurable RS485/RS232 transceiver with an onboard charge pump. The interface port offers a flexible combina- tion of an RS485 driver and an RS485 receiver or two RS232 drivers and two RS232 receivers. The RS485 transceiver and the RS232 transceivers are designed to share the same I/O pins. A logic input 485/232 controls the selection between RS485 and RS232 transceiver modes. The RS485 transceiver supports both RS485 and RS422 standards, whereas the RS232 transceivers support both RS232 and EIA562 standards. With four additional control inputs: ON, DXEN, RXEN and SLEW, the LTC1387 can easily be reconfigured via software to adapt to various communication needs including a one-signal-line RS232 I/O mode. Four examples of interface port connections are shown in Figures 13 through 16. Both the interface drivers and the receivers feature three- state outputs. Driver outputs are forced into high impedance when the driver is disabled, in the shutdown mode or with the power off. The driver outputs can be forced beyond power supply levels without damage up to ±18V. The receiver inputs can withstand ±25V without damage. The receiver input resistance is typically 24k in RS485 mode, shutdown mode or power off but drops to 5k in RS232 mode. In RS485 mode, the DXEN and RXEN control the three- state outputs of the driver and receiver respectively. The SLEW input is active during RS485 mode and the logic level controls the differential driver slew rate. This pin has an internal 5 µA pull-up current source during the RS485 mode. A high logic selects fast differential driver slew rate and a low logic selects slow slew rate. In slow slew mode, the maximum signal bandwidth is reduced, minimizing |
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