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LT1080CJ Datasheet(PDF) 6 Page - Linear Technology |
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LT1080CJ Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page 6 LT1080/LT1081 APPLICATIO S I FOR ATIO The driver output stage of the LT1080 offers significantly improved protection over older bipolar and CMOS de- signs. In addition to current limiting, the driver output can be externally forced to ±30V with no damage or excessive current flow, and will not disrupt the supplies. Some drivers have diodes connected between the outputs and the supplies, so externally applied voltages can cause excessive supply voltage to develop. Placing the LT1080 in the SHUTDOWN mode (Pin 18 low) puts both the driver and receiver outputs in a high imped- ance state. This allows data line sharing and transceiver applications. The SHUTDOWN mode also drops input supply current (VCC; Pin 17) to zero for power-conscious systems. 1080/81 F03 LT1080 #1 DRIVER LOGIC TRANSMIT/RECEIVE LINE RS232 TRANSMIT/RECEIVE LINE LOGIC INVERTER ON/OFF (TRANSMIT/ RECEIVE) INPUT LT1080 #2 RECEIVER 30V –30V OUTPUT CAN BE FORCED EXTERNALLY 1080/81 F01 LT1080/LT1081 Driver Transceiver Sharing a Receiver Line Sharing a Transmitter Line Older RS232 Drivers and CMOS Drivers V+ V– WITH SOME DRIVERS, EXTERNALLY APPLIED VOLTAGE CAN FORCE THE SUPPLIES 1080/81 F02 LT1080 #1 RECEIVER 1080/81 F04 RS232 INPUT A RS232 INPUT B LOGIC OUTPUT LOGIC INVERTER ON/OFF (CHANNEL SELECT) INPUT LT1080 #2 RECEIVER LT1080 #1 DRIVER LOGIC INPUT A LOGIC INPUT B RS232 TRANSMISSION LINE LT1080 #2 DRIVER 1080/81 F05 LOGIC INVERTER ON/OFF (CHANNEL SELECT) INPUT |
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