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LT1039-16 Datasheet(PDF) 6 Page - Linear Technology |
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LT1039-16 Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page 6 LT1039/LT1039-16 1039fd APPLICATIONS INFORMATION The driver output stage of the LT1039 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. LT1039 Driver Some drivers have diodes connected between the out- puts and the supplies, so externally applied voltages can cause excessive supply voltage to develop LT1039 #1 DRIVER LT1039 #2 DRIVER LOGIC INPUT A LOGIC INPUT B 1039 AI03 ON/OFF (CHANNEL SELECT) INPUT LOGIC INVERTER RS232 TRANSMISSION LINE Sharing a Receiver Line WITH SOME DRIVERS, EXTERNALLY APPLIED VOLTAGE CAN FORCE THE SUPPLIES 1039 AI02 V + V – Older RS232 Drivers and Other CMOS Drivers Sharing a Transmitter Line Placing the LT1039 in the shutdown mode (Pin 17 low) puts both the driver and receiver outputs in a high imped- ance state. This allows data line sharing and transceiver applications. –30V 30V OUTPUT CAN BE FORCED EXTERNALLY 1039 AI01 LT1039 Transceiver LT1039 #1 RECEIVER RS232 INPUT A RS232 INPUT B 1039 AI04 ON/OFF (CHANNEL SELECT) INPUT LOGIC INVERTER LOGIC OUTPUT LT1039 #2 RECEIVER LT1039 #1 DRIVER LOGIC TRANSMIT/RECEIVE LINE RS232 TRANSMIT/RECEIVE LINE 1039 AI05 ON/OFF (TRANSMIT/RECEIVE) INPUT LOGIC INVERTER LT1039 #2 RECEIVER The shutdown mode also drops all supply currents (VCC, V +, V –) to zero for power conscious systems. |
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