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LT1039A Datasheet(PDF) 7 Page - Linear Technology |
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LT1039A Datasheet(HTML) 7 Page - Linear Technology |
7 / 14 page LT1039A/LT1039A-16 7 1039afb For more information www.linear.com/1039 When driving CMOS logic from a receiver that will be used in the shutdown mode and there is no other active receiver on the line, a 51k resistor can be placed from the logic input to VCC to force a definite logic level when the receiver output is in a high impedance state. applicaTions inForMaTion Driving CMOS Logic from a Receiver Input Overvoltage Protection 5kΩ Impedance Matching Keeping Alive One Receiver While in Shutdown RS232 Compatible Shutdown Control Line LT1039A RECEIVER RS232 INPUT ON/OFF INPUT LOGIC OUTPUT *FORCES LOGIC INPUT STATE WHEN VON/OFF IS LOW 51k* VCC 1039A AI06 CMOS LOGIC RS232 INPUT LOGIC OUTPUT RECEIVER 1039A AI07 30k 1k 30V 30V 5.6k 1039A AI08 RS232 INPUT LOGIC OUTPUT RECEIVER 30k 5.6k LT1039A 25k LOGIC SHUTDOWN INPUT 2 3 16 17 BIAS RS232 INPUT ON/OFF LOGIC OUTPUT 1039A AI09 LT1039A 25k 2 3 16 17 BIAS RS232 SHUTDOWN INPUT ON/OFF 1039A AI10 To protect against receiver input overloads in excess of ±30V, a voltage clamp can be placed on the data line and still maintain RS232 compatibility. The receiver input impedance of the LT1039A is nominally 30kΩ. For applications requiring a 5kΩ input impedance, a 5.6k resistor can be connected from the receiver input to ground. Driver inputs should not be allowed to float. Any unused inputs should be tied to VCC. The BIAS pin is used to “keep alive” one receiver while in the shutdown mode (all other circuitry being inactive). This allows a system to be in shutdown and still have one active receiver for transferring data. It can also be used to make an RS232 compatible shut- down control line. Driving the BIAS pin low through a resistance of 24k to 30k keeps the receiver active. Do not drive the BIAS pin directly from a logic output without the series resistor. An unused BIAS pin should be left open. |
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