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LT1381 데이터시트(PDF) 1 Page - Linear Technology |
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LT1381 데이터시트(HTML) 1 Page - Linear Technology |
1 / 8 page 1 LT1381 Low Power 5V RS232 Dual Driver/Receiver with 0.1 µF Capacitors R Output Waveforms DRIVER OUTPUT RL = 3k CL = 2500pF RECEIVER OUTPUT CL = 50pF INPUT S APPLICATI s Portable Computers s Battery-Powered Systems s Power Supply Generator s Terminals s Modems APPLICATI TYPICAL DESCRIPTIO S FEATURE s ESD Protection over ±10kV s Low Cost s Uses Small Capacitors: 0.1 µF s CMOS Comparable Low Power: 40mW s Operates from a Single 5V Supply s 120kBaud Operation for RL = 3k, CL = 2500pF s 250kBaud Operation for RL = 3k, CL = 1000pF s Rugged Bipolar Design s Outputs Assume a High Impedance State When Powered Down s Absolutely No Latchup s Available in Narrow SO Package 5k 5k 0.1 µF LOGIC INPUTS LOGIC OUTPUTS 9 12 10 11 5 4 3 1 15 8 13 7 14 6 2 16 5V INPUT V+ OUT V – OUT RS232 OUTPUT RS232 OUTPUT RS232 INPUT RS232 INPUT LT1381 • TA01 LT1381 0.1 µF 0.1 µF 0.1 µF + + + S , LTC and LT are registered trademarks of Linear Technology Corporation. TransZorb® is a registered trademark of General Instruments, GSI The LT ®1381 is a dual RS232 driver/receiver pair with integral charge pump to generate RS232 voltage levels from a single 5V supply. The circuit features rugged bipolar design to provide operating fault tolerance and ESD protection unmatched by competing CMOS designs. Using only 0.1 µF external capacitors, the circuit con- sumes only 40mW of power and can operate to 120kbaud even while driving heavy capacitive loads. New ESD struc- tures on the chip allow the LT1381 to survive multiple ±10kVstrikes,eliminatingtheneedforcostlyTransZorbs® on the RS232 line pins. Driver outputs are protected from overload and can be shorted to ground or up to ±25V without damage. During power-off conditions, driver and receiver outputs are in a high impedance state, allowing line sharing. LT1381 • TA02 |
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