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LT1780 Datasheet(PDF) 1 Page - Linear Technology |
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LT1780 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1780/LT1781 Low Power 5V RS232 Dual Driver/Receiver with ±15kV ESD Protection TransZorb is a registered trademark of General Instruments, GSI. R Output Waveforms 1780/81 • TA02 DRIVER OUTPUT RL = 3k CL = 2500pF RECEIVER OUTPUT CL = 50pF INPUT 0.1 µF 0.1 µF 0.1 µF 0.1 µF LOGIC INPUTS LOGIC OUTPUTS ON/OFF 18 10 13 11 12 6 5 4 2 16 9 14 8 15 7 3 17 5V INPUT V+ OUT V – OUT RS232 OUTPUT RS232 OUTPUT RS232 INPUT RS232 INPUT 1780/81 • TA01 5k 5k LT1780 APPLICATI TYPICAL S FEATURE DESCRIPTIO The LT ®1780/LT1781 are dual RS232 driver/receiver pairs with integral charge pump to generate RS232 voltage levels from a single 5V supply. Using only 0.1 µF external capacitors, these circuits consume only 40mW of power, and can operate to 120kbaud even while driving heavy capacitive loads. New ESD structures on the chip allow the LT1780/LT1781 to survive ±15kV air gap and ±8kV con- tact ESD tests per IEC 1000-4-2, eliminating the need for costly TransZorbs ® on the RS232 line pins. The LT1780/ LT1781 are fully compliant with EIA RS232 standards. Driver outputs are protected from overload, and can be shorted to ground or up to ±30V without damage. During SHUTDOWN or power-off conditions, driver and receiver outputs are in a high impedance state, allowing line sharing. The LT1780/LT1781 are direct upgrades to the LT1180A/ LT1181A, LT1280A/LT1281A and LT1381 for applications which require the utmost ESD protection. The LT1781 is available in 16-pin DIP,SO and SW pack- ages. The LT1780 is supplied in 18-pin DIP and SW packages for applications which require SHUTDOWN. s 10mA Max Supply Current s ESD Protection to IEC 1000-4-2 Level 4 ±15kV Air Gap, ±8kV Contact s Uses Small Capacitors: 0.1 µF s 120kBaud Operation for RL = 3k, CL = 2500pF s 250kBaud Operation for RL = 3k, CL = 1000pF s Outputs Withstand ±30V Without Damage s CMOS Comparable Low Power: 40mW s Operates from a Single 5V Supply s Rugged Bipolar Design s Outputs Assume a High Impedance State When Off or Powered Down s Meets All RS232 Specifications s Available With or Without Shutdown s Absolutely No Latch-up s Portable Computers s Battery-Powered Systems s Power Supply Generator s Terminals s Modems S APPLICATI , LTC and LT are registered trademarks of Linear Technology Corporation. |
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