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LT1781CS Datasheet(PDF) 7 Page - Linear Integrated Systems |
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LT1781CS Datasheet(HTML) 7 Page - Linear Integrated Systems |
7 / 12 page 7 LT1780/LT1781 ESD PROTECTIO The RS232 line inputs of the LT1780/LT1781 have on-chip protection from ESD transients up to ±15kV air gap and ±8kV contact tested to IEC-1000-4-2 test methods. The protection structures act to divert the static discharge safely to system ground. In order for the ESD protection to function effectively, the power supply and ground pins of the circuit must be connected to ground through low impedances. The power supply decoupling capacitors and charge pump storage capacitors provide this low imped- ance in normal application of the circuit. The only con- straint is that low ESR capacitors must be used for bypassing and charge storage. ESD testing must be done with pins VCC, VL, V+, V –, and GND shorted to ground or connected with low ESR capacitors. Operation Using 5V and 12V Power Supplies 1780 • ESD TC 0.1 µF RS232 LINE PINS PROTECTED TO IEC-1000-4-2 LEVEL 4 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 0.1 µF 0.1 µF 0.1 µF NC C1+ V+ C1– C2+ C2– V– DR2 OUT LT1780 0.1 µF ON/OFF 5V VCC GND DR1 OUT RX1 IN RX1 OUT DR1 IN DR2 IN RS232 LINE PINS PROTECTED TO IEC-1000-4-2 LEVEL 4 RX2 IN RX2 OUT ESD Test Circuit 5k 5k 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 –12VOUT RS232 OUTPUT RS232 OUTPUT RS232 INPUT RS232 INPUT 1780/81 • TA03 LT1780 12V INPUT TYPICAL APPLICATIO |
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