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LTC491IS Datasheet(PDF) 10 Page - Linear Technology |
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LTC491IS Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page LTC491 10 491fa S APPLICATI I FOR ATIO Fault Protection All of LTC’s RS485 products are protected against ESD transients up to 2kV using the human body model (100pF, 1.5k Ω). However, some applications need more protection. The best protection method is to connect a bidirectional TransZorb ® from each line side pin to ground (Figure 16). A TransZorb is a silicon transient voltage suppressor that has exceptional surge handling capabilities, fast response time, and low series resistance. They are available from General Semiconductor Industries and come in a variety of breakdown voltages and prices. Be sure to pick a break- down voltage higher than the common mode voltage Figure 16. ESD Protection with TransZorbs LTC491 • F16 120 Ω DRIVER Z Y required for your application (typically 12V). Also, don’t forget to check how much the added parasitic capacitance will load down the bus. TransZorb is a registered trademark of General Instruments, GSI PACKAGE DESCRIPTIO N Package 14-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) N14 1002 .020 (0.508) MIN .120 (3.048) MIN .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .018 ± .003 (0.457 ± 0.076) .005 (0.125) MIN .255 ± .015* (6.477 ± 0.381) .770* (19.558) MAX 3 1 2 4 5 6 7 8 9 10 11 12 13 14 .008 – .015 (0.203 – 0.381) .300 – .325 (7.620 – 8.255) .325 +.035 –.015 +0.889 –0.381 8.255 () NOTE: 1. DIMENSIONS ARE INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) .100 (2.54) BSC |
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