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LTC1688CS Datasheet(PDF) 6 Page - Linear Technology |
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LTC1688CS Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page 6 LTC1688/LTC1689 APPLICATIONS INFORMATION The LTC1688/LTC1689 family of RS485 quad differential drivers employs a novel architecture and fabrication pro- cess that allows ultra high speed operation (100Mbps) and Hot Swap capability while maintaining the ruggedness of RS485 operation (three-state outputs can float from – 7V to 12V with a single 5V supply). Unlike typical CMOS drivers whose propagation delay can vary as much as 500%, the propagation delay of the LTC1688/LTC1689 drivers will only vary by ±50% (a narrow ±4ns window). This performance is achieved by designing the input stage of each driver to have minimum propagation delay shift over temperature and from part to part. The LTC1688/LTC1689 have an ESD rating of 6kV human body model. 50Mbps with 3V Operation The LTC1688/LTC1689 are designed to operate with a 3V power supply and still achieve 50Mbps operation (see Electrical Characteristics table for 3V DC and AC specifica- 1688/89 F04 B A DI VO VO –VO 1/2 VO 3V 0V tSKEW 1.5V tPLH 1.5V tPHL 1/2 VO VDIFF = V(A) – V(B) 90% 10% tf 90% 10% tSKEW tr f = 1MHz; tr < 3ns; tf < 3ns Figure 4. Driver Propagation Delays 1688/89 F05 A, B EN 3V 0V f = 1MHz; tr ≤ 3ns; tf ≤ 3ns VOL VOH 1.5V 1.5V 5V OUTPUT NORMALLY LOW tZL 1/2 VDD 1/2 VDD tLZ 0.5V A, B 0V tZH OUTPUT NORMALLY HIGH tHZ 0.5V Figure 5. Driver Enable and Disable Times SWITCHI G TI E WAVEFOR S Figure 6. 3V High Speed Data Transmission 20ns/DIV 2V/DIV 2V/DIV 5V/DIV 1688/89 F06 LTC1689 OUTPUT RECEIVER OUTPUT FAR END OF CABLE tions). Figure 6 shows waveforms of an LTC1689 driving a receiver using 100 feet of Category 5 UTP. Both parts are operating at 3V supply. |
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