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LTC1688CS Datasheet(PDF) 6 Page - Linear Technology

Part # LTC1688CS
Description  100Mbps RS485 Hot Swapable Quad Drivers
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1688CS Datasheet(HTML) 6 Page - Linear Technology

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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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