LTC1545CG View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1545CG Datasheet PDF : 16 Pages
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LTC1545
APPLICATIONS INFORMATION
SERIAL
CONTROLLER
TXD
DTE
LTC1543
D1
LTC1344A
LTC1344A
TXD
103Ω
SCTE
D2
SCTE
103Ω
D3
DCE
LTC1543
R3
R2
R1
SERIAL
CONTROLLER
TXD
SCTE
TXC
R1
RXC
R2
RXD
R3
103Ω
TXC
103Ω
RXC
103Ω
RXD
D3
TXC
D2
RXC
D1
RXD
LTC1545
RTS
D1
RTS
LTC1545
R3
RTS
DTR
D2
DTR
R2
DTR
D3
R1
DCD
R1
DCD
D3
DCD
DSR
R2
DSR
D2
DSR
CTS
R3
CTS
D1
CTS
LL
LL
D4
TM
R4
TM
RI
R5
RI
RL
RL
D5
R4
LL
D4
TM
D5
RI
R5
RL
1545 F09
Figure 9. Complete Multiprotocol Interface in EIA530 Mode
The internal pull-up current sources will ensure a binary 1
when a pin is left unconnected and that the LTC1543/
LTC1545 and the LTC1344A enter the no-cable mode
when the cable is removed. In the no-cable mode the
LTC1543/LTC1545 supply current drops to less than
200µA and all LTC1543/LTC1545 driver outputs and
LTC1344A resistive terminations are forced into a high
impedance state.
The mode selection may also be accomplished by using
jumpers to connect the mode pins to ground or VCC.
Cable Termination
Traditional implementations have included switching
resistors with expensive relays, or required the user to
change termination modules every time the interface
standard has changed. Custom cables have been used
8
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