LTC1544 Linear Technology, LTC1544 Datasheet - Page 8

• Manufacturer Part Number: LTC1544
• Description: Software-Selectable Multiprotocol Transceiver
• Manufacturer: Linear Technology

APPLICATIONS
LTC1544
Overview
The LTC1543/LTC1544 form the core of a complete soft-
ware-selectable DTE or DCE interface port that supports
the RS232, RS449, EIA530, EIA530-A, V.35, V.36 or X.21
protocols. Cable termination may be implemented using
the LTC1344A software-selectable cable termination chip
or by using existing discrete designs.
8
CONTROLLER
SERIAL
SCTE
DTR
DCD
DSR
RXD
RTS
RXC
CTS
TXD
TXC
LL
U
INFORMATION
U
D4
D1
D2
D3
D2
LTC1543
D1
D3
LTC1544
R1
R2
R3
R4
R1
R2
R3
DTE
W
Figure 9. Complete Multiprotocol Interface in EIA530 Mode
LTC1344A
U
103
103
103
RXD
SCTE
TXC
RXC
TXD
DTR
DCD
DSR
RTS
CTS
LL
A complete DCE-to-DTE interface operating in EIA530
mode is shown in Figure 9. The LTC1543 of each port is
used to generate the clock and data signals. The LTC1544
is used to generate the control signals along with LL (Local
Loop-back).The LTC1344A cable termination chip is used
only for the clock and data signals because they must
support V.35 cable termination. The control signals do not
need any external resistors.
LTC1344A
103
103
DCE
LTC1543
LTC1544
R4
R2
R3
R1
R3
R2
R1
D3
D2
D1
D3
D2
D1
D4
TXD
SCTE
TXC
RXC
RXD
RTS
DTR
DCD
DSR
CTS
LL
CONTROLLER
SERIAL
1544 F09