ltc2844 Linear Technology Corporation, ltc2844 Datasheet - Page 10

• Manufacturer Part Number: ltc2844
• Description: 3.3v Software-selectable Multiprotocol Transceiver
• Manufacturer: Linear Technology Corporation

APPLICATIONS
LTC2844
Overview
The LTC2846/LTC2844 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.
10
CONTROLLER
SERIAL
SCTE
DTR
DCD
DSR
RXD
RTS
TXD
RXC
CTS
TXC
LL
U
INFORMATION
U
D4
D1
D2
D3
D1
D2
D3
LTC2844
R1
R2
R3
R4
R1
R2
R3
LTC2846
DTE
W
Figure 9. Complete Multiprotocol Interface in EIA530 Mode
103
103
103
U
SCTE
TXC
RXC
RXD
TXD
RTS
DTR
DCD
DSR
CTS
LL
A complete DCE-to-DTE interface operating in EIA530
mode is shown in Figure 9. The LTC2846 of each port is
used to generate the clock and data signals. The LTC2844
is used to generate the control signals along with LL (local
loop-back). Cable termination is used only for the clock
and data signals. The control signals do not need any
external resistors.
103
103
LTC2846
DCE
LTC2844
R4
R2
R3
R1
R3
R2
R1
D3
D2
D1
D3
D2
D1
D4
RTS
TXD
SCTE
TXC
RXC
RXD
DTR
DCD
DSR
CTS
LL
CONTROLLER
SERIAL
2844 F09
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