LTC2845CUHF#TR Linear Technology, LTC2845CUHF#TR Datasheet - Page 10

• Manufacturer Part Number: LTC2845CUHF#TR
• Description: IC TXRX 3.3V MULTIPROTOCOL 38QFN
• Manufacturer: Linear Technology
• Type: Transceiverr

Specifications of LTC2845CUHF#TR

• Number Of Drivers/receivers: 5/5
• Protocol: Multiprotocol
• Voltage - Supply: 3.3V
• Mounting Type: Surface Mount
• Package / Case: 38-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIONS
LTC2845
Overview
The LTC2846/LTC2845 or LTC2847/LTC2845 form the
core of a complete software-selectable DTE or DCE inter-
face port that supports the RS232, RS449, EIA530, EIA530-
A, V.35, V.36 or X.21 protocols. Cable termination is
provided on-chip, eliminating the need for discrete de-
signs.
10
CONTROLLER
SERIAL
SCTE
DTR
DCD
DSR
RXC
RXD
RTS
TXD
CTS
TXC
TM
LL
RL
RI
U
INFORMATION
U
D4
D1
D2
D3
D1
D2
D3
LTC2845
R1
R2
R3
R4
R1
R2
R3
Figure 9. Complete Multiprotocol Interface in EIA530 Mode
LTC2846
DTE
D5
W
R5
103
103
103
U
SCTE
RXC
RXD
TXC
TXD
DCD
DSR
RTS
DTR
CTS
TM
LL
RI
RL
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 LTC2845
is used to generate the control signals along with LL (Local
Loop-Back), RL (Remote Loop-Back), TM (Test Mode)
and RI (Ring Indicate). Cable termination is used only for
the clock and data signals because they must support V.11
cable termination. The control signals do not need any
external resistors.
103
103
LTC2846
DCE
R5
LTC2845
D5
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
TM
RI
RL
CONTROLLER
SERIAL
2845 F09
sn2845 2845fs