
1
LTC1544
Software-Selectable
Multiprotocol Transceiver
D2
D1
LTC1544
RTS
DTR
DSR
DCD
CTS
D3
R2
R1
R4
R3
D2
LTC1543
LL
TXD
SCTE
TXC
RXC
RXD
2
14
24
11
15
12
17
9
3
1
4
19
20
623
22
5
13
8
10
18
7
16
1544 TA01
LTC1344A
D3
R2
R1
R3
D1
TXD
A
(103)
TXD
B
SCTE
A
(113)
SCTE
B
RXC
A
(115)
RXC
B
RXD
A
(104)
RXD
B
RTS
A
(105)
RTS
B
DTR
A
(108)
DTR
B
CTS
A
(106)
CTS
B
LL
A
(141)
SG
(102)
SHIELD
(101)
DB-25 CONNECTOR
TXC
A
(114)
TXC
B
DCD
A
(109)
DCD
B
DSR
A
(107)
DSR
B
D4
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Data Networking
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CSU and DSU
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Data Routers
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Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
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TUV/Detecon Inc. Certified NET1 and NET2
Compliant (Test Report No. NET2/102201/97)
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TBR2 Compliant (Test Report No. CTR2/022701/98)
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Software-Selectable Cable Termination Using
the LTC1344A
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Complete DTE or DCE Port with LTC1543, LTC1344A
or LTC1546 with Integrated Termination
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Operates from Single 5V Supply with LTC1543
The LTC
1544 is a 4-driver/4-receiver multiprotocol trans-
ceiver. The LTC1544 and LTC1543 form the core of a
complete software-selectable DTE or DCE interface port that
supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36
or X.21 protocols. Cable termination for the LTC1543 may be
implemented using the LTC1344A software-selectable cable
termination chip or by using existing discrete designs. The
LTC1546 includes software-selectable cable termination on-
chip.
The LTC1544 runs from a 5V supply and the charge pump on
the LTC1543 or LTC1546. The part is available in a 28-lead
SSOP surface mount package.
FEATURES
DESCRIPTIO
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APPLICATIO S
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TYPICAL APPLICATIO
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