LTC1544
Software-Selectable
Multiprotocol Transceiver
FEATURES
s
s
DESCRIPTIO
s
s
s
s
Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
TUV/Detecon Inc. Certified NET1 and NET2
Compliant (Test Report No. NET2/102201/97)
TBR2 Compliant (Test Report No. CTR2/022701/98)
Software-Selectable Cable Termination Using
the LTC1344A
Complete DTE or DCE Port with LTC1543, LTC1344A
or LTC1546 with Integrated Termination
Operates from Single 5V Supply with LTC1543
APPLICATIO S
s
s
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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.
Data Networking
CSU and DSU
Data Routers
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
LL
CTS
DSR
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
DCD
DTR
RTS
RXD
RXC
TXC
SCTE
TXD
LTC1544
D4
R4
R3
R2
R1
D3
D2
D1
R3
R2
R1
LTC1543
D3
D2
D1
18
LL A (141)
13 5
CTS B
CTS A (106)
10 8
DSR B
DSR A (109)
22 6
DCD B
DCD A (107)
23 20 19 4
DTR B
DTR A (108)
RTS B
RTS A (105)
SHIELD (101)
1
SG (102)
7
16 3
RXD B
RXD A (104)
9
RXC B
17
RXC A (115)
12 15 11 24 14
SCTE B
SCTE A (113)
TXD B
TXD A (103)
TXC B
TXC A (114)
DB-25 CONNECTOR
U
LTC1344A
2
1544 TA01
U
U
1
LINER [ LINEAR TECHNOLOGY ]
