Datasheet

1
LTC1546
APPLICATIO S
U
FEATURES
TYPICAL APPLICATION
U
DESCRIPTIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
Complete DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
Data Networking
CSU and DSU
Data Routers
Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
TUV Telecom Services Inc. Certified NET1,
NET2 and TBR2 Compliant
On-Chip Cable Termination
Pin Compatible with LTC1543
Complete DTE or DCE Port with LTC1544
Operates from Single 5V Supply
Small Footprint
The LTC
®
1546 is a 3-driver/3-receiver multiprotocol trans-
ceiver with on-chip cable termination. When combined with
the LTC1544, this chip set forms a complete software-
selectable DTE or DCE interface port that supports the
RS232, RS449, EIA530, EIA530-A, V.35, V.36 and X.21
protocols. All necessary cable termination is provided inside
the LTC1546. In most applications, the LTC1546 replaces
both an LTC1543 and an LTC1344A without any changes to
the PC board.
The LTC1546 runs from a single 5V supply using an internal
charge pump that requires only five space-saving surface
mounted capacitors. The LTC1546 is available in a 28-lead
SSOP surface mount package.
Software-Selectable
Multiprotocol Transceiver
with Termination
D2 D1
LTC1544
RTS
DTRDSR DCDCTS
D3
R2 R1R4
R3
LTC1546
LL
TXDSCTETXC
RXCRXD
21424111512179314192062322513 81018 7 16
1546 TA01
D1
SCTE B
SCTE A (113)
TXD B
TXD A (103)
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)
DCD A (109)
DCD B
DSR A (107)
DSR B
D4
D2D3
R1R2R3
TXC B
TTTTT

Summary of content (20 pages)