LTC2846
3.3V Software-Selectable
Multiprotocol Transceiver
with Termination
FEATURES
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DESCRIPTIO
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Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
Operates from Single 3.3V Supply
TUV Rheinland of North America Inc. Certified NET1,
NET2 and TBR2 Compliant, Report No.:
TBR2/050101/02, TBR2/051501/02
1.2MHz Boost Switching Regulator for 3.3V to 5V
Conversion
On-Chip Cable Termination
Complete DTE or DCE Port with LTC2844 or LTC2845
Small Footprint
Available in 36-Lead SSOP (0.209 Wide) Package
APPLICATIO S
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The LTC
廬
2846 is a 3-driver/3-receiver multiprotocol trans-
ceiver with on-chip cable termination. When combined with
the LTC2844 or LTC2845, 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 LTC2846. The LTC2846 has a boost regulator that takes
in a 3.3V input and switches at 1.2MHz, allowing the use of
tiny, low cost capacitors and inductors 2mm or less in height.
The 5V output drives an internal charge pump that requires
only five space-saving surface mounted capacitors. The
LTC2846 is available in a 36-lead SSOP surface mount
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Data Networking
CSU and DSU
Data Routers
TYPICAL APPLICATIO
LL
CTS
DSR
Complete DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
DCD
DTR
RTS
RXD
RXC
TXC
SCTE
TXD
LTC2844
D4
R4
R3
R2
R1
D3
D2
D1
R3
R2
LTC2846
D3
R1
D2
D1
T
T
18
13 5
22 6
10 8
23 20 19 4
1
7
16
3
9
17
DB-25 CONNECTOR
2846 TA01
U
T
T
T
12
15 11
24 14
2
U
U
DSR B
DSR A (107)
LL A (141)
CTS B
CTS A (106)
DTR B
DTR A (108)
RTS B
RTS A (105)
SHIELD (101)
SG (102)
DCD B
DCD A (109)
TXC B
TXC A (114)
SCTE B
SCTE A (113)
TXD B
TXD A (103)
RXD B
RXD A (104)
RXC B
RXC A (115)
sn2846 2846fs
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