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LTC2847
sn2847 2847fs
APPLICATIO S
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DESCRIPTIO
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FEATURES
TYPICAL APPLICATIO
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, LTC and LT are registered trademarks of Linear Technology Corporation.
Complete DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
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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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Operates from Single 5V Supply
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Separate Supply Pin for Digital Interface Works
down to 3V
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On-Chip Cable Termination
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Complete DTE or DCE Port with LTC2845
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Available in 38-Pin 5mm · 7mm QFN Package
The LTC
®
2847 is a 3-driver/3-receiver multiprotocol trans-
ceiver with on-chip cable termination. When combined with
the 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 LTC2847.
The V
CC
supplies the drivers, the receivers and an internal
charge pump that requires only five space-saving surface
mounted capacitors. The V
IN
supply drives the digital inter-
face circuitry including the receiver output drivers. It can be
tied to V
CC
or be powered off a lower supply (down to 3V) to
interface with low voltage ASICs. The LTC2847 is available in
a 0.8mm tall, 5mm · 7mm QFN package.
Software-Selectable
Multiprotocol Transceiver with
Termination and 3.3V Digital Interface
D2 D1
LTC2845
RTSDTRDSR DCDCTS
D3
R2 R1R4 R3
LTC2847
RILLTMRL TXDSCTETXC
RXCRXD
21424111512179314192082310513 622182521 716
2847 TA01
D1
SCTE B SCTE A (113) TXD B TXD A (103)RXC A (115)RXC BRXD A (104)RXD BRTS A (105)RTS BDTR A (108)DTR BLL A (141)TM (142)RL (140) SG (102)SHIELD (101)
DB-25 CONNECTOR
TXC A (114)DCD A (109)DCD BDSR A (107)DSR B
D4
R5
D5 D2D3
R1R2R3
TXC B
TTTTT
CTS A (106)CTS BRI (125)
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*OPTIONAL