LTC1344A Datasheet, PDF (1/12 Pages) Linear Technology – Software-Selectable Cable Terminator

LTC1344A
Software-Selectable
Cable Terminator
FEATURES
s _{Software-Selectable Cable Termination for:}
RS232 (V.28)
RS423 (V.10)
RS422 (V.11)
RS485
RS449
EIA530
EIA530-A
V.35
V.36
X.21
s _{Outputs Won’t Load the Line with Power Off}
U
APPLICATIONS
s _{Data Networking}
s _{CSU and DSU}
s _{Data Routers}
DESCRIPTION
The LTC^®1344A features six software-selectable
multiprotocol cable terminators. Each terminator can be
configured as an RS422 (V.11) 100Ω minimum differen-
tial load, V.35 T-network load or an open circuit for use
with RS232 (V.28) or RS423 (V.10) transceivers that
provide their own termination. When combined with the
LTC1543 and LTC1544, the LTC1344A forms a complete
software-selectable multiprotocol serial port. A data bus
latch feature allows sharing of the select lines between
multiple interface ports.
The LTC1344A is similar to the LTC1344 except for a
difference in the Mode Selection table.
The LTC1344A is available in a 24-lead SSOP.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
LL CTS DSR
DCD DTR RTS
RXD RXC
TXC SCTE TXD
D4
R4
Daisy-Chained Control Outputs
LTC1544
R3 R2 R1
D3 D2 D1
LTC1543
R3 R2 R1
D3 D2 D1
LTC1344A
18 13 5 10 8
22 6 23 20 19 4 1 7 16 3 9 17
12 15 11 24 14 2
DB-25 CONNECTOR
1344A TA01
1