LTC1344_15 Datasheet, PDF (1/12 Pages) Linear Technology – Software-Selectable Cable Terminator

LTC1344
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
APPLICATIO S
s _{Data Networking}
s _{CSU and DSU}
s _{Data Routers}
DESCRIPTIO
The LTC^®1344 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
LTC1343, the LTC1344 forms a complete software-select-
able multiprotocol serial port. A data bus latch feature
allows sharing of the select lines between multiple inter-
face ports.
The LTC1344 is available in a 24-lead SSOP.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
CTS DSR DCD
DTR RTS RL
Daisy-Chained Control Outputs
LTC1343
R4 R3 R2 R1
D4 D3 D2 D1
TM RXD RXC TXC
SCTE TXD LL
LTC1343
R4 R3 R2 R1
D4 D3 D2 D1
LTC1344
13 5 22 6 10 8
23 20 19 4 21 1 7 25 16 3 9 17 12 15
11 24 14 2 18
DB-25 CONNECTOR
1344 TA01
1