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PDF LTC1344ACG Data sheet ( Hoja de datos )
| Número de pieza | LTC1344ACG | |
| Descripción | Software-Selectable Cable Terminator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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
1 page  
WU
ODE SELECTIO
LTC1344A
LTC1344A
MODE NAME
DCE/DTE M2 M1 M0 R1 R2 R3 R4 R5 R6
V.10/RS423
X 000ZZZZZZ
RS530A
0 0 0 1 Z Z Z V.11 V.11 V.11
1 0 0 1 Z Z Z Z V.11 V.11
RS530
0 0 1 0 Z Z Z V.11 V.11 V.11
1 0 1 0 Z Z Z Z V.11 V.11
X.21 0 0 1 1 Z Z Z V.11 V.11 V.11
1 0 1 1 Z Z Z Z V.11 V.11
V.35 0 1 0 0 V.35 V.35 Z V.35 V.35 V.35
1 1 0 0 V.35 V.35 V.35 Z V.35 V.35
RS449/V.36
0 1 0 1 Z Z Z V.11 V.11 V.11
1 1 0 1 Z Z Z Z V.11 V.11
V.28/RS232
X 110ZZZZZZ
No Cable
X 1 1 1 V.11 V.11 V.11 V.11 V.11 V.11
X = don’t care, 0 = logic low, 1 = logic high
CC
C
A
R1
51.5Ω
S1 S2
ON OFF
LTC1344A
A
R3
124Ω
R1
51.5Ω
S1
ON
S2
ON
LTC1344A
R3
124Ω
A
R1
51.5Ω
S1 S2
OFF OFF
LTC1344A
R3
124Ω
R2
51.5Ω
B
R2
51.5Ω
B
R2
51.5Ω
B
V.11 Mode
V.35 Mode
Figure 3. LTC1344A Modes
High-Z Mode
1344 F03
5
5 Page 
LTC1344A
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
G Package
24-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
0.318 – 0.328*
(8.07 – 8.33)
24 23 22 21 20 19 18 17 16 15 14 13
0.301 – 0.311
(7.65 – 7.90)
0.205 – 0.212**
(5.20 – 5.38)
0° – 8°
1 2 3 4 5 6 7 8 9 10 11 12
0.068 – 0.078
(1.73 – 1.99)
0.005 – 0.009
(0.13 – 0.22)
0.022 – 0.037
(0.55 – 0.95)
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.0256
(0.65)
BSC
0.010 – 0.015
(0.25 – 0.38)
0.002 – 0.008
(0.05 – 0.21)
G24 SSOP 0595
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1344ACG.PDF ] | |
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