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PDF LTC1344CG Data sheet ( Hoja de datos )
| Número de pieza | LTC1344CG | |
| Descripción | Software-Selectable Cable Terminator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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
1 page  
WU
ODE SELECTIO
LTC1344
LTC1344
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
Reserved
0 0 1 0 Z Z Z V.11 V.11 V.11
1 0 1 0 V.11 V.11 V.11 Z Z Z
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
RS530/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
A
R1
51.5Ω
C
S1 S2
ON OFF
R3
124Ω
R2
51.5Ω
B
V.11 Mode
A
R1
51.5Ω
C
S1
ON
S2
ON
R3
124Ω
R2
51.5Ω
B
V.35 Mode
Figure 3. LTC1344 Modes
A
R1
51.5Ω
C
S1 S2
OFF OFF
R3
124Ω
R2
51.5Ω
B
1344 F03
Hi-Z Mode
5
5 Page 
LTC1344
TYPICAL APPLICATIONS N
Cable Selectable Multiprotocol DTE Port with DB-25 Connector
C6 C7 C8
100pF 100pF 100pF
DTE_TXD/DCE_RXD
DTE_SCTE/DEC_RXC
DTE_TXC/DCE_TXC
DTE_RXC/DCE_SCTE
DTE_RXD/DCE_TXD
DTE_RTS/DCE_CTS
DTE_DTR/DCE_DSR
DTE_DCD/DCE_DCD
DTE_DSR/DCE_DTR
DTE_CTS/ DCE_RTS
LB
VCC
5V
C3
1µF C1
1µF
C5
1µF
R1
100k
1 44
2 43
4
42
CHARGE
3 PUMP
8 41
LTC1343
5
D1
39
6 D2
38
37
7 D3
36
35
9
D4
10
34
33
12
13 32
R1 31
14 30
R2 29
28
15 R3 27
16 R4
20
22 CTRL
LATCH
11
INVERT
25 423 SET
26
21
DCE
19
M2
18
M1
17
M0
40
23 GND
LB
24
EC
14
VCC
C2
1µF
2
C4
3.3µF
VEE
VCC
VCC
C11
1µF C9
1µF
VCC C12
1µF
VCC
R2
100k
1 44
2 43
4
42
CHARGE
3 PUMP
8 41
LTC1343
5
D1
39
6 D2
38
37
7 D3
9
D4
10
36
35
34
33
12 32
13 R1 31
30
14 R2 29
28
15 R3 27
16 R4
20
22 CTRL
LATCH
11
25 INVERT
423 SET
26
21
DCE
19
M2 18
M1
17
M0
40
23 GND
LB
24
EC
C10
1µF
C13
3.3µF
VCC
3 8 11 12 13
LTC1344
21
LATCH
DCE/
DTE M2 M1 M0
5 4 6 7 9 10 16 15 18 17 19 20 22 23 24 1
VCC
DB-25 CONNECTOR
DTE
2 TXD A
14 TXD B
24 SCTE A
11 SCTE B
DCE
RXD A
RXD B
RXC A
RXC B
15 TXC A
12 TXC B
17 RXC A
9 RXC B
3 RXD A
16 RXD B
TXC A
TXC B
SCTE A
SCTE B
TXD A
TXD B
7
SGND
1
SHIELD
VCC VCC VCC
R3 R4
10k 10k
R5
10k
25 DCE/DTE
21 M1
18
M0
4 RTS A
19 RTS B
20 DTR A
23 DTR B
CTS A
CTS B
DSR A
DSR B
8 DCD A
10 DCD B
6
22
DSR A
DSR B
5 CTS A
13 CTS B
DCD A
DCD B
DTR A
DTR B
RTS A
RTS B
1344 TA03
CABLE WIRING FOR MODE SELECTION
MODE
PIN 18 PIN 21
V.35
PIN 7
PIN 7
EIA-530, RS449, NC
PIN 7
V.36, X.21
RS232
PIN 7
NC
CABLE WIRING FOR DTE/DCE
SELECTION
MODE
PIN 25
DTE PIN 7
DCE NC
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 LTC1344CG.PDF ] | |
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