参数资料
| 型号： | LTC1344CG |
| 厂商： | Linear Technology |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC CABLE TERM MULTIPROTCL 24SSOP |
| 标准包装： | 59 |
| 类型： | 缆线 |
| 端子数： | 6 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1355 (CN2011-ZH PDF) |
6
LTC1344
APPLICATIONS INFORMATION
WU
U
Multiprotocol Cable Termination
One of the most difficult problems facing the designer of
a multiprotocol serial interface is how to allow the trans-
mitters and receivers for different electrical standards to
share connector pins. In some cases the transmitters and
receivers for each interface standard can be simply tied
together and the appropriate circuitry enabled. But the
biggest problem still remains: how to switch the various
cable terminations required by the different standards.
Traditional implementations have included switching re-
sistors with expensive relays or requiring the user to
change termination modules every time the interface
standard has changed. Custom cables have been used
with the termination in the cable head or separate termina-
tions are built on the board, and a custom cable routes the
signals to the appropriate termination. Switching the
terminations using FETs is difficult because the FETs must
remain off even though the signal voltage is beyond the
supply voltage for the FET drivers or the power is off.
The LTC1344 solves the cable termination switching prob-
lem via software control. The LTC1344 provides termina-
tion for the V.10 (RS423), V.11 (RS422), V.28 (RS232)
and V.35 electrical protocols.
V.10 (RS423) Termination
A typical V.10 unbalanced interface is shown in Figure 4.
A V.10 single-ended generator output A with ground C is
connected to a differential receiver with inputs A
' con-
nected to A and input B
' connected to the signal return
ground C. The receiver’s ground C
' is separate from the
signal return. Usually no cable termination is required for
V.10 interfaces but the receiver inputs must be compliant
with the impedance curve shown in Figure 5.
In V.10 mode, both switches S1 and S2 are turned off so
the only cable termination is the input impedance of the
V.10 receiver.
A
CABLE
TERMINATION
LOAD
GENERATOR
BALANCED
INTERCONNECTING
CABLE
RECEIVER
A
'
C
B
'
C
'
1344 F04
Figure 4. Typical V.10 Interface
V.11 (RS422) Termination
A typical V.11 balanced interface is shown in Figure 6. A
V.11 differential generator with outputs A and B with
ground C is connected to a differential receiver with
ground C
', inputs A' connected to A, B' connected to B. The
V.11 interface requires a different termination at the re-
ceiver end that has a minimum value of 100
.Thereceiver
inputs must also be compliant with the impedance curve
shown in Figure 7.
In V.11 mode, switch S1 is turned on and S2 is turned off
so the cable is terminated with a 103
impedance.
Figure 5. V.10 Interface Using the LTC1344
Z
S2
OFF
124
LTC1344
V.10
RECEIVER
A
B
C
1344 F05
51.5
51.5
IZ
–3V
3V
10V
–10V
– 3.25mA
3.25mA
VZ
S1
OFF
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1345ISW#TRPBF | IC TXRX V.35 SINGL SUPPLY 28SOIC |
| LTC1346ACSW#TRPBF | IC TXRX V.35 DCE/DTE 24-SOIC |
| LTC1347CSW#TRPBF | IC TXRX 5V RS232 LOW PWR 28-SOIC |
| LTC1348ISW | IC TXRX 3.3V/5V RS232 28-SOIC |
| LTC1349IG#TRPBF | IC TXRX 5V RS232 LOW PWR 28-SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1344CG#PBF | 功能描述:IC CABLE TERM MULTIPROTCL 24SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 信号终端器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:SCSI，SE 端子数:9 电源电压:4 V ~ 5.25 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:管件 |
| LTC1344CG#TR | 功能描述:IC TERMINATOR CABLE MULTI 24SSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 信号终端器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:SCSI，SE 端子数:9 电源电压:4 V ~ 5.25 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:管件 |
| LTC1344CG#TRPBF | 功能描述:IC CABLE TERM MULTIPROTCL 24SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 信号终端器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:SCSI，SE 端子数:9 电源电压:4 V ~ 5.25 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:管件 |
| LTC1344IG | 功能描述:IC CABLE TERM MULTIPROTCL 24SSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 信号终端器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:SCSI，SE 端子数:9 电源电压:4 V ~ 5.25 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:管件 |
| LTC1344IG#PBF | 功能描述:IC CABLE TERM MULTIPROTCL 24SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 信号终端器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:SCSI，SE 端子数:9 电源电压:4 V ~ 5.25 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:管件 |
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