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參數(shù)資料
| 型號： | LTC1344IG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Software-Selectable Cable Terminator |
| 中文描述： | 6-LINE 104 ohm OTHER TERMINATOR, PDSO24 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 252K |
| 代理商： | LTC1344IG |
6
LTC1344
APPLICATIO
S I
N
FOR
ATIO
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.
W
U
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
. The receiver
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
Z
Z
S2
OFF
124
LTC1344
V.10
RECEIVER
A
B
C
1344 F05
51.5
51.5
I
Z
–3V
3V
10V
–10V
–3.25mA
3.25mA
V
Z
S1
OFF
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| LTC1344IG#PBF | 功能描述:IC CABLE TERM MULTIPROTCL 24SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 信號終端器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:SCSI，SE 端子數(shù):9 電源電壓:4 V ~ 5.25 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:管件 |
| LTC1344IG#TR | 功能描述:IC TERMINATOR CABLE MULTI 24SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 信號終端器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:SCSI，SE 端子數(shù):9 電源電壓:4 V ~ 5.25 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:管件 |
| LTC1344IG#TRPBF | 功能描述:IC CABLE TERM MULTIPROTCL 24SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 信號終端器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:SCSI，SE 端子數(shù):9 電源電壓:4 V ~ 5.25 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:管件 |
| LTC1345CNW | 功能描述:IC TXRX V.35 SINGLE SUPPLY 28DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
| LTC1345CNW#PBF | 功能描述:IC TXRX V.35 SINGLE SUPPLY 28DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
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