APPLICATIONS INFOR
參數(shù)資料
型號(hào)： LTC1343IGW
廠商： Linear Technology
文件頁(yè)數(shù)： 3/28頁(yè)
文件大?。?/td> 0K
描述： IC TXRX SOFTWARE-SELECTBL 44SSOP
標(biāo)準(zhǔn)包裝： 27
類(lèi)型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 4/4
規(guī)程： 多協(xié)議
電源電壓： 4.75 V ~ 5.25 V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 44-BSOP（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 44-SSOP
包裝： 管件
11
LTC1343
APPLICATIONS INFORMATION
WU
U
Figure 12: Mode Selection by the Controller
has a unique data latch signal which acts as a write enable.
When the LATCH pin is low the buffers on the M0, M1, M2,
CTRL/CLK, DCE/DTE, LB and EC pins are transparent.
When the LATCH pin is pulled high the buffers latch the
data and changes on the input pins will no longer affect
the chip.
The mode selection may also be accomplished by using
jumpers to connect the mode pins to ground or VCC.
Cable Termination
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 termi-
nations are built on the board and a custom cable routes
the signals to the appropriate termination. Switching the
terminations with 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.
Using the LTC1344 along with the LTC1343 solves the
cable termination switching problem. Via software con-
trol, the LTC1344 provides termination for the V.10
(RS423), V.11 (RS422), V.28 (RS232) and V.35 electrical
protocols.
V.10 (RS423) Interface
A typical V.10 unbalanced interface is shown in Figure 13.
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 14.
Figure 14. V.10 Receiver Input Impedance
Figure 13. Typical V.10 Interface
1343 F12
CONTROLLER
PORT #3
M0
M1
M2
DCE/DTE
LATCH 1
LATCH 2
LATCH 3
M0
M1
M2
DCE/DTE
LATCH
PORT #2
M0
M1
M2
DCE/DTE
LATCH
PORT #1
M0
M1
M2
DCE/DTE
LATCH
CONNECTOR
#1
CONNECTOR
#2
CONNECTOR
#3
AA
'
CB
'
C
'
GENERATOR
BALANCED
INTERCONNECTING
CABLE
LOAD
CABLE
TERMINATION
RECEIVER
1343 F13
IZ
VZ
–10V
–3.25mA
3.25mA
–3V
3V
10V
1343 F14
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參數(shù)描述
LTC1343IGW#PBF 功能描述:IC TXRX SOFTWARE-SELECTBL 44SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:RS-232 & USB Transceiver 標(biāo)準(zhǔn)包裝:2,000 系列:- 類(lèi)型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):1/1 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類(lèi)型:表面貼裝 封裝/外殼:16-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱(chēng):296-19849-2
LTC1343IGW#TR 功能描述:IC TXRX SOFTWARE SELECT 44SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類(lèi)型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類(lèi)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)
LTC1343IGW#TRPBF 功能描述:IC TXRX SOFTWARE-SELECTBL 44SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類(lèi)型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類(lèi)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)
LTC1344ACG 功能描述:IC CABLE TERM MULTIPROTCL 24SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> 接口 - 信號(hào)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(lèi)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(lèi)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
LTC1344ACG#PBF 功能描述:IC CABLE TERM MULTIPROTCL 24SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 信號(hào)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(lèi)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(lèi)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
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