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參數(shù)資料
| 型號： | LTC487ISW |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DVR RS485 LOW PWR QUAD 16SOIC |
| 標準包裝： | 47 |
| 類型： | 驅動器 |
| 驅動器/接收器數(shù)： | 4/0 |
| 規(guī)程： | RS422，RS485 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 16-SOIC |
| 包裝： | 管件 |
LTC487
487fc
TesT circuiT
applicaTions inForMaTion
LTC487 TA02
A
B
R
OD
V
OC
V
DRIVER 1
LTC487 TA03
DI
A
B
EN12
RDIFF
CL1
CL2
LTC487 TA04
OUTPUT
UNDER TEST
CL
S1
500
CC
V
S2
Figure 5. Driver Timing Test Load #2
Figure 4. Driver Timing Test Circuit
Figure 3. Driver DC Test Load
Typical Application
A typical connection of the LTC487 is shown in Figure 6.
A twisted pair of wires connect up to 32 drivers and
receivers for half duplex data transmission. There are
no restrictions on where the chips are connected to the
wires, and it isn’t necessary to have the chips connected
at the ends. However, the wires must be terminated only at
the ends with a resistor equal to their characteristic im-
pedance, typically 120. The optional shields around the
twistedpairhelpreduceunwantednoise,andareconnected
to GND at one end.
Thermal Shutdown
TheLTC487hasathermalshutdownfeaturewhichprotects
the part from excessive power dissipation. If the outputs
of the driver are accidently shorted to a power supply or
low impedance source, up to 250mA can flow through
the part. The thermal shutdown circuit disables the driver
outputs when the internal temperature reaches 150°C and
turns them back on when the temperature cools to 130°C.
If the outputs of two or more LTC487 drivers are shorted
directly, the driver outputs can not supply enough cur-
rent to activate the thermal shutdown. Thus, the thermal
shutdown circuit will not prevent contention faults when
two drivers are active on the bus at the same time.
Cable and Data Rate
The transmission line of choice for RS485 applications is
a twisted pair. There are coaxial cables (twinaxial) made
for this purpose that contain straight pairs, but these are
less flexible, more bulky, and more costly than twisted
pairs. Many cable manufacturers offer a broad range of
120 cables designed for RS485 applications.
EN12
4
LTC487 TA07
120
DX
1
2
3
SHIELD
120
RX
SHIELD
3
DX
EN12
4
2
EN12
4
1
2
3
RX
3
DX
EN12
4
1
DX
1/4 LTC489
1/4 LTC487
1/4 LTC489
1/4 LTC487
2
1
Figure 6. Typical Connection
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC487ISW#PBF | 功能描述:IC DVR RS485 LOW PWR QUAD 16SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| LTC487ISW#TR | 功能描述:IC DRIVER RS485 QUAD LP 16SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| LTC487ISW#TRPBF | 功能描述:IC DVR RS485 LOW PWR QUAD 16SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| LTC488CN | 功能描述:IC LINE RCVR RS485 QUAD 16-DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| LTC488CN#PBF | 功能描述:IC LINE RCVR RS485 QUAD 16-DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓模塊:RS-232 & USB Transceiver 標準包裝:2,000 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 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-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
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