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| 型号： | LTC487ISW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC DVR RS485 LOW PWR QUAD 16SOIC |
| 标准包装： | 47 |
| 类型： | 驱动器 |
| 驱动器/接收器数： | 4/0 |
| 规程： | RS422，RS485 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC488CN | 功能描述:IC LINE RCVR RS485 QUAD 16-DIP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC488CN#PBF | 功能描述:IC LINE RCVR RS485 QUAD 16-DIP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:RS-232 & USB Transceiver 标准包装:2,000 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SSOP（0.209"，5.30mm 宽） 供应商设备封装:16-SSOP 包装:带卷 (TR) 其它名称:296-19849-2 |
| LTC488CNPBF | 制造商:Linear Technology 功能描述:LTC488CNPBF |
| LTC488CS | 制造商:Linear Technology 功能描述:Quad RS485 Line Receiver |
| LTC488CSW | 功能描述:IC LINE RCVR RS485 QUAD 16-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
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