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參數(shù)資料
| 型號： | LTC487CN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Quad Low Power RS485 Driver |
| 中文描述： | QUAD LINE DRIVER, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 225K |
| 代理商： | LTC487CN |
5
LTC487
TEST CIRCUITS
LTC487 TA04
OUTPUT
UNDER TEST
C
L
S1
500
CC
V
S2
Figure 5. Driver Timing Test Load #2
DRIVER 1
LTC487 TA03
DI
A
B
EN12
R
DIFF
C
L1
C
L2
Figure 4. Driver Timing Test Circuit
LTC487 TA02
A
B
R
R
OD
V
OC
V
Figure 3. Driver DC Test Load
U
S
A
O
PPLICATI
IU
U
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
impedance, typically 120
. The optional shields around
the twisted pair help reduce unwanted noise, and are
connected to GND at one end.
Thermal Shutdown
The LTC487 has a thermal shutdown feature which pro-
tects 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 current to activate the thermal shutdown.
Thus, the thermal shutdown circuit will not prevent con-
tention 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.
Figure 6. Typical Connection
EN12
4
LTC487 TA07
120
DX
1
2
3
SHIELD
120
RX
RX
SHIELD
3
DX
EN12
4
2
EN12
4
1
2
3
RX
RX
3
DX
EN12
4
1
DX
1/4 LTC489
1/4 LTC487
1/4 LTC489
1/4 LTC487
2
1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC487CS | Quad Low Power RS485 Driver |
| LTC487IN | Quad Low Power RS485 Driver |
| LTC487IS | Quad Low Power RS485 Driver |
| LTC5533 | 300MHz to 11GHz Precision Dual RF Power Detector |
| LTC5533EDE | 300MHz to 11GHz Precision Dual RF Power Detector |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC487CN#PBF | 功能描述:IC DVR RS485 LOW PWR QUAD 16-DIP 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:1 系列:- 類型:線路收發(fā)器 驅(qū)動器/接收器數(shù):5/3 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:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:Digi-Reel® 產(chǎn)品目錄頁面:918 (CN2011-ZH PDF) 其它名稱:296-25096-6 |
| LTC487CNPBF | 制造商:Linear Technology 功能描述:Quad RS485 line driver,LTC487CN DIP16 |
| LTC487CSW | 功能描述:IC DVR RS485 LOW PWR QUAD 16SOIC 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:27 系列:- 類型:收發(fā)器 驅(qū)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(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
| LTC487CSW#PBF | 功能描述:IC DVR RS485 LOW PWR QUAD 16SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，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:- 類型:收發(fā)器 驅(qū)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(yīng)商設(shè)備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
| LTC487CSW#PBF | 制造商:Linear Technology 功能描述:RS485 Driver IC |
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