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参数资料
| 型号： | LTC2863IDD-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/26页 |
| 文件大小： | 0K |
| 描述： | IC TRANSCEIVER RS485 8-DFN |
| 标准包装： | 121 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS422，RS485 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x3） |
| 包装： | 管件 |
LTC2862/LTC2863/
LTC2864/LTC2865
16
2862345fc
For more information www.linear.com/LTC2862
The 250kbps mode has the added advantage of reducing
signal reflections in an unterminated network, and there-
by increasing the length of a network that can be used
without termination. Using the rule of thumb that the rise
time of the transmitter should be greater than four times
the one-way delay of the signal, networks of up to 140
feet can be driven without termination.
PROFIBUS Compatible Interface
PROFIBUS is an RS485-based field bus. In addition
to the specifications of TIA/EIA-485-A, the PROFIBUS
specification contains additional requirements for cables,
interconnects, line termination, and signal levels. The
followingdiscussionappliestothePROFIBUSTypeAcables
with associated connectors and termination. The Type A
cable is a twisted pair shielded cable with a characteristic
impedance of 135 to 165 and a loop resistance of
< 110Ω/km.
The LTC2865 family of RS485 transceivers may be used
in PROFIBUS compatible equipment if the following
considerations are implemented. (Please refer to the
schematic of the PROFIBUS Compatible Interface in the
Typical Applications Section.)
1. The polarity of the PROFIBUS signal is opposite to the
polarity convention used in this data sheet. The PRO-
FIBUS B wire is driven by a non-inverted signal, while
the A wire is driven by an inverted signal. Therefore,
it is necessary to swap the output connections from
the transceiver. Pin A is connected to the PROFIBUS B
wire, and Pin B is connected to the PROFIBUS A wire.
2. Each end of the PROFIBUS line is terminated with a
220Ω resistor between B and A, a 390Ω pull-up resis-
tor between B and VCC, and a 390Ω pull-down resistor
be-tweenAandGND.Thisprovidessuitabletermination
for the 150Ω twisted pair transmission cable.
3. The peak to peak differential voltage VOD received at
the end of a 100m cable with the cable and termina-
tions described above must be greater than 4V and less
than 7V. The LTC2865 family produces signal levels in
excess of 7V when driving this network directly. 8.2
resistors may be inserted between the A and B pins of
the transceiver and the B and A pins of the PROFIBUS
cable to attenuate the transmitted signal to meet the
PROFIBUSupperlimitof7Vwhilestillprovidingenough
drive strength to meet the lower limit of 4V.
4. The LTC2865 family transceiver should be powered by
a 5% tolerance 5V supply (4.75V to 5.25V) to ensure
that the PROFIBUS VOD tolerances are met.
Auxiliary Protection For IEC Surge, EFT and ESD
An interface transceiver used in an industrial setting
may be exposed to extremely high levels of electrical
overstress due to phenomena such as lightning surge,
electrical fast transient (EFT) from switching high current
inductive loads, and electrostatic discharge (ESD) from
the discharge of electrically charged personnel or equip-
ment. Test methods to evaluate immunity of electronic
equipment to these phenomenon are defined in the IEC
standards 61000-4-2, 61000-4-4, and 61000-4-5, which
address ESD, EFT, and surge, respectively. The transi-
ents produced by the EFT and particularly the surge tests
contain much more energy than the ESD transients. The
LTC2865 family is designed for high robustness against
ESD, but the on-chip protection is not able to absorb the
energy associated with the 61000-4-5 surge transients.
Therefore,aproperlydesignedexternalprotectionnetwork
is necessary to achieve a high level of surge protection,
and can also extend the ESD and EFT performance of the
LTC2865 family to extremely high levels.
In addition to providing surge, EFT and ESD protection,
an external network should preserve or extend the ability
of the LTC2865 family to withstand overvoltage faults,
operate over a wide common mode, and communicate
at high frequencies. In order to meet the first two
requirements, protection components with suitably high
conduction voltages must be chosen. A means to limit
current must be provided to prevent damage in case
a secondary protection device or the ESD cell on the
LTC2865 family fires and conducts. The capacitance of
thesecomponentsmustbekeptlowinordertopermithigh
frequency communication over a network with multiple
nodes. Meetingtherequirementsforconductingveryhigh
energyelectricaltransientswhilemaintaininghighhold-off
voltages and low capacitance is a considerable challenge.
applicaTions inForMaTion
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| LTC2863IDD-2#PBF | 功能描述:IC TRANSCEIVER RS485 8-DFN RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1 系列:- 类型:线路收发器 驱动器/接收器数:5/3 规程:RS232 电源电压:3 V ~ 5.5 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:Digi-Reel® 产品目录页面:918 (CN2011-ZH PDF) 其它名称:296-25096-6 |
| LTC2863IDD-2#TRPBF | 功能描述:IC TRANSCEIVER RS485 8-DFN RoHS:是 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 |
| LTC2863IS8-1#PBF | 功能描述:IC TRANSCEIVER RS485 8-SOIC 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 |
| LTC2863IS8-1#TRPBF | 功能描述:IC TRANSCEIVER RS485 8-SOIC RoHS:是 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 |
| LTC2863IS8-2#PBF | 功能描述:IC TRANSCEIVER RS485 8-SOIC 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 |
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