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参数资料
| 型号： | LTC2859IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/18页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485 20MBPS 10-DFN |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS485 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
LTC2859/LTC2861
11
285961fc
Receiver and Failsafe
With the receiver enabled, when the absolute value of the
differentialvoltagebetweentheAandBpinsisgreaterthan
200mV, the state of RO will reflect the polarity of (A-B).
The LTC2859/LTC2861 have a failsafe feature that guaran-
tees the receiver output to be in a logic HIGH state when
the inputs are either shorted, left open, or terminated
(externally or internally), but not driven for more than
about 3s. The delay prevents signal zero crossings from
being interpreted as shorted inputs and causing RO to go
high inadvertently. This failsafe feature is guaranteed to
work for inputs spanning the entire common mode range
of –7V to +12V.
The receiver output is internally driven high (to VCC) or
low (to ground) with no external pull-up needed. When the
receiver is disabled the RO pin becomes Hi-Z with leakage
of less than ±1A for voltages within the supply range.
Receiver Input Resistance
The receiver input resistance from A or B to ground is
greater than 96k permitting up to a total of 256 receivers
per system without exceeding the RS485 receiver load-
ing specification. High temperature H-Grade operation
reduces the minimum input resistance to 48k permitting
128 receivers on the bus. The input resistance of the
receiver is unaffected by enabling/disabling the receiver
or by powering/unpowering the part. The equivalent input
resistance looking into A and B is shown in Figure 9.
Switchable Termination
Proper cable termination is very important for good signal
fidelity. If the cable is not terminated with its characteristic
impedance, reflections will result in distorted waveforms.
The LTC2859/LTC2861 are the first RS485 transceivers
to offer integrated switchable termination resistors on the
receiver input pins. This provides the tremendous advan-
tage of being able to easily change, through logic control,
the proper line termination for optimal performance when
configuring transceiver networks.
When the TE pin is high, the termination resistor is en-
abled and the differential resistance from A to B is 120.
Figure 10 shows the I/V characteristics between pins A
and B with the termination resistor enabled and disabled.
The resistance is maintained over the entire RS485 com-
mon mode range of –7V to +12V as shown in Figure 11.
Figure 10. Curve Trace Between A and B
with Termination Enabled and Disabled
Figure 9. Equivalent Input Resistance into A and B
(on the LTC2859, Valid if Driver is Disabled)
applicaTions inFormaTion
60
A
TE
B
2859/61 F09
>96k
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2861CDE#PBF | 功能描述:IC TXRX RS485 20MBPS 12-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 |
| LTC2861CDE#TRPBF | 功能描述:IC TXRX RS485 20MBPS 12-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:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
| LTC2861CGN#PBF | 功能描述:IC TXRX RS485 20MBPS 16-SSOP 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 |
| LTC2861CGN#TRPBF | 功能描述:IC TXRX RS485 20MBPS 16-SSOP 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:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
| LTC2861IDE#PBF | 功能描述:IC TXRX RS485 20MBPS 12-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 |
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