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LTC2870_15

更新时间： 2024-11-06 01:19:03
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
42页 1070K
描述
RS232/RS485 Multiprotocol Transceivers with Integrated Termination

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LTC2870_15 数据手册

 浏览型号LTC2870_15的Datasheet PDF文件第2页浏览型号LTC2870_15的Datasheet PDF文件第3页浏览型号LTC2870_15的Datasheet PDF文件第4页浏览型号LTC2870_15的Datasheet PDF文件第5页浏览型号LTC2870_15的Datasheet PDF文件第6页浏览型号LTC2870_15的Datasheet PDF文件第7页 
LTC2870/LTC2871  
RS232/RS485 Multiprotocol  
Transceivers with  
Integrated Termination  
DescripTion  
FeaTures  
The LTC®2870/LTC2871 are robust pin-configurable mul-  
tiprotocol transceivers, supporting RS232, RS485, and  
RS422 protocols, operating on a single 3V to 5.5V supply.  
TheLTC2870canbeconfiguredastwoRS232single-ended  
transceiversoroneRS485differentialtransceiveronshared  
I/O lines. The LTC2871 offers independent control of two  
RS232 transceivers and one RS485 transceiver, each on  
dedicated I/O lines.  
n
One RS485 and Two RS232 Transceivers  
n
3V to 5.5V Supply Voltage  
n
20Mbps RS485 and 500kbps RS232  
n
Automatic Selection of Integrated RS485 (120Ω)  
and RS232 (5kΩ)Termination Resistors  
n
Half-/Full-Duplex RS485 Switching  
n
High ESD: 2ꢀkV (ꢁTC2870), 1ꢀkV (ꢁTC2871)  
n
Logic Loopback Mode  
1.7V to 5.5V Logic Interface  
Supports Up to 256 RS485 Nodes  
n
Pin-controlled integrated termination resistors allow  
for easy interface reconfiguration, eliminating external  
resistors and control relays. Half-duplex switches allow  
four-wire and two-wire RS485 configurations. Loopback  
mode steers the driver inputs to the receiver outputs for  
diagnostic self-test.The RS485 receivers support up to  
256 nodes per bus, and feature full failsafe operation for  
floating, shorted or terminated inputs.  
n
n
RS485 Receiver Failsafe Eliminates UART Lockup  
n
H-Grade Available (–40°C to 125°C)  
n
Available in 28-Pin 4mm × 5mm QFN and  
TSSOP (LTC2870), and 38-Pin 5mm × 7mm QFN  
and TSSOP (LTC2871)  
applicaTions  
An integrated DC/DC boost converter uses a tiny  
2mm × 1.6mm inductor and one capacitor, eliminating  
the need for multiple supplies for driving RS232 levels.  
n
Software Selectable RS232/RS485/RS422 Interface  
n
Point-of-Sale Terminals  
n
Cable Repeaters  
Protocol Translators  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
n
Typical applicaTions  
Protocol Switching with  
Simultaneous Protocols and  
RS485 Termination Switching  
RS485 Duplex Switching  
Automatic Termination Selection  
1.7V TO V  
3V TO 5.5V  
10µH  
1.7V TO V  
3V TO 5.5V  
10µH  
1.7V TO V  
CC  
220nF  
3V TO 5.5V  
10µH  
CC  
CC  
220nF  
220nF  
0.1µF  
2.2µF  
0.1µF  
2.2µF  
0.1µF  
2.2µF  
V
CAP SW  
LTC2870  
V
CC  
V
CAP SW  
LTC2871  
V
CC  
V
L
CAP SW  
LTC2870,  
LTC2871  
V
CC  
L
L
485/232  
TE485  
RS485  
TERMINATION  
RS232 RS485  
Y
DY  
OFF ON  
120Ω  
120Ω  
Y
Y
DI  
DI,  
DY  
Z
Z
Z
A
DZ  
RA  
RO  
RS485  
FULL HALF  
DUPLEX  
B
H/F  
DIN1  
DOUT1  
RIN1  
A
B
A
B
ROUT1  
DIN2  
RO,  
RA  
DOUT2  
RB  
ROUT2  
RIN2  
V
V
EE  
V
DD  
V
EE  
V
DD  
V
DD  
EE  
GND  
GND  
GND  
1µF  
1µF  
1µF  
1µF  
1µF  
1µF  
28701 TA01  
28701fa  
1
For more information www.linear.com/LTC2870  
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