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SN65LBC182_07 PDF预览

SN65LBC182_07

更新时间: 2024-11-09 04:51:15
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德州仪器 - TI 总线收发器
页数 文件大小 规格书
18页 336K
描述
DIFFERENTIAL BUS TRANSCEIVER

SN65LBC182_07 数据手册

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ꢀꢁꢂ ꢃꢄ ꢅꢆ ꢇꢈ ꢉ  
ꢀꢁꢊ ꢃꢄ ꢅꢆ ꢇꢈ ꢉ  
SLLS500A − MAY 2001 − REVISED MARCH 2005  
The driver outputs and the receiver inputs connect  
internally to form a differential input/output (I/O) bus port  
that is designed to offer minimum loading to the bus.  
This port operates over a wide range of common-mode  
voltage, making the device suitable for party-line  
applications. The device also includes additional  
features for party-line data buses in electrically noisy  
environment applications such as industrial process  
control or power inverters.  
FEATURES  
D
D
One-Fourth Unit Load Allows up to 128  
Devices on a Bus  
ESD Protection for Bus Terminals:  
15-kV Human Body Model  
8-kV IEC61000-4-2, Contact Discharge  
15-kV IEC61000-4-2, Air-Gap Discharge  
D
D
Meets or Exceeds the Requirements of ANSI  
Standard TIA/EIA-485-A and ISO 8482: 1987(E)  
The SN75LBC182 and SN65LBC182 bus pins also  
exhibit a high input resistance equivalent to one-fourth  
unit load allowing connection of up to 128 similar  
devices on the bus. The high ESD tolerance protects  
the device for cabled connections. (For an even higher  
level of protection, see the SN65/75LBC184, literature  
number SLLS236.)  
Controlled Driver Output-Voltage Slew Rates  
Allow Longer Cable Stub Lengths  
D
D
D
D
D
D
Designed for Signaling Rates Up to 250-kbps  
Low Disabled Supply Current . . . 250 µA Max  
Thermal Shutdown Protection  
Open-Circuit Fail-Safe Receiver Design  
Receiver Input Hysteresis . . . 70 mV Typ  
The  
differential  
driver  
design  
incorporates  
slew-rate-controlled outputs sufficient to transmit data  
up to 250 kbps. Slew-rate control allows longer  
unterminated cable runs and longer stub lengths from  
the main backbone than possible with uncontrolled  
voltage transitions. The receiver design provides a  
fail-safe output of a high level when the inputs are left  
floating (open circuit). Very low device supply current  
can be achieved by disabling the driver and the receiver.  
Glitch-Free Power-Up and Power-Down  
Protection  
APPLICATIONS  
D
D
D
Utility Meters  
Industrial Process Control  
Building Automation  
The SN65LBC182 is characterized for operation from  
−40°C to 85°C, and the SN75LBC182 is characterized  
for operation from 0°C to 70°C.  
DESCRIPTION  
The SN65LBC182 and SN75LBC182 are differential  
data line transceivers with a high level of ESD protection  
in the trade-standard footprint of the SN75176. They are  
designed for balanced transmission lines and meet  
ANSI standard TIA/EIA-485-A and ISO 8482. The  
SN65LBC182 and SN75LBC182 combine a 3-state,  
differential line driver and differential input line receiver,  
both of which operate from a single 5-V power supply.  
The driver and receiver have active-high and active-low  
enables, respectively, which can be externally  
connected together to function as a direction control.  
functional block diagram  
3
DE  
6
A
B
4
2
D
RE  
R
7
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
The signaling rate of a line, is the number of voltage transitions that are made per second expressed in the units bps (bits per second).  
ꢐꢡ  
Copyright 2001, Texas Instruments Incorporated  
ꢝ ꢡ ꢞ ꢝꢖ ꢗꢫ ꢙꢘ ꢜ ꢤꢤ ꢢꢜ ꢚ ꢜ ꢛ ꢡ ꢝ ꢡ ꢚ ꢞ ꢦ  
ꢜꢚ  
1
www.ti.com  

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