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LTC1687IS#PBF

Description
Single Transmitter/Receiver RS-422/RS-485 14-Pin SOIC N Tube
File Size177KB,12 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC1687IS#PBF Overview

Single Transmitter/Receiver RS-422/RS-485 14-Pin SOIC N Tube

LTC1687IS#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
FunctionLine Transceiver
Data Rate50Mbps
Transmitter Communication TypeRS-422|RS-485
Receiver Communication TypeRS-422|RS-485
Interface StandardsRS-485
Data Transmission TopologyMultidrop|Multipoint
Number of Transceivers1
Number of Transmitters1
Number of Receivers1
Transmitter Signal TypeDifferential
Receiver Signal TypeDifferential
Number of Drivers per Line1@RS-422|32@RS-485
Number of Receivers per Line1@RS-422|32@RS-485
Driving Mode3-State
Number of Transmitter Enables1
Number of Receiver Enables1
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Power Supply TypeSingle
Typical Single Supply Voltage (V)5
Maximum Supply Current (mA)12
Supplier Temperature GradeIndustrial
PackagingTube
Pin Count14
Supplier PackageSOIC N
Standard Package NameSOP
MountingSurface Mount
Package Height1.5(Max)
Package Length8.74(Max)
Package Width3.99(Max)
PCB changed14
Lead ShapeGull-wing
LTC1686/LTC1687
52Mbps Precision Delay
RS485 Fail-Safe Transceivers
FEATURES
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DESCRIPTION
The LTC
®
1686/LTC1687 are high speed, precision delay,
full-duplex RS485 transceivers that can operate at data
rates as high as 52Mbps. The devices also meet the
requirements of RS422.
A unique architecture provides very stable propagation
delays and low skew over a wide common mode and
ambient temperature range.
The driver and receiver feature three-state outputs, with
disabled driver outputs maintaining high impedance over
the entire common mode range. A short-circuit feature
detects shorted outputs and substantially reduces driver
output current. A similar feature also protects the receiver
output from short circuits. Thermal shutdown circuitry
protects from excessive power dissipation.
The receiver has a fail-safe feature that guarantees a high
output state when the inputs are shorted or are left floating.
The LTC1686/LTC1687 RS485 transceivers guarantee
receiver fail-safe operation over the
entire
common mode
range (– 7V to 12V). Receiver input resistance remains
22k when the device is unpowered or disabled.
The LTC1686/LTC1687 operate from a single 5V supply
and draw only 7mA of supply current.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Precision Propagation Delay Over Temperature:
Receiver/Driver: 18.5ns
±
3.5ns
High Data Rate:
52Mbps
Low t
PLH
/t
PHL
Skew:
Receiver/Driver: 500ps Typ
–7V to 12V RS485 Input Common Mode Range
Guaranteed Fail-Safe Operation Over the Entire
Common Mode Range
High Input Resistance:
22k, Even When Unpowered
Short-Circuit Protected
Thermal Shutdown Protected
Driver Maintains High Impedance in Three-State or
with Power Off
Single 5V Supply
Pin Compatible with LTC490/LTC491
45dB CMRR at 26MHz
APPLICATIONS
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High Speed RS485/RS422 Full Duplex Transceivers
Level Translator
Backplane Transceiver
STS-1/OC-1 Data Transceiver
Signal Repeaters
TYPICAL APPLICATION
LTC1686
5
D
3
DRIVER
100Ω
6
100Ω
RECEIVER
R
LTC1686
2V/DIV
1V/DIV
8
R
2
RECEIVER
100Ω
7
100Ω
DRIVER
D
5V/DIV
RECEIVER
OUTPUT
400 FT OF CATEGORY 5 UTP
100ns/DIV
1686/87 TA02
LTC1686/87 • TA01
U
U
U
10Mbps Data Pulse
400 Feet Category 5 UTP
DRIVER INPUT
CABLE DELAY
RECEIVER
INPUT
1
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