Datasheet Linear Technology LTC1687

Manufacturer	Linear Technology
Series	LTC1687

52Mbps Precision Delay RS485 Fail-Safe Transceivers

Datasheets

PDF, 189 Kb, Revision: S, File uploaded: Nov 12, 2017

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Packaging

	LTC1687CS#PBF	LTC1687CS#TRPBF	LTC1687IS#PBF	LTC1687IS#TRPBF
N	1	2	3	4
Package	SO-14 Package Outline Drawing	SO-14 Package Outline Drawing	SO-14 Package Outline Drawing	SO-14 Package Outline Drawing
Package Code	S	S	S	S
Package Index	05-08-1610 (S14)	05-08-1610 (S14)	05-08-1610 (S14)	05-08-1610 (S14)
Pin Count	14	14	14	14

Parametrics

Parameters / Models	LTC1687CS#PBF	LTC1687CS#TRPBF	LTC1687IS#PBF	LTC1687IS#TRPBF
Configuration	Full-Duplex	Full-Duplex	Full-Duplex	Full-Duplex
Drivers	1	1	1	1
ESD, kV	4	4	4	4
Export Control	no	no	no	no
Failsafe	Open	Open	Open	Open
Fault Protection	-7, +12	-7, +12	-7, +12	-7, +12
Isupply, mA	7	7	7	7
Max Data Rate, Mbps	52	52	52	52
Operating Temperature Range, °C	0 to 70	0 to 70	-40 to 85	-40 to 85
Protocols Supported	TIA/EIA-485, -422	TIA/EIA-485, -422	TIA/EIA-485, -422	TIA/EIA-485, -422
Receivers	1	1	1	1
Shutdown	no	no	no	no
Supply Voltage Range	5	5	5	5

Eco Plan

	LTC1687CS#PBF	LTC1687CS#TRPBF	LTC1687IS#PBF	LTC1687IS#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Other Options

Design Notes

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RS485 Transceivers Operate at 52Mbps Over 100 Feet of Unshielded Twisted Pair &mdash DN168
PDF, 89 Kb, File published: Nov 1, 1997
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RS485 Transceivers Operate at 52Mbps Over 100 Feet of
Unshielded Twisted Pair вЂ“ Design Note 168
Victor Fleury
The propagation delay of typical RS485 transceivers can vary by as much as 500% over process and
temperature. In applications where high speed clock
and data waveforms are sent over long distances,
propagation delay and skew uncertainties can pose
system design constraints and limit the maximum
data rate. The LTC В®1685 high speed RS485 transceiver
family addresses this problem by guaranteeing over
temperature a precision propagation delay of 18.5ns
В±3.5ns, a better than ten times improvement over other
CMOS transceivers.
The LTC1685 is geared for half-duplex operation,
whereas the LTC1686/LTC1687 can operate in fullduplex mode. All include a receiver fail-safe feature,
whereby the receiver output remains in a high state
over the entire 12V to вЂ“7V common mode range when
the inputs are left open or shorted together. A novel
protection technique permits indeп¬Ѓnite short circuiting
of the driver and receiver outputs to supply or ground,
while limiting the current to 20mA.
HIGH SPEED DIFFERENTIAL SCSI
(FAST-20/FAST-40 HVD) …

Model Line

Series: LTC1687 (4)

LTC1687CS#PBF LTC1687CS#TRPBF LTC1687IS#PBF LTC1687IS#TRPBF

Manufacturer's Classification

Interface > RS485/RS422 Transceivers

Slices

Microcontrollers