Datasheet Linear Technology LTC1685

Manufacturer	Linear Technology
Series	LTC1685

52Mbps, Precision Delay, RS485 Fail-Safe Transceiver

Datasheets

PDF, 190 Kb, Revision: A, File uploaded: Nov 12, 2017

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Prices

Packaging

	LTC1685CS8#PBF	LTC1685CS8#TRPBF	LTC1685IS8#PBF	LTC1685IS8#TRPBF
N	1	2	3	4
Package	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing
Package Code	S8	S8	S8	S8
Package Index	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)
Pin Count	8	8	8	8

Parametrics

Parameters / Models	LTC1685CS8#PBF	LTC1685CS8#TRPBF	LTC1685IS8#PBF	LTC1685IS8#TRPBF
Configuration	Half-Duplex	Half-Duplex	Half-Duplex	Half-Duplex
Drivers	1	1	1	1
ESD, kV	4	4	4	4
Export Control	no	no	no	no
Failsafe	Idle, Open, Short	Idle, Open, Short	Idle, Open, Short	Idle, Open, Short
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

	LTC1685CS8#PBF	LTC1685CS8#TRPBF	LTC1685IS8#PBF	LTC1685IS8#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

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: LTC1685 (4)

LTC1685CS8#PBF LTC1685CS8#TRPBF LTC1685IS8#PBF LTC1685IS8#TRPBF

Manufacturer's Classification

Interface > RS485/RS422 Transceivers

EMS supplier

Slices

Microcontrollers