LT1785CS8 datasheet, PDF - EEWORLD Datasheet

LT1785CS8: DescriptionSingle Transmitter/Receiver RS-422/RS-485 8-Pin SOIC N; File Size241KB，18 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LT1785CS8 Overview

Single Transmitter/Receiver RS-422/RS-485 8-Pin SOIC N

LT1785CS8 Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Not Compliant
ECCN (US)	EAR99
Part Status	Unconfirmed
HTS	8542.39.00.01
SVHC	Yes
SVHC Exceeds Threshold	Yes
Function	Line Transceiver
Data Rate	250Kbps(Min)
Transmitter Communication Type	RS-422\|RS-485
Receiver Communication Type	RS-422\|RS-485
Interface Standards	RS-422\|RS-485
Data Transmission Topology	Multidrop\|Multipoint
Number of Transceivers	1
Number of Transmitters	1
Number of Receivers	1
Transmitter Signal Type	Differential
Receiver Signal Type	Differential
Number of Drivers per Line	1@RS-422\|32@RS-485
Number of Receivers per Line	1@RS-422\|32@RS-485
Driving Mode	3-State
Number of Transmitter Enables	1
Number of Receiver Enables	1
Minimum Operating Temperature (°C)	0
Maximum Operating Temperature (°C)	70
Power Supply Type	Single
Minimum Single Supply Voltage (V)	4.75
Typical Single Supply Voltage (V)	5
Maximum Single Supply Voltage (V)	5.25
Maximum Supply Current (mA)	9
Supplier Temperature Grade	Commercial
Pin Count	8
Supplier Package	SOIC N
Standard Package Name	SOP
Mounting	Surface Mount
Package Height	1.5(Max)
Package Length	5(Max)
Package Width	3.99(Max)
PCB changed	8
Lead Shape	Gull-wing

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LT1785/LT1785A/

LT1791/LT1791A

60V Fault Protected

RS485/RS422 Transceivers

FeaTures

DescripTion

The

1785/LT1791

are half-duplex and full-duplex differ-

ential bus transceivers for RS485 and RS422 applications

which feature on-chip protection from overvoltage faults

on the data transmission lines. Receiver input and driver

output pins can withstand voltage faults up to ±60V with

respect to ground with no damage to the device. Faults

may occur while the transceiver is active, shut down or

powered off.

Data rates to 250kbaud on networks of up to 128 nodes

are supported. Controlled slew rates on the driver out-

putscontrol EMI emissions and improve data transmis-

sion integrity on improperly terminated lines. Drivers are

specified to operate with inexpensive cables as low as

72Ω characteristic impedance.

The LT1785A/LT1791A devices have “fail-safe” receiver

inputs to guarantee a receiver output high for shorted, open

or inactive data lines. On-chip ESD protection eliminates

need for external protection devices.

The LT1785/LT1785A are available in 8-lead DIP and SO

packages and the LT1791/LT1791A in 14-lead DIP and

SO packages.

Protected from Overvoltage Line Faults to ±60V

Pin Compatible with LTC485 and LTC491

High Input Impedance Supports Up to 128 Nodes

No Damage or Latchup to ESD

IEC-1000-4-2 Level 4: ±15kV Air Discharge

IEC-1000-4-2 Level 2: ±4kV Contact Discharge

Controlled Slew Rates for EMI Emissions Control

Guaranteed High Receiver Output State for Floating,

Shorted or Inactive Inputs (LT1785A/LT1791A)

Outputs Assume a High Impedance When Off or

Powered Down

Drives Low Cost, Low Impedance Cables

Short-Circuit Protection on All Outputs

Thermal Shutdown Protection

Guaranteed Operation to 125°C

applicaTions

Industrial Control Data Networks

CAN Bus Applications

HVAC Controls

LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of

Linear Technology Corporation. All other trademarks are the property of their respective owners.

Typical applicaTion

Normal Operation Waveforms at 250kBaud

RO1

RE1

DE1

DI1

LT1785

GND1

CC1

TERM

Y-Z

RO2

RE2

DE2

DI2

LT1785

CC2

TERM

178591 TA02

GND2

178591 TA01

178591fd

For more information

www.linear.com/LT1785

LT1785CS8 Related Products

	LT1785CS8	LT1785CS8#TR	LT1785IN8	LT1785IS8#TR	LT1785IS8	LT1785IS8SL30482#PBF
Description	Single Transmitter/Receiver RS-422/RS-485 8-Pin SOIC N	Single Transmitter/Receiver RS-422/RS-485 8-Pin SOIC N T/R	Single Transmitter/Receiver RS-422/RS-485 8-Pin PDIP N	Single Transmitter/Receiver RS-422/RS-485 8-Pin SOIC N T/R	Single Transmitter/Receiver RS-422/RS-485 8-Pin SOIC N	Single Transmitter/Receiver RS-422/RS-485 8-Pin SOIC N Tube
EU restricts the use of certain hazardous substances	Not Compliant	Not Compliant	Not Compliant	Not Compliant	Not Compliant	Compliant
ECCN (US)	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Part Status	Unconfirmed	Unconfirmed	Unconfirmed	Unconfirmed	Unconfirmed	Active
Function	Line Transceiver	Line Transceiver	Line Transceiver	Line Transceiver	Line Transceiver	Line Transceiver
Data Rate	250Kbps(Min)	250Kbps(Min)	250Kbps(Min)	250Kbps(Min)	250Kbps(Min)	250Kbps(Min)
Transmitter Communication Type	RS-422\|RS-485	RS-485\|RS-422	RS-422\|RS-485	RS-422\|RS-485	RS-422\|RS-485	RS-485\|RS-422
Receiver Communication Type	RS-422\|RS-485	RS-485\|RS-422	RS-422\|RS-485	RS-422\|RS-485	RS-422\|RS-485	RS-485\|RS-422
Interface Standards	RS-422\|RS-485	RS-485\|RS-422	RS-422\|RS-485	RS-422\|RS-485	RS-422\|RS-485	RS-485\|RS-422
Data Transmission Topology	Multidrop\|Multipoint	Multipoint\|Multidrop	Multidrop\|Multipoint	Multidrop\|Multipoint	Multidrop\|Multipoint	Multipoint\|Multidrop
Number of Transceivers	1	1	1	1	1	1
Number of Transmitters	1	1	1	1	1	1
Number of Receivers	1	1	1	1	1	1
Transmitter Signal Type	Differential	Differential	Differential	Differential	Differential	Differential
Receiver Signal Type	Differential	Differential	Differential	Differential	Differential	Differential
Number of Drivers per Line	1@RS-422\|32@RS-485	32@RS-485\|1@RS-422	1@RS-422\|32@RS-485	1@RS-422\|32@RS-485	1@RS-422\|32@RS-485	32@RS-485\|1@RS-422
Number of Receivers per Line	1@RS-422\|32@RS-485	32@RS-485\|10@RS-422	10@RS-422\|32@RS-485	10@RS-422\|32@RS-485	1@RS-422\|32@RS-485	32@RS-485\|10@RS-422
Driving Mode	3-State	3-State	3-State	3-State	3-State	3-State
Number of Transmitter Enables	1	1	1	1	1	1
Number of Receiver Enables	1	1	1	1	1	1
Minimum Operating Temperature (°C)	-	-	-40	-40	-40	-40
Maximum Operating Temperature (°C)	70	70	85	85	85	85
Power Supply Type	Single	Single	Single	Single	Single	Single
Minimum Single Supply Voltage (V)	4.75	4.75	4.75	4.75	4.75	4.75
Typical Single Supply Voltage (V)	5	5	5	5	5	5
Maximum Single Supply Voltage (V)	5.25	5.25	5.25	5.25	5.25	5.25
Maximum Supply Current (mA)	9	9	9	9	9	9
Supplier Temperature Grade	Commercial	Commercial	Industrial	Industrial	Industrial	Industrial
Pin Count	8	8	8	8	8	8
Supplier Package	SOIC N	SOIC N	PDIP N	SOIC N	SOIC N	SOIC N
Standard Package Name	SOP	SOP	DIP	SOP	SOP	SOP
Mounting	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount
Package Height	1.5(Max)	1.5(Max)	3.3	1.5(Max)	1.5(Max)	1.5(Max)
Package Length	5(Max)	5(Max)	10.16(Max)	5(Max)	5(Max)	5(Max)
Package Width	3.99(Max)	3.99(Max)	6.48	3.99(Max)	3.99(Max)	3.99(Max)
PCB changed	8	8	8	8	8	8
Lead Shape	Gull-wing	Gull-wing	Through Hole	Gull-wing	Gull-wing	Gull-wing
HTS	8542.39.00.01	8542.39.00.01	-	8542.39.00.01	8542.39.00.01	-
SVHC	Yes	Yes	Yes	Yes	Yes	-
SVHC Exceeds Threshold	Yes	Yes	Yes	Yes	Yes	-

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