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LT1785CS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LT1785/LT1785A/
LT1791/LT1791A
1
178591fd
For more information www.linear.com/LT1785
Typical applicaTion
DescripTion
60V Fault Protected
RS485/RS422 Transceivers
The LT
®
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.
Normal Operation Waveforms at 250kBaud
FeaTures
applicaTions
n
Protected from Overvoltage Line Faults to ±60V
n
Pin Compatible with LTC485 and LTC491
n
High Input Impedance Supports Up to 128 Nodes
n
No Damage or Latchup to ESD
n
IEC-1000-4-2 Level 4: ±15kV Air Discharge
n
IEC-1000-4-2 Level 2: ±4kV Contact Discharge
n
Controlled Slew Rates for EMI Emissions Control
n
Guaranteed High Receiver Output State for Floating,
Shorted or Inactive Inputs (LT1785A/LT1791A)
n
Outputs Assume a High Impedance When Off or
Powered Down
n
Drives Low Cost, Low Impedance Cables
n
Short-Circuit Protection on All Outputs
n
Thermal Shutdown Protection
n
Guaranteed Operation to 125°C
n
Industrial Control Data Networks
n
CAN Bus Applications
n
HVAC Controls
GND1
GND2
R
TERM
178591 TA01
RO1
RE1
DE1
DI1
LT1785
RO2
RE2
DE2
DI2
LT1785
V
CC1
V
CC2
R
TERM
TX
TX
RX
RX
RO
178591 TA02
DI
Y-Z
L, 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.
LT1785/LT1785A/
LT1791/LT1791A
2
178591fd
For more information www.linear.com/LT1785
absoluTe MaxiMuM raTings
(Note 1)
1
2
3
4
8
7
6
5
TOP VIEW
V
CC
B
A
GND
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
R
D
RO
RE
DE
DI
T
JMAX
= 150°C, θ
JA
= 130°C/W (N8)
T
JMAX
= 150°C, θ
JA
= 150°C/W (S8)
TOP VIEW
N PACKAGE
14-LEAD PDIP
S PACKAGE
14-LEAD PLASTIC SO
1
2
3
4
5
6
7
14
13
12
11
10
9
8
NC
RO
RE
DE
DI
GND
GND
V
CC
NC
A
B
Z
Y
NC
R
D
T
JMAX
= 150°C, θ
JA
= 130°C/W (N)
T
JMAX
= 150°C, θ
JA
= 150°C/W (S)
pin conFiguraTion
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1785CN8#PBF LT1785CN8#TRPBF 1785 8-Lead PDIP 0°C to 70°C
LT1785CS8#PBF LT1785CS8#TRPBF 1785 8-Lead Plastic SO 0°C to 70°C
LT1785IN8#PBF LT1785IN8#TRPBF 1785I 8-Lead PDIP –40°C to 85°C
LT1785IS8#PBF LT1785IS8#TRPBF 1785I 8-Lead Plastic SO –40°C to 85°C
LT1785ACN8#PBF LT1785ACN8#TRPBF 1785A 8-Lead PDIP 0°C to 70°C
LT1785ACS8#PBF LT1785ACS8#TRPBF 1785A 8-Lead Plastic SO 0°C to 70°C
LT1785AIN8#PBF LT1785AIN8#TRPBF 1785AI 8-Lead PDIP –40°C to 85°C
LT1785AIS8#PBF LT1785AIS8#TRPBF 1785AI 8-Lead Plastic SO –40°C to 85°C
LT1785HN8#PBF LT1785HN8#TRPBF 1785H 8-Lead PDIP –40°C to 125°C
LT1785HS8#PBF LT1785HS8#TRPBF 1785H 8-Lead Plastic SO –40°C to 125°C
LT1785AHN8#PBF LT1785AHN8#TRPBF 1785AH 8-Lead PDIP –40°C to 125°C
LT1785AHS8#PBF LT1785AHS8#TRPBF 1785AH 8-Lead Plastic SO –40°C to 125°C
LT1791CN#PBF LT1791CN#TRPBF 1791 14-Lead PDIP 0°C to 70°C
LT1791CS#PBF LT1791CS#TRPBF 1791 14-Lead Plastic SO 0°C to 70°C
Supply Voltage (V
CC
) ................................................18V
Receiver Enable Input Voltage ...................... –0.3V to 6V
Driver Enable Input Voltage .......................... –0.3V to 6V
Driver Input Voltage ................................... –0.3V to 18V
Receiver Input Voltage ................................ –60V to 60V
Driver Output Voltage .................................. –60V to 60V
Receiver Output Voltage ...................–0.3V to (V
CC
+ 6V)
Operating Temperature Range
LT1785C/LT1791C/
LT1785AC/LT1791AC .................................... 0°C to 70°C
LT1785I/LT1791I/
LT1785AI/LT1791AI .................................. –40°C to 85°C
LT1785H/LT1791H/
LT1785AH/LT1791AH .............................–40°C to 125°C
Storage Temperature Range ...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
LT1785/LT1785A/
LT1791/LT1791A
3
178591fd
For more information www.linear.com/LT1785
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1791IN#PBF LT1791IN#TRPBF 1791I 14-Lead PDIP –40°C to 85°C
LT1791IS#PBF LT1791IS#TRPBF 1791I 14-Lead Plastic SO –40°C to 85°C
LT1791ACN#PBF LT1791ACN#TRPBF 1791A 14-Lead PDIP 0°C to 70°C
LT1791ACS#PBF LT1791ACS#TRPBF 1791A 14-Lead Plastic SO 0°C to 70°C
LT1791AIN#PBF LT1791AIN#TRPBF 1791AI 14-Lead PDIP –40°C to 85°C
LT1791AIS#PBF LT1791AIS#TRPBF 1791AI 14-Lead Plastic SO –40°C to 85°C
LT1791HN#PBF LT1791HN#TRPBF 1791H 14-Lead PDIP –40°C to 125°C
LT1791HS#PBF LT1791HS#TRPBF 1791H 14-Lead Plastic SO –40°C to 125°C
LT1791AHN#PBF LT1791AHN#TRPBF 1791AH 14-Lead PDIP –40°C to 125°C
LT1791AHS#PBF LT1791AHS#TRPBF 1791AH 14-Lead Plastic SO –40°C to 125°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1785CN8 LT1785CN8#TR 1785 8-Lead PDIP 0°C to 70°C
LT1785CS8 LT1785CS8#TR 1785 8-Lead Plastic SO 0°C to 70°C
LT1785IN8 LT1785IN8#TR 1785I 8-Lead PDIP –40°C to 85°C
LT1785IS8 LT1785IS8#TR 1785I 8-Lead Plastic SO –40°C to 85°C
LT1785ACN8 LT1785ACN8#TR 1785A 8-Lead PDIP 0°C to 70°C
LT1785ACS8 LT1785ACS8#TR 1785A 8-Lead Plastic SO 0°C to 70°C
LT1785AIN8 LT1785AIN8#TR 1785AI 8-Lead PDIP –40°C to 85°C
LT1785AIS8 LT1785AIS8#TR 1785AI 8-Lead Plastic SO –40°C to 85°C
LT1785HN8 LT1785HN8#TR 1785H 8-Lead PDIP –40°C to 125°C
LT1785HS8 LT1785HS8#TR 1785H 8-Lead Plastic SO –40°C to 125°C
LT1785AHN8 LT1785AHN8#TR 1785AH 8-Lead PDIP –40°C to 125°C
LT1785AHS8 LT1785AHS8#TR 1785AH 8-Lead Plastic SO –40°C to 125°C
LT1791CN LT1791CN#TR 1791 14-Lead PDIP 0°C to 70°C
LT1791CS LT1791CS#TR 1791 14-Lead Plastic SO 0°C to 70°C
LT1791IN LT1791IN#TR 1791I 14-Lead PDIP –40°C to 85°C
LT1791IS LT1791IS#TR 1791I 14-Lead Plastic SO –40°C to 85°C
LT1791ACN LT1791ACN#TR 1791A 14-Lead PDIP 0°C to 70°C
LT1791ACS LT1791ACS#TR 1791A 14-Lead Plastic SO 0°C to 70°C
LT1791AIN LT1791AIN#TR 1791AI 14-Lead PDIP –40°C to 85°C
LT1791AIS LT1791AIS#TR 1791AI 14-Lead Plastic SO –40°C to 85°C
LT1791HN LT1791HN#TR 1791H 14-Lead PDIP –40°C to 125°C
LT1791HS LT1791HS#TR 1791H 14-Lead Plastic SO –40°C to 125°C
LT1791AHN LT1791AHN#TR 1791AH 14-Lead PDIP –40°C to 125°C
LT1791AHS LT1791AHS#TR 1791AH 14-Lead Plastic SO –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to: http://www.linear.com/packaging/
orDer inForMaTion
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LT1785CS8#PBF

Mfr. #:
Buy LT1785CS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-422/RS-485 Interface IC 60V Protected 15kV ESD RS485 Xver
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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