LTC490IS8 Linear Technology, LTC490IS8 Datasheet

IC TXRX RS485 LOWPWR DIFF 8-SOIC

LTC490IS8

Manufacturer Part Number
LTC490IS8
Description
IC TXRX RS485 LOWPWR DIFF 8-SOIC
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet

Specifications of LTC490IS8

Number Of Drivers/receivers
1/1
Protocol
RS422, RS485
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC490IS8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTC490IS8
Quantity:
1 800
Part Number:
LTC490IS8#PBF
Manufacturer:
LT
Quantity:
6 500
Part Number:
LTC490IS8#PBF
Manufacturer:
LTC
Quantity:
1 067
Part Number:
LTC490IS8#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC490IS8#TRPBF
Manufacturer:
LT
Quantity:
20 000
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Low Power: I
Designed for RS485 or RS422 Applications
Single 5V Supply
– 7V to 12V Bus Common Mode Range
Permits 7V Ground Difference Between Devices
on the Bus
Thermal Shutdown Protection
Power-Up/-Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Package
Driver Maintains High Impedance with the
Power Off
Combined Impedance of a Driver Output and
Receiver Allows up to 32 Transceivers on the Bus
70mV Typical Input Hysteresis
28ns Typical Driver Propagation Delays with
5ns Skew for 2.5MB Operation
Pin Compatible with the SN75179
Available in 8-Lead PDIP and SO Packages
Low Power RS485/RS422 Transceiver
Level Translator
CC
D
R
= 300 A Typical
U
3
2
DRIVER
RECEIVER
LTC490
U
5
6
8
7
120
120
4000 FT BELDEN 9841
4000 FT BELDEN 9841
DESCRIPTIO
The LTC
ceiver designed for multipoint data transmission standard
RS485 applications with extended common mode range
(12V to –7V). It also meets the requirements of RS422.
The CMOS design offers significant power savings over its
bipolar counterpart without sacrificing ruggedness against
overload or ESD damage.
Excessive power dissipation caused by bus contention or
faults is prevented by a thermal shutdown circuit which
forces the driver outputs into a high impedance state. The
receiver has a fail safe feature which guarantees a high
output state when the inputs are left open.
Both AC and DC specifications are guaranteed from 0 C to
70 C and 4.75V to 5.25V supply voltage range.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
120
120
490 is a low power differential bus/line trans-
Differential Driver and
U
RECEIVER
LTC490
DRIVER
LTC490 • TA01
Receiver Pair
R
D
LTC490
1
490fb

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LTC490IS8 Summary of contents

Page 1

... The receiver has a fail safe feature which guarantees a high output state when the inputs are left open. Both AC and DC specifications are guaranteed from and 4.75V to 5.25V supply voltage range. , LTC and LT are registered trademarks of Linear Technology Corporation. 5 120 120 6 ...

Page 2

... O = Low V = 12V – 12V ORDER PART TOP VIEW NUMBER LTC490CN8 7 B LTC490CS8 LTC490IN8 5 Y LTC490IS8 N8 PACKAGE 8-LEAD PDIP S8 PART MARKING S8 PACKAGE 490 = 100 C/ W (N8) JA 490I = 150 C/ W (S8) JA MIN TYP MAX 5 2 1.5 5 0.2 3 0.2 2.0 0 12V – 7V – 0.8 IN – ...

Page 3

U SWITCHI G CHARACTERISTICS operating temperature range, otherwise specifications are at T SYMBOL PARAMETER t Driver Input to Output PLH t Driver Input to Output PHL t Driver Output to Output SKEW Driver Rise or Fall Time ...

Page 4

LTC490 W U TYPICAL PERFOR A CE CHARACTERISTICS TTL Input Threshold vs Temperature 1.63 1.61 1.59 1.57 1.55 – 100 TEMPERATURE ( C ) LTC490 • TPC04 Driver Differential Output Voltage vs Temperature 2.3 ...

Page 5

CTIO S V (Pin 1): Positive Supply; 4.75V (Pin 2): Receiver Output > 200mV, R will be high < 200mV, then R will be ...

Page 6

LTC490 U U APPLICATIO S I FOR ATIO Typical Application A typical connection of the LTC490 is shown in Figure 5. Two twisted-pair wires connect two driver/receiver pairs for full duplex data transmission. Note that the driver and receiver outputs ...

Page 7

U U APPLICATIO S I FOR ATIO less flexible, more bulky, and more costly than twisted pairs. Many cable manufacturers offer a broad range of 120 cables designed for RS485 applications. Losses in a transmission line are a complex combination ...

Page 8

LTC490 U U APPLICATIO S I FOR ATIO cable is lightly loaded (470 ), the signal reflects in phase and increases the amplitude at the driver output. An input frequency of 30kHz is adequate for tests out to 4000 feet ...

Page 9

U TYPICAL APPLICATIO S RS232 IN RS232 Receiver RS232 IN RX 5.6k RECEIVER 1/2 LTC490 LTC490 • TA02 RS232 to RS485 Level Transistor with Hysteresis R = 220k Y 10k 120 DRIVER 5.6k 1/2 LTC490 VY – VZ ———— HYSTERESIS ...

Page 10

LTC490 PACKAGE DESCRIPTIO .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL ...

Page 11

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... Industry-Standard Pinout, 500ps Propagation Delay Skew LTC490/LTC491 Pin Compatible Highest Speed, LTC486/LTC487 Pin Compatible 15kV ESD, LTC490 Pin Compatible 15kV ESD, Fail-Safe (LT1785A) 15kV ESD, Fail-Safe (LT1791A), LTC491 Pin Compatible www.linear.com 490fb LT/TP 0104 1K REV B • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1993 ...

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