LTC491IS#TRPBF Linear Technology, LTC491IS#TRPBF Datasheet

IC TXRX RS485 LOW POWER 14-SOIC

LTC491IS#TRPBF

Manufacturer Part Number
LTC491IS#TRPBF
Description
IC TXRX RS485 LOW POWER 14-SOIC
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet

Specifications of LTC491IS#TRPBF

Number Of Drivers/receivers
1/1
Protocol
RS422, RS485
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Surface Mount
Package / Case
14-SOIC (3.9mm Width), 14-SOL
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC491IS#TRPBFLTC491IS
Manufacturer:
LT
Quantity:
1 000
Company:
Part Number:
LTC491IS#TRPBFLTC491IS
Manufacturer:
LT/凌特
Quantity:
20 000
Company:
Part Number:
LTC491IS#TRPBFLTC491IS#PBF
Manufacturer:
LTC
Quantity:
620
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
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 in Three-State or
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 SN75180
Available in 14-Lead PDIP and SO Packages
Low Power RS485/RS422 Transceiver
Level Translator
CC
D
R
= 300 A Typical
U
5
2
DRIVER
RECEIVER
REB
LTC491
DE
4
3
U
10
12
11
9
120
120
4000 FT 24 GAUGE TWISTED PAIR
4000 FT 24 GAUGE TWISTED PAIR
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.
The driver and receiver feature three-state outputs, with
the driver outputs maintaining high impedance over the
entire common mode range. 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.
®
491 is a low power differential bus/line trans-
120
120
Differential Driver and
U
RECEIVER
LTC491
REB
DRIVER
DE
Receiver Pair
LTC491 • TA01
R
D
LTC491
1
491fa

Related parts for LTC491IS#TRPBF

LTC491IS#TRPBF 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. 9 120 120 10 ...

Page 2

LTC491 BSOLUTE (Note 1) Supply Voltage (V ) ............................................... 12V CC Control Input Voltages .................... –0. Control Input Currents .......................... –50mA to 50mA Driver Input Voltages ...................... –0. Driver ...

Page 3

U S WITCHI G C HARA TERISTICS C 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 ...

Page 4

LTC491 W U TYPICAL PERFOR A CE CHARACTERISTICS Driver Output High Voltage vs Output Current –96 –72 – 48 – OUTPUT VOLTAGE (V) LTC491 • TPC01 TTL Input Threshold ...

Page 5

TEST CIRCUITS OD2 LTC491 • F01 Figure 1. Driver DC Test Load DRIVER R RECEIVER DIFF Figure 2. Driver/Receiver Timing Test Circuit S1 1k ...

Page 6

LTC491 U W SWITCHI WAVEFOR 1. PLH V O 80% 50% 10% – 1/2 V SKEW 1. ...

Page 7

U U APPLICATIO S I FOR ATIO Typical Application A typical connection of the LTC491 is shown in Figure 9. Two twisted-pair wires connect driver/receiver pairs for full duplex data transmission. There are no restrictions on where ...

Page 8

LTC491 PPLICATI S I FOR ATIO A Cables and Data Rate The transmission line of choice for RS485 applications is a twisted pair. There are coaxial cables (twinaxial) made for this purpose that contain straight pairs, but ...

Page 9

PPLICATI S I FOR ATIO When the reflected signal returns to the driver, the ampli- tude will be lowered. The width of the pedestal is equal to twice the electrical length of the cable (about 1.5ns/foot). ...

Page 10

LTC491 PPLICATI S I FOR ATIO Fault Protection All of LTC’s RS485 products are protected against ESD transients up to 2kV using the human body model (100pF, 1.5k ). However, some applications need more protection. The ...

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

... ESD, Fail-Safe (LT1785A) 15kV ESD, Fail-Safe (LT1791A), LTC491 Pin Compatible www.linear.com R = 220k Y 10k 120 DRIVER Z 1/2 LTC491 ———— ———— HYSTERESIS = 10k • R LTC491 • TA03 LT/TP 0104 1K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1992 19k R 491fa ...

Related keywords