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Datasheet> All Categories > Analog mixed-signal IC> Drivers and interfaces> LMS485IM
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LMS485IM

Description
LINE TRANSCEIVER, PDSO8, SOIC-8
CategoryAnalog mixed-signal IC    Drivers and interfaces   
File Size1MB，15 Pages
ManufacturerRochester Electronics
Websitehttps://www.rocelec.com/
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LMS485IM Overview

LINE TRANSCEIVER, PDSO8, SOIC-8

LMS485IM Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerRochester Electronics
Parts packaging codeSOIC
package instructionSOIC-8
Contacts8
Reach Compliance Codeunknown
Differential outputYES
Number of drives1
Input propertiesDIFFERENTIAL SCHMITT TRIGGER
Interface integrated circuit typeLINE TRANSCEIVER
Interface standardsEIA-422-B; TIA-422-B; EIA-485-A; TIA-485-A; V.11; X.27
JESD-30 codeR-PDSO-G8
JESD-609 codee0
length4.902 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)235
Maximum receive delay200 ns
Number of receiver bits1
Maximum seat height1.753 mm
Maximum supply voltage5.25 V
Minimum supply voltage4.75 V
Nominal supply voltage5 V
surface mountYES
technologyBICMOS
Temperature levelINDUSTRIAL
Terminal surfaceTIN LEAD
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
maximum transmission delay60 ns
width3.899 mm

LMS485IM Preview

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LMS485 5V Low Power RS-485 / RS-422 Differential Bus Transceiver
OBSOLETE
LMS485
October 12, 2011
5V Low Power RS-485 / RS-422 Differential Bus Transceiver
General Description
The LMS485 is a low power differential bus/line transceiver
designed for high speed bidirectional data communication on
multipoint bus transmission lines. It is designed for balanced
transmission lines. It meets ANSI Standards TIA/EIA RS422-
B, TIA/EIA RS485-A and ITU recommendation and V.11 and
X.27. The LMS485 combines a TRI-STATE
®
differential line
driver and differential input receiver, both of which operate
from a single 5.0V power supply. The driver and receiver have
an active high and active low, respectively, that can be exter-
nally connected to function as a direction control. The driver
and receiver differential inputs are internally connected to
form differential input/output (I/O) bus ports that are designed
to offer minimum loading to bus whenever the driver is dis-
abled or when V
CC
= 0V. These ports feature wide positive
and negative common mode voltage ranges, making the de-
vice suitable for multipoint applications in noisy environments.
The LMS485 is available in a 8-Pin SOIC and 8-Pin DIP pack-
ages. It is a drop-in socket replacement to Maxim’s MAX485
Features
■
■
■
■
■
■
■
■
■
■
■
Meet ANSI standard RS-485-A and RS-422-B
Data rate 2.5 Mbps
Single supply voltage operation, 5V
Thermal shutdown protection
Short circuit protection
Low power BiCMOS
Allows up to 32 transceivers on the bus
Open circuit fail-safe for receiver
Extended operating temperature range −40°C to 85°C
Drop-in replacement to MAX485
Available in 8-pin SOIC and 8-Pin DIP package
Applications
■
■
■
■
■
■
■
■
Low power RS-485 systems
Network hubs, bridges, and routers
Point of sales equipment (ATM, barcode scanners,…)
Local area networks (LAN)
Integrated service digital network (ISDN)
Industrial programmable logic controllers
High speed parallel and serial applications
Multipoint applications with noisy environment
Typical Application
20062601
A Typical multipoint application is shown in the above figure. Terminating resistors, RT, are typically required but only located at the two ends of the cable.
Pull up and pull down resistors maybe required at the end of the bus to provide failsafe biasing. The biasing resistors provide a bias to the cable when all
drivers are in TRI-STATE, See National Application Note, AN-847 for further information.
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
© 2011 National Semiconductor Corporation
200626
Print Date/Time: 2011/10/12 10:59:46
www.national.com
200626 Version 3 Revision 1
LMS485
Connection Diagram
8-Pin SOIC / DIP
20062602
Top View
Truth Table
DRIVER SECTION
RE
X
X
X
RECEIVER SECTION
RE
L
L
H
L
Note: * = Non Terminated, Open Input only
X = Irrelevant
Z = TRI-STATE
H = High level
L = Low level
DE
H
H
L
DE
L
L
X
L
DI
H
L
X
A-B
A
H
L
Z
B
L
H
Z
RO
H
L
Z
H
≥
+0.2V
≤
−0.2V
X
OPEN *
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
I/O
O
I
I
I
N/A
I/O
I/O
N/A
Name
RO
RE
DE
DI
GND
A
B
V
CC
Function
Receiver Output: If A > B by 200 mV, RO will be high; If A < B by 200mV, RO will be low. RO will be
high also if the inputs (A and B) are open (non-terminated)
Receiver Output Enable: RO is enabled when RE is low; RO is in TRI-STATE when RE is high
Driver Output Enable: The driver outputs (A and B) are enabled when DE is high; they are in TRI-
STATE when DE is low. Pins A and B also function as the receiver input pins (see below)
Driver Input: A low on DI forces A low and B high while a high on DI forces A high and B low when
the driver is enabled
Ground
Non-inverting Driver Output and Receiver Input pin. Driver Output levels conform to RS-485 signaling
levels
Inverting Driver Output and Receiver Input pin. Driver Output levels conform to RS-485 signaling
levels
Power Supply: 4.75V
≤
V
CC
≤
5.25V
www.national.com
200626 Version 3 Revision 1
2
Print Date/Time: 2011/10/12 10:59:46
LMS485
Ordering Information
Package
Part Number
LMS485CM
8-Pin SOIC
LMS485CMX
LMS485IM
LMS485IMX
8-Pin DIP
LMS485CNA
LMS485INA
Package Marking
LMS485CM
LMS485IM
LMS485CNA
LMS485INA
Transport Media
95 Units/Rail
2.5k Units Tape and Reel
95 Units/Rail
2.5k Units Tape and Reel
40 Units/Rail
40 Units/Rail
N08E
M08A
NSC Drawing
3
200626 Version 3 Revision 1
Print Date/Time: 2011/10/12 10:59:46
www.national.com
LMS485
Absolute Maximum Ratings
(Note
1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage, V
CC
(Note
2)
Input Voltage, V
IN
(DI, DE, or RE)
Voltage Range at Any Bus Terminal
(AB)
Receiver Outputs
Package Thermal Impedance,
θ
JA
SOIC
DIP
Junction Temperature (Note
3)
Operating Free-Air Temperature
Range, T
A
Commercial
Industrial
Storage Temperature Range
Soldering Information
Infrared or Convection (20 sec.)
Lead Temperature (4 sec.)
ESD Rating (Note
4)
7V
−0.3V to V
CC
+ 0.3V
−7V to 12V
−0.3V to V
CC
+ 0.3V
125°C/W
88°C/W
150°C
Operating Ratings
Supply Voltage, V
CC
Voltage at any Bus Terminal
(Separately or Common Mode)
V
IN
or V
IC
High-Level Input Voltage, V
IH
(Note
5)
Low-Level Input Voltage, V
IL
(Note
5)
Differential Input Voltage, V
ID
(Note
6)
High-Level Output
Driver, I
OH
Receiver, I
OH
Low-Level Output
Driver, I
OL
Receiver, I
OL
Min Nom Max
4.75 5.0 5.25
−7
12
V
V
2
0.8
±12
V
V
V
0°C to 70°C
−40°C to 85°C
−65°C to 150°C
235°C
260°C
7kV
−15
0
−42
80
26
mA
mA
mA
mA
Electrical Characteristics
Over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
Symbol
Driver Section
| V
OD1
|
| V
OD2
|
ΔV
OD
Differential Output Voltage
Differential Output Voltage
R =
∞
(Figure
1)
R = 50Ω
(Figure
1)
,RS-422
R = 27Ω
(Figure
1)
,RS-485
Change in Magnitude of Driver R = 27Ω or 50Ω
Differential Output Voltage for (Figure
1
), (Note
7)
Complementary Output States
Common-Mode Output Voltage R = 27Ω or 50Ω
(Figure
1)
Change in Magnitude of Driver R = 27Ω or 50Ω
Common-Mode Output Voltage (Figure
1),
(Note
7)
for Complementary Output
States
CMOS Inout Logic Threshold
High
CMOS Input Logic Threshold
Low
Logic Input Current
Input Current (A, B)
DE, DI, RE
DE, DI, RE
DE, DI, RE
DE = 0V, V
CC
= 0V or 5.25V
V
IN
= 12V
V
IN
= − 7V
V
TH
ΔV
TH
V
OH
V
OL
Differential Input Threshold
Voltage
Input Hysteresis Voltage
(V
TH+
− V
TH−
)
CMOS High-level Output
Voltage
CMOS Low-level
−7V
≤
V
CM
≤
+ 12V
V
CM
= 0
I
OH
= −4mA, V
ID
= 200mV
I
OL
= 4mA, V
ID
= −200mV
4
200626 Version 3 Revision 1
Print Date/Time: 2011/10/12 10:59:46
Parameter
Conditions
Min
Typ
Max
5.25
Units
V
V
2.0
1.5
5.0
0.2
V
V
OC
ΔV
OC
3.0
0.2
V
V
V
IH
V
IL
I
IN1
I
IN2
2.0
0.8
±2
1.0
−0.8
−0.2
95
3.5
0.40
+0.2
V
V
μA
mA
Receiver Section
V
mV
V
V
www.national.com
More (Only the first 5 pages are displayed. Please Download Datasheet to view the full content.) >

LMS485IM Related Products

LMS485IM LMS485IMX LMS485CNA LMS485INA
Description LINE TRANSCEIVER, PDSO8, SOIC-8 LINE TRANSCEIVER, PDSO8, SOIC-8 LINE TRANSCEIVER, DIP8, DIP-8 LINE TRANSCEIVER, DIP8, DIP-8
Is it Rohs certified? incompatible incompatible incompatible incompatible
Maker Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics
Parts packaging code SOIC SOIC DIP DIP
package instruction SOIC-8 SOIC-8 DIP-8 DIP-8
Contacts 8 8 8 8
Reach Compliance Code unknown unknown unknown unknow
Differential output YES YES YES YES
Number of drives 1 1 1 1
Input properties DIFFERENTIAL SCHMITT TRIGGER DIFFERENTIAL SCHMITT TRIGGER DIFFERENTIAL SCHMITT TRIGGER DIFFERENTIAL SCHMITT TRIGGER
Interface integrated circuit type LINE TRANSCEIVER LINE TRANSCEIVER LINE TRANSCEIVER LINE TRANSCEIVER
Interface standards EIA-422-B; TIA-422-B; EIA-485-A; TIA-485-A; V.11; X.27 EIA-422-B; TIA-422-B; EIA-485-A; TIA-485-A; V.11; X.27 EIA-422-B; TIA-422-B; EIA-485-A; TIA-485-A; V.11; X.27 EIA-422-B; TIA-422-B; EIA-485-A; TIA-485-A; V.11; X.27
JESD-30 code R-PDSO-G8 R-PDSO-G8 R-XDIP-T8 R-XDIP-T8
JESD-609 code e0 e0 e0 e0
length 4.902 mm 4.902 mm 9.817 mm 9.817 mm
Humidity sensitivity level 1 1 1 1
Number of functions 1 1 1 1
Number of terminals 8 8 8 8
Maximum operating temperature 85 °C 85 °C 70 °C 85 °C
Minimum operating temperature -40 °C -40 °C - -40 °C
Package body material PLASTIC/EPOXY PLASTIC/EPOXY UNSPECIFIED UNSPECIFIED
encapsulated code SOP SOP DIP DIP
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE SMALL OUTLINE IN-LINE IN-LINE
Peak Reflow Temperature (Celsius) 235 235 260 260
Maximum receive delay 200 ns 200 ns 200 ns 200 ns
Number of receiver bits 1 1 1 1
Maximum seat height 1.753 mm 1.753 mm 5.08 mm 5.08 mm
Maximum supply voltage 5.25 V 5.25 V 5.25 V 5.25 V
Minimum supply voltage 4.75 V 4.75 V 4.75 V 4.75 V
Nominal supply voltage 5 V 5 V 5 V 5 V
surface mount YES YES NO NO
technology BICMOS BICMOS BICMOS BICMOS
Temperature level INDUSTRIAL INDUSTRIAL COMMERCIAL INDUSTRIAL
Terminal surface TIN LEAD TIN LEAD TIN LEAD TIN LEAD
Terminal form GULL WING GULL WING THROUGH-HOLE THROUGH-HOLE
Terminal pitch 1.27 mm 1.27 mm 2.54 mm 2.54 mm
Terminal location DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature 30 30 40 40
maximum transmission delay 60 ns 60 ns 60 ns 60 ns
width 3.899 mm 3.899 mm 7.62 mm 7.62 mm

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