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LMS1485MX Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LMS1485MX
Descripción Electrónicos  5V Low Power RS-485 Differential Bus Transceiver
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMS1485MX Datasheet(HTML) 2 Page - National Semiconductor (TI)

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Connection Diagram
8-Pin SOIC
20048802
Top View
Ordering Information
Package
Part Number
Package Marking
Transport Media
NSC Drawing
8-Pin SOIC
LMS1485M
LMS1485M
95 Units/Rail
M08A
LMS1485MX
2.5k Units Tape and Reel
LMS1485IM
LMS1485IM
95 Units/Rail
LMS1485IMX
2.5k Units Tape and Reel
Pin Descriptions
Pin # I/O
Name
Function
1
O
RO
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)
2I
RE
Receiver Output Enable: RO is enabled when RE is low; RO is in TRI-STATE when RE is high
3
I
DE
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)
4
I
DI
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
5
N/A
GND
Ground
6
I/O
A
Non-inverting Driver Output and Receiver Input pin. Driver Output levels conform to RS-485
signaling levels
7
I/O
B
Inverting Driver Output and Receiver Input pin. Driver Output levels conform to RS-485 signaling
levels
8
N/A
V
CC
Power Supply: 4.75V
≤ V
CC
≤ 5.25V
Truth Table
DRIVER SECTION
RE
DE
DI
A
B
XH
H
H
L
XH
L
L
H
XL
X
Z
Z
RECEIVER SECTION
RE
DE
A-B
RO
LL
≥ +0.2V
H
LL
≤ −0.2V
L
HX
X
Z
L
L
OPEN *
H
Note: * = Non Terminated, Open Input only
X = Irrelevant
Z = TRI-STATE
H = High level
L = Low level
www.national.com
2


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