DS36C279TM NSC [National Semiconductor], DS36C279TM Datasheet

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DS36C279TM

Manufacturer Part Number
DS36C279TM
Description
Low Power EIA-RS-485 Transceiver with Sleep Mode
Manufacturer
NSC [National Semiconductor]
Datasheet

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© 1999 National Semiconductor Corporation
DS36C279
Low Power EIA-RS-485 Transceiver with Sleep Mode
General Description
The DS36C279 is a low power differential bus/line trans-
ceiver designed to meet the requirements of RS-485 Stan-
dard for multipoint data transmission. In addition it is compat-
ible with TIA/EIA-422-B.
The sleep mode feature automatically puts the device in a
power saving mode when both the driver and receiver are
disabled.
applications where the device may be disabled for extended
periods of time.
The driver and receiver outputs feature TRI-STATE
ity. The driver outputs operate over the entire common mode
range of −7V to +12V. Bus contention or fault situations that
cause excessive power dissipation within the device are
handled by a thermal shutdown circuit, which forces the
driver outputs into a high impedance state.
The receiver incorporates a fail safe circuit which guarantees
a high output state when the inputs are left open.
The DS36C279T is fully specified over the industrial tem-
perature range (−40˚C to +85˚C).
Connection and Logic Diagram
TRI-STATE
Order Number DS36C279M, DS36C279N,
®
See NS Package Number M08A or N08E
††
is a registered trademark of National Semiconductor Corporation.
The device is ideal for use in power conscious
DS36C279TM or DS36C279TN
DS012053-1
DS012053
®
capabil-
Features
n 100% RS-485 compliant
n Low power CMOS design:
n Automatic sensing sleep mode
n Built-in power up/down glitch-free circuitry
n DIP and SOIC packages available
n Industrial temperature range: −40˚C to +85˚C
n On-board thermal shutdown circuitry
n Wide common mode range: −7V to +12V
n Receive open input fail-safe (Note 1)
n
n
n ESD (Human Body Model):
n Drop-in replacement for:
Truth Table
Note 1: Non-terminated, open input only
Note 2: Device enters sleep mode if enable conditions are held 600 ns
DRIVER SECTION
RECEIVER SECTION
1
1
— Guaranteed RS-485 device interoperation
— Reduces I
— Permits live transceiver intersection/displacement
— Prevents damage to the device in the event of
— LTC485 MAX485 DS75176 DS3695
RE*
RE*
4
2
X
X
X
H
L
L
L
excessive power dissipation
unit load (DS36C279):
unit load (DS36C279T):
DE
DE
H
H
L
L
L
L
L
CC
to 10 µA maximum
DI
OPEN (Note 1)
H
X
L
RI-RI*
+0.2V
−0.2V
X
I
128 nodes
CC
64 nodes
2 kV
DO/RI
500 µA max
H
L
Z
www.national.com
Z (Note 2)
DO*/RI*
July 1998
RO
H
H
H
Z
L
L

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DS36C279TM Summary of contents

Page 1

... The DS36C279T is fully specified over the industrial tem- perature range (−40˚C to +85˚C). Connection and Logic Diagram DS012053-1 Order Number DS36C279M, DS36C279N, DS36C279TM or DS36C279TN See NS Package Number M08A or N08E TRI-STATE ® registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation ...

Page 2

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( Input Voltage (DE, RE*, & DI) −0. Common Mode ( ...

Page 3

Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol Parameter RECEIVER CHARACTERISTICS I Short Circuit Current V OSR I TRI-STATE Leakage V OZR Current DEVICE CHARACTERISTICS V High Level Input Voltage IH V Low Level Input ...

Page 4

Switching Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol Parameter RECEIVER CHARACTERISTICS Mode to Output Low Note 3: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are ...

Page 5

Parameter Measurement Information FIGURE 6. Driver Differential Propagation Delays and Differential Rise and Fall Times FIGURE 7. TRI-STATE and Sleep Mode Test Circuit ( PZH PSH PHZ FIGURE 8. TRI-STATE and Sleep Mode Waveforms (t ...

Page 6

Parameter Measurement Information FIGURE 13. Receiver Differential Propagation Delay Waveforms FIGURE 14. Receiver TRI-STATE and Sleep Mode Test Circuit FIGURE 15. Receiver Enable and Disable Waveforms (t FIGURE 16. Receiver Enable and Disable Waveforms (t www.national.com (Continued) DS012053-13 DS012053-14 DS012053-15 ...

Page 7

Parameter Measurement Information FIGURE 17. Entering Sleep Mode Conditions Typical Application Information FIGURE 18. Typical RS-485 Bus Interface Pin Name No Receiver Output: When RE (Receiver Enable) is LOW, the receiver is enabled (ON), if DO/RI DO*/RI* by ...

Page 8

Unit Load (Continued) allow signals to be transferred to and from each individual seat to 1 main station. Usually there is one or two less seats in the last row of the aircraft near the restrooms and food storage area. ...

Page 9

... Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC Order Number DS36C279M or DS36C279TM 8-Lead (0.300" Wide) Molded Dual-In-Line Package Order Number DS36C279N or DS36C279TN NS Package Number M08A NS Package Number N08E 9 www.national.com ...

Page 10

LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION. As used herein: 1. Life support devices ...

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