DS36C280TM National Semiconductor, DS36C280TM Datasheet

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DS36C280TM

Manufacturer Part Number
DS36C280TM
Description
BUS TRANSCEIVER RS485, SMD, 36C280
Manufacturer
National Semiconductor
Datasheet

Specifications of DS36C280TM

Supply Voltage Range
4.75V To 5.25V
Digital Ic Case Style
SOIC
No. Of Pins
8
Operating Temperature Range
-40°C To +85°C
Svhc
No SVHC (15-Dec-2010)
Operating Temperature Max
85°C
Operating
RoHS Compliant
Base Number
36
Ic Generic Number
36C280
Rohs Compliant
Yes

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Part Number
Manufacturer
Quantity
Price
Part Number:
DS36C280TM
Manufacturer:
NS/国半
Quantity:
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Manufacturer:
NSC
Quantity:
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Part Number:
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Manufacturer:
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© 2004 National Semiconductor Corporation
DS36C280
Slew Rate Controlled CMOS EIA-RS-485 Transceiver
General Description
The DS36C280 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 com-
patible with TIA/EIA-422-B.
The slew rate control feature allows the user to set the driver
rise and fall times by using an external resistor. Controlled
edge rates can reduce switching EMI.
The CMOS design offers significant power savings over its
bipolar and ALS counterparts without sacrificing ruggedness
against ESD damage. The device is ideal for use in battery
powered or power conscious applications. I
500 µA maximum.
The driver and receiver outputs feature TRI-STATE
bility. The driver outputs operate over the entire common
mode range of −7V to +12V. Bus contention or fault situa-
tions are handled by a thermal shutdown circuit, which
forces the driver outputs into the high impedance state.
The receiver incorporates a fail safe circuit which guarantees
a high output state when the inputs are left open (Note 1) .
Connection and Logic Diagram
TRI-STATE
Order Number DS36C280M, DS36C280TM
®
is a registered trademark of National Semiconductor Corporation.
See NS Package Number M08A
DS012052
CC
is specified at
01205201
®
capa-
Features
n 100% RS-485 compliant
n Low power CMOS design:
n Adjustable slew rate control
n Built-in power up/down glitch-free circuitry
n SOIC packages
n Industrial temperature range: −40˚C to +85˚C
n On-board thermal shutdown circuitry
n Wide common mode range: −7V to +12V
n Receiver open input fail-safe (Note 1)
n
n
n ESD (human body model): ≥2 kV
Truth Table
Note 1: Non-terminated, Open Inputs only
DRIVER SECTION
RECEIVER SECTION
— Guaranteed RS-485 device interoperation
— Minimizes EMI affects
— Permits live transceiver insertion/displacement
— Prevents damage to the device in the event of
1
1
4
2
DE/RE*
DE/RE*
unit load (DS36C280): ≥128 nodes
unit load (DS36C280T): ≥64 nodes
excessive power dissipation
H
H
H
L
L
L
L
DI
H
X
L
OPEN (Note 1)
≥+0.2V
≤−0.2V
RI-RI*
X
I
DO/RI
CC
H
Z
L
500 µA max
www.national.com
DO*/RI*
RO
July 2000
H
H
H
L
Z
L
Z

Related parts for DS36C280TM

DS36C280TM Summary of contents

Page 1

... The receiver incorporates a fail safe circuit which guarantees a high output state when the inputs are left open (Note 1) . Connection and Logic Diagram Order Number DS36C280M, DS36C280TM See NS Package Number M08A TRI-STATE ® ...

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) Common Mode ( Driver Output/Receiver Input Input Voltage (DO/RI, DO*/RI*) Receiver Output Voltage Maximum Package Power Dissipation ...

Page 3

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

Page 4

Switching Characteristics Note 3: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except OD2 Note 4: All typicals are given for: V ...

Page 5

Parameter Measurement Information (Continued) FIGURE 7. TRI-STATE Test Circuit (t FIGURE 8. TRI-STATE Waveforms (t FIGURE 9. TRI-STATE Test Circuit (t FIGURE 13. Receiver Differential Propagation Delay Waveforms FIGURE 10. TRI-STATE Waveforms (t 01205207 , t ) PZH PHZ FIGURE ...

Page 6

Parameter Measurement Information FIGURE 15. Receiver Enable and Disable Waveforms (t FIGURE 16. Receiver Enable and Disable Waveforms (t www.national.com (Continued) FIGURE 14. Receiver TRI-STATE Test Circuit 6 01205214 01205215 , t ) PLZ PZL 01205216 , t ) PHZ ...

Page 7

Typical Application Information Pin Name # Receiver Output: When DE/RE* (Receiver Enable) is LOW, the receiver is enabled (ON), if DO/RI ≥ DO*/RI* by 200 mV, RO will be HIGH. If DO/RI ≤ DO*/RI* by 200 mV, RO ...

Page 8

Unit Load (Continued) FIGURE 18. Input Current vs Input Voltage Operating Range Slew Rate Control The DS36C280 features an adjustable slew rate control. This feature allows more control over EMl levels than tradi- www.national.com tion fixed edge rate devices. The ...

Page 9

... Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 Order Number DS36C280M or DS36C280TM NS Package Number M08A 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

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