DS481TM National Semiconductor, DS481TM Datasheet

DS481TM

Manufacturer Part Number

DS481TM

Description

IC, TXRX, RS485/422, W/SLEEP, 8SOIC

Manufacturer

National Semiconductor

Datasheet

1.DS481TMXNOPB.pdf (8 pages)

Specifications of DS481TM

Device Type

Line Driver / Receiver

No. Of Drivers

Supply Voltage Range

4.75V To 5.25V

Driver Case Style

SOIC

No. Of Pins

Operating Temperature Range

-40Â°C To +85Â°C

Svhc

No SVHC

Interface Type

RS422, RS485

Rohs Compliant

Yes

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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DS481

Low Power RS-485/RS-422 Multipoint Transceiver with

Sleep Mode

General Description

The DS481 is a low-power transceiver for RS-485 and RS-

422 communication. The device contains one driver and one

receiver. The drivers slew rate allows for operation up to 2.0

Mbps (see Applications Information section).

The transceiver draws 200 µA of supply current when un-

loaded or 0.2 µA when in the automatic sleep mode. Sleep

mode is activated by inactivity on the enables (DE and RE

(Note 1)). Holding DE =L and RE (Note 1)=H for greater than

600 ns will enable the sleep mode. The DS481 operates

from a single +5V supply.

The driver is short-circuit current limited and is protected

against excessive power dissipation by thermal shutdown

circuitry that places the driver outputs into TRI-STATE

(High Impedance state) under fault conditions. The driver

guarantees a minimum of 1.5V differential output voltage

with maximum loading across the common mode range

The receiver has a failsafe feature that guarantees a logic-

high output if the input is open circuit.

The DS481 is available in a surface mount package and is

characterized for Industrial temperature range operation.

Connection and Logic Diagram

*Note: Non Terminated, Open Input only

TRI-STATE

DS481TM

OD3

Order Number

is a registered trademark of National Semiconductor Corporation.

−40˚C to +85˚C

Temp. Range

01291901

DS012919

SOP/M08A

Package/###

Features

n Meets TIA/EIA RS-485 multipoint standard

n Sleep mode reduces I

n Guaranteed full load output voltage (V

n Low quiescent current:

n −7V to +12V common-mode input voltage range

n TRI-STATE outputs on driver and receiver

n AC performance:

n Half-duplex flow through pinout

n Operates from a single 5V supply

n Allows up to 64 tranceivers on the bus

n Current-limiting and thermal shutdown for driver

n Industrial temperature range operation

n Pin and functional compatible with MAX481C and

Truth Table

Note 1: Non Terminated, Open Input only

Note 2: Device enters sleep mode if enable conditions are held

DE = L and RE (Note 1) = H.

X = indeterminate

Z = TRI-STATE

DRIVER SECTION

RECEIVER SECTION

RE (Note

overload protection

MAX481E

— Driver transition time: 25 ns typ

— Driver propagation delay: 40 ns typ

— Driver skew: 1 ns typ

— Receiver propagation delay: 200 ns typ

— Receiver skew: 20 ns typ

OPEN (Note 1)

to 0.2 µA

200 µA typ

≥+0.2V

≤−0.2V

A-B

OD3

)

www.national.com

Z (Note 2)

July 2000

600 ns,

Related parts for DS481TM

DS481TM Summary of contents

Page 1

... The DS481 is available in a surface mount package and is characterized for Industrial temperature range operation. Connection and Logic Diagram *Note: Non Terminated, Open Input only Order Number Temp. Range DS481TM −40˚C to +85˚C TRI-STATE ® registered trademark of National Semiconductor Corporation. © 2004 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 ( Enable Input Voltage (RE (Note 1), DE) Driver Input Voltage (DI) Driver Output Voltage (A, B) Receiver Input Voltage (A, B) Receiver Output Voltage (RO) ...

Page 3

Switching Characteristics Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified (Notes 5, 9, 10) Symbol Parameter t Driver Differential Propagation Delay — Low to High PLHD t Driver Differential Propagation Delay — High to Low PHLD t Differential ...

Page 4

Parameter Measurement Information FIGURE FIGURE 2. V OD3 FIGURE 3. FIGURE 4. www.national.com 01291902 01291903 01291904 01291905 4 01291906 FIGURE 5. 01291907 FIGURE 6. 01291908 FIGURE 7. 01291909 FIGURE 8. 01291910 FIGURE 9. ...

Page 5

FIGURE 10. 01291912 FIGURE 11. FIGURE 12. FIGURE 13. 5 01291913 01291914 www.national.com ...

Page 6

Parameter Measurement Information *Note: Non Terminated, Open Input only FIGURE 14. Entering Sleep Mode Conditions (modes and exit parameters shown) Pin Name No. Receiver Output: When RE (Receiver Enable) is LOW, the receiver is enabled (ON), if DO/RI ≥ DO ...

Page 7

Unit Load (Continued) The advantage of the 1 ⁄ UL device is the increased number 2 of nodes on one bus single master multi-slave type of application where the number of slaves exceeds 32, the DS481 may save ...

Page 8

... Tel: 1-800-272-9959 Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 Order Number DS481TM 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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