MAX491 Maxim Integrated Products, MAX491 Datasheet

MAX491

Manufacturer Part Number

MAX491

Description

Manufacturer

Maxim Integrated Products

Datasheets

1.MAX491.pdf (16 pages)

2.MAX491.pdf (19 pages)

3.MAX491.pdf (16 pages)

Specifications of MAX491

Case

SOP-14

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The MAX481, MAX483, MAX485, MAX487–MAX491, and

MAX1487 are low-power transceivers for RS-485 and RS-

422 communication. Each part contains one driver and one

receiver. The MAX483, MAX487, MAX488, and MAX489

feature reduced slew-rate drivers that minimize EMI and

reduce reflections caused by improperly terminated cables,

thus allowing error-free data transmission up to 250kbps.

The driver slew rates of the MAX481, MAX485, MAX490,

MAX491, and MAX1487 are not limited, allowing them to

transmit up to 2.5Mbps.

These transceivers draw between 120µA and 500µA of

supply current when unloaded or fully loaded with disabled

drivers. Additionally, the MAX481, MAX483, and MAX487

have a low-current shutdown mode in which they consume

only 0.1µA. All parts operate from a single 5V supply.

Drivers are short-circuit current limited and are protected

against excessive power dissipation by thermal shutdown

circuitry that places the driver outputs into a high-imped-

ance state. The receiver input has a fail-safe feature that

guarantees a logic-high output if the input is open circuit.

The MAX487 and MAX1487 feature quarter-unit-load

receiver input impedance, allowing up to 128 MAX487/

MAX1487 transceivers on the bus. Full-duplex communi-

cations are obtained using the MAX488–MAX491, while

the MAX481, MAX483, MAX485, MAX487, and MAX1487

are designed for half-duplex applications.

________________________Applications

______________________________________________________________Selection Table

19-0122; Rev 7; 6/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX1487

NUMBER

MAX481

MAX483

MAX485

MAX487

MAX488

MAX489

MAX490

MAX491

PART

Low-Power RS-485 Transceivers

Low-Power RS-422 Transceivers

Level Translators

Transceivers for EMI-Sensitive Applications

Industrial-Control Local Area Networks

HALF/FULL

DUPLEX

Half

Full

________________________________________________________________ Maxim Integrated Products

General Description

DATA RATE

(Mbps)

0.25

2.5

SLEW-RATE

LIMITED

Yes

Low-Power, Slew-Rate-Limited

RS-485/RS-422 Transceivers

LOW-POWER

SHUTDOWN

Yes

o In µMAX Package: Smallest 8-Pin SO

o Slew-Rate Limited for Error-Free Data

o 0.1µALow-Current Shutdown Mode

o Low Quiescent Current:

o -7V to +12V Common-Mode Input Voltage Range

o Three-State Outputs

o 30ns Propagation Delays, 5ns Skew

o Full-Duplex and Half-Duplex Versions Available

o Operate from a Single 5V Supply

o Allows up to 128 Transceivers on the Bus

o Current-Limiting and Thermal Shutdown for

Ordering Information continued at end of data sheet.

*Contact factory for dice specifications.

____________________________Features

MAX481CPA

MAX481CSA

MAX481CUA

MAX481C/D

RECEIVER/

Transmission (MAX483/487/488/489)

(MAX481/483/487)

120µA (MAX483/487/488/489)

230µA (MAX1487)

300µA (MAX481/485/490/491)

(MAX481/485/490/491/1487)

(MAX487/MAX1487)

Driver Overload Protection

ENABLE

DRIVER

Yes

PART

QUIESCENT

CURRENT

( A)

300

120

300

120

300

230

TEMP RANGE

0°C to +70°C

Ordering Information

TRANSMITTERS

NUMBER OF

ON BUS

128

PIN-PACKAGE

8 Plastic DIP

8 SO

8 µMAX

Dice*

COUNT

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