MAX481E datasheet(13/16 Pages) MAXIM

Part #	MAX481E

Description	±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers

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Manufacturer	MAXIM [Maxim Integrated Products]

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13 / 16 page

±15kV ESD-Protected, Slew-Rate-Limited,

Low-Power, RS-485/RS-422 Transceivers

It takes the drivers and receivers longer to become

enabled from the low-power shutdown state (tZH(SHDN),

tZL(SHDN)) than from the operating mode (tZH, tZL). (The

parts are in operating mode if the RE, DE inputs equal a

logical 0,1 or 1,1 or 0, 0.)

Driver Output Protection

Excessive output current and power dissipation caused

by faults or by bus contention are prevented by two

mechanisms. A foldback current limit on the output stage

provides immediate protection against short circuits over

the whole common-mode voltage range (see

Typical

Operating Characteristics). In addition, a thermal shut-

down circuit forces the driver outputs into a high-imped-

ance state if the die temperature rises excessively.

Propagation Delay

Many digital encoding schemes depend on the differ-

ence between the driver and receiver propagation

delay times. Typical propagation delays are shown in

Figures 19–22 using Figure 18’s test circuit.

The difference in receiver delay times, tPLH - tPHL, is

typically under 13ns for the MAX481E, MAX485E,

MAX490E, MAX491E, and MAX1487E, and is typically

less than 100ns for the MAX483E and MAX487E–

MAX489E.

The driver skew times are typically 5ns (10ns max) for

the MAX481E, MAX485E, MAX490E, MAX491E, and

MAX1487E, and are typically 100ns (800ns max) for the

MAX483E and MAX487E–MAX489E.

Typical Applications

The MAX481E, MAX483E, MAX485E, MAX487E–

MAX491E, and MAX1487E transceivers are designed for

bidirectional data communications on multipoint bus

transmission lines. Figures 25 and 26 show typical net-

work application circuits. These parts can also be used as

line repeaters, with cable lengths longer than 4000 feet.

To minimize reflections, the line should be terminated at

both ends in its characteristic impedance, and stub

lengths off the main line should be kept as short as possi-

ble. The slew-rate-limited MAX483E and MAX487E–

MAX489E are more tolerant of imperfect termination.

Bypass the VCC pin with 0.1µF.

Isolated RS-485

For isolated RS-485 applications, see the MAX253 and

MAX1480 data sheets.

Line Length vs. Data Rate

The RS-485/RS-422 standard covers line lengths up to

4000 feet. Figures 23 and 24 show the system differen-

tial voltage for the parts driving 4000 feet of 26AWG

twisted-pair wire at 110kHz into 100

Ω loads.

100pF

R = 54

Ω

A

B

Y

D

Z

R

RECEIVER

OUT

TTL IN

tR, tF < 6ns

Figure 18. Receiver Propagation Delay Test Circuit

MAX481E/MAX483E/MAX485E/

MAX487E–MAX491E/MAX1487E

Maxim Integrated

13

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