MAX3079E datasheet(18/24 Pages) MAXIM

Part #	MAX3079E

Description	3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers

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Manufacturer	MAXIM [Maxim Integrated Products]

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Low-Power Shutdown Mode (Except

MAX3071E/MAX3074E/MAX3077E)

Low-power shutdown mode is initiated by bringing both

RE high and DE low. In shutdown, the devices typically

draw only 50nA of supply current.

RE and DE can be driven simultaneously; the parts are

guaranteed not to enter shutdown if RE is high and DE

is low for less than 50ns. If the inputs are in this state

for at least 600ns, the parts are guaranteed to enter

shutdown.

Enable times tZH and tZL (see the Switching

Characteristics section) assume the part was not in a

low-power shutdown state. Enable times tZH(SHDN) and

tZL(SHDN) assume the parts were shut down. It takes

drivers and receivers longer to become enabled from

low-power shutdown mode (tZH(SHDN), tZL(SHDN)) than

from driver/receiver-disable mode (tZH, tZL).

Driver Output Protection

Two mechanisms prevent excessive output current and

power dissipation caused by faults or by bus contention.

The first, a foldback current limit on the output stage,

provides immediate protection against short circuits over

the whole common-mode voltage range (see the

Typical

Operating Characteristics). The second, a thermal-shut-

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

ance state if the die temperature becomes excessive.

Line Length

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

4000ft. For line lengths greater than 4000ft, use the

repeater application shown in Figure 11.

Typical Applications

The MAX3072E/MAX3075E/MAX3078E/MAX3079E

transceivers are designed for bidirectional data commu-

nications on multipoint bus transmission lines. Figures

12 and 13 show typical network applications circuits.

To minimize reflections, terminate the line at both ends

in its characteristic impedance, and keep stub lengths

off the main line as short as possible. The slew-rate-lim-

ited MAX3072E/MAX3075E and the two modes of the

MAX3079E are more tolerant of imperfect termination.

Chip Information

TRANSISTOR COUNT: 1228

PROCESS: BiCMOS

+3.3V, ±15kV ESD-Protected, Fail-Safe,

Hot-Swap, RS-485/RS-422 Transceivers

RO

DI

DE

R

D

MAX3070E/MAX3071E/MAX3073E/

MAX3074E/MAX3076E/MAX3077E/

MAX3079E (FULL-DUPLEX)

RE

120

Ω

120

Ω

A

B

Z

Y

DATA IN

DATA OUT

Figure 11. Line Repeater for MAX3070E/MAX3071E/MAX3073E/

MAX3074E/MAX3076E/MAX3077E/MAX3079E in Full-Duplex

Mode

DI

RO

DE

A

B

RE

RO

DI

DE

D

R

BB

B

A

120

Ω

120

Ω

D

R

MAX3072E

MAX3075E

MAX3078E

MAX3079E (HALF-DUPLEX)

RE

Figure 12. Typical Half-Duplex RS-485 Network

MAX3070E–MAX3079E

18

Maxim Integrated

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MAX3079E Datasheet(PDF) 18 Page - Maxim Integrated Products

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