ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E

Rev. A | Page 17 of 20

LOW POWER SHUTDOWN MODE

(ALL EXCEPT ADM3071E/ADM3074E/ADM3077E)

Low power shutdown mode is initiated by bringing both RE

high and DE low. In shutdown mode, the device draws less than

1 μA of supply current. RE and DE can be driven simulta-

neously, but the parts are guaranteed not to enter shutdown if

RE is high and DE is low for fewer than 50 ns. If the inputs are

in this state for 600 ns or more, the parts are guaranteed to enter

originally in a low power shutdown state (see the Test Circuits

drivers and receivers longer to become enabled from low power

DRIVER OUTPUT PROTECTION

The ADM307xE family features two methods to prevent

excessive output current and power dissipation caused by faults

or by bus contention. Current limit protection on the output

stage provides immediate protection against short circuits over

the whole common-mode voltage range (see Figure 12 and

Figure 13). In addition, a thermal shutdown circuit forces the

driver outputs into a high impedance state if the die temper-

ature rises excessively.

TYPICAL APPLICATIONS

The ADM3072E/ADM3075E/ADM3078E transceivers are

designed for bidirectional data communications on multipoint

bus transmission lines. Figure 34 shows a typical network

applications circuit. The ADM3071E/ADM3074E/ADM3077E

transceivers are designed for point-to-point transmission lines

(see Figure 35). The ADM3070E/ADM3073E/ADM3076E

transceivers are designed for full-duplex RS-485 networks (see

Figure 36).

To minimize reflections, terminate the line at both ends

with a termination resistor (the value of the termination

resistor should be equal to the characteristic impedance of

the cable used) and keep stub lengths off the main line as

short as possible.

B

A

R

D

RO

DI

DE

ADM3072E/

ADM3075E/

ADM3078E

ADM3072E/

ADM3075E/

ADM3078E

ADM3072E/

ADM3075E/

ADM3078E

ADM3072E/

ADM3075E/

ADM3078E

B

A

R

D

RO

DI

DE

B

A

R

D

RO RE

DI

DE

B

A

R

D

RO

RE

DI

DE

NOTES

1. MAXIMUM NUMBER OF NODES: 256.

RE

RE

Figure 34. ADM3072E/ADM3075E/ADM3078E Typical Half-Duplex RS-485 Network

B

A

R

D

RO

DI

RO

DI

Y

Z

B

A

Y

Z

MASTER

R

D

SLAVE

ADM3071E/

ADM3074E/

ADM3077E

ADM3071E/

ADM3074E/

ADM3077E

Figure 35. ADM3071E/ADM3074E/ADM3077E Full-Duplex Point-to-Point Applications