+5V, Fail-Safe, 40Mbps, Profibus RS-485/

RS-422 Transceivers

6

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

DRIVER AND RECEIVER

PROPAGATION DELAYS

MAX3465 toc13

10ns/div

5V/div

5V/div

2V/div

Y, Z

DI

RO

Ω

DATA RATE = 20Mbps

ENABLE RESPONSE TIME

MAX3465 toc14

20ns/div

5V/div

1V/div

Y, Z

DE

Ω

EYE DIAGRAM

MAX3465 toc15

10ns/div

1V/div

Y, Z

Ω

DATA RATE = 20Mbps

Pin Description

PIN

FULL DUPLEX

HALF

DUPLEX

NAME

FUNCTION

MAX3465/

MAX3466

MAX3467

MAX3468/

MAX3469

SHDN

Shutdown. Drive SHDN high to enter low-power shutdown mode.

1

——

RO

Receiver Output. When RE is low and (A - B)

≥ -50mV, RO is high; if (A - B) ≤

-200mV, RO is low.

22

1

RE

Receiver Output Enable. Drive RE low to enable RO; RO is high impedance

when RE is high. Drive RE high and DE low to enter low-power shutdown mode.

3

—

2DE

Driver Output Enable. Drive DE high to enable driver output. The driver

outputs are high impedance when DE is low. Drive RE high and DE low to

enter low-power shutdown mode.

4

—

3DI

Driver Input. With DE high, a low on DI forces the noninverting output low and

the inverting output high. Similarly, a high on DI forces the noninverting output

high and the inverting output low.

5

3

4

GND

Ground

6, 7

4

5

TXP

Transmitter Phase. Connect TXP to GND, or leave unconnected for normal

phase/polarity. TXP has an internal 15µA pulldown.

8

——

Y

Noninverting Driver Output

95

—

Z

Inverting Driver Output

10

6

—

B

Inverting Receiver Input

11

7

—

A

Noninverting Receiver Input

12

8

—

RXP

Receiver Phase. Connect RXP to GND, or leave unconnected for normal

phase/polarity. RXP has an internal 15µA pulldown.

13

——

Positive Supply: +4.75V

capacitor.

14

1

8

B

Inverting Receiver Input and Inverting Driver Output

——

7

A

Noninverting Receiver Input and Noninverting Driver Output

——

6