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Date: 03/28/05

SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers

© Copyright 2005 Sipex Corporation

SP3070E - SP3078E Family

±15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe

RS-485/RS422 Transceivers

®

DESCRIPTION

FEATURES

■ ±15kV ESD protection for RS485 pins

■ 3.3V low-power operation

■ Advanced Receiver-failsafe protection for

open, shorted or terminated lines

■ Up to 256 Transceivers may share Bus

■ Very low load for 8x greater fanout

■ Hot Swap glitch protection RE and DE

■ Thermal shutdown protects against driver

contention

■ Available in three industry standard foot-

prints

■ SP3070E, 3073 and 3076 in Full-Duplex (14 pin)

■ SP3071E, 3074 and 3077 in Full-Duplex (8 pin)

■ SP3072E, 3075 and 3078 in Half-Duplex (8 pin)

■ Three applications-optimized speed grades

■ SP3070-72E: 250kbps slew-limited

■ SP3073-75E: 500kbps slew-limited

■ SP3076-78E: 16Mbps high speed

■ Small form factor SO-narrow packages

■ Industrial (-40 to +85ºC) and Extended

(-40 to +85ºC) temperature grades

Now Available in Lead Free Packaging

1

2

3

4

5

6

7

8

8 PIN NSOIC

SP3071E

SP3074E

SP3077E

Full Duplex

B

A

GND

Z

Y

NC

RO

RE

DE

DI

GND

14 Pin NSOIC

SP3070E

SP3073E

SP3076E

Full Duplex

NC

A

B

Z

Y

1

2

3

4

5

6

14

13

12

11

10

9

NC

GND 7

8

APPLICATIONS

■ Industrial Control, Utility Meters Building Automation, Instrumentation, Point of Sale

The SP3070-3078E differential line transceivers are suitable for bidirectional communication

on balanced multipoint bus transmission lines and comply with both RS485 and RS422 EIA

Standards. Each device consists of a differential driver and differential receiver. All devices

operate from a 3.3V power supply.

High receiver input impedance allows a large number of transceivers to share a common data

bus while maintaining signal margin and without excessive loading or use of expensive

repeaters. The high impedance driver output is maintained over the entire common-mode

voltage range from -7 to +12V. Receivers will failsafe to logic 1 output when inputs are open,

shorted or terminated. Drivers include built-in short-circuit protection and a thermal-overload

shutdown to protect against excessive power dissipation from bus contention or cable faults.

All RS485 inputs are ESD protected up to ±15kV (Air-Gap and Human Body Model) and up

to ±8kV Contact discharge (IEC 1000-4-2).

1

2

3

4

5

6

7

8

8 PIN NSOIC

SP3072E

SP3075E

SP3078E

Half Duplex

B

RO

A

GND

DE

DI

RE