SP3070E - SP3078E Family
±15kV ESD-Protected, 3.3V, 1/8 load, Failsafe
RS-485/RS422 Transceivers
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 footprints
■ 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)
RO
RE
DE
DI
1
2
3
4
8 PIN NSOIC
SP3072E
SP3075E
SP3078E
Half Duplex
8 PIN NSOIC
SP3071E
SP3074E
SP3077E
Full Duplex
8
7
6
5
Vcc
B
A
GND
Vcc
RO
DI
GND
1
2
3
4
8
7
6
5
A
B
Z
Y
NC
RO
RE
DE
DI
GND
GND
1
2
3
4
5
6
7
14 Vcc
■ Three applications-optimized speed grades
■ SP3070E-72E: 250kbps slew-limited
■ SP3073E-75E: 500kbps slew-limited
■ SP3076E-78E: 16Mbps high speed
14 PIN NSOIC
SP3070E
SP3073E
SP3076E
Full Duplex
13 NC
12
11
10
9
8
A
B
Z
Y
NC
■ Small form factor SO-narrow packages
■ Industrial (-40 to +85ºC) and Extended
(-40 to +125ºC) temperature grades
Now Available in Lead Free Packaging
aPPlICaTIONS
■ Industrial Control, Utility Meters Building Automation, Instrumentation, Point of Sale
DESCRIPTION
The SP3070E-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 receiver inputs and driver outputs are ESD protected up to ±15kV (Air-Gap and
Human Body Model) and up to ±8kV Contact discharge (IEC 1000-4-2).
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3070E-SP3078E_100_061109
1
EXAR [ EXAR CORPORATION ]
