Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3070E-SP3078E_02_2020
2
1
3
4
5
6
7
8
9
10
11
12
13
14
14 PIN NSOIC
Full Duplex
SP3070E
SP3073E
SP3076E
2
1
3
4
5
6
7
8
8 PIN NSOIC
Full Duplex
SP3071E
SP3074E
SP3077E
2
1
3
4
5
6
7
8
8 PIN NSOIC
Half Duplex
SP3072E
SP3075E
SP3078E
RO
RE
DE
DI
GND
A
B
Vcc
RO
DI
GND
A
B
Z
Y
DI
NC
RO
RE
DE
GND
NC
Y
Z
B
A
NC
Vcc
DESCRIPTION
FEaTuRES
■ ±5kV 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 (4 pin)
■ SP307E, 3074 and 3077 in Full-Duplex (8 pin)
■ SP3072E, 3075 and 3078 in Half-Duplex (8 pin)
■ Three applications-optimized speed grades
■ SP3070E-72E: 250kbps slew-limited
■ SP3073E-75E: 500kbps slew-limited
■ SP3076E-78E: 6Mbps high speed
■ Small form factor SO-narrow packages
■ Industrial (-40 to +85C) and Extended
(-40 to +25C) temperature grades
Now Available in Lead Free Packaging
aPPlICaTIONS
■ Industrial Control, Utility Meters Building Automation, Instrumentation, Point of Sale
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 +2V. Receivers will failsafe to logic 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 ±5kV (Air-Gap and
Human Body Model) and up to ±8kV Contact discharge (IEC 6000-4-2). The SP3070E-
SP3078E devices may not achieve optimal transmit performance if the connected receiver
includes a biasing network to 5.0V without a termination resistor. Please see ExarApplication
Note ANI#2 for further details.
SP3070E - SP3078E Family
±15kV ESD-Protected, 3.3V, 1/8 load, Failsafe
RS-485/RS422 Transceivers