SP3070E - SP3078E Family
±15kV ESD-Protected, 3.3V, 1/8 load, Failsafe
RS-485/RS422 Transceivers
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)
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: 6Mbps 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 +25ºC) 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 +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 Exar Application
Note ANI#2 for further details.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP3070E-SP3078E_02_2020
DEVICE aRCHITECTuRE aND BlOCK DIaGRaMS
Devices are available in three industry standard architectures and footprints. In each footprint
there are three speed grades available.
NC
R
1
2
R
14 V
CC
13 NC
12 A
11 B
4 Pin Full Duplex:
SP3070E, 250kbps slew limited
SP3073E, 500kbps slew limited
SP3076E, 6Mbps
REB 3
DE 4
D 5
6
GND
7
GND
D
10 Z
9 Y
8 NC
V
CC
1
2
R
R
8 A
7 B
6 Z
8 Pin Full Duplex:
SP307E, 250kbps slew limited
SP3074E, 500kbps slew limited
SP3077E, 6Mbps
D
GND
3
4
D
5 Y
RO
1
2
RE
DE 3
DI
4
D
R
8 V
CC
7 B
6 A
5
GND
8 Pin Half Duplex:
SP3072E, 250kbps slew limited
SP3075E, 500kbps slew limited
SP3078E, 6Mbps
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP3070E-SP3078E_02_2020
2
These are stress ratings only and functional operation of the device at these
ratings or any other above those indicated in the operation sections of the
specifications below is not implied. Exposure to absolute maximum rating
conditions for extended periods of time may affect reliability.
V
CC
.................................................................................................+6.0V
Input Voltage at control input pins (RE, DE).........................-0.3V to 6V
Driver Input Voltage (RE, DE)...............................................-0.3V to 6V
Driver Output Voltage (A, B, Y, & Z)....................................-8V to +3V
Receiver Input Voltage (A, B)..............................................-8V to +3V
Continuous Power Dissipation at T
A
= 70
o
C
8-pin SO (derate 5.88mW/
o
C above +70
o
C)................................47mW
4-pin SO (derate 8.33mW/
o
C above +70
o
C).............. .............667mW
Operating Temperature Ranges
SP307XE_MN..............................................................-40ºC to +25ºC
SP307XE_EN ................................................................-40ºC to +85ºC
Junction Temperature.................................................................+50ºC
Storage Temperature Range.......................................-65ºC to +50º C
Lead Temperature (soldering, 0s) ..........................................+300º C
aBSOluTE MaXIMuM RaTINGS
Unless otherwise noted V
CC
= +3.3 ±0.3V, ambient temperature T
MIN
< T
A
< T
MAX
. Typical values are at V
CC
= 3.3,
ambient temperature T
A
= +25ºC. The
♦ denotes the specifications which apply over the full operating
range un-
less otherwise noted.
PARAMETER
SYM.
MIN.
2
Differential Driver Output
V
OD
1.5
TYP.
MAX.
V
CC
V
CC
V
CC
Change in Magnitude of
Differential Output Voltage
Driver Common Mode Output
Voltage
Change in Magnitude of
Common Mode Output
Voltage
Input High Voltage
Input Low Voltage
Input Hysteresis
Input Current
Input Impedance First
Transition (Hotswap)
Output Leakage (Y and Z)
Full Duplex (A and B)
Driver Short-Circuit Current
V
OD
ElECTRICal CHaRaCTERISTICS
UNITS
®
CONDITIONS
RL = 100 (RS-422), Figure 1
V
®
V
V
®
®
RL = 54 (RS-485), Figure 1
No Load
RL = 54 or 100 , Figure 1
RL = 54 or 100 , Figure 1
0.2
V
CC
/2
3
V
OC
V
OC
±0.2
2
0.8
100
-1
1
1
10
+125
-100
0
-250
±250
0
V
V
V
mV
µA
k
®
®
®
®
®
®
RL = 54 or 100 , Figure 1
DE, DI, RE
DE, DI, RE
DE, DI, RE
DE, DI, RE
DE, RE
First transition will draw more
current (Hotswap)
DE = GND
V
CC
= GND or 3.6V
-7V
V
V
IN
= +12 V
V
IN
= -7V
V
IH
V
IL
V
HYS
I
IN
I
O
µA
I
OSD
mA
OUT
12V, (Figure 4A)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP3070E-SP3078E_02_2020
3
Unless otherwise noted V
CC
= +3.3 ±0.3V, ambient temperature T
MIN
< T
A
< T
MAX
. Typical values are at V
CC
= 3.3,
ambient temperature T
A
= +25ºC. The
♦ denotes the specifications which apply over the full operating
range un-
less otherwise noted.
ElECTRICal CHaRaCTERISTICS
PARAMETERS
Input Current (A and B)
Half Duplex
Thermal-Shutdown Threshold
Thermal Shutdown Hysteresis
RECEIVER
Receiver Differential Threshold
(Sensitivity)
Receiver Input Hysteresis
RO Output High Voltage
RO Output Low Voltage
Tri-State Output Current at
Receiver
Receiver Input Resistance
Receiver Output Short-Circuit
Current
SUPPLY CURRENT
SYM
MIN
TYP
MAX
125
UNITS
®
CONDITIONS
DE = GND
V
CC
= GND or 3.6
V
IN
= +12V
V
IN
= -7V
I
A,B
µA
-100
165
15
ºC
ºC
®
T
TS
T
TSH
®
®
V
TH
V
TH
-200
-125
15
-50
mV
mV
V
®
®
®
®
®
- 7 V V
CM
1 2 V
Va + Vb = 0V
I
O
= -1mA
I
O
= 1mA
0 V
O
V
OH
V
OL
I
OZR
R
IN
I
OZR
Vcc -
0.6
0.4
+/-1
96
±60
V
µA
k
mA
V
CC
-7V V
0V V
CM
12V
V
RO
CC
0.8
Supply Current
I
CC
0.8
0.8
Supply Current in Shutdown
mode
ESD PROTECTION
±15
ESD Protection for Y, Z, A, and B
±15
±8
I
SHDN
0.05
1.5
1.5
1.5
3
µA
mA
®
No Load, RE = 0, DE = V
CC
No Load, RE = V
CC
, DE = V
CC
No Load, RE = 0, DE = 0
RE = V
CC
, DE = GND
Human Body Model
kV
®
Air Gap (IEC 1000-4-2)
Contact (IEC 1000-4-2)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP3070E-SP3078E_02_2020
4
DRIVER SWITCHING CHaRaCTERISTICS
Unless otherwise noted V
CC
= +3.3 ±0.3V, ambient temperature T
MIN
< T
A
< T
MAX
. Typical values are at V
CC
= 3.3,
ambient temperature T
A
= +25ºC.
SP3070E, SP3071E & SP3072E Driver Switching Characteristics
DRIVER CHARACTERISTICS:
Data Signaling Rate
Driver Propagation Delay (t
PHL
, t
PLH
)
Driver Output Rise/Fall Time (t
R
, t
F
)
Driver Differential Skew (t
PLH
– t
PHL
)
Driver Enable to Output High (t
ZH
)
Driver Enable to Output Low (t
ZL
)
Driver Disable from Output High (t
HZ
)
Driver Disable from Output Low (t
LZ
)
Driver Enable from Shutdown to Output
High (t
ZH(SHDN)
)
Driver Enable from Shutdown to Output
Low (t
ZL(SHDN)
)
Time to Shutdown (t
SHDN
)
Figure 4
Figure 5
50
R
L
= 500Ω, C
L
= 50pF,
Figure 4 & 5
Conditions
Duty Cycle 40 to 60%
R
L
= 54Ω, C
L
= 50pF,
Figure 2 & 3
Min. Typ. Max. Unit
250
250
350
500
600
200
2500
2500
00
00
5500
5500
200 600
Kbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
RECEIVER SWITCHING CHaRaCTERISTICS
Unless otherwise noted V
CC
= +3.3 ±0.3V, ambient temperature T
MIN
< T
A
< T
MAX
. Typical values are at V
CC
= 3.3,
ambient temperature T
A
= +25ºC.
SP3070E, SP3071E & SP3072E Receiver Switching Characteristics
RECEIVER CHARACTERISTICS:
Data Signaling Rate
Receiver Propagation Delay (t
PLH
, t
PHL
)
Propagation Delay Skew (t
PLH
, t
PHL
)
Receiver Enable to Output High (t
ZH
)
Receiver Enable to Output Low (t
ZL
)
Receiver Disable from Output High (t
HZ
)
Receiver Disable from Output Low (t
LZ
)
Figure 8
Figure 8
Figure 8
Figure 8
Conditions
Duty Cycle 40 to 60%
C
l
=15pF, Figure 6 & 7
Min. Typ. Max. Unit
250
200
30
50
50
00
200
4000
4000
50
200
600
Kbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
Receiver Enable from Shutdown to Output
Figure 8
High
Receiver Enable from Shutdown to Output
Figure 8
Low
Time to Shutdown (t
SHDN
)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP3070E-SP3078E_02_2020
5
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