SP3080E-3088E
Advanced-Failsafe RS-485/RS-422 Transceivers
/8th Unit Load, Slew-Rate Limited, ±5kV ESD-Protected
FEATURES
• 5.0V single supply operation
• Receiver failsafe on open, shorted or terminated lines
• /8th Unit Load, 256 transceivers on bus
• Robust ESD protection for RS-485 pins
o ±5kV Air-Gap Discharge
o ±5kV Human Body Model
o ±8kV Contact Discharge
• Controlled driver slew rates
o 5kbps, Low EMI (SP3080E, SP308E, SP3082E)
o 500kbps, Low EMI (SP3083E, SP3084E, SP3085E)
o High Speed, 20Mbps (SP3086E, SP3087E, SP3088E)
•Hot Swap glitch protection on control inputs
•Driver short circuit current limit and
thermal shutdown for overload protection
•Ultra-low 400μA quiescent current
•1μA shutdown mode (except SP3081E, SP3084E, SP3087E)
•Industry standard package footprints
RO
RE
2
DE
3
DI
4
8 PIN NSOIC
SP3082E
SP3085E
SP3088E
Half Duplex
8
Vcc
7
B
6
A
5
GND
Vcc
RO
2
DI
3
GND
4
8 PIN NSOIC
SP308E
SP3084E
SP3087E
Full Duplex
8
A
7
B
6
Z
5
Y
NC
RO 2
RE 3
DE 4
DI 5
GND 6
GND 7
4 PIN NSOIC
4 Vcc
3 NC
2 A
B
0 Z
9 Y
8 NC
APPLICATIONS
• Motor Control
• Building Automation
• Security Systems
• Remote Meter Reading
• Long or un-terminated transmission lines
SP3080E
SP3083E
SP3086E
Full Duplex
The SP3080E-SP3088E family of RS-485 devices are designed for reliable, bidirectional commu-
nication on multipoint bus transmission lines. Each device contains one differential driver and one
differential receiver. The SP3082E, SP3085E and SP3088E are half-duplex devices; other part num-
bers are full-duplex. All devices comply with TIA/EIA-485 and TIA/EIA-422 standards. Lead-free and
RoHS compliant packages are available for all models.
These devices are ruggedized for use in harsh operating conditions over the entire common-mode
voltage range from -7V to +2V. Receivers are specially designed to fail-safe to a logic high output
state if the inputs are left un-driven or shorted. All RS-485 bus-pins are protected against severe
ESD events up to ±5kV (Air-Gap and Human Body Model) and up to ±8kV Contact Discharge (IEC
61000-4-2). Drivers are protected from excess current flow caused by bus contention or output short-
circuits by both an internal current limit and a thermal-overload shutdown. Devices are rated for in-
dustrial (-40 to +85ºC) operating temperatures. Receivers have exceptionally high input impedance,
which places only /8th the standard load on a shared bus. Up to 256 transceivers may coexist while
preserving full signal margin.
All devices operate from a single 5.0V power supply and draw negligible quiescent power. All ver-
sions except the SP308E, SP3084E, and SP3087E may independently enable and disable their
driver and receiver and enter a low power shutdown mode if both driver and receiver are disabled.
All outputs maintain high impedance in shutdown or when powered-off.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP3080E-SP3088E_0_0826
DESCRIPTION
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
RO
1
2
R
3
RE
4
DE
5
DI
6
GND
7
GND
D
14 V
CC
13 NC
12 A
11 B
10
Z
4-Pin Full Duplex
SP3080E, 5kbps slew rate limited
SP3083E, 500kbps slew rate limited
SP3086E, 20Mbps
9 Y
8
NC
V
CC
1
RO
2
R
8-Pin Full Duplex
8
A
7
B
6
D
Z
SP308E, 5kbps slew rate limited
SP3084E, 500kbps slew rate limited
SP3087E, 20Mbps
DI
GND
3
4
5 Y
2
RE
DE 3
DI 4
RO
1
R
8 V
CC
7 B
6 A
5
GND
8-Pin Half Duplex
SP3082E, 5kbps slew rate limited
SP3085E, 500kbps slew rate limited
SP3088E, 20Mbps
D
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP3080E-SP3088E_0_0826
2
PIN ASSIGNMENTS
Pin Number
Full-Duplex
SP3080E SP308E
SP3083E SP3084E
SP3086E SP3087E
2
2
Half -
Duplex
SP3082E
SP3085E
SP3088E
RO
Receiver Output. When RE is low
and if (A – B) ≥ -40mV,
RO is high.
If (A – B) ≤ - 200mV,
RO is low.
Receiver Output Enable. When RE
is low, RO is enabled. When RE
is high, RO is high impedance.
Drive RE high and DE low to enter
shutdown mode. RE is a hot-swap
input.
Driver Output Enable. When DE
is high, outputs are enabled.
When DE is low, outputs are high
impedance. Drive DE low and RE
high to enter shutdown mode. DE
is a hot-swap input.
Driver Input. With DE high, a low
level on DI forces non-inverting
output low and inverting output
high. A high level on DI forces non-
inverting output high and inverting
output low.
Ground
Non-inverting Driver Output
Inverting Driver Output
Inverting Receiver Input
Inverting Receiver Input and
Inverting Driver Output
Non-inverting Receiver Input
Non-inverting Receiver Input and
Non-inverting Driver Output
Positive Supply V
CC
. Bypass to
GND with a 0.uF capacitor.
No Connect, not internally
connected
Pin Name
Pin Function
3
-
2
RE
REREE
4
-
3
DE
5
3
4
DI
6, 7
9
0
-
2
-
4
, 8, 3
4
5
6
7
-
8
-
-
5
-
-
-
7
-
6
8
-
GND
Y
Z
B
B
A
A
V
CC
NC
Note: On 4-pin packages connect both pins 6 and 7 to Ground.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP3080E-SP3088E_0_0826
3
ABSOLUTE MAxIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those indi-
cated in the operation sections of the specifications below
is not implied. Exposure to absolute maximum rating con-
ditions for extended periods of time may affect reliability.
Supply Voltage (V
CC
).......................................................+ 7.0V
Input voltage at control input pins (RE, DE)... -0.3V to V
cc
+0.3V
Driver input voltage (DI) ..............................-0.3V to V
cc
+0.3V
Driver output voltage (A, B, Y, and Z) ............................+/-3V
Receiver output voltage (RO) .................-0.3V to (Vcc + 0.3V)
Receiver input voltage (A, B) .........................................+/-3V
Voltage input range, transient pulse, A, B, Y and Z
through 100Ω, see Figure 11 ......................................+/-65.0V
Package Power Dissipation:
Maximum Junction Temperature 50°C
8-Pin SO Θ
ja
= 28.4°C/W
14-Pin SO Θ
ja
= 86°C/W
Storage Temperature.......................................-65°C to +50°C
Lead Temperature (soldering, 0s)............................... +300°C
Vcc=5V ±0%, T
min
to T
max
, unless otherwise noted, Typical values are Vcc=5V and T
a
=25°C
Recommended Operating Conditions
Supply Voltage, V
cc
Input Voltage on A and B pins
High-level input voltage (DI, DE or RE), V
ih
Low-level input voltage (DI, DE or RE), V
ih
Output Current
Driver
Receiver
Signaling Rate, /t
ui
SP3080E, SP308E, SP3082E
SP3083E, SP3084E, SP3085E
SP3086E, SP3087E, SP3088E
Operating Free Air
Temperature, T
a
Industrial Grade (E)
-40
Min.
4.5
-7
2
0
-60
-8
Nom.
5
Max.
5.5
2
V
cc
0.8
60
8
0.5
0.5
20
85
RECOMMENDED OPERATING CONDITIONS
Unit
V
V
V
V
mA
Mbps
°C
Note: The least positive (most negative) limit is designated as the maxium value.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP3080E-SP3088E_0_0826
4
ELECTRICAL CHARACTERISTICS
PARAMETER
Digital Input Signals: DI, DE, RE
High, V
ih
Low, V
il
T
a
= 25°C, after first transition
T
a
= 25°C
00
2.0
0.8
±
TEST CONDITIONS
MIN
TYP
MAx
UNIT
Logic input thresholds
Logic Input Current
Input Hysteresis
Driver
Differential Driver Output (V
od
)
Differential Driver Output, Test
Differential Driver Output, Test 2
Change in Magnitude of Differential Output
Voltage (ΔV
od
) (Note )
Driver Common Mode Output Voltage (Vcc)
Change in Common Mode Output Voltage
(ΔV
oc
)
Driver Short Circuit Current Limit
Output Leakage Current (Full-duplex versions,
Y & Z pins) Note 2
Receiver
Receiver Input Resistance
Input Current (A, B pins)
V
μA
mV
No Load
R
l
=100Ω (RS-422)
R
l
=54Ω (RS-485)
V
cm
= -7 to +2V
R
l
=54 or 100Ω
R
l
=54 or 100Ω
R
l
=54 or 100Ω
-7V ≤ V
out
≤ +12V (Note 5)
DE=0,
RE=0,
V
cc
=0 or
5.5V
V
out
=2V
V
out
= -7V
-00
2
.5
.5
2.7
V
cc
V
cc
V
cc
V
cc
±0.2
3
±0.2
±250
25
V
V
V
V
V
mA
μA
-7V ≤ V
cm
≤ 12V
DE=0,
RE=0,
Vcc=0 or
5.5V
V
in
= 2V
V
in
= -7V
96
25
-00
-200
-25
25
-40
KΩ
μA
mV
mV
V
0.4
±
± 95
μA
mA
Receiver Differential Threshold (VA-VB)
Receiver Input Hysteresis
Receiver
Output
Voltage
V
oh
V
ol
-7V ≤ V
cm
≤ 12V
I
out
= -8mA, V
id
= -40mV
I
out
= 8mA, V
id
= -200mV
V
cc
=5.5V, 0 ≤ V
out
≤ V
cc
0V ≤ V
ro
≤ V
cc
Vcc-.5
High-Z Receiver Output Current
Receiver Output Short Circuit Current
Supply and Protection
Supply
Current
IQ, Active Mode
Shutdown Mode
No load, DI=0 or V
cc
DE=0, RE=Vcc, DI=V
cc
Junction temperature
400
900
μA
μA
o
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
65
5
C
Notes:
. Change in Magnitude of Differential Output Voltage and Change in Magnitude of Common Mode Output Voltage are the changes in output voltage when DI input changes state.
2. Except devices which don’t have DE or RE inputs.
3. The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns the device does not enter shutdown. If the enable inputs
are held in this state for at least 600ns the device is assured to be in shutdown. In this low power mode most circuitry is disabled and supply current is typically nA.
4.Characterized, not 00% tested.
5. See Driver Short Circuit Limit Test Circuit.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP3080E-SP3088E_0_0826
5
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