SP3080E-3088E
Advanced-Failsafe RS-485/RS-422 Transceivers
1/8th Unit Load, Slew-Rate Limited, ±15kV ESD-Protected
FEATURES
• 5.0V single supply operation
• Receiver failsafe on open, shorted or terminated lines
• 1/8th Unit Load, 256 transceivers on bus
• Robust ESD protection for RS-485 pins
o ±15kV Air-Gap Discharge
o ±15kV Human Body Model
o ±8kV Contact Discharge
• Controlled driver slew rates
o 115kbps, Low EMI (SP3080E, SP3081E, 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
7 B
Vcc
8 PIN NSOIC
8 A
RO 2
SP308E
SP3084E
SP3087E
7 B
Full Duplex
5Y
DE 3
DI 4
DI 3
GND 4
5 GND
4 Vcc
NC
4 PIN NSOIC
RE 3
SP3080E
SP3083E
SP3086E
GND 7
6 A
6 Z
RO 2
DI 5
GND 6
• Motor Control
• Building Automation
• Security Systems
• Remote Meter Reading
• Long or un-terminated transmission lines
8 Vcc
SP3082E
SP3085E
SP3088E
Half Duplex
DE 4
APPLICATIONS
8 PIN NSOIC
3 NC
2 A
B
0 Z
Full Duplex
9 Y
8 NC
DESCRIPTION
The SP3080E-SP3088E family of RS-485 devices are designed for reliable, bidirectional communication 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 numbers 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 +12V. 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 ±15kV (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 shortcircuits by both an internal current limit and a thermal-overload shutdown. Devices are rated for industrial (-40 to +85ºC) operating temperatures. Receivers have exceptionally high input impedance,
which places only 1/8th 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 versions except the SP3081E, 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 • 510-668-7017 • www.exar.com
SP3080E-SP3088E_101_082611
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
DE 4
5
DI
6
GND
7
GND
10
D
DI
GND
RO
2
3
4
1
2
SP3080E, 115kbps slew rate limited
SP3083E, 500kbps slew rate limited
SP3086E, 20Mbps
Z
8-Pin Full Duplex
R
8
A
7
B
6
D
SP3081E, 115kbps slew rate limited
SP3084E, 500kbps slew rate limited
SP3087E, 20Mbps
Z
5 Y
R
RE
DE 3
DI 4
14-Pin Full Duplex
9 Y
8
NC
VCC 1
RO
14 VCC
13 NC
12 A
11 B
D
8-Pin Half Duplex
8 VCC
SP3082E, 115kbps slew rate limited
SP3085E, 500kbps slew rate limited
SP3088E, 20Mbps
7 B
6 A
5
GND
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3080E-SP3088E_101_082611
PIN ASSIGNMENTS
Pin Number
Full-Duplex
Half Duplex
SP3080E SP3081E
SP3082E
SP3083E SP3084E
SP3085E
SP3086E SP3087E
SP3088E
2
3
4
2
-
-
1
2
3
Pin Name
Pin Function
RO
Receiver Output. When RE is low
and if (A – B) ≥ -40mV, RO is high.
If (A – B) ≤ - 200mV, RO is low.
RE
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.
REREE
DE
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 noninverting output high and inverting
output low.
5
3
4
DI
6, 7
4
5
GND
Ground
9
5
-
Y
Non-inverting Driver Output
10
6
-
Z
Inverting Driver Output
11
7
-
B
Inverting Receiver Input
-
-
7
B
Inverting Receiver Input and
Inverting Driver Output
12
8
-
A
Non-inverting Receiver Input
-
-
6
A
Non-inverting Receiver Input and
Non-inverting Driver Output
14
1
8
VCC
1, 8, 13
-
-
NC
Positive Supply VCC. Bypass to
GND with a 0.1uF capacitor.
No Connect, not internally
connected
Note: On 14-pin packages connect both pins 6 and 7 to Ground.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3080E-SP3088E_101_082611
Absolute Maximum Ratings
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.
Supply Voltage (VCC).......................................................+ 7.0V
Input voltage at control input pins (RE, DE)... -0.3V to Vcc+0.3V
Driver input voltage (DI) ..............................-0.3V to Vcc+0.3V
Driver output voltage (A, B, Y, and Z) ............................+/-13V
Receiver output voltage (RO) .................-0.3V to (Vcc + 0.3V)
Receiver input voltage (A, B) .........................................+/-13V
Voltage input range, transient pulse, A, B, Y and Z
through 100Ω, see Figure 11 ......................................+/-65.0V
Package Power Dissipation:
Maximum Junction Temperature 150°C
8-Pin SO Θja = 128.4°C/W
14-Pin SO Θja = 86°C/W
Storage Temperature.......................................-65°C to +150°C
Lead Temperature (soldering, 10s)............................... +300°C
RECOMMENDED OPERATING CONDITIONS
Vcc=5V ±10%, Tmin to Tmax, unless otherwise noted, Typical values are Vcc=5V and Ta=25°C
Recommended Operating Conditions
Min.
Nom.
Max.
Unit
Supply Voltage, Vcc
4.5
5
5.5
V
Input Voltage on A and B pins
-7
12
V
High-level input voltage (DI, DE or RE), Vih
2
Vcc
V
Low-level input voltage (DI, DE or RE), Vih
0
0.8
V
Driver
-60
60
Receiver
-8
8
Output Current
Signaling Rate, 1/tui
Operating Free Air
Temperature, Ta
SP3080E, SP3081E, SP3082E
0.115
SP3083E, SP3084E, SP3085E
0.5
SP3086E, SP3087E, SP3088E
20
Industrial Grade (E)
-40
85
mA
Mbps
°C
Note: The least positive (most negative) limit is designated as the maxium value.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3080E-SP3088E_101_082611
ELECTRICAL CHARACTERISTICS
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital Input Signals: DI, DE, RE
Logic input thresholds
High, Vih
2.0
Low, Vil
0.8
Logic Input Current
Ta = 25°C, after first transition
±1
Input Hysteresis
Ta = 25°C
100
V
μA
mV
Driver
Differential Driver Output (Vod)
Differential Driver Output, Test 1
No Load
Vcc
Rl=100Ω (RS-422)
2
Rl=54Ω (RS-485)
1.5
Differential Driver Output, Test 2
Vcm = -7 to +12V
1.5
Change in Magnitude of Differential Output
Voltage (ΔVod) (Note 1)
Rl=54 or 100Ω
Driver Common Mode Output Voltage (Vcc)
Rl=54 or 100Ω
Change in Common Mode Output Voltage
(ΔVoc)
Driver Short Circuit Current Limit
Output Leakage Current (Full-duplex versions,
Y & Z pins) Note 2
V
Vcc
2.7
Vcc
V
Vcc
±0.2
V
3
V
Rl=54 or 100Ω
±0.2
V
-7V ≤ Vout ≤ +12V (Note 5)
±250
mA
DE=0,
Vout=12V
125
RE=0,
Vcc=0 or
5.5V
Vout= -7V
1
μA
-100
Receiver
Receiver Input Resistance
-7V ≤ Vcm ≤ 12V
Input Current (A, B pins)
DE=0,
RE=0,
Vcc=0 or
5.5V
Receiver Differential Threshold (VA-VB)
-7V ≤ Vcm ≤ 12V
96
Vin= -7V
125
-100
-200
Receiver Input Hysteresis
Receiver
Output
Voltage
KΩ
Vin= 12V
μA
-125
-40
25
mV
mV
Voh
Iout = -8mA, Vid = -40mV
Vcc-1.5
V
Vol
Iout = 8mA, Vid = -200mV
0.4
High-Z Receiver Output Current
Vcc =5.5V, 0 ≤ Vout ≤ Vcc
±1
μA
Receiver Output Short Circuit Current
0V ≤ Vro ≤ Vcc
± 95
mA
900
μA
1
μA
Supply and Protection
Supply
Current
IQ, Active Mode
No load, DI=0 or Vcc
Shutdown Mode
DE=0, RE=Vcc, DI=Vcc
Thermal Shutdown Temperature
Junction temperature
Thermal Shutdown Hysteresis
400
165
15
o
C
Notes:
1. 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 1nA.
4.Characterized, not 100% tested.
5. See Driver Short Circuit Limit Test Circuit.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3080E-SP3088E_101_082611
TIMING CHARACTERISTICS
Unless otherwise noted Vcc= +5.0±0.5V, ambient temperature TA from -40 to +85ºC
SP3080E, SP3081E, SP3082E
Conditions
Min. Typ. Max. Unit
DRIVER CHARACTERISTICS:
Data Signaling Rate (1 / tUI)
Duty Cycle 40 to 60%
115
Driver Propagation Delay (tPHL, tPLH)
RL = 54Ω, CL = 50pF,
500
Driver Output Rise/Fall Time (tR, tF)
Kbps
2600
ns
±200
ns
Driver Differential Skew (tPLH – tPHL)
Driver Enable to Output High (tDZH)
ns
667 1200 2500
3500
ns
Driver Enable to Output Low (tDZL)
SP3080E, SP3081E
3500
ns
Driver Disable from Output High (tDHZ)
100
ns
Driver Disable from Output Low (tDLZ)
100
ns
Shutdown to Driver Output Valid (tDZV)
6000
ns
SP3083E, SP3084E, SP3085E
Conditions
Min. Typ. Max. Unit
DRIVER CHARACTERISTICS:
Data Signaling Rate (1/ tUI)
Duty Cycle 40 to 60%
500
Driver Propagation Delay (tPHL, tPLH)
RL = 54Ω, CL = 50pF,
250
Driver Output Rise/Fall Time (tR, tF)
200
Kbps
1000
530
Driver Differential Skew (tPLH – tPHL)
Driver Enable to Output High (tDZH)
SP3083E, SP3084E
ns
±100
ns
2500
ns
Driver Enable to Output Low (tDZL)
2500
ns
Driver Disable from Output High (tDHZ)
100
ns
Driver Disable from Output Low (tDLZ)
100
ns
Shutdown to Driver Output Valid (tDZV)
4500
ns
SP3086E, SP3087E, SP3088E
DRIVER CHARACTERISTICS:
Data Signaling Rate (1 / tUI)
Conditions
Duty Cycle 40 to 60%
Driver Propagation Delay (tPHL, tPLH)
RL = 54Ω, CL = 50pF,
Min. Typ. Max. Unit
20
Driver Output Rise/Fall Time (tR, tF)
Mbps
12
20
6
10
ns
±5
ns
Driver Differential Skew (tPLH – tPHL)
Driver Enable to Output High (tDZH)
SP3086E, SP3087E
ns
150
ns
Driver Enable to Output Low (tDZL)
150
ns
Driver Disable from Output High (tDHZ)
50
ns
Driver Disable from Output Low (tDLZ)
50
ns
Shutdown to Driver Output Valid (tDZZV)
250
ns
Receiver CHARACTERISTICS:
Receiver Prop. Delay SP3080E - SP3085E
Conditions
Min. Typ. Max. Unit
200
ns
Receiver Prop. Delay SP3086E - SP3088E
75
ns
Prop. Delay Skew SP3080E-SP3085E
±30
ns
Prop. Delay Skew SP3086E-SP3088E
±5
ns
15
ns
Receiver Enable to Output High (tZH)
50
ns
Receiver Enable to Output Low (tZL)
50
ns
Receiver Disable from High (tHZ)
50
ns
Receiver Disable from Low (tLZ)
50
ns
3500
ns
600
ns
Receiver Output Rise/Fall Time
CL = 15pF, VID = ±2V,
75
CL = 15pf
Shutdown to Receiver Output Valid (tROV)
Time to Shutdown (Note 2,3,4)
ns
750
50
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
200
SP3080E-SP3088E_101_082611
TYPICAL PERFORMANCE CHARACTERISTICS
700
325
DE = Vcc
Shutdown Current (nA)
No-Load Supply Current (uA)
350
300
275
250
DE = GND
225
200
-60
-40
-20
0
20
40
60
80
650
600
550
500
100
-60
-40
-20
0
Temperature (ºC)
No-Load Supply Current vs Temperature
60
80
100
1000
No Load
VCC=5V
TA=25ºC
50% Square wave input
Driver and Receiver
10
No Load
VCC=5V
TA=25ºC
50% Square wave input
100
Supply Current (mA)
100
Supply Current (mA)
40
Shutdown Current vs Temperature
1000
Driver and Receiver
10
1
1
Receiver
Receiver
0.1
0.1
1
10
100
1000
1
10
Signaling Rate (kbps )
1000
Supply Current vs Signaling Rate
(SP3083E-SP3085E)
100
100
No Load
VCC=5V
90
TA=25ºC
50% Square wave input
80
Output Current (mA)
10
100
Signaling Rate (kbps )
Supply Current vs Signaling Rate
(SP3080E-SP3082E)
Supply Current (mA)
20
Tem perature (ºC)
Driver and Receiver
1
70
60
50
40
30
20
Receiver
10
0.1
1
10
100
1000
10000
0
100000
0
Signaling Rate (kbps )
1
2
3
4
5
6
Output Low Voltage (V)
Supply Current vs Signaling Rate
(SP3086E-SP3088E)
Output Current vs Driver Output Low Voltage
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3080E-SP3088E_101_082611
TYPICAL PERFORMANCE CHARACTERISTICS
-120
100
10
-80
Output Current (mA)
Output Current (mA)
-100
-60
-40
1
0.1
-20
0
0.01
-2
0
2
4
0
6
1
2
4
5
6
Driver Output Current
vs Differential Output Voltage
Output Current vs Driver Output High
Voltage
0.35
3.4
IOUT=8m A, VID=-200m V
3.2
0.3
R L =100Ω
3
Output Low Voltage (V)
Output Voltage (V)
3
Dif f erential Output Voltage (V)
Output High Voltage (V)
2.8
2.6
R L=54Ω
2.4
0.25
0.2
0.15
2.2
0.1
-60
2
-60
-40
-20
0
20
40
60
80
100
-40
Driver Differential Output Voltage vs
Temperature
40
60
80
100
VCC=5V
Receiver Output Voltage (V)
3.9
Output High Voltage (V)
20
5
IOUT=8m A, VID=-40m V
3.8
3.7
3.6
4
TA=25ºC
3
2
1
0
-40
-20
0
20
40
60
80
-200 -180 -160 -140 -120 -100
100
-80
-60
-40
-20
0
Differential Input Voltage (m V)
Temperature (º C)
Receiver Output Voltage vs Differential
Input Voltage
Receiver Output High Voltage vs
Temperature
0
Receiver Output Low Voltage vs
Temperature
4
3.5
-60
-20
Temperature (º C)
Tem perature (ºC)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3080E-SP3088E_101_082611
TYPICAL PERFORMANCE CHARACTERISTICS
60
960
950
Propagation Delay (ns)
Output Current (mA)
50
40
30
20
R L=54Ω,C L=50pF
940
930
920
910
900
890
10
880
870
-60
0
0
1
2
3
4
5
-40
-20
40
60
80
100
435
R L=54Ω,CL=50pF
950
R L=54Ω,C L=50pF
430
940
Propagation Delay (ns)
Propagation Delay (ns)
20
Driver Average Propagation Delay vs
Temperature (SP3080E-SP3082E)
Output Current vs Receiver Output Low
Voltage
960
0
Temperature (º C)
Output Low Voltage (V)
930
tPLH
920
910
900
tPHL
890
425
420
415
880
870
-60
-40
-20
0
20
40
60
80
410
-60
100
-40
-20
Temperature (ºC)
0
20
40
60
80
100
Temperature (º C)
Driver Propagation Delay vs Temperature
(SP3080E-SP3082E)
Driver Average Propagation Delay
vs Temperature (SP3083E-SP3085E)
35
460
30
450
25
440
Propagation Delay (ns)
Output Current (mA)
R L=54Ω,C L=50pF
20
15
10
tPLH
430
420
410
tPHL
5
400
0
0
1
2
3
4
390
-60
5
-40
-20
0
20
40
60
80
100
Temperature (º C)
Output High Voltage (V)
Output Current vs Receiver Output High
Voltage
Driver Propagation Delay
vs Temperature (SP3083E-SP3085E)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3080E-SP3088E_101_082611
TYPICAL PERFORMANCE CHARACTERISTICS
15
120
R L=54Ω,C L=50pF
C L=15pF, VID=±2V
110
13
tPLH
Propagation Delay (ns)
Propagation Delay (ns)
14
12
11
tPHL
10
9
100
90
80
8
-60
-40
-20
0
20
40
60
80
100
70
-60
Tem perature (ºC)
-40
-20
0
20
40
60
80
100
Temperature (º C)
Driver Propagation Delay
vs Temperature (SP3086E-SP3088E)
Receiver Average Propagation Delay
vs Temperature (SP3080E-SP3082E)
120
155
C L=15pF, VID=±2V
150
110
100
Propagation Delay (ns)
Propagation Delay (ns)
C L=15pF, VID=±2V
tPHL
90
tPLH
80
145
tPHL
140
135
130
tPLH
125
120
70
-60
-40
-20
0
20
40
60
80
115
-60
100
-40
-20
Temperature (ºC)
Receiver Propagation Delay
vs Temperature (SP3080E-SP3082E)
40
60
80
100
55
R L=54Ω,C L=50pF
53
13
C L=15pF, VID=±2V
51
12.5
Propagation Delay (ns)
Propagation Delay (ns)
Propagation Delay (ns)
20
Receiver Propagation Delay
vs Temperature (SP3083E-SP3085E)
13.5
12
11.5
11
49
47
tPHL
45
43
tPLH
41
39
10.5
10
-60
37
-40
-20
0
20
40
60
80
35
-60
100
-40
-20
0
20
40
60
80
100
Temperature (º C)
Temperature (º C)
Receiver Propagation Delay
vs Temperature (SP3086E-SP3088E)
Driver Average Propagation Delay
vs Temperature (SP3086E-SP3088E)
0
Temperature (º C)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
10
SP3080E-SP3088E_101_082611
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Propagation Delay
(SP3080E-SP3082E)
Driver and Receiver Hot Swap
Performance vs. Vcc
54
C L =15pF, V
Propagation Delay (ns)
52
ID
=±2V
50
48
46
44
Propagation
Delay (ns)
42
40
-60
-40
-20
0
20
40
60
80
100
Temperature (ºC)
Receiver Average Propagation Delay vs
Temperature (SP3086E-SP3088E)
Driver output Waveform
Low to High (SP3080E-SP3082E)
Driver output Waveform
High to Low (SP3080E-SP3082E)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
11
SP3080E-SP3088E_101_082611
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Propagation Delay
(SP3083E-SP3085E)
Driver and Receiver Waveform
High to Low (SP3080E-SP3082E)
Driver Output Waveform
High to Low (SP3083E-SP3085E)
Driver Output Waveform
Low to High (SP3083E-SP3085E)
Driver and Receiver Waveform
Low to High (SP3083E-SP3085E)
Driver and Receiver Waveform
Low to High (SP3080E-SP3082E)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
12
SP3080E-SP3088E_101_082611
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Propagation Delay
(SP3086E-SP3088E)
Driver Output Waveform
Low to High (SP3086E-SP3088E)
Driver Output Waveforms
High to Low (SP3086E-SP3088E)
Driver and Receiver Waveform
Low to High (SP3086E-SP3088E)
Driver and Receiver Waveform
High to Low (SP3086E-SP3088E)
Driver and Receiver Waveform
High to Low (SP3083E-SP3085E)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
13
SP3080E-SP3088E_101_082611
TYPICAL PERFORMANCE CHARACTERISTICS
Receiver Propagation Delay
(SP3086E-SP3088E)
Receiver Propagation Delay
(SP3080E-SP3082E)
Receiver Propagation Delay
(SP3083E-SP3085E)
Test Circuits
A
R/2
DI
VCC
D
VID
VOD
OUT
RE
R/2 VOC
Figure 2. Receiver DC Test Circuit
Figure 1. Driver DC Test Circuit
B
R
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
14
SP3080E-SP3088E_101_082611
Test Circuits
DI
RL
54Ω
Y
D
VOD
CL
50pF
Z
3.3V
DI
Vcc
Z
Y
VDIFF
VY – VZ
Vcc/2
0V
Vcc/2
t PLH
t PHL
VO 1/2VO
1/2VO
t DPLH
VO+
0V
VO–
t DPHL
90%
10%
tF
90%
10%
tR
t SKEW = |t DPLH - t DPHL|
Figure 3. Driver Propagation Delay Time Test Circuit and Timing Diagram
DE = 0 or Vcc
DI = 0 or Vcc
A/Y
IOSD
D
B/Z
100Ω
-7V to +12V V
Figure 4. Driver Short Circuit Current Limit Test Circuit
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
15
SP3080E-SP3088E_101_082611
Test Circuits
DE = 3.3V
DI = 0 or Vcc
375Ω
A/Y
D
60Ω
VOD
B/Z
375Ω
VCM
Figure 5. Driver Differential Output Test Circuit
Y
0 or Vcc
DI
OUT
Z
GENERATOR
S1
D
CL = 50pF
RL = 500Ω
50Ω
DE
Vcc/2
Vcc
0
tZL, tZL(SHDN)
OUT
0.25V
VOM = (VOL + Vcc)/2
0
tLZ
Figure 6. Driver Enable and Disable Times Test Circuit and Timing Diagram
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
16
SP3080E-SP3088E_101_082611
Test Circuits
Vcc
RL = 500Ω
Y
0 or Vcc
DI
D
OUT
Z
GENERATOR
S1
CL = 50pF
50Ω
Vcc/2
DE
Vcc
0
tZL, tZL(SHDN)
t LZ
Vcc OUT
VOM = (VOL + Vcc)/2
VOL
0.25V
Figure 7. Driver Enable and Disable Times Test Circuit and Timing Diagram
A
VID
R
B
RE
OUT
CL
15pF
+1V
A
B
OUT
t PHL
t PLH
1.5V
-1V
VOH
VOL
Figure 8. Receiver Propagation Delay Test Circuit and Timing Diagram
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
17
SP3080E-SP3088E_101_082611
Test Circuits
1.5V
S3
-1.5V
S1
B
A
R
S2
RE
GENERATOR
Vcc
1kΩ
CL= 15pF
50Ω
Figure 9. Receiver Enable and Disable Times Test Circuit
S1 is open, S2 is closed, S3 = 1.5V
3V
1.5V
RE
S1 is closed, S2 is open, S3 = -1.5V
3V
1.5V
RE
0V
t ZL,t ZL(SHDN)
t ZH, t ZH(SHDN)
VOH
OUT
VOH /2
VCC
VOL= VCC /2
OUT
VOL
0V
S1 is open, S2 is closed, S3 = 1.5V
S1 is closed, S2 is open, S3 = -1.5V
3V
RE
3V
1.5V
RE
tHZ
0.25V
OUT
1.5V
t LZ
VOH
0V
VCC
OUT
0V
0.25V
VOL
Figure 10. Receiver Enable and DisableTiming Diagram
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
18
SP3080E-SP3088E_101_082611
Test Circuits
Note: Test is performed to ensure survivability only. Normal operation
during transient is not specified.
Figure 11. Transient Over Voltage Tolerance Test Circuit
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
19
SP3080E-SP3088E_101_082611
FUNCTION TABLES
SP3080E, SP3083E, SP3086E (Full Duplex)
Transmitting
Receiving
Inputs
Inputs
Outputs
RE
DE
DI
Y
Z
RE
DE
X
1
1
1
0
0
X
1
0
0
1
0
0
X
1
0
X
Output
RO
X
VA - VB
≥ -40mV
1
0
X
≤-200mV
0
High-Z
0
X
Open/shorted
1
Shutdown
1
1
X
High-Z
1
0
X
Shutdown
SP3081E SP3084E, SP3087E (Full Duplex)
Receiving
Transmitting
Input
Outputs
DI
Y
Z
1
1
0
0
0
1
Open
1
0
Inputs
Output
VA - VB
RO
≥ -40mV
1
≤-200mV
0
Open/shorted
1
SP3082E SP3085E, SP3088E (Half Duplex)
Transmitting
RE
X
X
0
1
Inputs
DE
1
1
0
0
Receiving
Outputs
DI
1
0
X
X
A
1
0
Inputs
B
0
1
High-Z
Shutdown
Output
RE
DE
VA - VB
RO
0
X
≥ -40mV
1
0
X
≤-200mV
0
0
X
Open/shorted
1
1
1
X
High-Z
1
0
X
Shutdown
Note: Receiver inputs -200mV < VA - VB < -40mV, should be considered indeterminate
PRODUCT SELECTOR GUIDE
Part
Number
Duplex
Data Rate
(Mbps)
Shut-down
SP3080E
Full
0.115
Yes
Yes
256
SN75180
SP3081E
Full
0.115
No
No
256
SN75179
MAX3081
SP3082E
Half
0.115
Yes
Yes
256
SN75176
SP483, MAX3082
SP3083E
Full
0.5
Yes
Yes
256
SN75180
MAX3083
SP3084E
Full
0.5
No
No
256
SN75179
MAX3084
SP3085E
Half
0.5
Yes
Yes
256
SN75176
MAX3085
SP3086E
Full
20
Yes
Yes
256
SN75180
SP1491, MAX3086
SP3087E
Full
20
No
No
256
SN75179
SP1490, MAX3087
SP3088E
Half
20
Yes
Yes
256
SN75176
SP1481, MAX3088
Receiver &
Trans on Bus Foot-print
Driver Enable
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
20
pin-compatible
upgrade from:
MAX3080
SP3080E-SP3088E_101_082611
DESCRIPTION
DETAILED DESCRIPTION
SP3080E-SP3088E is a family of advanced
RS-485/RS-422 transceivers. Each contains
one driver and one receiver. These devices
feature fail-safe circuitry that guarantees a
logic-high receiver output when the receiver
inputs are open or shorted, or when they are
connected to a terminated transmission line
with all drivers disabled. SP3080E, SP3082E,
SP3083E, SP3085E, SP3086E and SP3088E
also feature a hot-swap capability allowing live
insertion without error data transfer.
The receiver thresholds of the SP3080E family,
are very precise and offset by at least a 40mV
noise margin from ground. This results in a
logic-high receiver output at zero volts input differential while maintaining compliance with the
EIA/TIA-485 standard of ±200mV.
HOT-SWAP CAPABILITY
When a micro-processor or other logic device
undergoes its power-up sequence its logicoutputs are typically at high impedance. In this
state they are unable to drive the DE and signals to a defined logic level. During this period,
noise, parasitic coupling or leakage from other
devices could cause standard CMOS enable inputs to drift to an incorrect logic level.
The SP3080E, SP3081E and SP3082E feature reduced slew-rate drivers that minimize
EMI and reduce reflections caused by improperly terminated cables, allowing error-free data
transmission up to 115kbps. The SP3083E,
SP3084E and SP3085E also offer slew-rate
limits allowing transmit speeds up to 500kbps.
The SP3086E, SP3087E, SP3088E driver slew
rates are not limited, making transmit speeds
up to 20Mbps possible.
If circuit boards are inserted into an energized
backplane (commonly called “live insertion” or
“hot-swap”) power may be suddenly applied to
all circuits. Without the hot-swap capability, this
situation could improperly enable the transceiver’s driver or receiver, driving invalid data onto
shared busses and possibly causing driver contention or device damage.
The SP3082E, SP3085E and SP3088E are
half-duplex transceivers, while the SP3080E,
SP3081E, SP3083E, SP3084E, SP3086E, and
SP3087E are full duplex transceivers.
The SP3080E family contains a special poweron-reset circuit that holds DE low and RE high
for approximately 10 microseconds. After this
initial power-up sequence the hot-swap circuit
becomes transparent, allowing for normal, unskewed enable and disable timings.
All devices operate from a single 5.0V supply.
Drivers are output short-circuit current limited.
Thermal-shutdown circuitry protects drivers
against excessive power dissipation. When activated, the thermal-shutdown circuitry places
the driver outputs into a high-impedance state.
±15KV ESD PROTECTION
ESD-protection structures are incorporated
on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver output and receiver inputs
of the SP3080E family have extra protection
against static electricity. Exar uses state of the
art structures to protect these pins against ESD
of ±15kV without damage. The ESD structures
withstand high ESD in all states: normal operation, shutdown, and powered down. After an
ESD event, the SP3080E - SP3088E keeps
working without latch-up or damage.
RECEIVER INPUT FILTERING
SP3080E-SP3085E receivers incorporate input
filtering in addition to input hysteresis. This filtering enhances noise immunity with differential
signals that have very slow rise and fall times.
Receiver propagation delay increases due to
this filtering.
ADVANCED FAIL SAFE
Ordinary RS485 differential receivers will be in
an indeterminate state whenever A - B is less
than ±200mV. This situation can occur whenever the data bus is not being actively driven.
The Advanced Failsafe feature of the SP3080E
family guarantees a logic-high receiver output
if the receiver’s differential inputs are shorted,
open-circuit, or if they are shunted by a termination resistor.
ESD protection can be tested in various ways.
The transmitter outputs and receiver inputs of
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
21
SP3080E-SP3088E_101_082611
DESCRIPTION
the SP3080E - SP3088E are characterized for
protection to the following limits:
±15kV using the Human Body Model
±8kV using the Contact Discharge
method specified in IEC 61000-4-2
±15kV Air-gap
LOW POWER SHUTDOWN MODE
Low-power shutdown mode is initiated by bringing both RE high and DE low simultaneously.
While in shutdown devices typically draw only
50nA of supply current. DE and RE may be tied
together and driven by a single control signal.
Devices are guaranteed not to enter shutdown
if RE is high and DE is low for less than 50ns. If
the inputs are in this state for at least 600ns, the
parts are shutdown.
ESD TEST CONDITIONS
ESD performance depends on a variety of
conditions. Contact Exar for a reliability report
that documents test setup, methodology and
results.
Enable times tZH and tZL apply when the part is
not in low-power shutdown state. Enable times
tZH(SHDN) and tZL(SHDN) apply when the parts
are shut down. The drivers and receivers take
longer to become enabled from low power shutdown mode tZL(SHDN) and tZL(SHDN) than from
driver/receiver-disable mode (tZH, tZL).
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and performance of finished equipment.
However, it does not specifically refer to integrated circuits. The SP3080E family helps you
design equipment to meet IEC 61000-4-2, without sacrificing board space and cost for external ESD-protection components.
DRIVER OUTPUT PROTECTION
Two mechanisms prevent excessive output current and power dissipation caused by faults or
by bus contention. First, a driver-current limit
on the output stage provides immediate protection against short circuits over the whole common-mode voltage range. Second, a thermalshutdown circuit forces the driver outputs into
a high-impedance state if junction temperature
becomes excessive.
The major difference between tests done using
the Human Body Model and IEC 61000-4-2 is
a higher peak current in IEC 61000-4-2 series
resistance is lower in the IEC 61000-4-2 model.
Hence, the ESD withstand voltage measured
to IEC 61000-4-2 is generally lower than that
measured using the human body model.
The air-gap test involves approaching the device with a charged probe. The contact discharge method connects the probe to the device before the probe is energized.
LINE LENGTH, EMI, AND REFLECTIONS
SP3080E - SP3085E feature controlled slewrate drivers that minimize EMI and reduce reflections caused by improperly terminated cables.
MACHINE MODEL
The machine model for ESD tests all pins using
a 200pF storage capacitor and zero discharge
resistance. The objective is to emulate the
stress caused when I/O pins are contacted by
handling equipment during test and assembly.
SP3080E - SP3083E driver rise and fall times
are limited to no faster than 667ns, allowing error-free data transmission up to 115kbps. The
SP3083E, SP3084E and SP3085E offer somewhat higher driver output slew-rate limits, allowing transmit speeds up to 500kbps.
256 TRANSCEIVERS ON THE BUS
The standard RS-485 receiver input impedance
is 12kΩ (1 unit load). A standard driver can
drive up to 32 unit loads. The SP3080E family of transceivers has only a 1/8th unit load receiver input impedance (96kΩ), thereby allowing eight times as many, up to 256, transceivers
to be connected in parallel on a communication
line. Any combination of these devices and other RS-485 transceivers up to a total of 32 unit
loads may be connected to the line.
The RS-485/RS-422 standard covers line
lengths up to 4,000ft. Maximum achievable
line length is a function of signal attenuation
and noise. Use of slew-controlled drivers such
as the SP3080E-SP3086E may help to reduce
crosstalk interference and permit communication over longer transmission lines.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
22
SP3080E-SP3088E_101_082611
DESCRIPTION
Termination prevents reflections by eliminating
the impedance mismatches on a transmission
line. Line termination is typically used if rise
and fall times are shorter than the round-trip
signal propagation time. Slew-limited drivers
may reduce or eliminate the need for cable termination in many applications.
Typical ApplicationS:
Half-Duplex
Network
H alf -D uplex N etw ork
Full-Duplex Network
Network
BBi-Directional
i-Directional Full-Duplex
Point to Multi-Point Repeater
Po int to Multi -point with Repeater
RRepeater
epeater
(optional)
(optional)
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23
SP3080E-SP3088E_101_082611
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
24
SP3080E-SP3088E_101_082611
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
25
SP3080E-SP3088E_101_082611
ORDERING INFORMATION
Part number LEAD FREE Tape & Reel
Temperature range
Package Type
SP3080EEN
-L
/TR
From -40 to +850C
14 pin nSOIC
SP3081EEN
-L
/TR
From -40 to +85 C
8 pin nSOIC
SP3082EEN
-L
/TR
From -40 to +850C
8 pin nSOIC
SP3083EEN
-L
/TR
From -40 to +85 C
14 pin nSOIC
SP3084EEN
-L
/TR
From -40 to +85 C
8 pin nSOIC
SP3085EEN
-L
/TR
From -40 to +85 C
8 pin nSOIC
SP3086EEN
-L
/TR
From -40 to +85 C
14 pin nSOIC
SP3087EEN
-L
/TR
From -40 to +850C
8 pin nSOIC
SP3088EEN
-L
/TR
From -40 to +85 C
8 pin nSOIC
0
0
0
0
0
0
All packages are available as lead free (RoHS compliant). To order add “-L” suffix to part number.
For Tape and Reel add “/TR”. Reel quantity is 2,500 for NSOIC.
Example: SP3082EEN-L/TR = lead free and Tape and Reel. SP3082EEN/TR = standard with Tape
and Reel.
revision history
DATE
REVISION
2/22/07
M
DESCRIPTION
06/23/09
1.0.0
Convert to Exar Format and change revision to 1.0.0.
08/26/11
1.0.1
Correct type error to Vcc range on page 4 from Vcc = 5.0V +/-5% to Vcc = 5.0V
+/-10%. Add +/-65V transient over voltage tolerance to ABS Maximum Ratings and
add Figure 11 test circuit.
Legacy Sipex Datasheet
Notice
EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for
illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked;
no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can
reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for
use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been
minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Copyright 2011 EXAR Corporation
Datasheet August 2011
For technical support please email Exar's Serial Technical Support group at: serialtechsupport@exar.com
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
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26
SP3080E-SP3088E_101_082611
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