XR3081XID-F [EXAR]
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 5V TRANSCEIVERS;
| 型号： | XR3081XID-F |
| 厂家： | 
EXAR CORPORATION |
| 描述： | HIGH OUTPUT 18V TOLERANT RS-485/RS-422 5V TRANSCEIVERS 输出元件 |
| 文件： | 总24页 (文件大小：834K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
JULY 2015
REV. 1.0.2
GENERAL DESCRIPTION
FEATURES
The XR3080-88X family of high performance RS-485/
422 devices are designed for improved performance in
noisy industrial environments and increased tolerance
to system faults.
40% Higher SNR (Signal-to-Noise Ratio)
compared to other RS-485 devices (2.1V vs. 1.5V)
±18V Fault Tolerance on Analog Bus pins
2.1V Driver Output (Profibus Compliant)
Robust ESD (ElectroStatic Discharge) Protection:
The analog bus pins can withstand direct shorts up to
±18V, and are protected against ESD events up to
±15kV. The Profibus compliant differential output deliv-
ers 40% higher SNR than standard RS-485/422
devices, affording additional noise margin or extended
cable lengths.
±15kV IEC 61000-4-2 Air Gap Discharge
± 8kV IEC 61000-4-2 Contact Discharge
±15kV Human Body Model
± 4kV Human Body Model on non-bus pins
+4.5V to +5.5V Operation (5V ± 10%)
The receivers include full fail-safe circuitry, guarantee-
ing a logic-high receiver output when the receiver
inputs are open, shorted, or undriven. The receiver
input impedance is at minimum 96k (1/8 unit load),
allowing up to 256 devices on the bus while preserving
the full signal margin.
300µA Idle Current, 1nA Shutdown Current
Enhanced Receiver Fail-Safe Protection for Open,
Shorted, or Terminated but Idle Data Lines
Hot-Swap Glitch Protection on DE and RE Pins
Driver Short Circuit Current Limit and Thermal
Shutdown for Overload Protection
The drivers are protected by short circuit detection as
well as thermal shutdown, and maintain high imped-
ance in shutdown or when powered off. The XR3080-
85X drivers are slew limited for reduced EMI and error-
free communication over long or unterminated data
cables.
th
1/8 Unit Load Allows up to 256 Devices on Bus
Operating Temperature Range:
Industrial -40°C to 85°C
Extended -40°C to 125°C
Industry Standard 8 and 14 NSOIC Packages
The devices with DE and RE pins include hot swap cir-
cuitry to prevent false transitions on the bus during
powerup or live insertion, and can enter a 1nA low cur-
rent shutdown mode for extreme power savings.
The transceivers draw less than 600µA from a +5.0V
supply, and typically only 300µA when idling with the
receivers active.
TYPICAL APPLICATIONS
Motor Control
1
2
3
4
8
7
6
5
RO
RE
DE
DI
VCC
R
D
Security Systems
B/Z
A/Y
GND
Building and Process Automation
Remote Utility Meter Reading
Energy Monitoring and Control
Long or Unterminated Transmission Lines
Profibus DP Fieldbus Networks
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
REV. 1.0.2
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 to the specifications below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect reliability and cause permanent damage to the
device.
VCC
-0.3V to +7.0V
-0.3V to +7.0V
Input Voltage at Control and Driver Input (RE, DE, and DI)
Receiver Output Voltage (RO)
-0.3V to (VCC + 0.3V)
Driver Output Voltage (A, B, Y and Z)
±18V
±18V
Receiver Input Voltage (A and B, half or full duplex)
Transient Voltage Pulse, through 100
Figure 6
±70V
Driver Output Current
±250mA
-65°C to +150°C
+300°C
Storage Temperature Range
Lead Temperature (soldering, 10s)
Package Power Dissipation
8-Pin SO
JA = 128.4°C/W
Maximum Junction Temperature = +150°C
14-Pin SO JA = 86°C/W
CAUTION:
ESD (Electrostatic Discharge) sensitive device. Permanent damage may occur on unconnected devices
subject to high energy electrostatic fields. Unused devices must be stored in conductive foam or shunts.
Personnel should be properly grounded prior to handling this device. The protective foam should be
discharged to the destination socket before devices are removed.
2
XR3080-88X
REV. 1.0.2
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
ORDERING INFORMATION
PART NUMBER
XR3080XID-F
XR3081XID-F
XR3082XID-F
XR3083XID-F
XR3084XID-F
XR3085XID-F
XR3086XID-F
XR3087XID-F
XR3088XID-F
XR3080XED-F
XR3081XED-F
XR3082XED-F
XR3083XED-F
XR3084XED-F
XR3085XED-F
XR3086XED-F
XR3087XED-F
XR3088XED-F
DUPLEX
Full
Full
Half
Full
Full
Half
Full
Full
Half
Full
Full
Half
Full
Full
Half
Full
Full
Half
DATA RATE
250kbps
250kbps
250kbps
1Mbps
PACKAGE
TEMPERATURE RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
14-pin Narrow SOIC
8-pin Narrow SOIC
8-pin Narrow SOIC
14-pin Narrow SOIC
8-pin Narrow SOIC
8-pin Narrow SOIC
14-pin Narrow SOIC
8-pin Narrow SOIC
8-pin Narrow SOIC
14-pin Narrow SOIC
8-pin Narrow SOIC
8-pin Narrow SOIC
14-pin Narrow SOIC
8-pin Narrow SOIC
8-pin Narrow SOIC
14-pin Narrow SOIC
8-pin Narrow SOIC
8-pin Narrow SOIC
1Mbps
1Mbps
20Mbps
20Mbps
20Mbps
250kbps
250kbps
250kbps
1Mbps
1Mbps
1Mbps
20Mbps
20Mbps
20Mbps
NOTE: Tape and Reel part numbers are XR30xxXIDTR-F or XR30xxXEDTR-F , -F = Green / RoHS Compliant
3
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
REV. 1.0.2
ELECTRICAL CHARACTERISTICS
Unless otherwise noted: VCC = +5.0V ±10%, TA = TMIN to TMAX. Typical values are at VCC = 5.0V, TA = +25°C.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
DRIVER DC CHARACTERISTICS
VCC
Supply Voltage Range
4.5
3
5.5
VCC
VCC
V
V
V
V
V
No Load
RL = 100 (RS-422), Figure 3
RL = 54 (RS-485), Figure 3
-7V VCM +12V, Figure 4
3
VOD
Differential Driver Output
VCC
VCC
2.1
2.1
Change in Magnitude of
Differential Output Voltage
VOD
VCM
±0.2
3
V
V
V
RL = 100 (RS-422), or
RL = 54 (RS-485),
Figure 3, Note 1
Driver Common-Mode Output
Voltage (steady state)
VCC / 2
Change in Magnitude of
VCM
±0.2
Common-Mode Output Voltage
VIH
VIL
2.0
V
V
Logic Input High
Logic Input Low
Logic Input Thresholds (DI, DE, RE)
0.8
VHYS
Input Hysteresis (DI, DE, RE)
100
100
mV
0V VIN VCC
,
IIN
Logic Input Current (DI, DE, RE)
±1
µA
µA
µA
µA
µA
After first transition, Note 2
Logic Input Current (DE and RE)
Input Current (A and B)
±200
125
Until first transition, Note 2
VOUT = +12V, DE = 0V,
VCC = 0V or 5.5V
IA, B
VOUT = -7V, DE = 0V,
VCC = 0V or 5.5V
-100
-100
VOUT = +12V, DE = 0V,
VCC = 0V or 5.5V
125
Output Leakage (Y and Z)
Full Duplex (Note 2)
IOL
VOUT = -7V, DE = 0V,
VCC = 0V or 5.5V
µA
IOSD
±250
mA
-7V VOUT +12V, Figure 5
Driver Short-Circuit Output Current
DRIVER THERMAL CHARACTERISTICS
TTS
175
15
°C
°C
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Junction temperature, Note 4
Note 4
TTSH
4
XR3080-88X
REV. 1.0.2
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
Unless otherwise noted: VCC = +5.0V ±10%, TA = TMIN to TMAX. Typical values are at VCC = 5.0V, TA = +25°C.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
RECEIVER DC CHARACTERISTICS
Receiver Differential Threshold
VTH
-7V VCM +12V
-200
-125
25
-50
mV
Voltage (VA - VB)
VOH
VOH
VOL
VCM = 0V
Receiver Input Hysteresis
mV
V
V
-1.5
IOUT = -4mA
Receiver Output High Voltage (RO)
Receiver Output Low Voltage (RO)
High-Z Receiver Output Current
Receiver Input Resistance
CC
IOUT = 4mA
0.4
±1
V
IOZR
RIN
0V VOUT VCC
-7V VCM +12V
µA
k
96
Receiver Output Short-Circuit
Current
IOSC
0V VRO VCC
±95
mA
SUPPLY CURRENT
No Load, RE = 0V, DE = VCC
DI = 0V
425
600
µA
No Load, RE = VCC, DE = VCC
DI = 0V
ICC
Supply Current
330
300
600
600
1
µA
µA
µA
µA
No Load, RE = 0V, DE = 0V
Receiver A and B inputs open
RE = VCC, DE = 0V,
Temperature grade I
0.001
0.001
ISHDN
Supply Current in Shutdown Mode
RE = VCC, DE = 0V
Temperature grade E
3
ESD PROTECTION
±15
±15
±8
kV
kV
kV
kV
Human Body Model
IEC 61000-4-2 Airgap
IEC 61000-4-2 Contact
Human Body Model
ESD Protection for A, B, Y, and Z
ESD Protection for all other pins
±4
5
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
Unless otherwise noted: VCC = +5.0V ±10%, TA = TMIN to TMAX. Typical values are at VCC = 5.0V, TA = +25°C.
REV. 1.0.2
SYMBOL
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
DRIVER AC CHARACTERISTICS
XR3080X, XR3081X and XR3082X (250kbps)
tDPLH
tDPHL
Driver Prop. Delay (Low to High)
Driver Prop. Delay (High to Low)
Differential Driver Output Skew
350
350
1500
1500
200
ns
ns
ns
CL = 50pF, RL = 54,
20
|tDPLH-tDPHL
|
Figure 7
Driver Differential Output
Rise or Fall Time
tDR, tDF
400
250
1500
ns
1/tUI, Duty Cycle 40 to 60%
Maximum Data Rate
kbps
ns
tDZH
tDZL
tDHZ
tDLZ
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
200
200
6
2500
2500
100
ns
CL = 50pF, RL = 500,
Figure 8
ns
6
100
ns
Driver Enable from Shutdown to
Output High
tDZH(SHDN)
5500
ns
CL = 50pF, RL = 500,
Figure 8
Driver Enable from Shutdown to
Output Low
tDZL(SHDN)
tSHDN
5500
600
ns
ns
Time to Shutdown
50
200
Notes 3 and 4
RECEIVER AC CHARACTERISTICS
XR3080X, XR3081X and XR3082X (250kbps)
tRPLH
tRPHL
Receiver Prop. Delay (Low to High)
Receiver Prop. Delay (High to Low)
Receiver Propagation Delay Skew
Maximum Data Rate
200
200
30
ns
ns
CL = 15pF, VID = ±2V,
VID Rise and Fall times < 15ns
Figure 9
ns
|tRPLH-tRPHL
|
1/tUI, Duty Cycle 40 to 60%
250
kbps
ns
tRZH
tRZL
tRHZ
tRLZ
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output High
Receiver Disable from Output Low
50
50
50
50
ns
CL = 15pF, RL = 1k,
Figure 10
ns
ns
Receiver Enable from Shutdown
to Output High
tRZH(SHDN)
3500
ns
CL = 15pF, RL = 1k,
Figure 10
Receiver Enable from Shutdown
to Output Low
tRZL(SHDN)
tSHDN
3500
600
ns
ns
Time to Shutdown
50
200
Notes 3 and 4
6
XR3080-88X
REV. 1.0.2
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
Unless otherwise noted: VCC = +5.0V ±10%, TA = TMIN to TMAX. Typical values are at VCC = 5.0V, TA = +25°C.
SYMBOL
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
DRIVER AC CHARACTERISTICS
XR3083X, XR3084X and XR3085X (1Mbps)
tDPLH
tDPHL
Driver Prop. Delay (Low to High)
Driver Prop. Delay (High to Low)
Differential Driver Output Skew
150
150
5
500
ns
ns
ns
500
50
CL = 50pF, RL = 54,
|tDPLH-tDPHL
|
Figure 7
Driver Differential Output
Rise or Fall Time
tDR, tDF
100
1
200
300
ns
1/tUI, Duty Cycle 40 to 60%
Maximum Data Rate
Mbps
ns
tDZH
tDZL
tDHZ
tDLZ
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
1000
1000
60
2500
2500
100
ns
CL = 50pF, RL = 500,
Figure 8
ns
60
100
ns
Driver Enable from Shutdown to
Output High
tDZH(SHDN)
2500
4500
ns
CL = 50pF, RL = 500,
Figure 8
Driver Enable from Shutdown to
Output Low
tDZL(SHDN)
tSHDN
2500
200
4500
600
ns
ns
Time to Shutdown
50
Notes 3 and 4
RECEIVER AC CHARACTERISTICS
XR3083X, XR3084X and XR3085X (1Mbps)
tRPLH
tRPHL
Receiver Prop. Delay (Low to High)
Receiver Prop. Delay (High to Low)
Receiver Propagation Delay Skew
Maximum Data Rate
200
ns
ns
CL = 15pF, VID = ±2V,
200
30
VID Rise and Fall times < 15ns
Figure 9
ns
|tRPLH-tRPHL
|
1/tUI, Duty Cycle 40 to 60%
1
Mbps
ns
tRZH
tRZL
tRHZ
tRLZ
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output High
Receiver Disable from Output Low
50
50
50
50
ns
CL = 15pF, RL = 1k,
Figure 10
ns
ns
Receiver Enable from Shutdown
to Output High
tRZH(SHDN)
3500
ns
CL = 15pF, RL = 1k,
Figure 10
Receiver Enable from Shutdown
to Output Low
tRZL(SHDN)
tSHDN
3500
600
ns
ns
Time to Shutdown
50
200
Notes 3 and 4
7
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
Unless otherwise noted: VCC = +5.0V ±10%, TA = TMIN to TMAX. Typical values are at VCC = 5.0V, TA = +25°C.
REV. 1.0.2
SYMBOL
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
DRIVER AC CHARACTERISTICS
XR3086X, XR3087X and XR3088X (20Mbps)
tDPLH
tDPHL
Driver Prop. Delay (Low to High)
Driver Prop. Delay (High to Low)
Differential Driver Output Skew
20
ns
ns
ns
20
5
CL = 50pF, RL = 54,
|tDPLH-tDPHL
|
Figure 7
Driver Differential Output
Rise or Fall Time
tDR, tDF
15
ns
1/tUI, Duty Cycle 40 to 60%
Maximum Data Rate
20
Mbps
ns
tDZH
tDZL
tDHZ
tDLZ
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
30
30
30
30
ns
CL = 50pF, RL = 500,
Figure 8
ns
ns
Driver Enable from Shutdown to
Output High
tDZH(SHDN)
250
ns
CL = 50pF, RL = 500,
Figure 8
Driver Enable from Shutdown to
Output Low
tDZL(SHDN)
tSHDN
250
600
ns
ns
Time to Shutdown
50
200
Notes 3 and 4
RECEIVER AC CHARACTERISTICS
XR3086X, XR3087X and XR3088X (20Mbps)
tRPLH
tRPHL
Receiver Prop. Delay (Low to High)
Receiver Prop. Delay (High to Low)
Receiver Propagation Delay Skew
Maximum Data Rate
40
ns
ns
CL = 15pF, VID = ±2V,
40
5
VID Rise and Fall times < 15ns
Figure 9
ns
|tRPLH-tRPHL
|
1/tUI, Duty Cycle 40 to 60%
20
Mbps
ns
tRZH
tRZL
tRHZ
tRLZ
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output High
Receiver Disable from Output Low
30
30
30
30
ns
CL = 15pF, RL = 1k,
Figure 10
ns
ns
Receiver Enable from Shutdown
to Output High
tRZH(SHDN)
2200
ns
CL = 15pF, RL = 1k,
Figure 10
Receiver Enable from Shutdown
to Output Low
tRZL(SHDN)
tSHDN
2200
600
ns
ns
Time to Shutdown
50
200
Notes 3 and 4
8
XR3080-88X
REV. 1.0.2
NOTE:
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
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. The hot swap feature disables the DE and RE inputs for the first 10µs after power is applied. Following this time
period these inputs are weakly pulled to their disabled state (low for DE, high for RE) until the first transition, after
which they become high impedance inputs.
3. The transceivers are put into shutdown by bringing RE High and DE Low simultaneously for at least 600ns. If the
control inputs are in this state for less than 50ns, the device is guaranteed to not enter shutdown. If the enable
inputs are held in this state for at least 600ns the device is assured to be in shutdown. Note that the receiver and
driver enable times increase significantly when coming out of shutdown.
4. This spec is guaranteed by design and bench characterization.
9
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
REV. 1.0.2
BLOCK DIAGRAMS
FIGURE 1. HALF DUPLEX (XR3082X, XR3085X, XR3088X)
1
2
3
4
8
7
6
5
RO
RE
DE
DI
VCC
R
D
B/Z
A/Y
GND
FIGURE 2. FULL DUPLEX (XR3080X, XR3081X, XR3083X, XR3084X, XR3086X, XR3087X)
1
2
3
4
5
6
7
14
N/C
RO
VCC
N/C
A
1
2
3
4
8
7
6
5
13
12
11
10
9
VCC
RO
A
B
Z
Y
R
D
R
D
RE
DI
DE
B
GND
DI
Z
GND
GND
Y
8
N/C
10
XR3080-88X
REV. 1.0.2
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
TEST FIGURES
FIGURE 3. DIFFERENTIAL DRIVER OUTPUT VOLTAGE
Z
Y
RL
2
DI = 0V or VCC
VOD
VCM
D
RL
2
DE = VCC
FIGURE 4. DIFFERENTIAL DRIVER OUTPUT VOLTAGE OVER COMMON MODE
Z
375Ω
60Ω
DI = 0V or VCC
VOD
VCM
D
375Ω
Y
DE = VCC
FIGURE 5. DRIVER OUTPUT SHORT CIRCUIT CURRENT
Z
IOSD
DI = 0V or VCC
D
-7V to +12V
V
Y
DE = 0V or VCC
11
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
REV. 1.0.2
FIGURE 6. TRANSIENT OVER-VOLTAGE TEST CIRCUIT
Device powered on or powered off
A or Z
Transceiver,
Generator, or
Receiver
100
VTEST
15us duration
15 duty cycle
B or Y
FIGURE 7. DRIVER PROPAGATION DELAY TEST CIRCUIT & TIMING DIAGRAM
3V
tSKEW = |tDPHL – tDPLH
|
DI
1.5V
1.5V
0V
Z
tDPLH
tDPHL
VOD
Y
VOD+
0V
VOD-
90%
10%
90%
VOD
(VY - VZ)
10%
tDR
tDF
Z
DI
RL
CL
VOD
D
Y
DE = VCC
12
XR3080-88X
REV. 1.0.2
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
FIGURE 8. DRIVER ENABLE AND DISABLE TIMING TEST CIRCUITS & TIMING DIAGRAMS
Z
Testing Z: DI = 0V
D
VOUT
Testing Y: DI = VCC
RL
CL
DE
Y
3V
DE
1.5V
1.5V
0V
tDZH
tDHZ
VOH
VOL
VOH + VOL
2
VOH - 0.25V
VOUT
VCC
Z
Y
RL
Testing Z: DI = VCC
Testing Y: DI = 0V
VOUT
D
CL
DE
3V
DE
1.5V
1.5V
0V
tDZL
tDLZ
VOH
VOH + VOL
2
VOUT
V
OL + 0.25V
VOL
13
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
REV. 1.0.2
FIGURE 9. RECEIVER PROPAGATION DELAY TEST CIRCUIT & TIMING DIAGRAM
B
RO
R
CL
A
RE = 0V
B
A
+1V
0V
-1V
tRPLH
tRPHL
VOH
VOL
1.5V
1.5V
RO
14
XR3080-88X
REV. 1.0.2
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
FIGURE 10. RECEIVER ENABLE AND DISABLE TEST CIRCUITS & TIMING DIAGRAMS
B
RO
R
RL
CL
RE
A
3V
0V
RE
1.5V
1.5V
tRZH
tRHZ
VA = VCC
VB = 0V
VOH
0V
VOH
2
V
OH - 0.25V
RO
VCC
B
A
RL
R
RO
CL
RE
3V
0V
RE
1.5V
1.5V
tRZL
tRLZ
VA = 0V
VB = VCC
VCC
VOL
VCC + VOL
2
RO
VOL + 0.25V
15
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
REV. 1.0.2
PIN DESCRIPTIONS
PIN NUMBER
HALF DUPLEX
FULL DUPLEX
PIN NAME
TYPE
DESCRIPTION
XR3082X
XR3085X
XR3088X
XR3081X
XR3080X
XR3083X
XR3086X
XR3084X
XR3087X
Receiver Output. When RE is low and
if (A-B) -50mV, RO is high.
If (A-B) -200mV, RO is Low.
1
2
2
-
2
3
RO
RE
Out
In
Receiver Output Enable (Hot Swap).
When RE is low, RO is enabled. When RE is High,
RO is high impedance. RE should be high and DE
should be low to enter shutdown mode.
Driver Output Enable (Hot Swap).
When DE is high, outputs are enabled. When DE is
low, outputs are high impedance. DE should be low
and RE should be high to enter shutdown mode.
3
4
-
4
5
DE
DI
In
In
Driver Input.
With DE high, a low level on DI forces non-Inverting
output low and inverting output high. Similarly, a
high level on DI forces non-Inverting output high
and inverting output low.
3
5
6
7
8
-
4
-
6, 7
GND
A
Pwr Ground.
Non-Inverting Receiver Input and
Non-Inverting Driver Output.
-
I/O
I/O
Pwr
In
Inverting Receiver Input and
Inverting Driver Output.
-
-
14
B
+5.0V Power Supply Input.
Bypass to ground with 0.1 µF capacitor.
VCC
1
8
7
5
6
-
12
A
B
Non-Inverting Receiver Input.
Inverting Reciever Input.
-
11
In
-
9
Y
Out Non-Inverting Driver Output.
Out Inverting Driver Output.
-
10
Z
-
1, 8, 13
N/C
-
No Connect, not internally connected.
16
XR3080-88X
REV. 1.0.2
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
PRODUCT DESCRIPTION
The XR3080-88X RS-485/422 devices are part of Exar’s X Series high performance serial interface product
line. The analog bus pins can survive direct shorts up to ±18V, and are protected against ESD events up to
±15kV. The Profibus compliant differential output delivers 40% higher SNR than other RS-485/422 devices,
affording additional noise margin or extended cable lengths.
ENHANCED FAILSAFE
Ordinary RS-485 differential receivers will be in an indeterminate state whenever the data bus is not being
actively driven. The enhanced failsafe feature of the XR3080-88X family guarantees a logic-high receiver
output when the receiver inputs are open, shorted, or when they are connected to a terminated transmission
line with all drivers disabled. In a terminated bus with all transmitters disabled, the receivers’ differential input
voltage is pulled to 0V by the termination. The XR3080-88X family interprets 0V differential as a logic high with
a minimum 50mV noise margin while maintaining compliance with the EIA/TIA-485 standard of ±200mV.
Although the XR3080-88X family does not need failsafe biasing resistors, it can operate without issue if biasing
is used.
RECEIVER INPUT FILTERING
XR3080-85X receivers incorporate internal filtering in addition to input hysteresis. This filtering enhances noise
immunity by ignoring signals that do not meet a minimum pulse width of 30ns. Receiver propagation delay
increases slightly due to this filtering. The high speed XR3086X, XR3087X and XR3088X devices do not have
this input filtering.
HOT-SWAP CAPABILITY
When V
is first applied the XR3080-88X family holds the driver enable and receiver enable inactive for
CC
approximately 10 microseconds. During power ramp-up other system ICs may drive unpredictable values, or
tristated lines may be influenced by stray capacitance. The hot-swap feature prevents the XR3080-88X family
from driving any output signal until power has stabilized. After the initial 10µs, the driver and receiver enable
pins are weakly pulled to their disabled states (low for DE, high for RE) until the first transition. After the first
transition, the DE and RE pins operate as high impedance inputs.
If circuit boards are inserted into an energized backplane (commonly called "live insertion" or "hot-swap")
power may suddenly be 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.
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 thermal-shutdown circuit forces the driver outputs into
a high-impedance state if junction temperature becomes excessive.
LINE LENGTH
The RS-485/RS-422 standard covers line lengths up to 4000ft. Maximum achievable line length is a function of
signal attenuation and noise. Termination prevents signal reflections by eliminating the impedance mismatches
on a transmission line. Line termination is generally used if rise and fall times are shorter than the round-trip
signal propagation time. Higher output drivers may allow longer cables to be used.
17
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
±15kV ESD PROTECTION
REV. 1.0.2
ESD protection structures are incorporated on all pins to protect against electrostatic discharges encountered
during handling and assembly. The driver outputs and receiver inputs of the XR3080-88X 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 XR3080-88X keep operating without latch-up or damage.
ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of the XR3080-88X
are characterized for protection to the following limits:
±15kV using the Human Body Model
± 8kV using the Contact Discharge Model
±15kV Air-gap Discharge Model
ESD TEST CONDITIONS
ESD performance depends on a variety of conditions. Contact Exar for a reliability report that documents test
setup, methodology and results.
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 XR3080-88X family helps you design equipment to meet
IEC 61000-4-2, without sacrificing board-space and cost for external ESD-protection components.
The major differences 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 of 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.
256 TRANSCEIVERS ON THE BUS
The standard RS-485 receiver input impedance is 12k Ohms (1 unit load). A standard driver can drive up to 32
th
unit loads. The XR3080-88X family of transceivers have a 1/8 unit load receiver input impedance of 96k,
allowing 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.
LOW POWER SHUTDOWN MODE
Low-power shutdown mode is initiated by bringing both RE high and DE low simultaneously. While in shutdown
devices draw less than 1µA 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 will enter shutdown.
Enable times t and t apply when the part is not in low-power shutdown state. Enable times t and
ZH(SHDN)
ZH
ZL
t
apply when the parts are shutdown. The drivers and receivers take longer to become enabled from
ZL(SHDN)
low-power shutdown t
and t
than from driver / receiver disable mode (t and t ).
ZH(SHDN)
ZL(SHDN) ZH ZL
18
XR3080-88X
REV. 1.0.2
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
FUNCTION TABLES
TABLE 1: FULL DUPLEX 14 PIN - XR3080X, XR3083X AND XR3086X
TRANSMITTING
Inputs
Outputs
RE
X
DE
1
DI
1
Y
1
0
Z
0
1
X
1
0
0
0
X
X
High-Z
1
0
Shutdown
TABLE 2: FULL DUPLEX 8 PIN - XR3081X, XR3084X AND XR3087X
TRANSMITTING
Input
DI
1
Outputs
Y
1
0
Z
0
1
0
TABLE 3: HALF DUPLEX 8 PIN - XR3082X, XR3085X AND XR3088X
TRANSMITTING
Inputs
Outputs
RE
X
DE
1
DI
1
A
1
0
B
0
1
X
1
0
0
0
X
X
High-Z
1
0
Shutdown
19
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
REV. 1.0.2
TABLE 4: FULL DUPLEX 14 PIN - XR3080X, XR3083X AND XR3086X
RECEIVING
Inputs
DE
Ouptut
RO
RE
VA - VB
0
0
0
1
1
X
X
X
1
1
-50mV
0
1
-200mV
Open/Shorted
X
X
High-Z
Shutdown
0
TABLE 5: FULL DUPLEX 8 PIN - XR3081X, XR3084X AND XR3087X
RECEIVING
Inputs
Output
RO
VA - VB
1
0
1
-50mV
-200mV
Open/Shorted
TABLE 6: HALF DUPLEX 8 PIN - XR3082X, XR3085X AND XR3088X
RECEIVING
Inputs
DE
Output
RE
VA - VB
RO
0
0
0
1
1
X
X
X
1
1
-50mV
0
1
-200mV
Open/Shorted
X
X
High-Z
Shutdown
0
Note: Receiver inputs -200mV VA - VB -50mV are considered indeterminate.
20
XR3080-88X
REV. 1.0.2
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
PRODUCT SELECTOR GUIDE
TABLE 7: SELECTION GUIDE
RECEIVER
TRANS ON
PART NUMBER
DUPLEX
DATA RATE
SHUTDOWN
AND DRIVER
ENABLE
FOOTPRINT
BUS
XR3080XID-F
XR3080XED-F
XR3081XID-F
XR3081XED-F
XR3082XID-F
XR3082XIE-F
XR3083XID-F
XR3083XED-F
XR3084XID-F
XR3084XED-F
XR3085XID-F
XR3085XED-F
XR3086XID-F
XR3086XED-F
XR3087XID-F
XR3087XED-F
XR3088XID-F
XR3088XED-F
Full
Full
Full
Full
Half
Half
Full
Full
Full
Full
Half
Half
Full
Full
Full
Full
Half
Half
Yes
Yes
No
Yes
Yes
No
256
256
256
256
256
256
256
256
256
256
256
256
256
256
256
256
256
256
SN75180
SN75180
SN75179
SN75179
SN75176
SN75176
SN75180
SN75180
SN75179
SN75179
SN75176
SN75176
SN75180
SN75180
SN75179
SN75179
SN75176
SN75176
250kbps
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
No
1Mbps
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
No
20Mbps
No
No
Yes
Yes
Yes
Yes
21
XR3080-88X
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
REV. 1.0.2
PACKAGE DRAWINGS
FIGURE 11. 8 NSOIC
22
XR3080-88X
REV. 1.0.2
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
FIGURE 12. 14 NSOIC
23
XR3080-88X
REV. 1.0.2
HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS
REVISION HISTORY
DATE
REVISION
1.0.0
DESCRIPTION
Production Release
April 2013
Sept 2013
July 2015
1.0.1
Type formatting changes
1.0.2
Added Figure 6, add -extended temp range -40°C to 125°C part numbers, updated
ISHDN for industrial and extended temp ranges, updated ordering information table
and table #7.
ECN# 1530-01
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to
improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any
circuits described herein, conveys no license under any patent or other right, and makes no representation that
the circuits are free of patent infringement. Charts and schedules contained here in 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 2015 EXAR Corporation
Datasheet July 2015.
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.
24
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