SP481EN-L/TR [EXAR]
Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDSO8, LEAD FREE, MO-012AA, SOIC-8;
| 型号： | SP481EN-L/TR |
| 厂家： | 
EXAR CORPORATION |
| 描述： | Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDSO8, LEAD FREE, MO-012AA, SOIC-8 驱动 信息通信管理 光电二极管 接口集成电路 驱动器 |
| 文件： | 总10页 (文件大小：163K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SP481/SP483/SP485
Low Power Half-Duplex RS-485 Transceivers
FEATURES
■ +5V Only
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
B
A
R
CC
■ Low Power BiCMOS
■ Driver/Receiver Enable
■ Slew Rate Limited Driver for
Low EMI (SP483)
■ Low Power Shutdown Mode (SP481
D
GND
and SP483)
SP485
■ RS-485 and RS-422 Drivers/Receivers
Top View
SP481, SP483, SP485
Pinout (Top View)
DESCRIPTION
The SP481, SP483, and the SP485 are a family of half-duplex transceivers that meet the
requirements of RS-485 and RS-422. Their BiCMOS design allows low power operation
without sacrificing performance. The SP481 and SP485 meet the requirements of RS-485
and RS-422 up to 5Mbps. Additionally, the SP481 is equipped with a low power Shutdown
mode. TheSP483isinternallyslewratelimitedtoreduceEMIandcanmeettherequirements
of RS-485 and RS-422 up to 250kbps. The SP483 is also equipped with a low power
Shutdown mode.
RO
1
2
3
4
R
8 Vcc
7 B
RE
DE
DI
6 A
5 GND
D
SP481, SP483, and SP485
Rev. 07/28/04
SP481/483/485 Low Power Half-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at
theseratingsoranyotherabovethoseindicatedintheoperationsections
ofthespecificationsbelowisnotimplied. Exposuretoabsolutemaximum
rating conditions for extended periods of time may affect reliability.
VCC........................................................................................................±12V
Input Voltages
Logic........................................................-0.3Vto(VCC+0.5V)
Drivers..................................................-0.3Vto(VCC+0.5V)
Receivers................................................................. ±15V
Output Voltages
Logic........................................................-0.3Vto(V +0.5V)
Drivers..................................................................C..C.. ±15V
Receivers............................................-0.3V to (VCC+0.5V)
StorageTemperature.......................................................-65˚Cto+150˚C
PowerDissipation...........................................................................500mW
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
SP481/SP483/SP485 DRIVER
DC Characteristics
Differential Output Voltage
Differential Output Voltage
GND
2
VCC
VCC
Volts
Volts
Unloaded; R = ∞ꢀ ; see figure 1
with load; R = 50Ω; (RS422);
see figure 1
Differential Output Voltage
Change in Magnitude of Driver
Differential Output Voltage for
Complimentary States
Driver Common-Mode
Output Voltage
1.5
VCC
Volts
with load; R = 27Ω; (RS485); see figure 1
0.2
3
Volts
R = 27Ωꢀor R = 50Ω; see figure 1
Volts
Volts
Volts
µA
R = 27Ωꢀor R = 50Ω; see figure 1
Applies to DE, DI, RE
Input High Voltage
2.0
Input Low Voltage
0.8
Applies to DE, DI, RE
Input Current
±10
Applies to DE, DI, RE
Driver Short-Circuit Current
VOUT = HIGH
35
35
250
250
mA
mA
-7V ≤ꢀVO ≤ꢀ+12V
-7V ≤ꢀVO ≤ꢀ+12V
VOUT = LOW
SP481/SP485 DRIVER
AC Characteristics
Maximum Data Rate
Driver Input to Output
5
Mbps
ns
RE = 5V, DE = 5V
30
30
5
60
60
10
40
tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF;
see figures 3 and 6
Driver Input to Output
Driver Skew
ns
ns
ns
tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF;
see figures 3 and 6
see figures 3 and 6,
tSKEW = | tDPLH - tDPHL
|
Driver Rise or Fall Time
15
From 10% to 90%; RDIFF = 54Ω,
CL1 = CL2 = 100pF; see figures 3 and 6
CL = 100pF; see figures 4 & 7; S2 closed
CL = 100pF; see figures 4 & 7; S1 closed
CL = 15pF; see figures 2 & 9; S1 closed
CL = 15pF; see figures 2 & 9; S2 closed
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
40
40
40
40
70
70
70
70
ns
ns
ns
ns
SP481/SP483/SP485 RECEIVER
DC Characteristics
Differential Input Threshold
Input Hysteresis
+0.2
Volts
mV
-7V ≤ꢀVCM ≤ꢀ+12V
VCM = 0V
10
15
5
Output Voltage High
2.4
0.0
Volts
Volts
IO = -4mA,VID = +200mV
IO = +4mA,VID = -200mV
Output Voltage Low
0.4
Three-State (High Impedance)
Output Current
±1
µA
kΩꢀ
mA
mA
mA
0.4V ≤ꢀVO ≤ꢀ2.4V; RE = 5V
-7V ≤ꢀVCM ≤ꢀ+12V
Input Resistance
Input Current (A, B); VIN = 12V
Input Current (A, B); VIN = -7V
Short-Circuit Current
+1.0
-0.8
95
DE = 0V, VCC = 0V or 5.25V, VIN = 12V
DE = 0V, VCC = 0V or 5.25V, VIN = -7V
0V ≤ꢀVCM ≤ꢀVCC
Rev. 07/28/04
SP481/483/485 Low Power Half-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.
PARAMETERS
SP481/SP485 RECEIVER
MIN.
TYP.
MAX. UNITS CONDITIONS
AC Characteristics
Maximum Data Rate
Receiver Input to Output
5
Mbps
ns
RE = 0V, DE = 0V
60
90
90
13
200
200
tPLH; RDIFF = 54Ω,
CL1 = CL2 = 100pF; Figures 3 & 8
tPHL; RDIFF = 54Ω,
Receiver Input to Output
60
ns
ns
CL1 = CL2 = 100pF; Figures 3 & 8
RDIFF = 54Ω; CL1 = CL2 = 100pF;
Figures 3 & 8
Diff. Receiver Skew ItPLH-tPHL
I
Receiver Enable to
Output Low
20
50
ns
CRL = 15pF; Figures 2 & 9; S1 closed
Receiver Enable to
Output High
20
20
20
50
50
50
ns
ns
ns
CRL = 15pF; Figures 2 & 9; S2 closed
CRL = 15pF; Figures 2 & 9; S1 closed
CRL = 15pF; Figures 2 & 9; S2 closed
Receiver Disable from Low
Receiver Disable from High
SP481
Shutdown Timing
Time to Shutdown
50
200
40
600
100
ns
ns
ns
ns
ns
RE = 5V, DE = 0V
Driver Enable from Shutdown
to Output High
CL = 100pF; See figures 4 & 7; S2 closed
CL = 100pF; See figures 4 & 7; S1 closed
CL = 15pF; See figures 2 & 9; S2 closed
CL = 15pF; See figures 2 & 9; S1 closed
Driver Enable from Shutdown
to Output Low
40
100
Receiver Enable from
Shutdown to Output High
Receiver Enable from
Shutdown to Output Low
300
300
1000
1000
POWER REQUIREMENTS
Supply Voltage
Supply Current
SP481/485
+4.75
+5.25
Volts
No Load
900
600
µA
µA
RE, DI = 0V or VCC; DE = VCC
RE = 0V, DI = 0V or 5V; DE = 0V
SP483
No Load
µA
µA
RE, DI = 0V or VCC; DE = VCC
RE=0V, DI = 0V or 5V; DE = 0V
SP481/SP483
Shutdown Mode
10
µA
DE = 0V, RE=VCC
ENVIRONMENTAL AND
MECHANICAL
Operating Temperature
Commercial (_C_)
Industrial (_E_)
Storage Temperature
Package
0
+70
+85
°C
°C
°C
-40
-65
+150
Plastic DIP (_S)
NSOIC (_N)
Rev. 07/28/04
SP481/483/485 Low Power Half-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
3
SP483 AC SPECIFICATIONS
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.
PARAMETERS
SP483 DRIVER
MIN.
TYP.
MAX. UNITS CONDITIONS
AC Characteristics
Maximum Data Rate
Driver Input to Output
250
250
kbps
800
800
100
2000
2000
800
ns
ns
ns
ns
tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF;
see figures 3 & 6
Driver Skew
250
tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF;
see figures 3 & 6
see figures 3 & 6,
Driver Rise and Fall Time
tSKEW = |tDPLH - tDPHL
|
250
2000
From 10% to 90%; RDIFF = 54Ω,
CL1 = CL2 = 100pF, see figures 3 & 6
CL = 100pF; See figures 4 & 7; S2 closed
CL = 100pF; See figures 4 & 7; S1 closed
CL = 15pF; See figures 4 & 7; S1 closed
CL = 15pF; See figures 4 & 7; S2 closed
Driver Enable to Output High
Driver Enable to Output Low
250
250
2000
2000
3000
3000
ns
ns
ns
ns
Driver Disable Time from Low 300
Driver Disable Time from High 300
SP483 RECEIVER
AC Characteristics
Maximum Data Rate
250
250
kbps
ns
Receiver Input to Output
2000
50
tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF;
Figures 3 & 8
Diff. Receiver Skew ItPLH-tPHL
I
100
20
ns
RDIFF = 54Ω, CL1 = CL2 = 100pF;
Figures 3 & 8
Receiver Enable to
Output Low
ns
CRL = 15pF; Figures 2 & 9; S1 closed
Receiver Enable to
Output High
20
20
20
50
50
50
ns
ns
ns
CRL = 15pF; Figures 2 & 9; S2 closed
CRL = 15pF; Figures 2 & 9; S1 closed
CRL = 15pF; Figures 2 & 9; S2 closed
Receiver Disable from Low
Receiver Disable from High
SP483
Shutdown Timing
Time to Shutdown
50
200
600
2000
2000
2500
2500
ns
ns
ns
ns
ns
RE = 5V, DE = 0V
Driver Enable from Shutdown
to Output High
CL = 100pF; See figures 4 & 7; S2 closed
CL = 100pF; See figures 4 & 7; S1 closed
CL = 15pF; See figures 4 & 7; S2 closed
CL = 15pF; See figures 4 & 7; S1 closed
Driver Enable from Shutdown
to Output Low
Receiver Enable from
Shutdown to Output High
Receiver Enable from
Shutdown to Output Low
PIN FUNCTION
Pin# Name Description
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
B
A
R
CC
1
2
RO
RE
Receiver Output.
Receiver Output Enable
Active LOW.
3
DE
Driver Output Enable
Active HIGH.
Driver Input.
GND Ground Connection.
4
5
6
DI
D
GND
A
Driver Output/Receiver Input
Non-inverting.
Top View
7
8
B
Driver Output/Receiver Input
Inverting.
Positive Supply 4.75V<Vcc< 5.25V.
SP481, SP483, SP485
Pinout (Top View)
Vcc
Rev. 07/16/02
SP481/483/485 Low Power Half-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
4
DESCRIPTION
Receivers
SP481, SP483, SP485
SP481, SP483, SP485
The SP481, SP483, and SP485 are half-duplex
differential transceivers that meet the require-
ments of RS-485 and RS-422. Fabricated with a
Sipex proprietary BiCMOS process, all three
products require a fraction of the power of older
bipolar designs.
The SP481, SP483, and SP485 receivers have
differential inputs with an input sensitivity as
low as ±200mV. Input impedance of the receiv-
ers is typically 15kΩ (12kΩ minimum). A wide
common mode range of -7V to +12V allows for
large ground potential differences between
systems. The receivers of the SP481, SP483
and SP485 have a tri-state enable control pin.
A logic LOW on RE (pin 4) will enable the
receiver, alogicHIGHonRE(pin4)willdisable
the receiver.
The RS-485 standard is ideal for multi-drop
applications and for long-distance interfaces.
RS-485 allows up to 32 drivers and 32 receivers
to be connected to a data bus, making it an ideal
choice for multi-drop applications. Since the
cabling can be as long as 4,000 feet, RS-485
transceivers are equipped with a wide (-7V to
+12V) common mode range to accommodate
groundpotentialdifferences. BecauseRS-485is
a differential interface, data is virtually immune
to noise in the transmission line.
The receiver for the SP481 and SP485 will
operateuptoatleast5Mbps. TheSP483receiver
isratedfordataratesupto250kbps. Thereceiver
foreachofthe threedevicesisequippedwiththe
fail-safe feature. Fail-safe guarantees that the
receiver output will be in a HIGH state when the
input is left unconnected and floating.
Drivers
SP481, SP483, SP485
Shutdown Mode
SP481/SP483
The driver outputs of the SP481, SP483, and
SP485 are differential outputs meeting the RS-
485 and RS-422 standards. The typical voltage
output swing with no load will be 0 volts to +5
volts. With worst case loading of 54Ω across the
differential outputs, the drivers can maintain
greater than 1.5V voltage levels. The drivers of
the SP481, SP483 and SP485 have an enable
control line which is active HIGH. A logic
HIGH on DE (pin 5) will enable the differential
driver outputs. A logic LOW on DE (pin 5) will
tri-state the driver outputs.
The SP481 and SP483 are equipped with a
Shutdown mode. To enable the Shutdown state,
both the driver and receiver must be disabled
simultaneously. AlogicLOWonDE(pin5)and
a logic HIGH on RE (pin 4) will put the SP481
or SP483 into Shutdown mode. In Shutdown,
supply current will drop to typically 1µA.
The transmitters of the SP481 and SP485 will
operate up to at least 5Mbps. The SP483 has
internally slew rate limited driver outputs to
minimize EMI. The maximum data rate for the
SP483 driver is 250kbps.
Rev. 07/28/04
SP481/483/485 Low Power Half-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
5
A
Test Point
CRL
1K
Receiver
Output
R
R
VCC
S1
S2
VOD
1K
VOC
B
Figure 1. Driver DC Test Load Circuit
Figure 2. Receiver Timing Test Load Circuit
3V
DE
DI
CL1
RDIFF
VCC
A
B
A
B
500
RO
15pF
S1
S2
Output
Under
Test
CL
CL2
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load #2 Circuit
f
SP481/485 = 1MHz; fSP483 = 100kHz ; tR < 10ns; tF < 10ns
+3V
0V
B
1.5V
1.5V
DI
tPLH
tPHL
1/2VO
1/2VO
DRIVER
OUTPUT
VO
A
tDPLH
tDPHL
+
DIFFERRENNTIAAL
OUTPUT
VO
0V
–
VO
VA – VB
tR
tF
tSKEW = tDPLH - tDPHL
|
|
Figure 6. Driver Propagation Delays
INPUTS
LINE
RE DE DI CONDITION
OUTPUTS
INPUTS
OUTPUTS
RE
DE
0
A - B
+0.2V
R
1
B
0
A
1
0
0
0
1
X
X
X
X
1
1
0
1
1
0
No Fault
No Fault
X
0
-0.2V
0
1
0
0
Inputs Open
X
1
X
X
Z
Z
Z
Z
0
Z
Fault
Table 2. Receive Function Truth Table
Table 1. Transmit Function Truth Table
Rev. 07/28/04
SP481/483/485 Low Power Half-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
6
fSP481/485 = 1MHz; fSP483 = 100kHz; tR < 10ns; tF < 10ns
+3V
0V
1.5V
1.5V
DE
A, B
A, B
tZL
2.3V
tLZ
5V
Output normally LOW
Output normally HIGH
0.5V
0.5V
VOL
VOH
2.3V
tZH
0V
tHZ
Figure 7. Driver Enable and Disable Times
+
–
V0D2
0V
0V
A – B
R
INPUT
V0D2
VOH
VOL
1.5V
1.5V
OUTPUT
tPHL
tPLH
fSP481/485 = 1MHz; fSP483 = 100kHz; tR < 10ns; tF < 10ns
tSKEW = tPHL - tPLH
|
|
Figure 8. Receiver Propagation Delays
fSP481/485 = 1MHz; fSP483 = 100kHz; tR < 10ns; tF < 10ns
1.5V 1.5V
+3V
0V
RE
R
tZL
1.5V
tLZ
5V
Output normally LOW
Output normally HIGH
0.5V
0.5V
VIL
VIH
R
1.5V
tZH
0V
tHZ
Figure 9. Receiver Enable and Disable Times
Rev. 07/28/04
SP481/483/485 Low Power Half-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
7
PACKAGE: 8 PIN NSOIC
D
Ø
e
E/2
L2
E1
E1/2
E
Ø
Seating Plane
Ø1
L
L1
Gauge Plane
VIEW C
1
b
INDEX AREA
(D/2 X E1/2)
TOP VIEW
A1
A
Seating Plane
A2
SIDE VIEW
8 Pin NSOIC JEDEC MO-012 (AA) Variation
MIN
1.35
0.1
1.25
0.31
0.17
NOM
MAX
1.75
0.25
1.65
0.51
0.24
SYMBOL
A
A1
A2
b
-
B
B
-
-
-
-
SEE VIEW C
c
D
E
E1
e
L
4.90 BSC
6.00 BSC
3.90 BSC
1.27 BSC
-
0.4
1.27
b
L1
L2
ø
1.04 REF
0.25 BSC
-
0º
5º
8º
15º
ø1
-
c
Note: Dimensions in (mm)
BASE METAL
SECTION B-B
WITH PLATING
Rev. 07/28/04
SP481/483/485 Low Power Half-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
8
PACKAGE: 8 PIN PDIP
N
E
INDEX
AREA
E
E1
2
3
N/2
1
c
eA
A1
eB
D
A
e
A2
D1
L
b
b2
b3
b
c
8 PIN PDIP JEDEC MS-001 (BA) Variation
SYMBOL
MIN
-
NOM
-
-
MAX
0.21
-
0.195
0.022
0.07
0.045
0.014
0.4
A
A1
A2
b
b2
b3
c
D
D1
E
E1
e
eA
eB
L
0.15
0.115
0.014
0.045
0.3
0.008
0.355
0.005
0.3
0.13
0.018
0.06
0.039
0.01
0.365
-
0.31
0.25
.100 BSC
.300 BSC
-
-
0.325
0.28
0.24
-
0.43
0.15
0.115
0.13
Note: Dimensions in (mm)
Rev. 07/28/04
SP481/483/485 Low Power Half-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
9
ORDERING INFORMATION
Model
Temperature Range
Package
SP481CN .............EOL, recommended upgrade SP481E............ 0˚C to +70˚C ............................................................................... 8-pin NSOIC
SP481CN/TR .......EOL, recommended upgrade SP481E............ 0˚C to +70˚C ............... ......................... ................................ 8-pin NSOIC
SP481CS .............EOL, recommended upgrade SP481E............ 0˚C to +70˚C ............................................................................. 8-pin PDIP
SP481EN .............EOL, recommended upgrade SP481E.......... .-40˚C to +85˚C ........................................................................... 8-pin NSOIC
SP481EN/TR ........EOL, recommended upgrade SP481E...........-40˚C to +85˚C .......................................................................... 8-pin NSOIC
SP481ES ..............EOL, recommended upgrade SP481E............ -40˚C to +85˚C ......................................................................... 8-pin PDIP
SP483CN ...................................................................................... 0˚C to +70˚C ............................................................................... 8-pin NSOIC
SP483CN/TR ................................................................................ 0˚C to +70˚C ............................................................................... 8-pin NSOIC
SP483CS ...................................................................................... 0˚C to +70˚C ................................................................................ 8-pin PDIP
SP483EN ..................................................................................... -40˚C to +85˚C ............................................................................. 8-pin NSOIC
SP483EN/TR ............................................................................... -40˚C to +85˚C ............................................................................. 8-pin NSOIC
SP483ES ..................................................................................... -40˚C to +85˚C .............................................................................. 8-pin PDIP
SP485CN ...................................................................................... 0˚C to +70˚C ............................................................................... 8-pin NSOIC
SP485CN/TR ................................................................................ 0˚C to +70˚C ............................................................................... 8-pin NSOIC
SP485CS ...................................................................................... 0˚C to +70˚C ................................................................................ 8-pin PDIP
SP485EN ..................................................................................... -40˚C to +85˚C ............................................................................. 8-pin NSOIC
SP485EN/TR ............................................................................... -40˚C to +85˚C ............................................................................. 8-pin NSOIC
SP485ES ..................................................................................... -40˚C to +85˚C .............................................................................. 8-pin PDIP
For lead-free packages, improved ESD protection and performance: upgrade to SP485E, SP481E, SP483E
Example: SP485EN/TR = upgrade to SP485EEN-L/TR
/TR = Tape and Reel
Pack quantity is 2,500 for NSOIC.
CLICK HERE TO ORDER SAMPLES
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
e-mail: sales@sipex.com
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
Rev. 07/28/04
SP481/483/485 Low Power Half-Duplex RS485 Transceivers
© Copyright 2002 Sipex Corporation
10
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SIPEX
SP481RCN
1/10th Unit Load RS-485 TransceiverWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SIPEX
SP481RCN-L
Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDSO8, LEAD FREE, MS-012AA, SOIC-8Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SIPEX
SP481RCN-L/TR
Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDSO8, LEAD FREE, MS-012AA, SOIC-8Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SP481RCN/TR
1/10th Unit Load RS-485 TransceiverWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SIPEX
SP481RCP
1/10th Unit Load RS-485 TransceiverWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SIPEX
SP481RCP-L
Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDIP8, LEAD FREE, PLASTIC, MS-001BA, DIP-8Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SIPEX
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