SP485CT [EXAR]
Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, CMOS, PDSO8, SOIC-8;
| 型号： | SP485CT |
| 厂家： | 
EXAR CORPORATION |
| 描述： | Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, CMOS, PDSO8, SOIC-8 |
| 文件： | 总12页 (文件大小：592K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SP481E / SP485E
Enhanced Low Power Half-Duplex
RS-485 Transceivers
• +5V Only
• Low Power BiCMOS
• Driver / Receiver Enable for Multi-Drop
configurations
• Low Power Shutdown mode (SP481E)
• Enhanced ESD Specifications:
+/-ꢀ5kV Human Body Model
+/-15kV IEC1000-4-2 Air Discharge
+/-8kV IEC1000-4-2 Contact Discharge
• Available in RoHS Compliant, Lead Free
Packaging.
DESCRIPTION
The SP481E and SP485E are a family of half-duplex transceivers that meet the specifica-
tions of RS-485 and RS-422 serial protocols with enhanced ESD performance. The ESD
tolerance has been improved on these devices to over +ꢀ5kV for both Human Body Model
and IEC1000-4-2Air Discharge Method. These devices are pin-to-pin compatible with Exar's
SP481 and SP485 devices as well as popular industry standards. As with the original ver-
sions, the SP481E and SP485E feature Exar's BiCMOS design allowing low power opera-
tion without sacrificing performance. The SP481E and SP485E meet the requirements of
the RS-485 and RS-422 protocols up to 10Mbps under load. The SP481E is equipped with
a low power shutdown mode.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP48ꢀE,485E_ꢀ00_ꢀ2ꢀ808
ꢀ
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.
Output Voltages
Logic.........................-0.3V to (Vcc + 0.5V)
Drivers.............................................+/-15V
Receivers..................-0.3V to (Vcc + 0.5V)
Storage Temperature.......................-65˚C to +150˚C
Power Dissipation
8-pin NSOIC...................................................550mW
(derate 6.60mW/ºC above +70ºC)
8-pin PDIP....................................................ꢀ000mW
(derate ꢀꢀ.8mW/ºC above +70ºC)
VCC.......................................................................+7V
Input Voltages
Logic.........................-0.3V to (Vcc + 0.5V)
Drivers......................-0.3V to (Vcc + 0.5V)
Receivers.........................................+/-15V
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS CONDITIONS
SP481E/SP485E DRIVER
DC Characteristics
Differential Output Voltage
Differential Output Voltage
GND
2
Vcc
Vcc
Volts
Volts
Unloaded; R = ∞ ; see Figure 1
With Load; R = 50Ω (RS-422); see
Figure 1
Differential Output Voltage
ꢀ.5
2.0
Vcc
0.2
Volts
Volts
With Load; R = 27Ω (RS-485); see
Figure 1
Change in Magnitude of Driver
Differential Output Voltage for
Complimentary states
R = 27Ω or R = 50Ω; see Figure 1
Driver Common Mode Output
Voltage
3
Volts
R = 27Ω or R = 50Ω; see Figure 1
Input High Voltage
Input Low Voltage
Input Current
Volts
Volts
µA
Applies to DE, DI, RE
Applies to DE, DI, RE
Applies to DE, DI, RE
0.8
+/-ꢀ0
Driver Short Circuit Current
VOUT = HIGH
+/-250
+/-250
mA
mA
-7V ≤ VO ≤ +12V
-7V ≤ VO ≤ +12V
VOUT = LOW
SP481E/SP485E DRIVER
AC Characteristics
Max. Transmission Rate
ꢀ0
Mbps
RE = 5V, DE = 5V; RDIFF = 54Ω,
CLꢀ = CL2 = ꢀ00pF
Driver Input to Output, tPLH
20
20
30
30
60
80
ns
ns
See Figures 3 & 5, RDIFF = 54Ω,
CLꢀ = CL2 = ꢀ00pF
Driver Input to Output, tPLH
(SP485EMN ONLY)
Driver Input to Output, tPHL
20
20
30
30
60
80
ns
ns
See Figures 3 & 5, RDIFF = 54Ω,
CLꢀ = CL2 = ꢀ00pF
Driver Input to Output, tPHL
(SP485EMN ONLY)
Driver Skew
5
ꢀ0
40
ns
ns
see Figures 3 and 5,
tSKEW = |tDPHL - tDPLH
|
Driver Rise or Fall Time
3
ꢀ5
From ꢀ0%-90%; RDIFF = 54Ω
CLꢀ = CL2 = 100pF; see Figures 3
and 6
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SP48ꢀE,485E_ꢀ00_ꢀ2ꢀ808
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ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS CONDITIONS
SP481E/SP485E DRIVER (continued)
AC Characteristics
Driver Enable to Output High
40
40
40
40
70
70
70
70
ns
ns
ns
ns
CL = 100pF, see Figures 4 and 6,
S2 closed
Driver Enable to Output Low
Driver Disable Time from High
Driver Disable Time from Low
CL = 100pF, see Figures 4 and 6,
Sꢀ closed
CL = 100pF, see Figures 4 and 6,
S2 closed
CL = 100pF, see Figures 4 and 6,
Sꢀ closed
SP481E/SP485E RECEIVER
DC Characteristics
Differential Input Threshold
-0.2
+0.2
+0.4
Volts -7V ≤ VCM ≤ +12V
Volts -7V ≤ VCM ≤ +12V
Differential Input Threshold
-0.4
(SP485EMN ONLY)
Input Hysteresis
20
ꢀ5
mV
VCM = 0V
Output Voltage High
Output Voltage Low
3.5
Volts IO = -4mA, VID = +200mV
Volts IO = +4mA, VID = +200mV
0.4
Three-State ( High Impedance)
Output Current
+/-ꢀ
µA
0.4V ≤ VO ≤ 2.4V; RE = 5V
Input Resistance
ꢀ2
kΩ
-7V ≤ VCM ≤ +12V
Input Current (A, B); VIN = ꢀ2V
+ꢀ.0
-0.8
95
mA
DE = 0V, VCC = 0V or 5.25V,
VIN = ꢀ2V
Input Current (A, B); VIN = -7V
mA
mA
DE = 0V, VCC = 0V or 5.25V,
VIN = -7V
Short Circuit Current
7
0V ≤ VO ≤ VCC
SP481E/SP485E RECEIVER
AC Characteristics
Max. Transmission Rate
Receiver Input to Output
ꢀ0
20
Mbps RE = 0V, DE = 0V
45
45
ꢀ3
45
45
45
45
ꢀ00
ꢀ00
ns
ns
ns
ns
ns
ns
ns
tPLH ; See Figures 3 & 7, RDIFF
54Ω, CLꢀ = CL2 = ꢀ00pF
=
=
Receiver Input to Output
Differential Receiver Skew
20
tPHL ; See Figures 3 & 7, RDIFF
54Ω, CLꢀ = CL2 = ꢀ00pF
RDIFF = 54Ω, CLꢀ = CL2 = 100pF, see
Figures 3 and 7
|tPHL - tPLH
|
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from LOW
Receiver Disable from High
70
70
70
70
CRL = 15pF, Figures 2 & 8; Sꢀ
Closed
CRL = 15pF, Figures 2 & 8; S2
Closed
CRL = 15pF, Figures 2 & 8; Sꢀ
Closed
CRL = 15pF, Figures 2 & 8; S2
Closed
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SP48ꢀE,485E_ꢀ00_ꢀ2ꢀ808
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ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted.
PARAMETERS
SP481E
MIN.
TYP.
MAX.
UNITS CONDITIONS
Shutdown Timing
Time to Shutdown
50
200
40
600
ꢀ00
ns
ns
RE = 5V, DE = 0V
Driver Enable from Shutdown
to Output High
CL = 100pF; See Figures 4 and 6;
S2 Closed
Driver Enable from Shutdown
to Output Low
40
ꢀ00
ꢀ000
ꢀ000
ns
ns
ns
CL = 100pF; See Figures 4 and 6;
Sꢀ Closed
Receiver Enable from
Shutdown to Output High
300
300
CL = 15pF; See Figures 2 and 8; S2
Closed
Receiver Enable from
CL = 15pF; See Figures 2 and 8; Sꢀ
Shutdown to Output Low
Closed
POWER REQUIREMENTS
Supply Voltage VCC
Supply Current
+4.75
+5.25
Volts
SP481E/SP485E
No Load
900
600
µA
µA
RE, DI = 0V or VCC; DE = VCC
RE = 0V, DI = 0V or 5V; DE = 0V
SP481E
Shutdown Mode
ꢀ0
µA
DE = 0V, RE = VCC
ENVIRONMENTAL AND MECHANICAL
Operating Temperature
Commercial (_C_)
Industrial (_E_)
(_M_)
0
70
ºC
ºC
ºC
ºC
-40
-40
-65
+85
+ꢀ25
+ꢀ50
Storage Temperature
Package
Plastic DIP (_P)
NSOIC (_N)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP48ꢀE,485E_ꢀ00_ꢀ2ꢀ808
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PIN FUNCTION
Pin ꢀ - RO - Receiver Output
Pin 2 - RE - Receiver Output Enable Active LOW
Pin 3 - DE - Driver Output Enable Active HIGH
Pin 4 DI - Driver Input
Pin 5 - GND - Ground Connection
Pin 6 - A - Driver Output / Receiver input
Non-Inverting
Pin 7 - B - Driver Output / Receiver Input Inverting
Pin 8 - Vcc - Positive Supply 4.75V ≤ Vcc ≤ 5.25V
TEST CIRCUITS
1kΩ
A
Test Point
1kΩ
Receiver
Output
V
CC
R
R
S
1
V
OD
C
RL
V
OC
S
2
B
Figure 1. RS-485 Driver DC Test Load Circuit
Figure 2. Receiver Timing Test Load Circuit
V
CC
CL1
S
1
A
A
500Ω
DI
RL
Output
Under
Test
RO
B
B
CL2
15pF
C
L
S
2
Figure 3. RS-485 Driver/Receiver Timing Test
Figure 4. Driver Timing Test Load #2 Circuit
f ≥1MHz; tR ≤10ns; tF ≤10ns
1.5V
+3V
1.5V
DRIVER INPUT
0V
tPLH
tPHL
B
1/2VO
1/2VO
DRIVER
OUTPUT
VO
A
tDPLH
tDPHL
+
VO
DIFFERENTIAL
OUTPUT
0V
–
VO
VA –VB
tF
tR
tSKEW= |tDPLH-tDPHL
|
Figure 5. Driver Propagation Delays
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP48ꢀE,485E_ꢀ00_ꢀ2ꢀ808
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FUNCTION TRUTH TABLES
INPUTS
OUTPUTS
INPUTS
OUTPUTS
LINE
RE
X
DE
ꢀ
DI
CONDITION
A
0
ꢀ
Z
Z
B
ꢀ
0
Z
Z
RE
0
DE
A - B
+0.2V
R
ꢀ
0
ꢀ
Z
ꢀ
0
No Fault
No Fault
X
0
0
0
0
X
ꢀ
0
-0.2V
X
0
X
X
0
Inputs Open
X
X
ꢀ
Fault
ꢀ
Table 2. Receive Function Truth Table
Table 1. Transmit Function Truth Table
SWITCHING WAVEFORMS
f = 1MHz; t < 10ns; t < 10ns
R
F
+3V
1.5V
1.5V
DE
A,B
A,B
0V
5V
t
t
LZ
ZL
2.3V
Output normally LOW
Output normally HIGH
0.5V
0.5V
V
OL
V
OH
2.3V
0V
t
t
HZ
ZH
Figure 6. Driver Enable and Disable Times
f = 1MHz; t
1.5V
; t
≤ 10ns
F
≤10ns
R
+
–
V
OD2
0V
0V
A – B
R
INPUT
V
OD2
V
OH
1.5V
OUTPUT
V
OL
t
t
PHL
PLH
Figure 7. Receiver Propagation Delays
+3V
1.5V
1.5V
RE
R
f = 1MHz; t ≤ 10ns; t ≤ 10ns
R
F
0V
5V
t
t
LZ
ZL
1.5V
Output normally LOW
Output normally HIGH
0.5V
0.5V
V
IL
V
IH
R
1.5V
0V
t
t
HZ
ZH
Figure 8. Receiver Enable and Disable Times
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DESCRIPTION
Receivers
The SP481E and SP485E are half-duplex
differentialtransceiversthatmeettherequire-
ments of RS-485 and RS-422. Fabricated
with an Exar proprietary BiCMOS process,
this product requires a fraction of the power
of older bipolar designs.
The SP481E and SP485E receivers have
differential inputs with an input sensitivity
as low as ±200mV. Input impedance of the
receiversistypically15kΩ(12kΩminimum).
Awide common mode range of -7V to +12V
allows for large ground potential differences
between systems. The receivers of the
SP481E and SP485E have a tri-state en-
able control pin. A logic LOW on RE (pin 2)
will enable the receiver, a logic HIGH on RE
(pin 2) will disable the receiver.
The RS-485 standard is ideal for multi-drop
applicationsandforlong-distanceinterfaces.
RS-485allowsupto32driversand32receiv-
ers 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-485transceiversareequippedwith
a wide (-7V to +12V) common mode range
to accommodate ground potential differ-
ences. Because RS-485 is a differential
interface, data is virtually immune to noise
in the transmission line.
The receiver for the SP481E and SP485E
will operate up to at least 10Mbps. The
receiver for each of the two devices is
equipped with the fail-safe feature. Fail-
safe guarantees that the receiver output
will be in a HIGH state when the input is
left unconnected.
Drivers
Shutdown Mode
SP481E
The driver outputs of the SP481E and
SP485E 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 volt-
age levels. The drivers of the SP481E and
SP485E have an enable control line which
is active HIGH. A logic HIGH on DE (pin 3)
will enable the differential driver outputs. A
logic LOW on the DE(pin 3) will tri-state the
driver outputs.
The SP481E is equipped with a Shutdown
mode. TO enable the shutdown state, both
driver and receiver must be disabled simul-
taneously. Alogic LOW on DE (pin 3) and a
LogicHIGHonRE(pin2)willputtheSP481E
into Shutdown mode. In Shutdown, supply
current will drop to typically ꢀµA.
ESD TOLERANCE
ThetransmittersoftheSP481EandSP485E
will operate up to at least 10Mbps.
The SP481E and SP485E incorporates
ruggedized ESD cells on all driver output
and receiver input pins. The ESD structure
is improved over our previous family for
moreruggedapplicationsandenvironments
sensitive to electro-static discharges and
associated transients. The improved ESD
tolerance is at least ±15kV without damage
or latch-up.
There are different methods of ESD testing
applied:
a) MIL-STD-883, Method 30ꢀ5.7
b) IEC1000-4-2 Air-Discharge
c) IECꢀ000-4-2 Direct Contact
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The Human Body Model has been the
generally accepted ESD testing method
for semiconductors. This method is also
specified in MIL-STD-883, Method 3015.7
for ESD testing. The premise of this ESD
testistosimulatethehumanbody’spotential
to store electro-static energy and discharge
it to an integrated circuit. The simulation is
performed by using a test model as shown
in Figure 9. This method will test the IC’s
capabilitytowithstandanESDtransientdur-
ing normal handling such as in manufactur-
ing areas where the ICs tend to be handled
frequently. The IEC-ꢀ000-4-2, formerly
IEC801-2, is generally used for testing ESD
on equipment and systems.
For system manufacturers, they must guar-
antee a certain amount of ESD protection
since the system itself is exposed to the
outside environment and human presence.
The premise with IEC1000-4-2 is that the
system is required to withstand an amount
of static electricity when ESD is applied to
points and surfaces of the equipment that
are accessible to personnel during normal
usage. The transceiver IC receives most
of the ESD current when the ESD source is
applied to the connector pins. The test cir-
cuit for IEC1000-4-2 is shown on Figure 10.
There are two methods within IEC1000-4-2,
the Air Discharge method and the Contact
Discharge method.
R
S
R
C
SW1
SW2
Device
Under
Test
C
DC Power
Source
S
Figure 9. ESD Test Circuit for Human Body Model
Contact-Discharge Model
R
R
R
C
S
V
SW1
SW2
Device
Under
Test
C
DC Power
Source
S
and
add up to 330Ω for IEC1000-4-2.
R
V
R
S
Figure 10. ESD Test Circuit for IEC1000-4-2
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8
With the Air Discharge Method, an ESD
voltage is applied to the equipment under
test (EUT) through air. This simulates an
electricallychargedpersonreadytoconnect
a cable onto the rear of the system only to
findanunpleasantzapjustbeforetheperson
touches the back panel. The high energy
potential on the person discharges through
anarcingpathtotherearpanelofthesystem
before he or she even touches the system.
This energy, whether discharged directly or
throughair,ispredominantlyafunctionofthe
discharge current rather than the discharge
voltage. Variableswithanairdischargesuch
asapproachspeedoftheobjectcarryingthe
ESD potential to the system and humidity
will tend to change the discharge current.
For example, the rise time of the discharge
current varies with the approach speed.
30A
15A
0A
t = 0ns
t = 30ns
t →
Figure 11. ESD Test Waveform for IEC1000-4-2
The voltage stored in the capacitor is then
applied through RS, the current limiting
resistor, onto the device under test (DUT).
In ESD tests, the SW2 switch is pulsed so
that the device under test receives a dura-
tion of voltage.
The Contact Discharge Method applies the
ESDcurrentdirectlytotheEUT. Thismethod
was devised to reduce the unpredictability
of the ESD arc. The discharge current rise
time is constant since the energy is directly
transferred without the air-gap arc. In situ-
ations such as hand held systems, the ESD
charge can be directly discharged to the
equipment from a person already holding
the equipment. The current is transferred
on to the keypad or the serial port of the
equipment directly and then travels through
the PCB and finally to the IC.
For the Human Body Model, the current
limitingresistor(RS)andthesourcecapacitor
(CS) are 1.5kΩ an 100pF, respectively. For
IEC-1000-4-2, the current limiting resistor
(R ) and the source capacitor (CS) are 330Ω
anS150pF, respectively.
The higher CS value and lower R value in
the IEC1000-4-2 model are moreSstringent
than the Human Body Model. The larger
storage capacitor injects a higher voltage
to the test point when SW2 is switched on.
The lower current limiting resistor increases
the current charge onto the test point.
The circuit model in Figures 9 and 10 repre-
sent the typical ESD testing circuit used for
allthreemethods. TheCS isinitiallycharged
with the DC power supply when the first
switch (SW1) is on. Now that the capacitor
is charged, the second switch (SW2) is on
while SW1 switches off.
SP48ꢀE, SP485E HUMAN BODY
IECꢀ000-4-2
FAMILY
MODEL
Air Discharge Direct Contact Level
Driver Outputs
Receiver Inputs
+/-ꢀ5kV
+/-ꢀ5kV
+/-ꢀ5kV
+/-ꢀ5kV
+/-8kV
+/-8kV
4
4
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SP48ꢀE,485E_ꢀ00_ꢀ2ꢀ808
9
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP48ꢀE,485E_ꢀ00_ꢀ2ꢀ808
ꢀ0
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP48ꢀE,485E_ꢀ00_ꢀ2ꢀ808
ꢀꢀ
ORDERING INFORMATION
Model
Temperature Range
Package Types
SP48ꢀECN-L.......................................................................0°C to +70°C................................................................................................8-pin NSOIC
SP48ꢀECN-L/TR................................................................. 0°C to +70°C................................................................................................8-pin NSOIC
SP48ꢀECP-L....................................................................... 0°C to +70°C................................................................................................8-pin PDIP
SP48ꢀEEN-L/.................................................................... -40°C to +85°C...............................................................................................8-pin NSOIC
SP48ꢀEEN-L/TR................................................................. -40°C to +85°C.............................................................................................8-pin NSOIC
SP48ꢀEEP-L....................................................................... -40°C to +85°C.............................................................................................8-pin PDIP
SP485ECN-L.......................................................................0°C to +70°C................................................................................................8-pin NSOIC
SP485ECN-L/TR................................................................. 0°C to +70°C................................................................................................8-pin NSOIC
SP485ECP-L....................................................................... 0°C to +70°C.................................................................................................8-pin PDIP
SP485EEN-L..................................................................... -40°C to +85°C................................................................................................8-pin NSOIC
SP485EEN-L/TR................................................................ -40°C to +85°C...............................................................................................8-pin NSOIC
SP485EEP-L...................................................................... -40°C to +85°C...............................................................................................8-pin PDIP
SP485EMN-L..................................................................... -40°C to +85°C...............................................................................................8-pin NSOIC
SP485EMN-L/TR............................................................... -40°C to +85°C...............................................................................................8-pin NSOIC
Note: /TR = Tape and Reel
REVISION HISTORY
DATE
REVISION DESCRIPTION
May ꢀꢀ/07
ꢀ2/ꢀ8/08
--
Legacy Sipex Datasheet
ꢀ.0.0
Convert to Exar Format. Update ordering information as a result of discontinued
Lead type package options per PDN 081126-01. Remove "Top Mark" information
from ordering page.
Notice
EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliabil-
ity. 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 writting, 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 2008 EXAR Corporation
Datasheet December 2008
Send your Interface technical inquiry with technical details to: uarttechsupport@exar.com
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
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SP48ꢀE,485E_ꢀ00_ꢀ2ꢀ808
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相关型号：
SP485ECN-L
Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDSO8, ROHS COMPLIANT, MS-012AA, SOIC-8
SIPEX
SP485ECN-L/TR
Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDSO8, ROHS COMPLIANT, MS-012AA, SOIC-8
SIPEX
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