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SP490andSP491 FullDuplexRS-485Transceivers
FEATURES * +5V Only * Low Power BiCMOS * Driver/Receiver Enable (SP49) * RS-485 and RS-422 Drivers/Receivers * Pin Compatible with LTC490 and SN7579 (SP490) * Pin Compatible with LTC49 and SN7580 (SP49) Now Available in Lead Free Packaging
DESCRIPTION The SP490 is a low power differential line driver/receiver meeting RS-485 and RS-422 standards up to 5Mbps. The SP491 is identical to the SP490 with the addition of driver and receiver tri-state enable lines. Both products feature 200mV receiver input sensitivity, over wide common mode range. The SP490 is available in 8-pin plastic DIP and 8-pin NSOIC packages for operation over the commercial and industrial temperature ranges. The SP491 is available in 4-pin DIP and 4-pin NSOIC packages for operation over the commercial and industrial temperature ranges. BLOCKDIAGRAMS
SP490

SP491
SP490,49_00_07408
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com
ABSOLUTEMAXIMUMRATINGS
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. VCC....................................................................................................+7V Input Voltages Drivers................................................-0.5V to (VCC+0.5V) Receivers..................................................................4V Output Voltages Drivers......................................................................4V Receivers...........................................-0.5V to (VCC+0.5V) Storage Temperature....................................................-65C to +150 Power Dissipation.....................................................................000mW
ELECTRICALCHARACTERISTICS
TMINtoTMAXandVCC=5V5%unlessotherwisenoted.
PARAMETERSMIN.TYP. MAX.UNITS CONDITIONS SP490DRIVER DCCharacteristics Differential Output Voltage GND VCC Volts Unloaded; R = ; see figure 1 Differential Output Voltage 2 VCC Volts With Load; R = 50; (RS422); see figure 1 Differential Output Voltage .5 VCC Volts With Load; R = 27; (RS485); see figure 1 Change in Magnitude of Driver Differential Output Voltage for Complimentary States 0.2 Volts R = 27 or R = 50; see figure 1 Driver Common-Mode Output Voltage 3 Volts R = 27 or R = 50; see figure 1 Input High Voltage 2.0 Volts Applies to D Input Low Voltage 0.8 Volts Applies to D Input Current 0 A Applies to D Driver Short-Circuit Current VOUT = HIGH 35 250 mA -7V VO +12V VOUT = LOW 35 250 mA -7V VO +12V SP490DRIVER ACCharacteristics Maximum Data Rate Driver Input to Output Driver Input to Output Driver Skew Driver Rise or Fall Time SP490RECEIVER DCCharacteristics Differential Input Threshold Input Hysteresis Output Voltage High Output Voltage Low Input Resistance Input Current (A, B); VIN = 2V Input Current (A, B); VIN = -7V Short-Circuit Current 0.2 3.5 12 +0.2 0.4 .0 -0.8 85 Volts mV Volts Volts k mA mA mA -7V VCM 12V VCM = 0V IO = -4mA, VID = +200mV IO = +4mA, VID = -200mV -7V VCM 12V VIN = 2V VIN = -7V 0V VO VCC 5 Mbps ns ns ns 40 ns
30 30 5 5
60 60
tPLH; RDIFF = 54, CL = CL2 = 00pF; see figures 3 and 6 tPHL; RDIFF = 54, CL = CL2 = 00pF; see figures 3 and 6 see figures 3 and 6, tSKEW = | tDPLH - tDPHL | From 0% to 90%; RDIFF = 54, CL = CL2 = 00pF; see figures 3 and 6
70 15
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com
SP490,49_00_07408
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ELECTRICALCHARACTERISTICS
TMINtoTMAXandVCC=5V5%unlessotherwisenoted.
PARAMETERS SP490RECEIVER ACCharacteristics Maximum Data Rate Receiver Input to Output Receiver Input to Output Diff. Receiver Skew ItPLH-tPHLI
MIN.
TYP.
MAX. UNITS
CONDITIONS
5
90 90 3
50 50
Mbps ns ns ns
tPLH; RDIFF = 54, CL = CL2 = 00pF; Figures 3 & 8 tPHL; RDIFF = 54, CL = CL2 = 00pF; Figures 3 & 8 RDIFF = 54; CL = CL2 = 00pF;
Figures 3 & 8
POWERREQUIREMENTS Supply Voltage Supply Current ENVIRONMENTALAND MECHANICAL Operating Temperature Commercial (C_) Industrial (E_) Storage Temperature Package Plastic DIP (_S) NSOIC (_N)
+4.75
900
+5.25
Volts A
0 -40 -65
+70 +85 +50
C C C
Figure . Driver DC Test Load Circuit
Figure 2. Receiver Timing Test Load Circuit
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load #2 Circuit
SP490,49_00_07408
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com
3
Figure 6. Driver Propagation Delays
Figure 7. Driver Enable and Disable Times
Figure 8. Receiver Propagation Delays
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com SP490,49_00_07408
4
ABSOLUTEMAXIMUMRATINGS
Thesearestressratingsonlyandfunctionaloperationofthedevice attheseratingsoranyotherabovethoseindicatedintheoperation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCC...................................................................................................+7V InputVoltages Logic.................................................-0.5Vto(VCC+0.5V) Drivers..............................................-0.5Vto(VCC+0.5V) Receivers................................................................14V OutputVoltages Logic................................................-0.5Vto(VCC+0.5V) Drivers....................................................................14V Receivers.........................................-0.5Vto(VCC+0.5V) Storage Temperature.....................................................-65C to +150 Power Dissipation.................................................................1000mW
ELECTRICALCHARACTERISTICS
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS SP491DRIVER DCCharacteristics Differential Output Voltage Differential Output Voltage Differential Output Voltage figure 1 Change in Magnitude of Driver Differential Output Voltage for Complimentary States Driver Common-Mode Output Voltage Input High Voltage Input Low Voltage Input Current Driver Short-Circuit Current VOUT = HIGH VOUT = LOW SP491DRIVER ACCharacteristics Maximum Data Rate Driver Input to Output Driver Input to Output Driver Skew Driver Rise or Fall Time Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High
MIN.
TYP.
MAX. UNITS
CONDITIONS
GND 2 .5
VCC VCC VCC
Volts Volts Volts
Unloaded; R = ; see figure 1 With Load; R = 50; (RS422); see figure 1 With Load; R = 27; (RS485); see
0.2 2.0 3 0.8 0 250 250
Volts Volts Volts Volts A mA mA
R = 27 or R = 50; see figure 1 R = 27 or R = 50; see figure 1 Applies to D, REB, DE Applies to D, REB, DE Applies to D, REB, DE -7V VO 12V -7V VO 12V
35 35
5 20 20
30 30 5
60 60 0 40 70 70 70 70
Mbps ns ns ns ns ns ns ns ns
3
5 40 40 40 40
REB = 5V, DE = 5V tPLH; RDIFF = 54, CL = CL2 = 00pF; see figures 3 and 6 tPHL; RDIFF = 54, CL = CL2 = 00pF; see figures 3 and 6 see figures 3 and 6, tSKEW = | tDPLH - tDPHL | From 0% to 90%; RDIFF = 54, CL = CL2 = 00pF; see figures 3 and 6 CL = CL2 = 00pF; see figures 4 and 7; S2 closed CL = CL2 = 00pF; see figures 4 and 7; S closed CL = CL2 = 00pF; see figures 4 and 7; S closed CL = CL2 = 00pF; see figures 4 and 7; S2 closed
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com
SP490,49_00_07408
5
ELECTRICALCHARACTERISTICS
TMINtoTMAXandVCC=5V5%unlessotherwisenoted.
PARAMETERS MIN. SP491RECEIVER DCCharacteristics Differential Input Threshold -0.2 Input Hysteresis Output Voltage High 3.5 Output Voltage Low Three State (high impedance) Output Current Input Resistance 12 Input Current (A, B); VIN = 2V Input Current (A, B); VIN = -7V Short-Circuit Current 7 SP491RECEIVER ACCharacteristics Maximum Data Rate Receiver Input to Output Receiver Input to Output Diff. Receiver Skew ItPLH-tPHLI Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable from Low Receiver Disable from High POWERREQUIREMENTS Supply Voltage Supply Current SP491ENVIRONMENTAL ANDMECHANICAL Operating Temperature Commercial (C_) Industrial (E_) Storage Temperature Package Plastic DIP (_S) NSOIC (_N) +4.75
TYP.
MAX. UNITS +0.2 0.4 Volts mV Volts Volts A k mA mA mA
CONDITIONS -7V VCM 12V VCM = 0V IO = -4mA, VID = +200mV IO = +4mA, VID = -200mV 0.4V VO 2.4V; REB = 5V -7V VCM 12V DE = 0V, VCC = 0V or 5.25V, VIN = 2V DE = 0V, VCC = 0V or 5.25V, VIN = -7V 0V VO VCC
70
15
1 .0 -0.8 85
5 60 60
90 90 3 20 20 20 20
50 50
Mbps ns ns ns
REB = 0V tPLH; RDIFF = 54, CL = CL2 = 00pF; Figures 3 & 8 tPHL; RDIFF = 54, CL = CL2 = 00pF; Figures 3 & 8 RDIFF = 54; CL = CL2 = 00pF; CRL = 5pF; Figures 2 and 9; S closed CRL = 5pF; Figures 2 and 9; S2 closed CRL = 5pF; Figures 2 and 9; S closed CRL = 5pF; Figures 2 and 9; S2 closed
Figures 3 & 8
50 50 50 50 +5.25
ns ns ns ns Volts A
600
REB, D = 0V or VCC; DE = VCC
0 -40 -65
+70 +85 +50
C C C
Figure 9. Receiver Enable and Disable Times
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com SP490,49_00_07408
6
DESCRIPTION The SP490 and SP491 are full-duplex differential transceivers that meet the requirements of RS-485 and RS-422. Fabricated with a Sipex proprietary BiCMOS process, both products require a fraction of the power of older bipolar designs. The RS-485 standard is ideal for multi-drop applications or 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 +2V) common mode range to accommodate ground potential differences. Because RS-485 is a differential interface, data is virtually immune to noise in the transmission line. Driver... The drivers for both the SP490 and SP491 have differential outputs. The typical voltage output swing with no load will be 0 volts to +5 volts. With worst case loading of 54 across the differential outputs, the driver can maintain greater than .5V voltage levels.
The driver of the SP491 has a driver enable control line which is active high. A logic high on DE (pin 4) of the SP491 will enable the differential driver outputs. A logic low on DE (pin 4) of the SP491 will tri-state the driver outputs. The SP490 does not have a driver enable. Receiver... The receivers for both the SP490 and SP491 have differential inputs with an input sensitivity as low as 200mV. Input impedance of the receivers is typically 15k (12k minimum). A wide common mode range of -7V to +2V allows for large ground potential differences between systems. The receivers for both the SP490 and SP491 are 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. The receiver of the SP491 has a receiver enable control line which is active low. A logic low on REB (pin 3) of the SP491 will enable the differential receiver. A logic high on REB (pin 3) of the SP491 will tri-state the receiver.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com
SP490,49_00_07408
7
PACKAGE:8PINNSOIC
D e O
E/2 E1/2 E1 L2 E Seating Plane O1 L1
1
L Gauge Plane
O
INDEX AREA (D/2 X E1/2)
b
VIEW C
T OP VIEW
A
A1 Seating Plane A2
SIDE VIEW
8 Pin NSOIC JEDEC MO-012 (AA) Variation SYMBOL MIN NOM MAX A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.24 D 4.90 BSC E 6.00 BSC E1 3.90 BSC e 1.27 BSC L 0.4 1.27 L1 1.04 REF L2 0.25 BSC o 0 8 o1 5 15 Note: Dimensions in (mm)
B B
SEE VIEW C
b
c
BASE MET AL
SECTION B-B WITH PLA TING
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com
SP490,49_00_07408
8
PACKAGE:14PINNSOIC
D O e
E/2 E1 E1/2 L2 E Seating Plane O1 L1 1 INDEX AREA (D/2 X E1/2) L Gauge Plane O
VIEW C
b
TOP VIEW
A
A1 Seating Plane A2
SIDE VIEW
14 Pin NSOIC JEDEC MO-012 (AB) Variation MIN NOM MAX SYMBOL A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.25 D 8.65 BSC E 6.00 BSC E1 3.90 BSC e 1.27 BSC L 0.4 1.27 L1 1.04 REF L2 0.25 BSC o 0 8 o1 5 15 Note: Dimensions in (mm)
B B
SEE VIEW C
b
c
BASE MET AL
SECTION B-B WITH PLA TING
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com
SP490,49_00_07408
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PACKAGE:8PINPDIP
N INDEX AREA E
E1
E
1
2
3
N/2 c eA A1 eB
D A e D1 L b3 b2 b
A2
b
c
8 PIN PDIP JEDEC MS-001 (BA) Variation SYMBOL MIN NOM MAX A 0.21 A1 0.15 A2 0.115 0.13 0.195 b 0.014 0.018 0.022 b2 0.045 0.06 0.07 b3 0.3 0.039 0.045 c 0.008 0.01 0.014 D 0.355 0.365 0.4 D1 0.005 E 0.3 0.31 0.325 E1 0.24 0.25 0.28 e .100 BSC eA .300 BSC eB 0.43 L 0.115 0.13 0.15 Note: Dimensions in (mm)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com
SP490,49_00_07408
0
PACKAGE:14PINPDIP
N
INDEX AREA
E
E1 E
1
2
3
N/2
A1 D A
c eA eB
D1 b3
e L b2 b
A2
14 PIN PDIP JEDEC MS-001 (AA) Variation SYMBOL MIN NOM MAX A 0.21 A1 0.15 A2 0.115 0.13 0.195 b 0.014 0.018 0.022 b2 0.045 0.06 0.07 b3 0.3 0.039 0.045 c 0.008 0.01 0.014 D 0.735 0.75 0.755 D1 0.005 E 0.3 0.31 0.325 E1 0.24 0.25 0.28 e .100 BSC eA .300 BSC eB 0.43 L 0.115 0.13 0.15 Note: Dimensions in (mm)
b
c
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com
SP490,49_00_07408
ORDERINGINFORMATION
Model Temperature Range Package SP490CN. ...................................................................................... 0C to +70C ............................................................................... 8-Pin NSOIC SP490CN/TR ................................................................................. 0C to +70C ............................................................................... 8-Pin NSOIC SP490CS ....................................................................................... 0C to +70C .................................................................................8-Pin PDIP SP490EN ..................................................................................... -40C to +85C .............................................................................. 8-Pin NSOIC SP490EN/TR................................................................................ -40C to +85C .............................................................................. 8-Pin NSOIC SP490ES...................................................................................... -40C to +85C ................................................................................ 8-Pin PDIP SP49CN ....................................................................................... 0C to +70C .............................................................................. 4-Pin NSOIC SP49CN/TR ................................................................................. 0C to +70C .............................................................................. 4-Pin NSOIC SP49CS ....................................................................................... 0C to +70C ................................................................................4-Pin PDIP SP49EN ..................................................................................... -40C to +85C ............................................................................. 4-Pin NSOIC SP49EN/TR................................................................................ -40C to +85C ............................................................................. 4-Pin NSOIC SP49ES...................................................................................... -40C to +85C ............................................................................... 4-Pin PDIP
Available in lead free packaging. To order add "-L" suffix to part number. Example: SP49CN/TR = standard; SP49CN-L/TR = lead free /TR = Tape and Reel Pack quantity is 2500 for NSOIC.
REVISION HISTORY
Date 02/24/05 07/4/08 Revision .0.0 Description Sipex Legacy Data Sheet Convert to Exar format.
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 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 June 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.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-707 * www.exar.com
SP490,49_00_07408
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