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SP1490E/SP1491E Full Duplex RS-485 Transceivers
fEaturES
+5V Only Low Power BiCMOS Driver/Receiver Enable (SP1491E) RS-485 and RS-422 Drivers/Receivers Pin Compatible with SN75179 (SP1490E) Pin Compatible with SN75180 (SP1491E) Improved ESD Specifications 15kV Human Body Model 15kV IEC1000-4-2 Air Discharge 8kV IEC1000-4-2 Contact Discharge
VCC 1 RO 2 DI 3 GND 4
8A 7B 6Z 5Y
SP1490E
8 Pin -nSOIC 8 Pin nSOIC
aPPLicationS Industial Networks Motor Control
Telecom
HVAC/ Building Control
dEScriPtion
The SP1490E is a low power differential line driver/receiver meeting RS-485 and RS-422 standards up to 20Mbps. The SP1491E is identical to the SP1490E with the addition of driver and receiver tristate enable lines. Both products feature 200mV receiver input sensitivity, over wide common mode range. The SP1490E is available in an 8-pin NSOIC packages for operation over the commercial and industrial temperature ranges. The SP1491E is available in a 14-pin NSOIC packages for operation over the commercial and industrial temperature ranges.
BLocK diaGraM
Vcc 1 RO 2 NC 1 8A RO 2 RE B 3 DE 4 DI 5 GND 6 GND 7 14 Vcc 13 NC 12 A
R
7B 6Z
R
11 B
DI 3 GND 4
D
5Y
10 Z
D
9Y 8 NC
SP1490E
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1491E
SP1490_SP1491E_100_061209
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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. VCC...................................................................................................+7V Input Voltages Drivers................................................-0.5V to (VCC+0.5V) Receivers..................................................................14V Output Voltages Drivers......................................................................14V Receivers...........................................-0.5V to (VCC+0.5V) Storage Temperature....................................................-65C to +150 Power Dissipation.....................................................................1000mW
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
ParaMEtErS SP1490E/1491E drivEr DC Characteristics 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 SP1490E/1491E drivEr ac characteristics Maximum Data Rate Driver Input to Output Driver Input to Output Driver Skew Driver Rise or Fall Time SP1491E only Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High
Min. 3.5 2 1.5
tYP.
MaX. VCC VCC VCC
unitS Volts Volts Volts
conditionS 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 10 250 250
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 Applies to D Applies to D -7V VO +12V -7V VO +12V
20
30 30
40 40 5
Mbps ns ns ns ns
8
20
tR/F; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 6 tR/F; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 6 see figures 3 and 6, tR/F = | tPLH - tPHL | From 10% to 90%; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 6 tR/F CL1 = CL2 = 100pF; see figures 4 and 7; S2 closed CL1 = CL2 = 100pF; see figures 4 and 7; S1 closed CL1 = CL2 = 100pF; see figures 4 and 7; S1 closed CL1 = CL2 = 100pF; see figures 4 and 7; S2 closed
20 40 40 40
70 70 70 70
ns ns ns ns
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1490_SP1491E_100_061209
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TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
SPEcificationS (continued)
SP1490E/1491E rEcEivEr dc characteristics Differential Input Threshold Input Hysteresis Output Voltage High Output Voltage Low Input Resistance Input Current (A, B); VIN = 12V Input Current (A, B); VIN = -7V Short-Circuit Current
0.2 3.5 12
70 15
+0.2 0.4 1.0 -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 (1 unit load) VIN = 12V VIN = -7V 0V VO VCC
ParaMEtErS SP1490E/1491E rEcEivEr ac characteristics Maximum Data Rate Receiver Input to Output Receiver Input to Output Diff. Receiver Skew ItPLH-tPHLI Receiver Tplh/Tphl PoWEr rEQuirEMEntS Supply Voltage Supply Current EnvironMEntaL and MEchanicaL Operating Temperature Commercial (_C_) Industrial (_E_) Storage Temperature
Min.
tYP.
MaX.
unitS
conditionS
20 20 20
45 45 5 40
50 50 10 70 +5.25
Mbps ns ns ns ns Volts A
tPLH; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 8 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 8 RDIFF = 54; CL1 = CL2 = 100pF;
+4.75
900
0 -40 -65
+70 +85 +150
C C C
A R VOD R B VOC
Receiver Output CRL
Test Point S1 1K S2
1K
VCC
Figure 1. Driver DC Test Load Circuit
3V DE DI A B RDIFF CL2 CL1
Figure 2. Receiver Timing Test Load Circuit
A B
RO 15pF
Output Under Test
500 CL
S1
VCC
S2
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load #2 Circuit
SP1490_SP1491E_100_061209
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
3
DI DRIVER OUTPUT
+3V 0V B A
f = 1MHz; tR < 10ns; tF < 10ns 1.5V tPLH VO 1/2VO tSKEW tPHL 1.5V tPLH 1/2VO tSKEW
DIFFERENTIAL VO+ OUTPUT 0V VA - VB VO-
tR
tF
Figure 6. Driver Propagation Delays
DE
+3V 0V 5V VOL VOH 0V
f = 1MHz; tR < 10ns; tF < 10ns 1.5V tZL 2.3V Output normally LOW Output normally HIGH 1.5V tLZ 0.5V 0.5V tHZ
A, B
A, B
2.3V tZH
Figure 7. Driver Enable and Disable Times SP1491E only
A-B
V0D2+ V0D2- VOH VOL tPHL
0V
f = 1MHz; tR 10ns; tF 10ns INPUT 1.5V
0V
R
OUTPUT
1.5V tPHL
Figure 8. Receiver Propagation Delays
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1490_SP1491E_100_061209
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dEtaiLEd dEScriPtion
The SP1490E and SP1491E are full-duplex differential transceivers that meet the requirements of RS-485 and RS-422. Fabricated with a Exar 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 +12V) 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 SP1490E and SP1491E 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 1.5V voltage levels. The driver of the SP1491E has a driver enable control line which is active high. A logic high on DE (pin 4) of the SP1491E will enable the differential driver outputs. A logic low on DE (pin 4) of the SP1491E will tri-state the driver outputs. The SP1490E does not have a driver enable. receiver... The receivers for both the SP1490E and SP1491E 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 +12V allows for large ground potential differences between systems. The receivers for both the SP1490E and SP1491E 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 and floating. The receiver of the SP1491E has a receiver enable control line which is active low. A logic low on REB (pin 3) of the SP1491E will enable the differential receiver. A logic high on REB (pin 3) of the SP1491E will tri-state the receiver.
INPUTS RE SP1491E only
OUTPUTS
INPUTS DE SP1491E only 1 1 0 DI 1 0 x
OUTPUTS Y 1 0 z Z 0 1 z
A-B +0.2V -0.2V open x
R 1 0 1 z
0 0 0 1
Recieve Function Truth Table Transmit Function Truth Table
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1490_SP1491E_100_061209
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PACkAgE: 8 PIn nSOIC
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1490_SP1491E_100_061209
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PACkAgE: 14 PIn nSOIC
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1490_SP1491E_100_061209
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ORDERIng InFORMATIOn
Part Number TopMark Temperature Range Package SP1490ECN-L................................................. 1490ECNYYWW...................................0C to +70C ................................................ 8-Pin NSOIC SP1490ECN-L/TR. .......................................... 1490ECNYYWW...................................0C to +70C ................................................ 8-Pin NSOIC SP1490EEN-L. .............................................. SP1490EENYYWW...............................-40C to +85C............................................... 8-Pin NSOIC SP1490EEN-L/TR. ........................................ SP1490EENYYWW...............................-40C to +85C............................................... 8-Pin NSOIC SP1491ECN-L.................................................SP1491ECNYYWW...............................0C to +70C ............................................... 14-Pin NSOIC SP1491ECN-L/TR. ..........................................SP1491ECNYYWW...............................0C to +70C ............................................... 14-Pin NSOIC SP1491EEN-L. .............................................. SP1491EENYYWW...............................-40C to +85C.............................................. 14-Pin NSOIC SP1491EEN-L/TR. ........................................ SP1491EENYYWW...............................-40C to +85C.............................................. 14-Pin NSOIC
/TR = Tape and Reel Pack quantity is 2500 for Narrow SOIC.
DATE 03/08/07 06/12/09
REVISION DESCRIPTION J 1.0.0 Legacy Sipex Datasheet Convert to Exar format, update ordering information and change revision to 1.0.0
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 2009 EXAR Corporation Datasheet June 2009 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 * 510-668-7017 * www.exar.com
SP1490_SP1491E_100_061209
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