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(R)
SP490E/SP491E
Enhanced Full Duplex RS-485 Transceivers
+5V Only Low Power BiCMOS Driver/Receiver Enable (SP491E) RS-485 and RS-422 Drivers/Receivers Pin Compatible with LTC490 and SN75179 (SP490E) s Pin Compatible with LTC491 and SN75180 (SP491E) s Improved ESD Specifications: 15kV Human Body Model 15kV IEC1000-4-2 Air Discharge 8kV IEC1000-4-2 Contact Discharge DESCRIPTION... The SP490E is a low power differential line driver/receiver meeting RS-485 and RS-422 standards up to 10Mbps. The SP491E is identical to the SP490E with the addition of driver and receiver tri-state enable lines. Both products feature 200mV receiver input sensitivity, over wide common mode range. The SP490E is available in 8-pin plastic DIP and 8-pin NSOIC packages for operation over the commercial and industrial temperature ranges. The SP491E is available in 14-pin DIP and 14-pin NSOIC packages for operation over the commercial and industrial temperature ranges. s s s s s
NC 1
14 Vcc 13 NC 12 A
Vcc 1 R2
R2
8A
R
11 B
R
REB 3
7B
DE 4
6Z D3 GND 4
10 Z D5
D
5Y
D
GND 6 GND 7
9Y 8 NC
SP490E
SP491E
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
(c) Copyright 2000 Sipex Corporation
1
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
SPECIFICATIONS
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS SP490E DRIVER DC Characteristics Differential Output Voltage Differential Output Voltage Differential Output Voltage 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 SP490E DRIVER AC Characteristics Maximum Data Rate Driver Input to Output Driver Input to Output Driver Skew Driver Rise or Fall Time
MIN.
TYP.
MAX.
UNITS
CONDITIONS
GND 2 1.5
VCC VCC VCC 0.2 3
Volts Volts Volts Volts Volts Volts Volts A mA mA
Unloaded; R = ; see Figure 1 With Load; R = 50; (RS-422); see Figure 1 With Load; R = 27; (RS-485); see Figure 1 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
2.0 0.8 10 250 250
10 20 20
30 30 5
60 60
Mbps ns ns ns
3
15
40
ns
RDIFF = 54, CL1 = CL2 = 100pF tPLH; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 6 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 5 see Figures 3 and 5, tSKEW = | tDPLH - tDPHL| From 10% to 90%; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 5
SP490E RECEIVER DC Characteristics Differential Input Threshold -0.2 Input Hysteresis Output Voltage High 3.5 Output Voltage Low Input Resistance 12 Input Current (A, B); VIN = 12V Input Current (A, B); VIN = -7V Short-Circuit Current
+0.2 70 0.4 15 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 VIN = 12V VIN = -7V 0V VO VCC
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
(c) Copyright 2000 Sipex Corporation
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SPECIFICATIONS (continued)
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS SP490E RECEIVER AC Characteristics Maximum Data Rate Receiver Input to Output Receiver Input to Output Diff. Receiver Skew ItPLH-tPHLI POWER REQUIREMENTS Supply Voltage Supply Current ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) Industrial (_E_) Storage Temperature Package Plastic DIP (_P) NSOIC (_N)
MIN.
TYP.
MAX.
UNITS
CONDITIONS
10 20 20
45 45 13
100 100
Mbps ns ns ns
tPLH; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 RDIFF = 54; CL1 = CL2 = 100pF;
Figures 3 & 7
+4.75 900
+5.25
Volts A
0 -40 -65
+70 +85 +150
C C C
A R VOD R B VOC
S2 Receiver Output CRL Test Point S1 1k 1k VCC
Figure 1. Driver DC Test Load Circuit
Figure 2. Receiver Timing Test Load Circuit
3V DE DI A B CL2 RDIFF CL1 A RO B 15pF
Output Under Test
500 CL
S1
VCC
S2
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load #2 Circuit
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
(c) Copyright 2000 Sipex Corporation
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+3V DI 0V DRIVER OUTPUT Z Y
f = 1MHz; tR < 10ns; tF < 10ns 1.5V tPLH VO 1/2VO tDPLH tDPHL tPHL 1/2VO 1.5V
DIFFERENTIAL VO+ OUTPUT 0V VY - VZ VO- tSKEW = | tDPLH - tDPHL |
tR
tF
Figure 5. Driver Propagation Delays
+3V DE 0V 5V A, B Y, Z VOL VOH A, B Y, Z 0V
f = 1MHz; tR < 10ns; tF < 10ns 1.5V tZL 2.3V Output normally LOW 1.5V tLZ 0.5V 0.5V tHZ
2.3V tZH
Output normally HIGH
Figure 6. Driver Enable and Disable Times
f = 1MHz; tR < 10ns; tF < 10ns V0D2+ Y-Z V0D2- VOH R VOL tPHL 1.5V 0V INPUT 0V
OUTPUT tPLH
1.5V
tSKEW = | tPHL - tPLH |
Figure 7. Receiver Propagation Delays
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
(c) Copyright 2000 Sipex Corporation
4
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 Logic...................................................-0.5V to (VCC+0.5V) Drivers................................................-0.5V to (VCC+0.5V) Receivers..................................................................14V Output Voltages Logic...................................................-0.5V to (VCC+0.5V) Drivers......................................................................14V Receivers...........................................-0.5V to (VCC+0.5V) Storage Temperature......................................................-65C to +150 Power Dissipation.....................................................................1000mW
SPECIFICATIONS
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS SP491E DRIVER DC Characteristics Differential Output Voltage Differential Output Voltage Differential Output Voltage 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 SP491E DRIVER AC Characteristics 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 1.5
VCC VCC VCC 0.2 3
Volts Volts Volts Volts Volts Volts Volts A mA mA
Unloaded; R = ; see Figure 1 With Load; R = 50; (RS-422); see Figure 1 With Load; R = 27; (RS-485);see Figure 1 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 10V -7V VO 10V
2.0 0.8 10 250 250
10 20 20
30 30 5
60 60 10 40 70 70 70 70
Mbps ns ns ns ns ns ns ns ns
3
15 40 40 40 40
RDIFF = 54, CL1 = CL2 = 100pF tPLH; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 5 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 5 see Figures 3 and 5, tSKEW = | tDPLH - tDPHL | From 10% to 90%; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 5 CL1 = CL2 = 100pF; see Figures 4 and 6; S2 closed CL1 = CL2 = 100pF; see Figures 4 and 6; S1 closed CL1 = CL2 = 15pF; see Figures 4 and 6; S1 closed CL1 = CL2 = 15pF; see Figures 4 and 6; S2 closed
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
(c) Copyright 2000 Sipex Corporation
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SPECIFICATIONS (continued)
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS MIN. SP491E RECEIVER DC Characteristics 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 = 12V Input Current (A, B); VIN = -7V Short-Circuit Current SP491E RECEIVER AC Characteristics Maximum Data Rate 10 Receiver Input to Output 20 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 POWER REQUIREMENTS Supply Voltage +4.75 Supply Current SP491E ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) Industrial (_E_) Storage Temperature Package Plastic DIP (_P) NSOIC (_N) 20
TYP.
MAX.
UNITS
CONDITIONS
+0.2 70 0.4 1 15 1.0 -0.8 85
Volts mV Volts Volts A k mA mA mA
-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 = 12V DE = 0V, VCC = 0V or 5.25V, VIN = -7V 0V VO VCC
45 45 13 45 45 45 45
100 100
Mbps ns ns ns
REB = 0V, DE = 5V tPLH; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 RDIFF = 54; CL1 = CL2 = 100pF;
Figures 3 & 7
70 70 70 70 +5.25
ns ns ns ns Volts A
CRL = 15pF; Figures 2 and 8; S1 closed CRL = 15pF; Figures 2 and 8; S2 closed CRL = 15pF; Figures 2 and 8; S1 closed CRL = 15pF; Figures 2 and 8; S2 closed
900
REB, D = 0V or VCC; DE = VCC
0 -40 -65
+70 +85 +150
C C C
+3V RE 0V 5V R VIL VIH R 0V 1.5V tZH Output normally HIGH 1.5V Output normally LOW 0.5V 0.5V tHZ 1.5V f = 1MHz; t < 10ns; t < 10ns R F tZL 1.5V tLZ
Figure 8. Receiver Enable and Disable Times
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
(c) Copyright 2000 Sipex Corporation
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FEATURES The SP490E and SP491E 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. THEORY OF OPERATION 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. Drivers The drivers for both the SP490E and SP491E 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 SP491E has a driver enable control line which is active high. A logic high on DE (pin 4) of the SP491E will enable the differential driver outputs. A logic low on DE (pin 4) of the SP491E will tri-state the driver outputs. The SP490E does not have a driver enable.
RC C SW1
DC Power Source
Receivers The receivers for both the SP490E and SP491E 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 SP490E and SP491E 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 SP491E has a receiver enable control line which is active low. A logic low on REB (pin 3) of the SP491E will enable the differential receiver. A logic high on REB (pin 3) of the SP491E will tri-state the receiver. ESD Tolerance The SP490E/SP491E devices incorporate ruggedized ESD cells on all driver output and receiver input pins. The ESD structure is improved over our previous family for more rugged applications and environments sensitive to electro-static discharges and associated transients. The improved ESD tolerance is at least 15kV without damage nor latch-up.
RS S SW2 CS S
Device Under Test
Figure 9. ESD Test Circuit for Human Body Model
SP490EDS/14 SP490E Enhanced Full Duplex RS-485 Transceivers (c) Copyright 2000 Sipex Corporation
7
Contact-Discharge Module
RC RC SW1 SW1
DC Power Source
RS RS
RV SW2 SW2
CS CS
Device Under Test
RS and RV add up to 330 for IEC1000-4-2. 330 for
Figure 10. ESD Test Circuit for IEC1000-4-2
There are different methods of ESD testing applied: a) MIL-STD-883, Method 3015.7 b) IEC1000-4-2 Air-Discharge c) IEC1000-4-2 Direct Contact 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 test is to simulate the human body's potential 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 capability to withstand an ESD transient during normal handling such as in manufacturing areas where the ICs tend to be handled frequently. The IEC-1000-4-2, formerly IEC801-2, is generally used for testing ESD on equipment and systems. For system manufacturers, they must guarantee 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 circuit 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. With the Air Discharge Method, an ESD voltage is applied to the equipment under test (EUT) through air. This simulates an electrically charged
30A
15A
0A t=0ns t Figure 11. ESD Test Waveform for IEC1000-4-2 t=30ns
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
i
(c) Copyright 2000 Sipex Corporation
8
person ready to connect a cable onto the rear of the system only to find an unpleasant zap just before the person touches the back panel. The high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. This energy, whether discharged directly or through air, is predominantly a function of the discharge current rather than the discharge voltage. Variables with an air discharge such as approach speed of the object carrying the 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. The Contact Discharge Method applies the ESD current directly to the EUT. This method 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 situations 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.
The circuit models in Figures 9 and 10 represent the typical ESD testing circuits used for all three methods. The CS is initially charged 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. 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 duration of voltage. For the Human Body Model, the current limiting resistor (RS) and the source capacitor (CS) are 1.5k an 100pF, respectively. For IEC-1000-42, the current limiting resistor (RS) and the source capacitor (CS) are 330 an 150pF, respectively. The higher CS value and lower RS value in the IEC1000-4-2 model are more stringent 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.
SP490E/SP491E Family
Driver Outputs Receiver Inputs
HUMAN BODY MODEL
15kV 15kV
Air Discharge
15kV 15kV
IEC1000-4-2 Direct Contact
8kV 8kV
Level
4 4
Table 1. Transceiver ESD Tolerance Levels
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
(c) Copyright 2000 Sipex Corporation
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PACKAGE: PLASTIC DUAL-IN-LINE (NARROW)
E1 E
D1 = 0.005" min. (0.127 min.) D
A1 = 0.015" min. (0.381min.) A = 0.210" max. (5.334 max). A2 C O eA = 0.300 BSC (7.620 BSC) L
e = 0.100 BSC (2.540 BSC)
B1 B
ALTERNATE END PINS (BOTH ENDS)
DIMENSIONS (Inches) Minimum/Maximum (mm) A2 B B1 C D E E1 L O
8-PIN 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356)
14-PIN 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356)
16-PIN 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356)
18-PIN 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356)
20-PIN 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356)
22-PIN 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356)
0.355/0.400 0.735/0.775 0.780/0.800 0.880/0.920 0.980/1.060 1.145/1.155 (9.017/10.160) (18.669/19.685) (19.812/20.320) (22.352/23.368) (24.892/26.924) (29.083/29.337) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0/ 15 (0/15) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0/ 15 (0/15) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0/ 15 (0/15) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0/ 15 (0/15) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0/ 15 (0/15) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0/ 15 (0/15)
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
(c) Copyright 2000 Sipex Corporation
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PACKAGE: PLASTIC SMALL OUTLINE (SOIC) (NARROW)
E
H
h x 45 D A O e B A1 L
DIMENSIONS (Inches) Minimum/Maximum (mm) A A1 B D E e H h L O
8-PIN 0.053/0.069 (1.346/1.748) 0.004/0.010 (0.102/0.249 0.014/0.019 (0.35/0.49) 0.189/0.197 (4.80/5.00) 0.150/0.157 (3.802/3.988) 0.050 BSC (1.270 BSC) 0.228/0.244 (5.801/6.198) 0.010/0.020 (0.254/0.498) 0.016/0.050 (0.406/1.270) 0/8 (0/8)
14-PIN 0.053/0.069 (1.346/1.748) 0.004/0.010 (0.102/0.249) 0.013/0.020 (0.330/0.508)
16-PIN 0.053/0.069 (1.346/1.748) 0.004/0.010 (0.102/0.249) 0.013/0.020 (0.330/0.508)
0.337/0.344 0.386/0.394 (8.552/8.748) (9.802/10.000) 0.150/0.157 (3.802/3.988) 0.050 BSC (1.270 BSC) 0.228/0.244 (5.801/6.198) 0.010/0.020 (0.254/0.498) 0.016/0.050 (0.406/1.270) 0/8 (0/8) 0.150/0.157 (3.802/3.988) 0.050 BSC (1.270 BSC) 0.228/0.244 (5.801/6.198) 0.010/0.020 (0.254/0.498) 0.016/0.050 (0.406/1.270) 0/8 (0/8)
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
(c) Copyright 2000 Sipex Corporation
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ORDERING INFORMATION
Model Temperature Range Package SP490ECN. ...................................................... 0C to +70C ..................................................... 8-Pin NSOIC SP490ECP ........................................................ 0C to +70C ........................................................... 8-Pin DIP SP490EEN. ..................................................... -40C to +85C ................................................... 8-Pin NSOIC SP490EEP ...................................................... -40C to +85C ......................................................... 8-Pin DIP SP491ECN ....................................................... 0C to +70C ................................................... 14-Pin NSOIC SP491ECP ........................................................ 0C to +70C ......................................................... 14-Pin DIP SP491EEN. ..................................................... -40C to +85C ................................................. 14-Pin NSOIC SP491EEP ...................................................... -40C to +85C ....................................................... 14-Pin DIP
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
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.
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
(c) Copyright 2000 Sipex Corporation
12

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