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SP490/SP491 Full Duplex RS-485 Transceivers
+5V Only Low Power BiCMOS Driver/Receiver Enable (SP491) RS-485 and RS-422 Drivers/Receivers Pin Compatible with LTC490 and SN75179 (SP490) Pin Compatible with LTC491 and SN75180 (SP491)

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 14-pin DIP and 14-pin NSOIC packages for operation over the commercial and industrial temperature ranges. BLOCK DIAGRAMS
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
SP490
SP491
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
(c) Copyright 2004 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
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS SP490 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 SP490 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; (RS422); see figure 1 With Load; R = 27; (RS485); 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 35 35 250 250
5 30 30 5 15 40 60 60
Mbps ns ns ns ns
tPLH; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 6 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 6 see figures 3 and 6, tSKEW = | tDPLH - tDPHL | From 10% to 90%; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 6
SP490 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 70 3.5
+0.2 0.4
12
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
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
(c) Copyright 2004 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS SP490 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 (_S_) NSOIC (_N)
MIN.
TYP.
MAX.
UNITS
CONDITIONS
5 90 90 13 150 150
Mbps ns ns ns
tPLH; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 8 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 8 RDIFF = 54; CL1 = CL2 = 100pF;
Figures 3 & 8
+4.75 900
+5.25
Volts A
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
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
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
(c) Copyright 2004 Sipex Corporation
3
+3V DI 0V DRIVER OUTPUT B A
f = 1MHz; tR < 10ns; tF < 10ns 1.5V tPLH VO 1/2VO tDPLH tDPHL tPHL 1/2VO 1.5V
DIFFERENTIAL VO+ OUTPUT 0V V A - V B V O- tSKEW = | tDPLH - tDPHL |
Figure 6. Driver Propagation Delays
tR
tF
+3V DE 0V 5V A, B VOL VOH A, B 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 7. Driver Enable and Disable Times
V0D2+ A-B V0D2- VOH R VOL tPHL
0V
INPUT
0V
1.5V
OUTPUT
1.5V
tPLH f = 1MHz; tR < 10ns; tF < 10ns
tSKEW = | tPHL - tPLH |
Figure 8. Receiver Propagation Delays
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
(c) Copyright 2004 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
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS SP491 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 SP491 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; (RS422); see figure 1 With Load; R = 27; (RS485); 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 12V -7V VO 12V
2.0 0.8 10 35 35 250 250
5 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
REB = 5V, DE = 5V tPLH; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 6 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 6 see figures 3 and 6, tSKEW = | tDPLH - tDPHL | From 10% to 90%; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 6 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
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
(c) Copyright 2004 Sipex Corporation
5
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS MIN. SP491 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 7 SP491 RECEIVER DC Characteristics Maximum Data Rate 5 Receiver Input to Output 60 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 SP491 ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) Industrial (_E_) Storage Temperature Package Plastic DIP (_S_) NSOIC (_N) 60
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
90 90 13 20 20 20 20
150 150
Mbps ns ns ns
REB = 0V tPLH; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 8 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 8 RDIFF = 54; CL1 = CL2 = 100pF;
Figures 3 & 8
50 50 50 50 +5.25
ns ns ns ns Volts A
CRL = 15pF; Figures 2 and 9; S1 closed CRL = 15pF; Figures 2 and 9; S2 closed CRL = 15pF; Figures 2 and 9; S1 closed CRL = 15pF; Figures 2 and 9; S2 closed
600
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 9. Receiver Enable and Disable Times
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
(c) Copyright 2004 Sipex Corporation
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 +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 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 1.5V 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 +12V 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.
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
(c) Copyright 2004 Sipex Corporation
7
PACKAGE: 8 PIN NSOIC
D e
E/2 E1 E E1/2
SEE VIEW C
1 INDEX AREA (D/2 X E1/2) b
O1
TOP VIEW
L2 Seating Plane
O1
Gauge Plane
O
L L1
A
A2 SEATING PLANE A1
VIEW C
SIDE VIEW
8 Pin NSOIC
(JEDEC MS-012, AA - VARIATION)
DIMENSIONS Minimum/Maximum (mm)
WITH PLATING
b
COMMON HEIGHT DIMENSION
SYMBOL A A1 A2 b c D E E1 e L L1 L2 O O1
MIN NOM MAX 1.75 1.35 0.25 0.10 1.25 1.65 0.31 0.51 0.17 0.25 4.90 BSC 6.00 BSC 3.90 BSC 1.27 BSC 0.40 1.27 1.04 REF 0.25 BSC 0 8 5 15
c
BASE METAL
CONTACT AREA
8 PIN NSOIC
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
(c) Copyright 2004 Sipex Corporation
8
PACKAGE: 8 PIN NSOIC
D e
E/2 E1 E E1/2
SEE VIEW C
1 INDEX AREA (D/2 X E1/2) B b
O1
TOP VIEW
Gauge Plane L2 Seating Plane
O1
L L1
O
VIEW C
A A2
A1
SIDE VIEW
b
14 Pin NSOIC
(JEDEC MS-012, AB - VARIATION)
DIMENSIONS Minimum/Maximum (mm)
WITH PLATING
COMMON HEIGHT DIMENSION
SYMBOL A A1 A2 b c D E E1 e L L1 L2 O O1
MIN NOM MAX - 1.75 1.35 0.25 0.10 1.25 1.65 0.31 0.51 - 0.25 0.17 8.65 BSC 6.00 BSC 3.90 BSC 1.27 BSC 0.40 1.27 1.04 REF 0.25 BSC 0 8 5 - 15
c
BASE METAL
CONTACT AREA
14 PIN NSOIC
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
(c) Copyright 2004 Sipex Corporation
9
PACKAGE: 8 PIN NSOIC
A1 D A N D1 b3 e b2 b L A2
INDEX AREA
E1 E
123
N/2
8 PIN PDIP JEDEC MS-001 (BA) Variation A A1 A2 b b2 b3 c D D1 E E1 e eA eB L
Dimensions in inches MIN .015 .115 .014 .045 .030 .008 .355 .005 .300 .240 NOM MAX .130 .018 .060 .039 .010 .365 .310 .250 .100 BSC .300 BSC .115 .130 .430 .150 .210 .195 .022 .070 .045 .014 .400 .325 .280
E
c eA eB
b
C
8 pin PDIP
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
(c) Copyright 2004 Sipex Corporation
10
PACKAGE: 8 PIN NSOIC
A1 D A N D1 b3 e b2 b L A2
INDEX AREA
E1 E
123
N/2
14 PIN PDIP JEDEC MS-001 (AA) Variation A A1 A2 b b2 b3 c D D1 E E1 e eA eB L
Dimensions in inches MIN .015 .115 .014 .045 .030 .008 .735 .005 .300 .240 NOM MAX .130 .018 .060 .039 .010 .750 .310 .250 .100 BSC .300 BSC .115 .130 .430 .150 .210 .195 .022 .070 .045 .014 .775 .325 .280
E
c eA eB
b
C
14 pin PDIP
Date: 05/10/04
SP490/491 Full Duplex RS-485 Transceivers
(c) Copyright 2004 Sipex Corporation
11
ORDERING INFORMATION
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 SP491CN ...................................................................................... 0C to +70C .............................................................................. 14-Pin NSOIC SP491CN/TR ................................................................................ 0C to +70C .............................................................................. 14-Pin NSOIC SP491CS ...................................................................................... 0C to +70C ............................................................................... 14-Pin PDIP SP491EN ..................................................................................... -40C to +85C ............................................................................ 14-Pin NSOIC SP491EN/TR ............................................................................... -40C to +85C ............................................................................ 14-Pin NSOIC SP491ES ..................................................................................... -40C to +85C ............................................................................. 14-Pin PDIP
/TR = Tape and Reel Pack quantity is 2500 for NSOIC.
Please consult factory for pricing and availability of various package and temperature options or price and availability of tapeon-reel.
Corporation
ANALOG EXCELLENCE
Sipex Corporation Headquarters and 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. Date: 05/10/04 SP490/491 Full Duplex RS-485 Transceivers (c) Copyright 2004 Sipex Corporation
12

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