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SP3490/SP3491
+3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
Full Duplex RS-485 and RS-422 Transceivers Operates from a single +3.3V supply Interoperable with +5.0V logic Driver/Receiver Tri-state Enable Lines (SP3491) -7V to +12V Common-Mode Input Voltage Range +200mV Receiver Input Sensitivity Allows up to 32 transceivers on the serial bus Compatibility with LTC490 and SN75179 (SP3490) Compatibility with LTC491 and SN75180 (SP3491) DESCRIPTION The SP3490 and the SP3491 are +3.3V low power full duplex transceivers that meet the specifications of the RS-485 and RS-422 serial protocols. These devices are pin-to-pin compatible with the Sipex SP490 and SP491 devices as well as popular industry standards. The SP3490 and the SP3491 feature Sipex's BiCMOS process, allowing low power operation without sacrificing performance. The SP3490 and SP3491 meet the electrical specifications of RS-485 and RS-422 serial protocols up to 10Mbps under load. The SP3491 is identical to the SP3490 with the addition of driver and receiver tri-state enable lines.
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
SP3490
SP3491
Rev. 10/11/02
SP3490/3491 Low Power Full-Duplex RS485 Transceivers
(c) Copyright 2002 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 ............................................................................................. +6.0V Input Voltages Drivers ............................................................... -0.3V to +6.0V Receivers ......................................................................... 14V Output Voltages Drivers .............................................................................. 14V Receivers .......................................................... -0.3V to +6.0V Storage Temperature ................................................... -65C to +150 Power Dissipation per Package 8-pin NSOIC (derate 6.90mW/oC above +70oC) ..................... 600mW 8-pin PDIP (derate 11.8mW/oC above +70oC) ...................... 1000mW 14-pin NSOIC (derate 8.33mW/oC above +70oC) ................... 700mW 14-pin PDIP (derate 14.3mW/oC above +70oC) .................... 1200mW
SPECIFICATIONS
TAMB = TMIN to TMAX and VCC = 3.3V 5% unless otherwise noted.
PARAMETERS SP3490 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 SP3490 DRIVER AC Characteristics Maximum Data Rate Driver Input to Output, tPLH Driver Input to Output, tPHL Differential 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 = ; Figure 1 With Load; R = 50; (RS-422); Figure 1 With Load; R = 27; (RS-485); Figure 1 R = 27 or R = 50; Figure 1 R = 27 or R = 50; Figure 1
2.0 0.8 +10 +250 +250
-7V < VO < +12V -7V < VO < +12V
10 20 20
40 40 2 5
60 60
Mbps ns ns ns
R=27, Figures 2 and 8 R=27, Figures 2 and 8 tPHL(Y) - tPLH(Y) , tPHL(Z) - tPLH(Z) , Figures 2 and 8 From 10% to 90%; Figures 3 and 9
20
ns
SP3490 RECEIVER DC Characteristics Differential Input Threshold 0.2 Input Hysteresis Output Voltage High VCC-0.4 Output Voltage Low Input Resistance 12 Input Current (A, B); VIN = 12V Input Current (A, B); VIN = -7V Short-Circuit Current
+0.2 25 0.4 15 1.0 -0.8 60
Volts mV Volts Volts k mA mA mA
-7V < VCM < 12V VCM = 0V IO = -1.5mA, VID = +200mV IO = +2.5mA, VID = -200mV -7V < VCM 12V VIN = 12V VIN = -7V 0V < VO < VCC
Rev. 10/11/02
SP3490/3491 Low Power Full-Duplex RS485 Transceivers
(c) Copyright 2002 Sipex Corporation
2
SPECIFICATIONS (continued)
TAMB = TMIN to TMAX and VCC = 3.3V 5% unless otherwise noted.
PARAMETERS SP3490 RECEIVER AC Characteristics Maximum Data Rate Receiver Input to Output, tPLH Receiver Input to Output, tPHL Differential Receiver Skew POWER REQUIREMENTS Supply Voltage Supply Current
MIN.
TYP.
MAX.
UNITS
CONDITIONS
10 40 40
70 70 4
120 85 120 85
Mbps ns ns ns ns ns
Figures 6 and 11 TAMB = 25oC, VCC = 3.3V, Figures 6 and 11 Figures 6 and 11 TAMB = 25oC, VCC = 3.3V, Figures 6 and 11
tPHL(A) - tPLH(A) , tPHL(B) - tPLH(B) , Figures 6 and 11
+3.0 1000 800
+3.6 2000 1500
Volts A DE = VCC DE = 0
VDM
R
S1
RL = 27
D VCC
VOD R VOC
GENERATOR (NOTE 1) 50
D
OUT CL = 15pF (NOTE 2)
VCC VOM = VOH + VOL 2
1.5V
Figure 1. Driver DC Test Load Circuit
Figure 2. Driver Propagation Delay Test Circuit
S1 D OUT CL = 50pF (NOTE 2) GENERATOR (NOTE 1)
CL = 15pF (NOTE 2)
CL D GENERATOR (NOTE 1) 50 VCC
RL = 60
OUT
RL = 110
50
VOM = VOH + VOL 2
1.5V
Figure 3. Driver Differential Output Delay and Transition Time Circuit
VCC RL = 110 S1 0V OR 3V D CL = 50pF (NOTE 2) GENERATOR (NOTE 1) 50 OUT
Figure 4. Driver Enable and Disable Timing Circuit, Output HIGH
OUT CL = 15pF (NOTE 2)
VID
GENERATOR (NOTE 1)
R
50
1.5V 0V VOM = VCC 2
Figure 5. Driver Enable and Disable Timing Circuit, Output LOW
Figure 6. Receiver Propagation Delay Test Circuit
Rev. 10/11/02
SP3490/3491 Low Power Full-Duplex RS485 Transceivers
(c) Copyright 2002 Sipex Corporation
3
3V INPUT 0V
1.5V -1.5V S3 1k VID R S2 S1 VCC
1.5V tPLH VOM VOL tPHL VOH
1.5V tPHL VOM
VOH Y OUTPUT
CL = 15pF (NOTE 2)
GENERATOR (NOTE 1)
50
tPLH VOM VOM
Z OUTPUT VOL
VOM = VOH + VOL 1.5V 2
Figure 7. Receiver Enable and Disable Timing Circuit
Figure 8. Driver Propagation Delay Waveforms
3V
3V IN 1.5V 1.5V 0V tDPLH tDPHL 2.0V 90% 50% 10% -2.0V tR tF
DE 0V VOH OUTPUT HIGH 0V VCC OUTPUT LOW VOL
1.5V tPZH VOM
1.5V tPHZ 0.25V
90% OUT 50% 10%
tPZL VOM
tPLZ 0.25V
VOM = VOH + VOL 1.5V 2
Figure 9. Driver Differential Output Delay and Transition Time Waveforms
Figure 10. Driver Enable and Disable Timing Waveforms
3V INPUT 0V tRPLH VCC OUTPUT 0V VOM = VCC 2 VOM VOM tRPHL 1.5V 1.5V
Figure 11. Receiver Propagation Delay Waveforms
Rev. 10/11/02
SP3490/3491 Low Power Full-Duplex RS485 Transceivers
(c) Copyright 2002 Sipex Corporation
4
SPECIFICATIONS
TAMB = TMIN to TMAX and VCC = +3.3V 5% unless otherwise noted.
PARAMETERS SP3491 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 SP3491 DRIVER AC Characteristics Maximum Data Rate Driver Input to Output, tPLH Driver Input to Output, tPHL Differential Driver Skew Driver Rise or Fall Time Driver Enable to Output HIGH Driver Enable to Output LOW Driver Disable from LOW Driver Disable 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 = ; Figure 1 With Load; R = 50; (RS-422); Figure 1 With Load; R = 27; (RS-485); Figure 1 R = 27 or R = 50; Figure 1 R = 27 or R = 50; 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 +250 +250
10 20 20
40 40 2 5 52 60 40 60
60 60
Mbps ns ns ns
Figures 2 and 8 Figures 2 and 8
tPHL(Y) - tPLH(Y) , tPHL(Z) - tPLH(Z) , Figures 2 and 8 From 10% to 90%; Figures 3 and 9
20 120 120 120 120
ns ns ns ns ns
Figures 4 and 10 Figures 5 and 10 Figures 5 and 10 Figures 4 and 10
NOTE 1: The input pulse is supplied by a generator with the following characteristics: PRR=250KHz, 50% duty cycle, tr < 6.0ns, Z0=50. NOTE 2: CL includes probe and stray capacitance.
Rev. 10/11/02
SP3490/3491 Low Power Full-Duplex RS485 Transceivers
(c) Copyright 2002 Sipex Corporation
5
SPECIFICATIONS (continued)
TAMB = TMIN to TMAX and VCC = +3.3V 5% unless otherwise noted.
PARAMETERS MIN. SP3491 RECEIVER DC Characteristics Differential Input Threshold -0.2 Input Hysteresis Output Voltage HIGH VCC-0.4 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 SP3491 RECEIVER AC Characteristics Maximum Data Rate 10 Receiver Input to Output, tPLH 40
TYP.
MAX.
UNITS
CONDITIONS
+0.2 25 0.4 +1 15 1.0 -0.8 60
Volts mV Volts Volts A k mA mA mA
-7V < VCM < 12V VCM = 0V IO = -1.5mA, VID = +200mV IO = +2.5mA, VID = -200mV 0V < VO < VCC; REB = VCC -7V < VCM < 12V DE = 0V, VCC = 0V or +3.6V, VIN = 12V DE = 0V, VCC = 0V or +3.6V, VIN = -7V 0V < VO < VCC
70
120 85 120 85
Mbps ns ns ns ns ns
REB = 0V, DE = VCC Figures 6 & 11 TAMB = +25oC, VCC = +3.3V, Figures 6 and 11
Receiver Input to Output, tPHL
40
70
Figures 6 & 11 TAMB = +25oC, VCC = +3.3V, Figures 6 and 11
tPHL(A) - tPLH(A) , tPHL(B) - tPLH(B) , Figures 6 & 11
Differential Receiver Skew Receiver Enable to Output LOW Receiver Enable to Output HIGH Receiver Disable from LOW Receiver Disable from HIGH POWER REQUIREMENTS Supply Voltage +3.0 Supply Current
4 65 65 65 65 150 150 200 200 +3.6 2000 1500
ns ns ns ns Volts A A
Figures 7 and 12; S1 closed, S2 open Figures 7 and 12; S2 closed, S1 open Figures 7 and 12; S1 closed, S2 open Figures 7 and 12; S2 closed, S1 open
1000 800
REB, D = 0V or VCC; DE = VCC DE=0V
S1 is open S2 is closed S3 = 1.5V 3V REB 0V tPRHZ VOH OUTPUT 0V 10% 1.5V tPRZH tPRSH
VCC 3V
S1 is closed S2 is open S3 = -1.5V
1.5V
1.5V
REB
0V
1.5V tPRLZ
1.5V tPRZL tPRSL 1.5V
OUTPUT
VOL 10%
Figure 12. Receiver Enable and Disable Waveforms
Rev. 10/11/02 SP3490/3491 Low Power Full-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation
6
PIN FUNCTION - SP3490
Vcc 1 R2 8A
Pin 1 - VCC - Positive supply +3.00 < VCC < +3.60 Pin 2 - R - Receiver output. Pin 3 - D - Driver input. Pin 4 - GND - Ground connection. Pin 5 - Y - Non-inverting driver output. Pin 6 - Z - Inverting driver output. Pin 7 - B - Inverting receiver input. Pin 8 - A - Non-inverting receiver input.
R
7B 6Z
D3 GND 4
D
5Y
Figure 13. Pinout for the SP3490
PIN FUNCTION - SP3491
NC 1 14 Vcc 13 NC 12 A
R2 REB 3 DE 4
R
11 B
10 Z D5 GND 6 GND 7
D
9Y 8 NC
Figure 14. Pinout for the SP3491
Pin 1 - NC - No connect. Pin 2 - R - Receiver output. Pin 3 - REB - Receiver output enable active LOW. Pin 4 - DE - Driver output enable active HIGH. Pin 5 - D - Driver input. Pin 6 - GND - Ground connection. Pin 7 - GND - Ground connection. Pin 8 - NC - No connect. Pin 9 - Y - Non-inverting driver output. Pin 10 - Z - Inverting driver output. Pin 11 - B - Inverting receiver input. Pin 12 - A - Non-inverting receiver input. Pin 13 - NC - No connect. Pin 14 - VCC - Positive supply +3.00 < VCC< +3.60
Rev. 10/11/02
SP3490/3491 Low Power Full-Duplex RS485 Transceivers
(c) Copyright 2002 Sipex Corporation
7
DESCRIPTION The SP3490 and the SP3491 are two members in the family of +3.3V low power full duplex transceivers that meet the electrical specifications of the RS-485 and RS-422 serial protocols. These devices are pin-to-pin compatible with the Sipex SP490 and the SP491 devices as well as popular industry standards. The SP3490 and the SP3491 feature Sipex's BiCMOS process allowing low power operation without sacrificing performance. Driver The drivers for both the SP3490 and SP3491 have differential outputs. The typical voltage output swing with no load will be 0 volts to VCC. With a load of 54 across the differential outputs, the driver maintains greater than 1.5V voltage levels. The driver of the SP3491 has a driver enable control line which is active high. A logic high on DE (pin 4) of the SP3491 will enable the differential driver outputs. A logic low on DE (pin 4) of the SP3491 will tri-state the driver outputs. The SP3490 does not have a driver enable.
Receiver The receivers for the SP3490 and SP3491 have differential inputs with an input sensitivity as low as 100mV. 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 SP3490 and SP3491 are equipped with a fail-safe feature that guarantees the receiver output will be in a high state when the input is left unconnected. The receiver of the SP3491 has a receiver enable control line which is active low. A logic low on REB (pin 3) of the SP3491 will enable the differential receiver. A logic high on REB (pin 3) of the SP3491 will tri-state the receiver.
Rev. 10/11/02
SP3490/3491 Low Power Full-Duplex RS485 Transceivers
(c) Copyright 2002 Sipex Corporation
8
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)
0.355/0.400 0.735/0.775 (9.017/10.160) (18.669/19.685) 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)
Rev. 10/11/02
SP3490/3491 Low Power Full-Duplex RS485 Transceivers
(c) Copyright 2002 Sipex Corporation
9
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) 0.337/0.344 (8.552/8.748) 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)
Rev. 10/11/02
SP3490/3491 Low Power Full-Duplex RS485 Transceivers
(c) Copyright 2002 Sipex Corporation
10
ORDERING INFORMATION
Model SP3490CN SP3490CP SP3490EN SP3490EP SP3491CN SP3491CP SP3491EN. SP3491EP Temperature Range 0C to +70C 0C to +70C -40C to +85C -40C to +85C
Package 8-Pin NSOIC 8-Pin DIP 8-Pin NSOIC 8-Pin DIP

Please consult the factory for pricing and availability on a Tape-On-Reel option.
Corporation
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com
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. Rev. 10/11/02 SP3490/3491 Low Power Full-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation
11

0C to +70C 0C to +70C -40C to +85C -40C to +85C
14-Pin NSOIC 14-Pin DIP 14-Pin NSOIC 14-Pin DIP

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