SP3490 SIPEX | Alldatasheet
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Technical content
Rev. 10/11/02 SP3490/3491 Low Power Full-Duplex RS485 Transceivers © Copyright 2002 Sipex Corporation ■ 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 ) SP3490/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. 7 8 Vcc GND R D A B Z Y R D 14NC REB DE GND NC NC 4 5 R D Vcc GND R D A B Z Y SP3490 SP3491 +3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate
Rev. 10/11/02 SP3490/3491 Low Power Full-Duplex RS485 Transceivers © Copyright 2002 Sipex Corporation SPECIFICATIONS TAMB = TMIN to TMAX and VCC = +3.3V ± 5% unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP3491 DRIVER DC Characteristics Differential Output Voltage GND V CC Volts Unloaded; R = ∞; Figure 1 Differential Output Voltage 2 V CC Volts With Load; R = 50Ω; (RS-422); Figure 1 Differential Output Voltage 1.5 V CC Volts With Load; R = 27Ω; (RS-485); Figure 1 Change in Magnitude of Driver Differential Output Voltage for Complimentary States 0.2 Volts R = 27 Ω or R = 50Ω; Figure 1 Driver Common-Mode Output Voltage 3 Volts R = 27 Ω or R = 50Ω; Figure 1 Input HIGH Voltage 2.0 Volts Applies to D, REB, DE Input LOW Voltage 0.8 Volts Applies to D, REB, DE Input Current +10 µA Applies to D, REB, DE Driver Short-Circuit Current V OUT = HIGH +250 mA -7V < VO < +12V VOUT = LOW +250 mA -7V < VO < +12V SP3491 DRIVER AC Characteristics Maximum Data Rate 10 Mbps Driver Input to Output, t PLH 20 40 60 ns Figures 2 and 8 Driver Input to Output, tPHL 20 40 60 ns Figures 2 and 8 Differential Driver Skew 2 ns t PHL (Y) - tPLH (Y) , tPHL (Z) - tPLH (Z) , Figures 2 and 8 Driver Rise or Fall Time 5 20 ns From 10% to 90%; Figures 3 and 9 Driver Enable to Output HIGH 52 120 ns Figures 4 and 10 Driver Enable to Output LOW 60 120 ns Figures 5 and 10 Driver Disable from LOW 40 120 ns Figures 5 and 10 Driver Disable from HIGH 60 120 ns 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=50Ω. NOTE 2: CL includes probe and stray capacitance.
TAMB = TMIN to TMAX and VCC = +3.3V ± 5% unless otherwise noted. Figure 12. Receiver Enable and Disable Waveforms
Rev. 10/11/02 SP3490/3491 Low Power Full-Duplex RS485 Transceivers © Copyright 2002 Sipex Corporation 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 V CC. With a load of 54Ω 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 differ- ential 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 15kΩ (12kΩ 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 © Copyright 2002 Sipex Corporation D ALTERNATE END PINS (BOTH ENDS) D1 = 0.005" min. (0.127 min.) E PACKAGE: PLASTIC DUAL–IN–LINE (NARROW) DIMENSIONS (Inches) Minimum/Maximum (mm) A = 0.210" max. (5.334 max). C ØL A1 = 0.015" min. (0.381min.) B e = 0.100 BSC (2.540 BSC) eA = 0.300 BSC (7.620 BSC) B C D E L Ø 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) 0.735/0.775 (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°) 0.115/0.195 (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 (9.017/10.160) 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°) 8–PIN 14–PIN
Rev. 10/11/02 SP3490/3491 Low Power Full-Duplex RS485 Transceivers © Copyright 2002 Sipex Corporation D EH PACKAGE: PLASTIC SMALL OUTLINE (SOIC) (NARROW) DIMENSIONS (Inches) Minimum/Maximum (mm) 8–PIN A Ø LBe h x 45° A B D E e H h L Ø 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) (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 © Copyright 2002 Sipex Corporation
ORDERING INFORMATION
Model Temperature Range Package SP3490CN 0˚C to +70˚C 8-Pin NSOIC SP3490CP 0˚C to +70˚C 8-Pin DIP SP3490EN -40˚C to +85˚C 8-Pin NSOIC SP3490EP -40˚C to +85˚C 8-Pin DIP SP3491CN 0˚C to +70˚C 14-Pin NSOIC SP3491CP 0˚C to +70˚C 14-Pin DIP SP3491EN. -40˚C to +85˚C 14-Pin NSOIC SP3491EP -40˚C to +85˚C 14-Pin DIP 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. 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