® SP490/SP491 Full Duplex RS-485 Transceivers FEATURES ■ +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) Now Available in Lead Free Packaging 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 14 Vcc 13 NC 12 A NC 1 R 2 Vcc 1 R 8 A R 2 R 11 B REB 3 7 B DE 4 6 Z D 3 D GND 4 10 Z D 5 5 Y 9 Y GND 6 GND 7 SP490 Date: 02/24/05 D 8 NC SP491 SP490/491 Full Duplex RS-485 Transceivers 1 © Copyright 2005 Sipex Corporation 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....................................................-65˚C 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 MIN. TYP. MAX. UNITS CONDITIONS GND 2 VCC VCC Volts Volts 1.5 VCC Volts Unloaded; R = ∞ ; see figure 1 With Load; R = 50Ω; (RS422); see figure 1 With Load; R = 27Ω; (RS485); see figure 1 0.2 Volts R = 27Ω or R = 50Ω; see figure 1 3 0.8 ±10 Volts Volts Volts µA R = 27Ω or R = 50Ω; see figure 1 Applies to D Applies to D Applies to D 250 250 mA mA -7V ≤ VO ≤ +12V -7V ≤ VO ≤ +12V 30 60 Mbps ns Driver Input to Output 30 60 ns Driver Skew 5 Driver Rise or Fall Time 15 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 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 Date: 02/24/05 2.0 35 35 5 0.2 ns 40 +0.2 70 3.5 0.4 12 15 ±1.0 -0.8 85 ns Volts mV Volts Volts kΩ mA mA mA tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; see figures 3 and 6 tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; see figures 3 and 6 see figures 3 and 6, tSKEW = | tDPLH - tDPHL | From 10% to 90%; RDIFF = 54Ω, CL1 = CL2 = 100pF; see figures 3 and 6 -7V ≤ VCM ≤ 12V VCM = 0V IO = -4mA, VID = +200mV IO = +4mA, VID = -200mV -7V ≤ VCM ≤ 12V VIN = 12V VIN = -7V 0V ≤ VO ≤ VCC SP490/491 Full Duplex RS-485 Transceivers 2 © Copyright 2005 Sipex Corporation ELECTRICAL CHARACTERISTICS TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted. PARAMETERS SP490 RECEIVER AC Characteristics Maximum Data Rate Receiver Input to Output TYP. MAX. UNITS 90 150 Mbps ns Receiver Input to Output 90 150 ns Diff. Receiver Skew ItPLH-tPHLI 13 POWER REQUIREMENTS Supply Voltage Supply Current ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) Industrial (_E_) Storage Temperature Package Plastic DIP (_S_) NSOIC (_N) MIN. 5 ns CONDITIONS tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 8 tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 8 RDIFF = 54Ω; CL1 = CL2 = 100pF; Figures 3 & 8 +4.75 +5.25 Volts µA +70 +85 +150 °C °C °C 900 0 -40 -65 A VOD VCC S1 CRL R 1K Test Point Receiver Output R 1K VOC S2 B Figure 1. Driver DC Test Load Circuit Figure 2. Receiver Timing Test Load Circuit 3V DE DI CL1 A A RDIFF Output Under Test RO B B CL2 15pF 500 S1 VCC CL S2 Figure 3. Driver/Receiver Timing Test Circuit Date: 02/24/05 Figure 4. Driver Timing Test Load #2 Circuit SP490/491 Full Duplex RS-485 Transceivers 3 © Copyright 2005 Sipex Corporation f = 1MHz; tR < 10ns; tF < 10ns +3V 1.5V DI 1.5V 0V B DRIVER OUTPUT tPLH tPHL VO 1/2VO 1/2VO A tDPLH DIFFERENTIAL VO+ OUTPUT 0V V A – V B V O– tDPHL tR tF tSKEW = | tDPLH - tDPHL | Figure 6. Driver Propagation Delays f = 1MHz; tR < 10ns; tF < 10ns +3V 1.5V DE 1.5V 0V tZL tLZ 5V 2.3V A, B VOL VOH A, B 2.3V 0V Output normally LOW 0.5V Output normally HIGH 0.5V tZH tHZ Figure 7. Driver Enable and Disable Times V0D2+ A–B 0V INPUT V0D2– VOH 1.5V R VOL tPHL OUTPUT 0V 1.5V tPLH f = 1MHz; tR < 10ns; tF < 10ns tSKEW = | tPHL - tPLH | Figure 8. Receiver Propagation Delays Date: 02/24/05 SP490/491 Full Duplex RS-485 Transceivers 4 © Copyright 2005 Sipex Corporation 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......................................................-65˚C 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 MIN. TYP. MAX. UNITS CONDITIONS GND 2 VCC VCC Volts Volts 1.5 VCC Volts Unloaded; R = ∞ ; see figure 1 With Load; R = 50Ω; (RS422); see figure 1 With Load; R = 27Ω; (RS485); see figure 1 0.2 Volts R = 27Ω or R = 50Ω; see figure 1 3 0.8 ±10 Volts Volts Volts µA R = 27Ω or R = 50Ω; see figure 1 Applies to D, REB, DE Applies to D, REB, DE Applies to D, REB, DE 250 250 mA mA -7V ≤ VO ≤ 12V -7V ≤ VO ≤ 12V REB = 5V, DE = 5V tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; see figures 3 and 6 tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; see figures 3 and 6 see figures 3 and 6, tSKEW = | tDPLH - tDPHL | From 10% to 90%; RDIFF = 54Ω, 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 2.0 35 35 SP491 DRIVER AC Characteristics Maximum Data Rate Driver Input to Output 5 20 30 60 Mbps ns Driver Input to Output 20 30 60 ns 5 10 ns 15 40 ns Driver Enable to Output High 40 70 ns Driver Enable to Output Low 40 70 ns Driver Disable Time from Low 40 70 ns Driver Disable Time from High 40 70 ns Driver Skew Driver Rise or Fall Time Date: 02/24/05 3 SP490/491 Full Duplex RS-485 Transceivers 5 © Copyright 2005 Sipex Corporation 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 TYP. MAX. UNITS CONDITIONS +0.2 Volts mV Volts Volts -7V ≤ VCM ≤ 12V VCM = 0V IO = -4mA, VID = +200mV IO = +4mA, VID = -200mV ±1.0 -0.8 85 µA kΩ mA mA mA 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 90 150 Mbps ns 90 150 ns ns REB = 0V tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 8 tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 8 RDIFF = 54Ω; CL1 = CL2 = 100pF; ns ns ns ns 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 Volts µA REB, D = 0V or VCC; DE = VCC 70 0.4 ±1 15 60 Diff. Receiver Skew ItPLH-tPHLI 13 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 20 20 20 20 SP491 ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) Industrial (_E_) Storage Temperature Package Plastic DIP (_S_) NSOIC (_N) Figures 3 & 8 50 50 50 50 +5.25 600 0 -40 -65 +70 +85 +150 °C °C °C +3V RE 0V 1.5V f = 1MHz; t < 10ns; t < 10ns R F tZL 1.5V tLZ 5V 1.5V R VIL Output normally LOW 0.5V Output normally HIGH 0.5V VIH R 1.5V 0V tZH tHZ Figure 9. Receiver Enable and Disable Times Date: 02/24/05 SP490/491 Full Duplex RS-485 Transceivers 6 © Copyright 2005 Sipex Corporation DESCRIPTION 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. 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. Receiver... 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. 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 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 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. Driver... 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. 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 54Ω across the differential outputs, the driver can maintain greater than 1.5V voltage levels. Date: 02/24/05 SP490/491 Full Duplex RS-485 Transceivers 7 © Copyright 2005 Sipex Corporation PACKAGE: 8 PIN NSOIC D Ø e E/2 L2 E1/2 E1 E Seating Plane L1 1 Gauge Plane VIEW C b INDEX AREA (D/2 X E1/2) Ø L Ø1 TOP VIEW A1 A Seating Plane A2 8 Pin NSOIC JEDEC MO-012 (AA) Variation MIN NOM MAX SYMBOL A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.24 4.90 BSC D 6.00 BSC E 3.90 BSC E1 1.27 BSC e L 0.4 1.27 1.04 REF L1 0.25 BSC L2 ø 0º 8º ø1 5º 15º SIDE VIEW B B SEE VIEW C b c Note: Dimensions in (mm) BASE METAL SECTION B-B WITH PLATING Date: 02/24/05 SP490/491 Full Duplex RS-485 Transceivers 8 © Copyright 2005 Sipex Corporation PACKAGE: 14 PIN NSOIC D Ø e E/2 L2 E1 E E1/2 Seating Plane L1 Gauge Plane VIEW C 1 INDEX AREA (D/2 X E1/2) Ø L Ø1 b TOP VIEW A1 A Seating Plane SIDE VIEW A2 14 Pin NSOIC JEDEC MO-012 (AB) Variation MIN NOM MAX SYMBOL A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.25 8.65 BSC D 6.00 BSC E 3.90 BSC E1 1.27 BSC e L 0.4 1.27 1.04 REF L1 0.25 BSC L2 ø 0º 8º ø1 5º 15º B B SEE VIEW C b c Note: Dimensions in (mm) BASE METAL SECTION B-B WITH PLATING Date: 02/24/05 SP490/491 Full Duplex RS-485 Transceivers 9 © Copyright 2005 Sipex Corporation PACKAGE: 8 PIN PDIP N E INDEX AREA E1 1 2 3 E N/2 c eA A1 eB D A e A2 D1 L b3 b b2 b c 8 PIN PDIP JEDEC MS-001 (BA) Variation SYMBOL MIN NOM MAX A 0.21 A1 0.15 A2 0.115 0.13 0.195 b 0.014 0.018 0.022 b2 0.045 0.06 0.07 b3 0.3 0.039 0.045 c 0.008 0.01 0.014 D 0.355 0.365 0.4 D1 0.005 E 0.3 0.31 0.325 E1 0.24 0.25 0.28 .100 BSC e .300 BSC eA eB 0.43 L 0.115 0.13 0.15 Note: Dimensions in (mm) Date: 02/24/05 SP490/491 Full Duplex RS-485 Transceivers 10 © Copyright 2005 Sipex Corporation PACKAGE: 14 PIN PDIP N E INDEX AREA E1 E 1 2 3 N/2 c eA eB A1 D A e A2 D1 L b3 b2 b 14 PIN PDIP JEDEC MS-001 (AA) Variation SYMBOL MIN NOM MAX A 0.21 A1 0.15 A2 0.115 0.13 0.195 b 0.014 0.018 0.022 b2 0.045 0.06 0.07 b3 0.3 0.039 0.045 c 0.008 0.01 0.014 D 0.735 0.75 0.755 D1 0.005 E 0.3 0.31 0.325 E1 0.24 0.25 0.28 .100 BSC e .300 BSC eA eB 0.43 L 0.115 0.13 0.15 Note: Dimensions in (mm) Date: 02/24/05 SP490/491 Full Duplex RS-485 Transceivers 11 b c © Copyright 2005 Sipex Corporation ORDERING INFORMATION Model Temperature Range Package SP490CN. ..................................................................................... 0˚C to +70˚C ............................................................................... 8-Pin NSOIC SP490CN/TR ................................................................................ 0˚C to +70˚C ............................................................................... 8-Pin NSOIC SP490CS ...................................................................................... 0˚C to +70˚C ................................................................................ 8-Pin PDIP SP490EN ..................................................................................... -40˚C to +85˚C ............................................................................. 8-Pin NSOIC SP490EN/TR ............................................................................... -40˚C to +85˚C ............................................................................. 8-Pin NSOIC SP490ES ..................................................................................... -40˚C to +85˚C .............................................................................. 8-Pin PDIP SP491CN ...................................................................................... 0˚C to +70˚C .............................................................................. 14-Pin NSOIC SP491CN/TR ................................................................................ 0˚C to +70˚C .............................................................................. 14-Pin NSOIC SP491CS ...................................................................................... 0˚C to +70˚C ............................................................................... 14-Pin PDIP SP491EN ..................................................................................... -40˚C to +85˚C ............................................................................ 14-Pin NSOIC SP491EN/TR ............................................................................... -40˚C to +85˚C ............................................................................ 14-Pin NSOIC SP491ES ..................................................................................... -40˚C to +85˚C ............................................................................. 14-Pin PDIP Available in lead free packaging. To order add "-L" suffix to part number. Example: SP491CN/TR = standard; SP491CN-L/TR = lead free /TR = Tape and Reel Pack quantity is 2500 for NSOIC. CLICK HERE TO ORDER SAMPLES 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: 02/24/05 SP490/491 Full Duplex RS-485 Transceivers 12 © Copyright 2005 Sipex Corporation