® Preliminary SP1490E/SP1491E Full Duplex RS-485 Transceivers FEATURES ■ +5V Only ■ Low Power BiCMOS ■ Driver/Receiver Enable (SP1491E) ■ RS-485 and RS-422 Drivers/Receivers ■ Pin Compatible with SN75179 (SP1490E) ■ Pin Compatible with SN75180 (SP1491E) ■ Improved ESD Specifications ±15kV Human Body Model ±15kV IEC1000-4-2 Air Discharge ±8kV IEC1000-4-2 Contact Discharge 8 A VCC 1 RO 2 SP1490E DI 3 8 Pin - nSOIC 7 B GND 4 6 Z 5 Y APPLICATIONS ■ Industial Networks ■ Telecom ■ Motor Control ■ HVAC/ Building Control DESCRIPTION The SP1490E is a low power differential line driver/receiver meeting RS-485 and RS-422 standards up to 20Mbps. The SP1491E is identical to the SP1490E with the addition of driver and receiver tri-state enable lines. Both products feature ±200mV receiver input sensitivity, over wide common mode range. The SP1490E is available in 8-pin plastic DIP and 8-pin NSOIC packages for operation over the commercial and industrial temperature ranges. The SP1491E is available in 14-pin DIP and 14-pin NSOIC packages for operation over the commercial and industrial temperature ranges. BLOCK DIAGRAM 14 Vcc 13 NC 12 A NC 1 Vcc 1 8 A RO 2 RO 2 R R 7 B 11 B REB 3 6 Z DI 3 DE 4 D 10 Z 5 Y GND 4 DI 5 D 9 Y GND 6 GND 7 SP1490E Date: 5/18/04 8 NC SP1491E SP1490E/1491E Full Duplex RS-485 Transceivers 1 © Copyright 2004 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 SP1490E/1491E 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 SP1490E/1491E DRIVER AC Characteristics Maximum Data Rate Driver Input to Output Driver Input to Output MIN. TYP. UNITS CONDITIONS 3.5 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 2.0 20 30 40 Mbps ns 30 40 ns 5 ns Driver Skew Driver Rise or Fall Time MAX. 8 20 ns SP1491E only Driver Enable to Output High 20 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 Date: 5/18/04 tR/F; RDIFF = 54Ω, CL1 = CL2 = 100pF; see figures 3 and 6 tR/F; RDIFF = 54Ω, CL1 = CL2 = 100pF; see figures 3 and 6 see figures 3 and 6, tR/F = | tDPLH - tDPHL | From 10% to 90%; RDIFF = 54Ω, CL1 = CL2 = 100pF; see figures 3 and 6 tR/F 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 SP1490E/1491E Full Duplex RS-485 Transceivers 2 © Copyright 2004 Sipex Corporation SPECIFICATIONS (continued) TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted. SP1490E/1491E 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 +0.2 -7V ≤ VCM ≤ 12V VCM = 0V IO = -4mA, VID = +200mV IO = +4mA, VID = -200mV -7V ≤ VCM ≤ 12V (1 unit load) VIN = 12V VIN = -7V 0V ≤ VO ≤ VCC CONDITIONS 3.5 0.4 12 PARAMETERS SP1490E/1491E RECEIVER AC Characteristics Maximum Data Rate Receiver Input to Output Receiver Input to Output 15 MIN. TYP. MAX. UNITS 20 20 45 50 Mbps ns 20 45 50 ns 5 40 10 70 ns ns Diff. Receiver Skew ItPLH-tPHLI Receiver Tplh/Tphl POWER REQUIREMENTS Supply Voltage Supply Current ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) Industrial (_E_) Storage Temperature Package Plastic DIP (_S_) NSOIC (_N) ±1.0 -0.8 85 Volts mV Volts Volts kΩ mA mA mA 70 +4.75 +5.25 Volts µA +70 +85 +150 °C °C °C 900 0 -40 -65 A tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 8 tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 8 RDIFF = 54Ω; CL1 = CL2 = 100pF; R R VCC S1 CRL VOD 1K Test Point Receiver Output 1K VOC S2 B Figure 2. Receiver Timing Test Load Circuit Figure 1. Driver DC 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: 5/18/04 Figure 4. Driver Timing Test Load #2 Circuit SP1490E/1491E Full Duplex RS-485 Transceivers 3 © Copyright 2004 Sipex Corporation f = 1MHz; tR < 10ns; tF < 10ns +3V 1.5V DI 1.5V 0V DRIVER OUTPUT B tPLH tPHL VO 1/2VO 1/2VO A tDPLH DIFFERENTIAL VO+ OUTPUT 0V VA – VB VO– 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 SP1491E only 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: 5/18/04 SP1490E/1491E Full Duplex RS-485 Transceivers 4 © Copyright 2004 Sipex Corporation DETAILED DESCRIPTION The SP1490E and SP1491E 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 driver of the SP1491E has a driver enable control line which is active high. A logic high on DE (pin 4) of the SP1491E will enable the differential driver outputs. A logic low on DE (pin 4) of the SP1491E will tri-state the driver outputs. The SP1490E does not have a driver enable. 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. Receiver... The receivers for both the SP1490E and SP1491E 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 SP1490E and SP1491E 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 and floating. Driver... The drivers for both the SP1490E and SP1491E 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. INPUTS DE SP1491E only The receiver of the SP1491E has a receiver enable control line which is active low. A logic low on REB (pin 3) of the SP1491E will enable the differential receiver. A logic high on REB (pin 3) of the SP1491E will tri-state the receiver. INPUTS OUTPUTS DI Y Z RE SP1491E only 1 1 0 1 0 x 1 0 z 0 1 z 0 0 0 1 Transmit Function Truth Table OUTPUTS A-B R +0.2V -0.2V open x 1 0 1 z Recieve Function Truth Table Date: 5/18/04 SP1490E/1491E Full Duplex RS-485 Transceivers 5 © Copyright 2004 Sipex Corporation PACKAGE: 8 PIN NSOIC D e E/2 E1 E SEE VIEW C E1/2 1 b INDEX AREA (D/2 X E1/2) Ø1 TOP VIEW Gauge Plane L2 Seating Plane Ø1 Ø L L1 VIEW C A2 A SEATING PLANE A1 SIDE VIEW 8 Pin NSOIC (JEDEC MS-012, AA - VARIATION) b WITH PLATING DIMENSIONS Minimum/Maximum (mm) COMMON HEIGHT DIMENSION SYMBOL A A1 A2 b c D E E1 e L L1 L2 Ø Ø1 Date: 5/18/04 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 0º 8º 5º 15º c BASE METAL CONTACT AREA PACKAGE: 8 PIN NSOIC (Narrow refers to symbol E1) SP1490E/1491E Full Duplex RS-485 Transceivers 6 © Copyright 2004 Sipex Corporation PACKAGE: 14 PIN NSOIC D e E/2 E1 E E1/2 SEE VIEW C 1 B INDEX AREA (D/2 X E1/2) b Ø1 TOP VIEW Gauge Plane L2 Seating Plane Ø1 Ø L L1 VIEW C A2 A A1 14 Pin NSOIC (JEDEC MS-012, AB - VARIATION) SIDE VIEW DIMENSIONS Minimum/Maximum (mm) b WITH PLATING COMMON HEIGHT DIMENSION SYMBOL A A1 A2 b c D E E1 e L L1 L2 Ø Ø1 Date: 5/18/04 MIN NOM MAX - 1.75 1.35 0.25 0.10 1.25 1.65 0.31 0.51 0.17 0.25 8.65 BSC 6.00 BSC 3.90 BSC 1.27 BSC 0.40 1.27 1.04 REF 0.25 BSC 0º 8º 5º - 15º c BASE METAL CONTACT AREA 14 PIN NSOIC (Narrow refers to symbol E1) SP1490E/1491E Full Duplex RS-485 Transceivers 7 © Copyright 2004 Sipex Corporation PACKAGE: 8 PIN PDIP A1 D A N A2 D1 b3 L b1 b e INDEX AREA E1 E 1 2 3 8 PIN PDIP JEDEC MS-001 (BA) Variation A Dimensions in (mm) MIN - E NOM MAX - .210 - - A1 .015 A2 .115 .130 .195 b .014 .018 .022 b2 .045 .060 .070 b3 .030 .039 .045 SEE LEAD DETAIL c c .008 .010 .014 eA D .355 .365 .400 eB D1 .005 - - E .300 .310 .325 E1 .240 .250 .280 .100 BSC e eA b .300 BSC eB - - .430 L .115 .130 .150 C 8 pin PDIP Date: 5/18/04 SP1490E/1491E Full Duplex RS-485 Transceivers 8 © Copyright 2004 Sipex Corporation PACKAGE: 14 PIN PDIP A1 D A N A2 D1 b3 L b1 b e INDEX AREA E1 E 1 2 3 14 PIN PDIP JEDEC MS-001 (AA) Variation A Dimensions in (mm) MIN - - SEE LEAD DETAIL .210 A1 .015 - - A2 .115 .130 .195 .014 b E NOM MAX .018 .022 b2 .045 .060 .070 b3 .030 .039 .045 c c .008 .010 .014 eA D .735 .750 .775 eB D1 .005 - - E .300 .310 .325 E1 .240 .250 .280 .100 BSC e eA b .300 BSC eB - - .430 L .115 .130 .150 C 14 pin PDIP Date: 5/18/04 SP1490E/1491E Full Duplex RS-485 Transceivers 9 © Copyright 2004 Sipex Corporation ORDERING INFORMATION Part Number TopMark Temperature Range Package SP1490ECN. ................................................. 1490ECNYYWW...................................0˚C to +70˚C ................................................ 8-Pin NSOIC SP1490ECN/TR. ........................................... 1490ECNYYWW...................................0˚C to +70˚C ................................................ 8-Pin NSOIC SP1490EEN. ............................................... SP1490EENYYWW...............................-40˚C to +85˚C .............................................. 8-Pin NSOIC SP1490EEN/TR. .......................................... SP1490EENYYWW...............................-40˚C to +85˚C .............................................. 8-Pin NSOIC SP1490ECP. ................................................. SP1490ECPYYWW...............................0˚C to +70˚C ................................................ 8-Pin PDIP SP1490EEP. ................................................ SP1490EEPYYWW...............................-40˚C to +85˚C ............................................... 8-Pin PDIP SP1491ECN. ................................................. SP1491ECNYYWW...............................0˚C to +70˚C .............................................. 14-Pin NSOIC SP1491ECN/TR. ........................................... SP1491ECNYYWW...............................0˚C to +70˚C .............................................. 14-Pin NSOIC SP1491EEN. ............................................... SP1491EENYYWW...............................-40˚C to +85˚C ............................................. 14-Pin NSOIC SP1491EEN/TR. .......................................... SP1491EENYYWW...............................-40˚C to +85˚C ............................................. 14-Pin NSOIC SP1491ECP. ................................................. SP1491ECPYYWW...............................0˚C to +70˚C ............................................... 14-Pin PDIP SP1491EEP. ................................................ SP1491EEPYYWW...............................-40˚C to +85˚C .............................................. 14-Pin PDIP /TR = Tape and Reel Pack quantity is 2500 for Narrow SOIC. REVISION HISTORY DATE 02/09/04 04/14/04 05/18/04 REVISION A B C DESCRIPTION Production Release. Included 8 Pin NSOIC package spec Added Topmark information. Removed PDIP package option. 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: 5/18/04 SP1490E/1491E Full Duplex RS-485 Transceivers 10 © Copyright 2004 Sipex Corporation