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| SP481/SP483/SP485 Low Power Half-Duplex RS-485 Transceivers FEATURES +5V Only Low Power BiCMOS Driver/Receiver Enable Slew Rate Limited Driver for Low EMI (SP483) Low Power Shutdown Mode (SP481 and SP483) RS-485 and RS-422 Drivers/Receivers RO 1 R 8 VCC B RE 2 7 DE 3 6 A D DI 4 SP485 Top View 5 GND SP481, SP483, SP485 Pinout (Top View) DESCRIPTION The SP481, SP483, and the SP485 are a family of half-duplex transceivers that meet the requirements of RS-485 and RS-422. Their BiCMOS design allows low power operation without sacrificing performance. The SP481 and SP485 meet the requirements of RS-485 and RS-422 up to 5Mbps. Additionally, the SP481 is equipped with a low power Shutdown mode. The SP483 is internally slew rate limited to reduce EMI and can meet the requirements of RS-485 and RS-422 up to 250kbps. The SP483 is also equipped with a low power Shutdown mode. RO 1 RE 2 DE 3 DI 4 R 8 Vcc 7B 6A D SP481, SP483, and SP485 5 GND Rev. 07/28/04 SP481/483/485 Low Power Half-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........................................................................................................12V Input Voltages Logic........................................................-0.3V to (VCC+0.5V) Drivers..................................................-0.3V to (VCC+0.5V) Receivers................................................................. 15V Output Voltages Logic........................................................-0.3V to (VCC+0.5V) Drivers...................................................................... 15V Receivers............................................-0.3V to (VCC+0.5V) Storage Temperature.......................................................-65C to +150C Power Dissipation...........................................................................500mW ELECTRICAL CHARACTERISTICS TMIN to TMAX and VCC = 5V 5% unless otherwise noted. PARAMETERS SP481/SP483/SP485 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 SP481/SP485 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 DE, DI, RE Applies to DE, DI, RE Applies to DE, DI, RE -7V VO +12V -7V VO +12V 2.0 0.8 10 35 35 250 250 5 30 30 5 15 40 40 40 40 60 60 10 40 70 70 70 70 Mbps ns ns ns ns ns ns ns ns RE = 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 CL = 100pF; see figures 4 & 7; S2 closed CL = 100pF; see figures 4 & 7; S1 closed CL = 15pF; see figures 2 & 9; S1 closed CL = 15pF; see figures 2 & 9; S2 closed SP481/SP483/SP485 RECEIVER DC Characteristics Differential Input Threshold Input Hysteresis Output Voltage High 2.4 Output Voltage Low 0.0 Three-State (High Impedance) Output Current Input Resistance Input Current (A, B); VIN = 12V Input Current (A, B); VIN = -7V Short-Circuit Current +0.2 10 5 0.4 1 15 +1.0 -0.8 95 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; RE = 5V -7V VCM +12V DE = 0V, VCC = 0V or 5.25V, VIN = 12V DE = 0V, VCC = 0V or 5.25V, VIN = -7V 0V VCM VCC Rev. 07/28/04 SP481/483/485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation 2 ELECTRICAL CHARACTERISTICS TMIN to TMAX and VCC = 5V 5% unless otherwise noted. PARAMETERS SP481/SP485 RECEIVER AC Characteristics Maximum Data Rate Receiver Input to Output 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 SP481 Shutdown Timing Time to Shutdown Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Output Low POWER REQUIREMENTS Supply Voltage Supply Current SP481/485 No Load SP483 No Load SP481/SP483 Shutdown Mode ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) Industrial (_E_) Storage Temperature Package Plastic DIP (_S) NSOIC (_N) MIN. TYP. MAX. UNITS CONDITIONS 5 60 60 90 90 13 20 20 20 20 200 200 Mbps ns ns ns RE = 0V, DE = 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 CRL = 15pF; Figures 2 & 9; S1 closed CRL = 15pF; Figures 2 & 9; S2 closed CRL = 15pF; Figures 2 & 9; S1 closed CRL = 15pF; Figures 2 & 9; S2 closed 50 50 50 50 ns ns ns ns 50 200 40 40 300 300 600 100 100 1000 1000 ns ns ns ns ns RE = 5V, DE = 0V CL = 100pF; See figures 4 & 7; S2 closed CL = 100pF; See figures 4 & 7; S1 closed CL = 15pF; See figures 2 & 9; S2 closed CL = 15pF; See figures 2 & 9; S1 closed +4.75 900 600 +5.25 Volts A A A A RE, DI = 0V or VCC; DE = VCC RE = 0V, DI = 0V or 5V; DE = 0V RE, DI = 0V or VCC; DE = VCC RE=0V, DI = 0V or 5V; DE = 0V DE = 0V, RE=VCC 10 A 0 -40 -65 +70 +85 +150 C C C Rev. 07/28/04 SP481/483/485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation 3 SP483 AC SPECIFICATIONS TMIN to TMAX and VCC = 5V 5% unless otherwise noted. PARAMETERS SP483 DRIVER AC Characteristics Maximum Data Rate Driver Input to Output Driver Skew Driver Rise and Fall Time MIN. TYP. MAX. UNITS CONDITIONS 250 250 250 800 800 100 2000 2000 800 2000 2000 2000 3000 3000 kbps ns ns ns ns ns ns ns ns tPLH; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 & 6 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 & 6 see figures 3 & 6, tSKEW = |tDPLH - tDPHL| 250 Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High SP483 RECEIVER AC Characteristics Maximum Data Rate 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 SP483 Shutdown Timing Time to Shutdown Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Output Low 250 250 300 300 From 10% to 90%; RDIFF = 54, CL1 = CL2 = 100pF, see figures 3 & 6 CL = 100pF; See figures 4 & 7; S2 closed CL = 100pF; See figures 4 & 7; S1 closed CL = 15pF; See figures 4 & 7; S1 closed CL = 15pF; See figures 4 & 7; S2 closed 250 250 100 20 20 20 20 2000 kbps ns ns Figures 3 & 8 Figures 3 & 8 tPLH; RDIFF = 54, CL1 = CL2 = 100pF; RDIFF = 54, CL1 = CL2 = 100pF; CRL = 15pF; Figures 2 & 9; S1 closed CRL = 15pF; Figures 2 & 9; S2 closed CRL = 15pF; Figures 2 & 9; S1 closed CRL = 15pF; Figures 2 & 9; S2 closed 50 50 50 50 ns ns ns ns 50 200 600 2000 2000 2500 2500 ns ns ns ns ns RE = 5V, DE = 0V CL = 100pF; See figures 4 & 7; S2 closed CL = 100pF; See figures 4 & 7; S1 closed CL = 15pF; See figures 4 & 7; S2 closed CL = 15pF; See figures 4 & 7; S1 closed RO 1 RE 2 DE 3 DI 4 R 8 7 6 VCC B A GND PIN FUNCTION Pin# Name Description 1 2 3 RO RE DE DI GND A B Vcc Receiver Output. Receiver Output Enable Active LOW. Driver Output Enable Active HIGH. Driver Input. Ground Connection. Driver Output/Receiver Input Non-inverting. Driver Output/Receiver Input Inverting. Positive Supply 4.75V D SP485 Top View 5 4 5 6 7 8 SP481, SP483, SP485 Pinout (Top View) Rev. 07/16/02 SP481/483/485 Low Power Half-Duplex RS485 Transceivers 4 DESCRIPTION SP481, SP483, SP485 The SP481, SP483, and SP485 are half-duplex differential transceivers that meet the requirements of RS-485 and RS-422. Fabricated with a Sipex proprietary BiCMOS process, all three products require a fraction of the power of older bipolar designs. The RS-485 standard is ideal for multi-drop applications and 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. Drivers SP481, SP483, SP485 The driver outputs of the SP481, SP483, and SP485 are differential outputs meeting the RS485 and RS-422 standards. 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 drivers can maintain greater than 1.5V voltage levels. The drivers of the SP481, SP483 and SP485 have an enable control line which is active HIGH. A logic HIGH on DE (pin 5) will enable the differential driver outputs. A logic LOW on DE (pin 5) will tri-state the driver outputs. The transmitters of the SP481 and SP485 will operate up to at least 5Mbps. The SP483 has internally slew rate limited driver outputs to minimize EMI. The maximum data rate for the SP483 driver is 250kbps. Receivers SP481, SP483, SP485 The SP481, SP483, and SP485 receivers 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 of the SP481, SP483 and SP485 have a tri-state enable control pin. A logic LOW on RE (pin 4) will enable the receiver, a logic HIGH on RE (pin 4) will disable the receiver. The receiver for the SP481 and SP485 will operate up to at least 5Mbps. The SP483 receiver is rated for data rates up to 250kbps. The receiver for each of the three devices is 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. Shutdown Mode SP481/SP483 The SP481 and SP483 are equipped with a Shutdown mode. To enable the Shutdown state, both the driver and receiver must be disabled simultaneously. A logic LOW on DE (pin 5) and a logic HIGH on RE (pin 4) will put the SP481 or SP483 into Shutdown mode. In Shutdown, supply current will drop to typically 1A. Rev. 07/28/04 SP481/483/485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation 5 A R VOD R B Figure 1. Driver DC Test Load Circuit 3V DE DI A B CL1 RDIFF CL2 A B 15pF RO VOC Receiver Output Test Point CRL 1K S1 1K VCC S2 Figure 2. Receiver Timing Test Load Circuit Output Under C L Test 500 S1 VCC S2 Figure 3. Driver/Receiver Timing Test Circuit Figure 4. Driver Timing Test Load #2 Circuit fSP481/485 = 1MHz; fSP483 = 100kHz ; tR < 10ns; tF < 10ns +3V DI 0V B A VO 1/2VO tDPLH tDPHL 1.5V tPLH tPHL 1/2VO 1.5V DRIVER OUTPUT DIFFERENTIAL VO+ OUTPUT 0V VA - VB VO- tSKEW = | tDPLH - tDPHL | Figure 6. Driver Propagation Delays tR tF INPUTS RE X X X X DE 1 1 0 1 DI 1 0 X X LINE CONDITION No Fault No Fault X Fault OUTPUTS B 0 1 Z Z A 1 0 Z Z INPUTS RE DE 0 0 0 0 0 0 1 0 A-B +0.2V -0.2V Inputs Open X OUTPUTS R 1 0 1 Z Table 2. Receive Function Truth Table Table 1. Transmit Function Truth Table Rev. 07/28/04 SP481/483/485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation 6 fSP481/485 = 1MHz; fSP483 = 100kHz; tR < 10ns; tF < 10ns +3V DE 0V 5V VOL VOH A, B 0V 2.3V tZH 1.5V tZL 2.3V Output normally LOW Output normally HIGH 1.5V tLZ 0.5V 0.5V tHZ A, B Figure 7. Driver Enable and Disable Times A-B V0D2+ V0D2- VOH VOL tPHL 0V INPUT 0V R 1.5V OUTPUT tPLH 1.5V fSP481/485 = 1MHz; fSP483 = 100kHz; tR < 10ns; tF < 10ns tSKEW = | tPHL - tPLH | Figure 8. Receiver Propagation Delays fSP481/485 = 1MHz; fSP483 = 100kHz; tR < 10ns; tF < 10ns +3V RE 0V 5V VIL VIH R 0V 1.5V tZH 1.5V tZL 1.5V Output normally LOW Output normally HIGH 1.5V tLZ 0.5V 0.5V tHZ R Figure 9. Receiver Enable and Disable Times Rev. 07/28/04 SP481/483/485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation 7 PACKAGE: 8 PIN NSOIC D e O E/2 E1/2 E1 L2 E Seating Plane O1 L1 1 L Gauge Plane O INDEX AREA (D/2 X E1/2) b VIEW C TOP VIEW A A1 Seating Plane A2 SIDE VIEW 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 D 4.90 BSC E 6.00 BSC E1 3.90 BSC e 1.27 BSC L 0.4 1.27 L1 1.04 REF L2 0.25 BSC o 0 8 o1 5 15 Note: Dimensions in (mm) B B SEE VIEW C b c BASE METAL SECTION B-B WITH PLATING Rev. 07/28/04 SP481/483/485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation 8 PACKAGE: 8 PIN PDIP N INDEX AREA E E1 E 1 2 3 N/2 c eA A1 eB D A e D1 L b3 b2 A2 b 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 e .100 BSC eA .300 BSC eB 0.43 L 0.115 0.13 0.15 Note: Dimensions in (mm) Rev. 07/28/04 SP481/483/485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation 9 ORDERING INFORMATION Model Temperature Range Package SP481CN .............EOL, recommended upgrade SP481E............ 0C to +70C ............................................................................... 8-pin NSOIC SP481CN/TR .......EOL, recommended upgrade SP481E............ 0C to +70C ............... ......................... ................................ 8-pin NSOIC SP481CS .............EOL, recommended upgrade SP481E............ 0C to +70C ............................................................................. 8-pin PDIP SP481EN .............EOL, recommended upgrade SP481E.......... .-40C to +85C ........................................................................... 8-pin NSOIC SP481EN/TR ........EOL, recommended upgrade SP481E...........-40C to +85C .......................................................................... 8-pin NSOIC SP481ES ..............EOL, recommended upgrade SP481E............ -40C to +85C ......................................................................... 8-pin PDIP SP483CN ...................................................................................... 0C to +70C ............................................................................... 8-pin NSOIC SP483CN/TR ................................................................................ 0C to +70C ............................................................................... 8-pin NSOIC SP483CS ...................................................................................... 0C to +70C ................................................................................ 8-pin PDIP SP483EN ..................................................................................... -40C to +85C ............................................................................. 8-pin NSOIC SP483EN/TR ............................................................................... -40C to +85C ............................................................................. 8-pin NSOIC SP483ES ..................................................................................... -40C to +85C .............................................................................. 8-pin PDIP SP485CN ...................................................................................... 0C to +70C ............................................................................... 8-pin NSOIC SP485CN/TR ................................................................................ 0C to +70C ............................................................................... 8-pin NSOIC SP485CS ...................................................................................... 0C to +70C ................................................................................ 8-pin PDIP SP485EN ..................................................................................... -40C to +85C ............................................................................. 8-pin NSOIC SP485EN/TR ............................................................................... -40C to +85C ............................................................................. 8-pin NSOIC SP485ES ..................................................................................... -40C to +85C .............................................................................. 8-pin PDIP For lead-free packages, improved ESD protection and performance: upgrade to SP485E, SP481E, SP483E Example: SP485EN/TR = upgrade to SP485EEN-L/TR /TR = Tape and Reel Pack quantity is 2,500 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 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. 07/28/04 SP481/483/485 Low Power Half-Duplex RS485 Transceivers (c) Copyright 2002 Sipex Corporation 10 |
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