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| (R) SP481R/SP485R High-Fanout RS-485 Transceiver s Allows Over 400 Transceivers On A Transmission Line s High Impedance on Receiver Inputs (RIN = 150k typical) s Half-Duplex Configuration Consistant With Industry Standard Pinout s -7V to +12V Common Mode Input Voltage Range s Includes Shutdown Mode (ICC < 10A) (For SP481R Only) s Low Power Consumption (250mW) s Separate Driver and Receiver Enable DESCRIPTION... The SP481R and SP485R are our newest members of Sipex's RS-485 family. The SP481R and SP485R are pin-to-pin equivalent with our existing SP485 product and contain enhancements such as higher ESD tolerance and high receiver input impedance. The higher receiver input impedance allows for connecting over 400 transceivers on a single transmission line without degrading the RS-485 driver signal. Each device is packaged in an 8-pin plastic DIP or 8-pin narrow SOIC package. The SP481R offers a shutdown feature via the enable pins which will reduce the supply current (ICC) below 1A typical. RO 1 R 8 VCC RE 2 7 B DE 3 6 A D DI 4 SP485 Top View 5 GND SP485RDS/08 SP485R RS-485 Serial Transceiver (c) Copyright 2000 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...........................................................................+7V Storage Temperature..........................-65C to +150C Power Dissipation 8-pin Plastic DIP...........................1000mW 8-pin Plastic N-SOIC.......................1000mW Package Derating: 8-pin Plastic DIP oJA....................................................62 C/W 8-pin Plastic N-SOIC oJA....................................................62 C/W SPECIFICATIONS Typically 25C @ Vcc = +5V unless otherwise noted. MIN. LOGIC INPUTS VIL VIH LOGIC OUTPUTS VOL VOH RS-485 DRIVER DC Characteristics TTL Input Levels VIL VIH Outputs Open Circuit Voltage Differential Output Balance Common-Mode Output Output Current Short Circuit Current AC Characteristics Maximum Data Rate Output Transition Time Propagation Delay tPHL tPLH Driver Output Skew RS-485 RECEIVER DC Characteristics TTL Output Levels VOL VOH Tri-State Output Current Inputs Common Mode Range Receiver Sensitivity Input Impedance TYP. MAX. 0.8 UNITS Volts Volts Volts Volts CONDITIONS 2.0 0.4 2.4 IOUT= -3.2mA IOUT= 1.0mA 0.8 2.0 1.5 28.0 5 30 60 60 5 100 100 15 6.0 5.0 0.2 3.0 250 Volts Volts Volts Volts Volts Volts mA mA Mbps ns ns ns ns RL=54, CL=50pF |VT| - |VT| RL=54 Terminated in -7V to +12V RL=54 Rise/fall time, 10%-90% See Figures 3 and 5 RDIFF=54, CL1=CL2=100pF RDIFF=54, CL1=CL2=100pF see Figure 3 and 5, tSKEW = | tDPLH - tDPHL | 0.4 2.4 -7.0 120 150 1 +12.0 0.2 Volts Volts A Volts Volts k 0.4VVOUT 2.4V; RE = VCC -7V VCM +12V -7V VCM +12V SP485RDS/08 SP485R RS-485 Serial Transceiver (c) Copyright 2000 Sipex Corporation 2 SPECIFICATIONS Typically 25C @ Vcc = +5V unless otherwise noted. MIN. AC Characteristics Maximum Data Rate Propagation Delay tPHL tPLH Differential Receiver Skew TYP. MAX. UNITS CONDITIONS 1 1200 1200 60 Mbps ns ns ns See Figures 3 and 7 RDIFF=54, CL1=CL2=100pF RDIFF=54, CL1=CL2=100pF | tPLH - tPHL |; RDIFF=54, CL1=CL2=100pF, see Figures 3 and 7 SHUTDOWN TIMING (SP481R) Time to Shutdown 50 RS-485 Driver Enable Time Enable to Low Enable to High Disable Time Disable From Low Disable From High RS-485 Receiver Enable Time Enable to Low Enable to High Disable Time Disable From Low Disable From High POWER REQUIREMENTS Supply Voltage VCC Supply Current ICC No Load No Load Supply Current in Shutdown ENVIRONMENTAL Operating Temperature Commercial (..C..) Industrial (..E..) Storage Temperature 600 40 40 40 40 40 40 40 40 500 500 500 500 500 500 500 500 ns ns ns ns ns ns ns ns ns RE = VCC, DE = 0V See Figures 4 and 6 CL=15pF, S1 Closed CL=15pF, S2 Closed See Figures 4 and 6 CL=15pF, S1 Closed CL=15pF, S2 Closed See Figures 2 and 8 CL=15pF, S1 Closed CL=15pF, S2 Closed See Figures 2 and 8 CL=15pF, S1 Closed CL=15pF, S2 Closed +4.75 300 500 0.5 +5.25 500 900 10 Volts A A A RE = VCC or 0V, DE = 0V RE = VCC or 0V, DE = VCC RE = VCC, DE = OV 0 -40 -65 +70 +85 +150 C C C RECEIVER INPUT GRAPH RS-485 RECEIVER +1.0mA -7V -3V +6V +12V -0.6mA 1 Unit Load Maximum Input Current versus Voltage SP485RDS/08 SP485R RS-485 Serial Transceiver (c) Copyright 2000 Sipex Corporation 3 TEST CIRCUITS A R VOD R B Figure 1. Driver DC Test Load Circuit Figure 2. Receiver Timing Test Load Circuit Receiver Output CRL Test Point S1 1k S2 1k VCC VOC CL1 DI A B CL2 RL A RO B 15pF Output Under Test 500 CL S1 VCC S2 Figure 3. Driver/Receiver Timing Test Circuit Figure 4. Driver Timing Test Load #2 Circuit SWITCHING WAVEFORMS +3V DI 0V DRIVER OUTPUT B A f = 1MHz; tR < 10ns; tF < 10ns 1.5V tPLH VO 1/2VO tDPLH tDPHL tPHL 1.5V tPLH 1/2VO DIFFERENTIAL VO+ OUTPUT 0V VA - VB VO- tSKEW = | tDPLH - tDPHL | tR tF Figure 5. Driver Propagation Delays SP485RDS/08 SP485R RS-485 Serial Transceiver (c) Copyright 2000 Sipex Corporation 4 +3V DE 0V 5V A, B VOL VOH A, B 0V f = 1MHz; tR < 10ns; tF < 10ns 1.5V tZL 2.3V Output normally LOW 1.5V tLZ 0.5V 0.5V tHZ 2.3V tZH Output normally HIGH Figure 6. Driver Enable and Disable Times f = 1MHz; tR < 10ns; tF < 10ns V0D2+ A-B V0D2- VOH RECEIVER OUT VOL tPHL 1.5V 0V INPUT 0V OUTPUT tPLH 1.5V tSKEW = | tPHL - tPLH | Figure 7. Receiver Propagation Delays +3V RE 0V 5V RECEIVER OUT VIL VIH RECEIVER OUT 0V 1.5V f = 1MHz; t < 10ns; t < 10ns R F tZL 1.5V Output normally LOW 1.5V tLZ 0.5V 0.5V tHZ 1.5V tZH Output normally HIGH Figure 8. Receiver Enable and Disable Times SP485RDS/08 SP485R RS-485 Serial Transceiver (c) Copyright 2000 Sipex Corporation 5 GENERAL DESCRIPTION The SP485R is a low power RS-485 differential transceiver. Similar to the SP485, the SP485R contains a half-duplex driver and receiver with tri-state control. However, the SP485R is intended for increased connections on a single bus compared to the orignal RS-485 specification. The RS-485 standard is ideal for multi-drop applications where one bus can contain many drivers and/or receivers. The RS-485 specification allows up to 32 transceivers to be connected on to the data bus. RS-485 is also specified for driving higher speeds over long cable lengths of up to 4,000 feet. DRIVERS The driver output complies with the RS-485 electrical characteristics as specified by the standard. The output swings from 0V to VCC and decreases to greater than +1.5V with a 54 load attached between the two outputs. In adhering to the RS-485 specification, the driver outputs inherently comply with the RS-422 standard. With a load of 100 between the two outputs, the driver can sustain at least +2.0V. The driver contains an enable pin (DE) which tri-states the output when DE is a logic LOW. The outputs during the tri-stated condition are at a high impedance (>100k). A logic HIGH enables the driver for normal operation. The driver can operate to at least 5Mbps. RECEIVERS The SP485R receiver has differential inputs with an input sensitivity of lower than 200mV. As mentioned above, the RS-485 specification allows up to 32 transceivers on a the same bus. The SP485R allows over 400 transceivers on the same bus due to the high input impedance of at least 98k. This higher capacity allows more components to be attached to the same bus without degrading the signal quality. The drivers are still able to drive an equivalent 54 from the 320 transceivers with an input impedance of at least 120k in parallel along with the two 125 cable termination resistors on each end. The receiver contains a enable pin (RE) which enables the receiver when a logic LOW is asserted. A logic HIGH will tri-state the receiver output and the inputs will maintain at least 120k impedance. The receiver can operate to at least 1Mbps. The receiver also contains a fail-safe feature which outputs a logic HIGH when the inputs are open as in a disconnected cable. SHUTDOWN MODE The SP481R includes a shutdown function to reduce power consumption. The shutdown is activated by simultaneously applying a logic LOW to DE and a logic HIGH to RE. While in the shutdown mode, the power supply current is typically less than 1A. The driver outputs are disabled and are at a high impedance state determined by the receiver input impedance which should be at least 120k. The receiver output is at also at high impedance during shutdow. Output leakage current when the receiver is disabled is under 1A. SP485RDS/08 SP485R RS-485 Serial Transceiver (c) Copyright 2000 Sipex Corporation 6 PACKAGE: 8-PIN 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 O 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 L C eA = 0.300 BSC (7.620 BSC) 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) 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) SP485RDS/08 SP485R RS-485 Serial Transceiver (c) Copyright 2000 Sipex Corporation 7 PACKAGE: 8-PIN PLASTIC SMALL OUTLINE (SOIC) (NARROW) EH B h x 45 D A O e 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) SP485RDS/08 SP485R RS-485 Serial Transceiver (c) Copyright 2000 Sipex Corporation 8 ORDERING INFORMATION Model Temperature Range Package Types SP481RCP ........................................................................ 0C to +70C ...................................................................................... 8-pin Plastic DIP SP481RCN ........................................................................ 0C to +70C ...................................................................... 8-pin Plastic Narrow SOIC SP485RCP ........................................................................ 0C to +70C ...................................................................................... 8-pin Plastic DIP SP485RCN ........................................................................ 0C to +70C ...................................................................... 8-pin Plastic Narrow SOIC Please consult the factory for pricing and availability on a Tape-On-Reel option. Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com 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 herein; neither does it convey any license under its patent rights nor the rights of others. SP485RDS/08 SP485R RS-485 Serial Transceiver (c) Copyright 2000 Sipex Corporation 9 |
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