SP481R/SP485R. 1/10th Unit Load RS-485 Transceiver. Now Available in Lead Free Packaging D SP485

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1 SP481R/SP485R 1/10th Unit Load RS-485 Transceiver FTURS llows Over 400 Transceivers On Transmission Line (1/10th Unit Load) High Impedance on Receiver Inputs (R IN = 150kΩ typical) Half-uplex Configuration Consistent With Industry Standard Pinout 7V to +12V Common Mode Input Voltage Range Includes Shutdown Mode (I CC < 10µ) (For SP481R Only) Low Power Consumption (250mW) Separate river and Receiver nale Now vailale in Lead Free Packaging SCRIPTION The SP481R and SP485R are pin-to-pin equivalent with our existing SP485 product and contain enhancements such as higher S 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. ach device is packaged in an 8-pin plastic IP or 8-pin narrow SOIC package. The SP481R offers a shutdown feature via the enale pins which will reduce the supply current (I CC ) elow 0.5µ typical. TYPICL PPLICTION CIRCUIT RO 1 R 8 V CC R 2 7 B 3 6 I 4 SP485 5 GN Top View 1

2 BSOLUT MXIMUM RTINGS These are stress ratings only and functional operation of the device at these ratings or any other aove those indicated in the operation sections of the specifications elow is not implied. xposure to asolute maximum rating conditions for extended periods of time may affect reliaility. V CC...+7V Storage Temperature C to +150 C Power issipation 8-pin Plastic IP mW 8-pin Plastic N-SOIC mW Package erating: 8-pin Plastic IP ø J...62 C/W 8-pin Plastic N-SOIC ø J...62 C/W Typically 25 Vcc = +5V unless otherwise noted. LCTRICL CHRCTRISTICS MIN. TYP. MX. UNITS CONITIONS LOGIC INPUTS V IL 0.8 Volts V IH 2.0 Volts LOGIC OUTPUTS V OL 0.4 Volts I OUT = -3.2m V OH 2.4 Volts I OUT = 1.0m RS-485 RIVR C Characteristics TTL Input Levels V IL 0.8 Volts V IH 2.0 Volts Outputs Open Circuit Voltage 6.0 Volts ifferential Output Volts R L =54Ω, C L =50pF Balance ±0.2 Volts V T - V T Common-Mode Output 3.0 Volts Output Current 28.0 m R L =54Ω Short Circuit Current ±250 m Terminated in 7V to +12V C Characteristics Maximum ata Rate 5 Mps R L =54Ω Output Transition Time 30 ns Rise/fall time, 10% 90% Propagation elay See Figures 3 and 5 t PHL ns R IFF =54Ω, C L1 =100pF ns R IFF =54Ω, C L1 =100pF river Output Skew 5 15 ns see Figure 3 and 5, t SKW = - t PHL RS-485 RCIVR C Characteristics TTL Output Levels V OL 0.4 Volts V OH 2.4 Volts Tri-State Output Current ±1 µ 0.4V V OUT 2.4V; R = V CC Inputs Common Mode Range Volts Receiver Sensitivity ±0.2 Volts 7V V CM +12V Input Impedance kω 7V V CM +12V 2

3 Typically 25 Vcc = +5V unless otherwise noted. MIN. TYP. MX. UNITS CONITIONS C Characteristics Maximum ata Rate 1 Mps Propagation elay See Figures 3 and 7 t PHL 1200 ns R IFF =54Ω, C L1 =100pF 1200 ns R IFF =54Ω, C L1 =100pF ifferential Receiver Skew 60 ns t PHL ; R IFF =54Ω, C L1 =100pF, see Figures 3 and 7 SHUTOWN TIMING (SP481R) Time to Shutdown ns R = V CC, = RS-485 river nale Time See Figures 4 and 6 nale to Low ns C L =15pF, S 1 nale to High ns C L =15pF, S 2 isale Time See Figures 4 and 6 isale From Low ns C L =15pF, S 1 isale From High ns C L =15pF, S 2 RS-485 Receiver nale Time See Figures 2 and 8 nale to Low ns C L =15pF, S 1 nale to High ns C L =15pF, S 2 isale Time See Figures 2 and 8 isale From Low ns C L =15pF, S 1 isale From High ns C L =15pF, S 2 POWR RQUIRMNTS Supply Voltage V CC Volts Supply Current I CC No Load µ R = V CC or, = No Load µ R = V CC or, = V CC Supply Current in Shutdown µ R = V CC, = OV NVIRONMNTL Operating Temperature Commercial (..C..) C Industrial (...) C Storage Temperature C LCTRICL CHRCTRISTICS RCIVR INPUT GRPH Standard SP485R Reciever +1.0m SP485R Reciever +100µ -7V -3V -7V -3V -0.6 m +6V +12V 1 Unit Load Maximum Input Current versus voltage. (Shaded region) -60µ +6V +12V 1/10 Unit Load Maximum Input Current versus voltage. (Shaded region) 3

4 TST CIRCUITS R Receiver Test Point Output S 1 1kΩ V CC V O C RL 1kΩ B R V OC S 2 Figure 1. river C Test Load Circuit Figure 2. Receiver Timing Test Load Circuit I B R L C L1 C L2 B RO 15pF Output Under Test C L 500Ω S 1 V CC S 2 Figure 3. river/receiver Timing Test Circuit Figure 4. river Timing Test Load #2 Circuit SWITCHING WVFORMS I RIVR OUTPUT +3V B IFFRNTIL V O + OUTPUT V V B V O f = 1MHz; t R < 10ns; t F < 10ns 1.5V 1.5V V 1/2V O 1/2V O O t R t PHL t PHL t F t SKW = - t PHL Figure 5. river Propagation elays 4

5 +3V f = 1MHz; t R < 10ns; t F < 10ns 1.5V 1.5V t ZL t LZ 5V, B 2.3V V OL Output normally LOW 0.5V, B V OH 2.3V t ZH Output normally HIGH 0.5V t HZ Figure 6. river nale and isale Times f = 1MHz; t R < 10ns; t F < 10ns V 02 + B V 02 INPUT V OH RCIVR OUT 1.5V OUTPUT 1.5V V OL t PHL t SKW = t PHL - Figure 7. Receiver Propagation elays +3V R 1.5V f = 1MHz; t 1.5V R < 10ns; t F < 10ns t ZL t LZ 5V RCIVR OUT 1.5V Output normally LOW V 0.5V IL V IH RCIVR OUT 1.5V t ZH Output normally HIGH 0.5V t HZ Figure 8. Receiver nale and isale Times 5

6 GNRL SCRIPTION 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 us compared to the orignal RS-485 specification. The RS-485 standard is ideal for multi-drop applications where one us can contain many drivers and/or receivers. The RS-485 standard implementation allows up to 32 transceivers to e connected on to the data us. RS-485 is also specified for driving higher speeds over long cale lengths of up to 4,000 feet. The SP485R and SP481R exceed the standard allowing up to 400 receivers to share a us. RIVRS The driver output complies with the RS-485 electrical characteristics as specified y the standard. The output swings from to V CC and maintains greater than +1.5V with a 54Ω load attached etween the two outputs. In adhering to the RS-485 specification, the driver outputs inherently comply with the RS-422 standard. With a load of 100Ω etween the two outputs, the driver can sustain at least +2.. with the two 125Ω cale termination resistors on each end. The receiver contains a enale pin (R) which enales the receiver when a logic LOW is asserted. logic HIGH will tri-state the receiver output and the inputs will maintain at least 120kΩ impedance. The receiver can operate to at least 1Mps. The receiver also contains a fail-safe feature which outputs a logic HIGH when the inputs are open as in a disconnected cale. SHUTOWN MO The SP481R includes a shutdown function to reduce power consumption. The shutdown is activated y simultaneously applying a logic LOW to and a logic HIGH to R. While in the shutdown mode, the power supply current is typically less than 1µ. The driver outputs are disaled and are at a high impedance state determined y the receiver input impedance which should e at least 120kΩ. The receiver output is at also at high impedance during shutdow. Output leakage current when the receiver is disaled is under 1µ. The driver contains an enale pin () which tri-states the output when is a logic LOW. The outputs during the tri-stated condition are at a high impedance (>100kΩ). logic HIGH enales the driver for normal operation. The driver can operate to at least 5Mps. RCIVRS The SP485R receiver has differential inputs with an input sensitivity of lower than ±200mV. s mentioned aove, the RS-485 specification allows up to 32 transceivers on a the same us. The SP485R allows over 400 transceivers on the same us due to the high input impedance of at least 120kΩ. This higher capacity allows more components to e attached to the same us without degrading the signal quality. The drivers are still ale to drive an equivalent 54Ω from the 320 transceivers with an input impedance of at least 120kΩ in parallel along 6

7 PCKG: 8 PIN PIP INX R N N/2 e c 1 eb 1 3 e 2 L 2 8 PIN PIP JC MS-001 (B) Variation 1 imensions in inches MIN NOM MX c c 1 1 e e eb L BSC.300 BSC PIN PIP 7

8 PCKG: 8 PIN NSOIC e /2 1 1/2 S VIW C INX R (/2 X 1/2) 1 TOP VIW Ø1 Seating Plane Ø1 L L2 Gauge Plane Ø L1 VIW C 2 STING PLN 1 SI VIW IMNSIONS Minimum/Maximum (mm) 8 Pin NSOIC (JC MS-012, - VRITION) WITH PLTING COMMON HIGHT IMNSION SYMBOL MIN NOM MX c BSC 6.00 BSC BSC e 1.27 BSC L L RF L BSC Ø Ø1 0º 5º - - 8º 15º c BS MTL CONTCT R PCKG: 8 PIN NSOIC 8

9 Part Numer Temperature Range Package Types SP481RCP... 0 C to +70 C... 8 Pin PIP SP481RCN... 0 C to +70 C... 8 Pin NSOIC SP481RCN/TR... 0 C to +70 C... 8 Pin NSOIC SP481RP C to +85 C... 8 Pin PIP SP481RN C to +85 C... 8 Pin NSOIC SP481RN/TR C to +85 C... 8 Pin NSOIC SP485RCP... 0 C to +70 C... 8 Pin PIP SP485RCN... 0 C to +70 C... 8 Pin NOIC SP485RCN/TR... 0 C to +70 C... 8 Pin NOIC SP485RP C to +85 C... 8 Pin PIP SP485RN C to +85 C... 8 Pin NOIC SP485RN/TR C to +85 C... 8 Pin NOIC vailale in lead free packaging. To order add -L suffix to part numer. xample: SP485RN/TR = standard; SP485RN-L/TR = lead free /TR = Tape and Reel Pack quantity is 2,500 for NSOIC. ORRING INFORMTION RVISION HISTORY T RVISION SCRIPTION 6/21/04 dded extended temp range and tape and reel part numers. Updated packaging specs. Corporation NLOG XCLLNC Sipex Corporation Headquarters and Sales Office 233 South Hillview rive Milpitas, C TL: (408) FX: (408) Sipex Corporation reserves the right to make changes to any products descried herein. Sipex does not assume any liaility arising out of the application or use of any product or circuit descried herein; neither does it convey any license under its patent rights nor the rights of others. 9