SP485REN-L/TR

SP485R 1/10th Unit Load RS-485 Transceiver FEATURES • Allows Over 400 Transceivers On A Transmission Line (1/10th Unit Load) • High Impedance on Receiver Inputs (RIN = 150kΩ typical) • Half-Duplex Configuration Consistent With Industry Standard Pinout • -7V to +12V Common Mode Input Voltage Range • Low Power Consumption (250mW) • Separate Driver and Receiver Enable DESCRIPTION The SP485R is a pin-to-pin equivalent to our existing SP485 product and offers a 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. The device is packaged in a 8-pin plastic DIP or 8-pin narrow SOIC. Figure 1. Typical Application Circuit SP485R_101_013020 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. Power Dissipation 8-pin NSOIC.................................................1000mW (ØJA = 62ºC/W) 8-pin PDIP....................................................1000mW (ØJA = 62ºC/W) VCC.......................................................................+7V Storage Temperature.......................-65˚C to +150˚C ELECTRICAL CHARACTERISTICS Typically 25ºC @ VCC = +5V unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS LOGIC INPUTS VIL VIH 0.8 2.0 Volts Volts LOGIC OUTPUTS VOL VOH 0.4 2.4 Volts IOUT = -3.2mA Volts IOUT = 1.0mA RS-485 DRIVER DC Characteristics Open Circuit Voltage Differential Output Voltage 1.5 Balance Common-Mode Output Output Current 6.0 Volts 5.0 Volts RL = 54Ω, CL = 50pF +/-0.2 Volts |VT| - |VT| 3.0 Volts 28.0 Short Circuit Current +/-250 mA RL = 54Ω mA Terminated in -7V to +12V RS-485 DRIVER AC Characteristics Maximum Data Rate 5 Mbps Output Transition Time 30 Propagation Delay, tPLH 60 Propagation Delay, tPHL Driver Output Skew RL = 54Ω, ns Rise/fall time, 10% to 90% 100 ns See Figures 4 & 6, RDIFF = 54Ω, CL1 = CL2 = 100pF 60 100 ns See Figures 4 & 6, RDIFF = 54Ω, CL1 = CL2 = 100pF 5 15 ns see Figures 4 and 6, tSKEW = |tDPHL - tDPLH| 0.4 Volts RS-485 RECEIVER DC Characteristics Output Voltage Low, VOL Output Voltage High, VOH Tri-State Output Current 2.4 Volts +/-1 µA 0.4V ≤ VOUT ≤ 2.4V; RE = Vcc SP485R_101_013020 2 ELECTRICAL CHARACTERISTICS Typically 25ºC @ VCC = +5V unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS +12.0 Volts +/-0.2 Volts -7V ≤ VCM ≤ +12V kΩ -7V ≤ VCM ≤ +12V RS-485 RECEIVER DC Characteristics (continued) Common Mode Range -7.0 Receiver Sensitivity Input Impedance 120 150 RS-485 RECEIVER AC Characteristics Maximum Data Rate 1 Mbps Propagation Delay; tPHL 1200 ns See Figures 4 & 8, RDIFF = 54Ω, CL1 = CL2 = 100pF Propagation Delay; tPLH 1200 ns See Figures 4 & 8, RDIFF = 54Ω, CL1 = CL2 = 100pF ns See Figures 4 & 8, RDIFF = 54Ω, CL1 = CL2 = 100pF, tSKEW = |tPHL - tPLH| Differential Receiver Skew 60 RS-485 DRIVER Enable / Disable Time Driver Enable to Output Low 40 500 ns CL = 15pF, see Figures 5 and 7, S1 closed Driver Enable to Output High 40 500 ns CL = 15pF, see Figures 5 and 7, S2 closed Driver Disable Time from Low 40 500 ns CL = 15pF, see Figures 5 and 7, S1 closed Driver Disable Time from High 40 500 ns CL = 15pF, see Figures 5 and 7, S2 closed Receiver Enable to Output Low 40 500 ns CL = 15pF, see Figures 3 and 9, S1 closed Receiver Enable to Output High 40 500 ns CL = 15pF, see Figures 3 and 9, S2 closed Receiver Disable from Low 40 500 ns CL = 15pF, see Figures 3 and 9, S1 closed Receiver Disable from High 40 500 ns CL = 15pF, see Figures 3 and 9, S1 closed RS-485 RECEIVER Enable / Disable Time POWER REQUIREMENTS Supply Voltage VCC +5.25 Volts Supply Current ICC, No Load +4.75 300 500 µA RE = Vcc or 0V, DE = 0V Supply Current ICC, No Load 500 900 µA RE = Vcc or 0V, DE = Vcc +70 ºC ENVIRONMENTAL Operating Temperature Commercial (..C..) 0 Industrial (..E..) -40 +85 ºC Storage Temperature -65 +150 ºC SP485R_101_013020 3 PIN FUNCTION Pin 1 - RO - Receiver Output Pin 2 - RE - Receiver Output Enable Active LOW Pin 3 - DE - Driver Output Enable Active HIGH Pin 4 DI - Driver Input Pin 5 - GND - Ground Connection Pin 6 - A - Driver Output / Receiver input Non-Inverting Pin 7 - B - Driver Output / Receiver Input Inverting Pin 8 - Vcc - Positive Supply 4.75V ≤ Vcc ≤ 5.25V RECEIVER INPUT GRAPH Standard SP485 Reciever SP485R Reciever +1.0mA -7V +100µA -7V -3V +12V +6V -0.6mA -3V +6V -60µA 1 Unit Load Maximum Input Current versus voltage. (Shaded region) +12V 1/10 Unit Load Maximum Input Current versus voltage. (Shaded region) TEST CIRCUITS A R VOD R 1kΩ S2 B Figure 2. Driver DC Test Load Circuit DI A B VCC S1 CRL VOC 1kΩ Test Point Receiver Output CL1 RL CL2 A B Figure 3. Receiver Timing Test Load Circuit Output Under Test RO 15pF 500Ω S1 VCC CL S2 Figure 4. RS-485 Driver/Receiver Timing Test Figure 5. Driver Timing Test Load #2 Circuit SP485R_101_013020 4 SWITCHING WAVEFORMS DRIVER INPUT f ≥ 1MHz; t R ≤ 10ns; t F ≤ 10ns +3V 1.5V 0V DRIVER OUTPUT 1.5V t PHL t PLH B VO 1/2VO A 1/2VO t DPLH DIFFERENTIAL VO+ 0V OUTPUT VA – VB VO– t DPHL tF tR t SKEW = |t DPLH - t DPHL | Figure 6. Driver Propagation Delays DE A, B A, B f = 1MHz; t R < 10ns; t F < 10ns +3V 1.5V 0V 1.5V t LZ t ZL 5V 2.3V VOL VOH 2.3V 0V Output normally LOW 0.5V Output normally HIGH 0.5V t ZH t HZ Figure 7. Driver Enable and Disable Times A– B f = 1MHz; t R ≤ 10ns ; t F ≤ 10ns VOD2 + 0V VOD2 – RECEIVER OUT VOH VOL 0V INPUT 1.5V 1.5V OUTPUT t PHL t PLH Figure 8. Receiver Propagation Delays RE +3V RECEIVER OUT 0V 5V VIL 1.5V f = 1MHz; t ≤ 10ns; t ≤ 10ns R F t ZL 1.5V VIH RECEIVER OUT 0V 1.5V 1.5V t LZ Output normally LOW 0.5V Output normally HIGH 0.5V t ZH t HZ Figure 9. Receiver Enable and Disable Times SP485R_101_013020 5 DESCRIPTION transceivers with an input impedance of at least 120kΩ in parallel along with the two 125Ω cable termination resistors on each end. 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 original RS-485 specifcation. The receiver contains an 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 120kΩ impedance. The reciever can operate to at least 1Mbps The RS-485 standard is ideal for multi-drop applications where one bus can contain many drivers and/or receivers.The RS-485 standard implementation 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 4000 feet. The SP485R exceeds the standard by allowing up to 400 receivers to share the bus The receiver also contains a fail-safe feature which outputs a logic HIGH when the inputs are open as in a disconnected cable. DRIVERS The driver output complies with the RS485 electrical characteristics as specified by the standard. The output swings from 0V to Vcc and maintains greater than +1.5V with a 54Ω 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 100Ω 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 logic LOW. The outputs during the tri-state condition are at high impedance (>100kΩ). 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 the same bus. The SP485R allows over 400 transceivers on the same bus due to its high impedance of at least 120kΩ. 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 54Ω from the 320 SP485R_101_013020 6 SP485R_101_013020 7 8-pin PDIP version is obsolete SP485R_101_013020 8 ORDERING INFORMATION(1), (3) PART NUMBER TEMPERATURE RANGE PACKAGE PACKAGING METHOD LEAD-FREE(2) SP485RCN-L/TR 0°C to 70°C 8-pin NSOIC Tape and Reel Yes SP485REN-L/TR -40°C to 85°C 8-pin NSOIC Tape and Reel Yes NOTES: 1. Refer to www.maxlinear.com/SP485R for most up to date Ordering Information. 2. Visit www.maxlinear.com for additional information on Environmental Rating. 3. 8-pin PDIP version is obsolete. REVISION HISTORY DATE REVISION 06/21/04 -- DESCRIPTION 07/23/09 1.0.0 Convert to Exar Format. Update ordering information as a result of discontinued Lead type package options per PDN 081126-01. Remove all reference to the discontinued SP481R. 01/30/20 1.0.1 Update to MaxLinear logo. Update ordering information. 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