SP3494EN-L

SP3494 Data Sheet 3.3V Low Power RS-485 / RS-422 Transceiver General Description Features The SP3494 device is a 3.3V low power half-duplex transceiver that meets the specifications of the RS-485 and RS-422 serial protocols. This device is pin-to-pin compatible with the MaxLinear SP481E device and other popular industry standard devices. The SP3494 features the MaxLinear BiCMOS process, allowing low power operation without sacrificing performance. The partially slew-rate limited drivers minimize EMI and reduce reflections caused by improperly terminated cables allowing error-free data transmission. The SP3494 is a half-duplex partially slew-rate limited transceiver that will deliver a data transmission rate up to 2.5Mbps. The SP3494 is equipped with a low-power shutdown mode and driver / receiver high-Z enable lines. ■ ■ ■ ■ ■ ■ ■ ■ Operates from a single 3.3V supply Interoperable with 5.0V logic ±200mV receiver input sensitivity -7V to +12V common-mode input voltage range Allows up to 32 transceivers on the serial bus Driver / receiver enable lines 10μA low-power shutdown mode Compatibility with the MAX3486 and 75176 industry standard pinout Ordering Information - page 8 Block Diagram Figure 1: SP3494 • www.maxlinear.com• Rev 1.0.2 SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Data Sheet Revision History Revision History Revision Release Date Change Description -- 10/15/02 Legacy Sipex Datasheet 1.0.0 7/10/12 Convert to Exar Format. Update ordering information and add new Figure 8 - Driver Short Circuit Current Limit Test Circuit. Remove EOL device SP3493. 1.0.1 9/7/17 Update to MaxLinear logo. Remove GND from Differential Output Voltage min (page 2), correct part number (SP3485 Receiver, page 3). Added maximum junction temperature, package power dissipation and ESD rating. Update format and ordering information table. 1.0.2 3/4/19 Update to MaxLinear format. Update pin compatibility references. 3/4/19 Rev 1.0.2 ii SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Data Sheet Table of Contents Table of Contents General Description............................................................................................................................................. i Features............................................................................................................................................................... i Block Diagram..................................................................................................................................................... i Specifications ..................................................................................................................................................... 1 Absolute Maximum Ratings...........................................................................................................................................1 ESD Ratings ..................................................................................................................................................................1 Operating Conditions.....................................................................................................................................................1 Electrical Characteristics ...............................................................................................................................................2 Pin Information ................................................................................................................................................... 3 Pin Configuration .......................................................................................................................................................... 3 Pin Descriptions ........................................................................................................................................................... 3 Test Circuits ........................................................................................................................................................ 4 Switching Waveforms ........................................................................................................................................ 5 Description .......................................................................................................................................................... 6 Driver ............................................................................................................................................................................ 6 Receiver ....................................................................................................................................................................... 6 Mechanical Dimensions ..................................................................................................................................... 7 Ordering Information.......................................................................................................................................... 8 3/4/19 Rev 1.0.2 iii SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Data Sheet List of Figures List of Figures Figure 1: SP3494................................................................................................................................................... i Figure 2: SP3494 Pinout (Top View) .................................................................................................................... 3 Figure 3: Driver DC Test Load Circuit................................................................................................................... 4 Figure 4: Driver Propagation Delay Test Circuit ................................................................................................... 4 Figure 5: Driver Differential Output Delay and Transition Time Circuit................................................................. 4 Figure 6: Driver Enable and Disable Timing Circuit Output High.......................................................................... 4 Figure 7: Driver Enable and Disable Timing Circuit Output Low .......................................................................... 4 Figure 8: Receiver Propagation Delay Test Circuit............................................................................................... 4 Figure 9: Receiver Enable and Disable Timing Circuit ......................................................................................... 4 Figure 10: Driver Short Circuit Current Limit Test................................................................................................. 4 Figure 11: Driver Propagation Delay Waveforms ................................................................................................. 5 Figure 12: Driver Differential Output Delay and Transition Time Waveforms....................................................... 5 Figure 13: Driver Enable and Disable Timing Waveforms.................................................................................... 5 Figure 14: Receiver Propagation Delay Waveforms............................................................................................. 5 Figure 15: Receiver Enable and Disable Waveforms ........................................................................................... 5 Figure 16: Mechanical Dimensions, NSOIC8 ....................................................................................................... 7 3/4/19 Rev 1.0.2 iv SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Data Sheet List of Tables List of Tables Table 1: Absolute Maximum Ratings .................................................................................................................... 1 Table 2: ESD Ratings ........................................................................................................................................... 1 Table 3: Operating Conditions .............................................................................................................................. 1 Table 4: Electrical Characteristics ........................................................................................................................ 2 Table 5: Pin Descriptions...................................................................................................................................... 3 Table 6: Transmit Function Truth Table................................................................................................................ 6 Table 7: Receive Function Truth Table................................................................................................................. 6 Table 8: Ordering Information............................................................................................................................... 8 3/4/19 Rev 1.0.2 v SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Data Sheet Specifications Specifications Absolute Maximum Ratings Important: 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 ratings conditions for extended periods of time may affect reliability. Table 1: Absolute Maximum Ratings Parameter Minimum VCC Maximum Units 6.0 V Input Voltages Drivers -0.3 6 V Receivers -14 14 V Drivers -14 14 V Receivers -0.3 6 V Output Voltages Temperature Storage temperature -65 Maximum junction temperature, TJ 150 °C 125 °C 600 mW Power Dissipation 8-pin NSOIC ѲJA ESD Ratings Table 2: ESD Ratings Parameter Value Units HBM (Human Body Model) ±2 kV Value Units 128.4 °C/W Operating Conditions Table 3: Operating Conditions Parameter Package Power Dissipation 8-pin NSOIC 3/4/19 Rev 1.0.2 1 SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Data Sheet Electrical Characteristics Electrical Characteristics TAMB = TMIN to TMAX and VCC = 3.3V ±5% unless otherwise noted. Table 4: Electrical Characteristics Parameter Test Condition Minimum Typical Maximum Units SP3494 Driver DC Characteristics Differential output voltage Unloaded; R = ∞Ω, Figure 1 Differential output voltage With load; R = 50Ω (RS-422); Figure 1 Differential output voltage With load; R = 27Ω (RS-485); Figure 1 Change in magnitude of driver differential output voltage for complimentary states VCC V 2 VCC V 1.5 VCC V R = 27Ω or R = 50Ω; Figure 1 0.2 V Driver common-mode output voltage R = 27Ω or R = 50Ω; Figure 1 3 V Input high voltage Applies to DE, DI, RE Input low voltage 2.0 V Applies to DE, DI, RE 0.8 V Input current Applies to DE, DI, RE ±10 uA Driver short circuit current VOUT = HIGH -7V ≤ VO ≤ +12V; Figure 8 ±250 mA Driver short circuit current VOUT = LOW -7V ≤ VO ≤ +12V; Figure 8 ±250 mA SP3494 Driver AC Characteristics Maximum data rate RE = VCC, DE = VCC 2.5 Driver input to output, tPLH Figures 2 & 9 20 45 75 ns Driver input to output, tPHL Figures 2 & 9 20 45 75 ns Differential driver skew |tDO1- tDO2|, Figures 2 and 10 10 Driver rise or fall time From 10% - 90%; Figures 3 and 10 30 70 ns Driver enable to output high Figures 4 and 11 52 120 ns Driver enable to output low Figures 5 and 11 60 120 ns Driver disable time from low Figures 5 and 11 40 120 ns Driver disable time from high Figures 4 and 11 60 120 ns 0.2 V Mbps ns SP3494 Receiver DC Characteristics Differential input threshold -7V ≤ VCM ≤ 12V Input hysteresis VCM = 0V Output voltage HIGH VID = +200mV, -1.5mA Output voltage LOW VID = -200mV, 2.5mA 0.4 V Three-state (high impedance) output current 0V ≤ VO ≤ VCC; RE = VCC ±1 uA Input resistance -7V ≤ VCM ≤ 12V Input current (A, B); VIN = 12V DE = 0V, VCC = 0V or 3.6V, VIN = 12V 1.0 mA Input current (A, B); VIN = -7V DE = 0V, VCC = 0V or 3.6V, VIN = -7V -0.8 mA Short circuit current 0V ≤ VCM ≤ VCC 60 mA 3/4/19 -0.2 20 VCC - 0.4 12 7 Rev 1.0.2 mV V 15 kΩ 2 SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Pin Information Table 4: (Continued) Electrical Characteristics Parameter Test Condition Minimum Typical Maximum Units Maximum data rate RE = 0V, DE = 0V 2.5 Receiver input to output, tPLH Figures 6 and 12 40 70 100 ns Receiver input to output, tPHL Figures 6 and 12 40 70 100 ns Differential receiver skew tRSKEW = |tRPHL- tRPLH|, Figures 6 and 12 10 Receiver enable to output low Figures 7 and 13, S1 closed, S2 open 35 60 ns Receiver enable to output high Figures 7 and 13, S2 closed, S1 open 35 60 ns Receiver disable from low Figures 7 and 13, S1 closed, S2 open 35 60 ns Receiver disable from high Figures 7 and 13, S2 closed, S1 open 35 60 ns 75 200 ns SP3494 Receiver AC Characteristics Mbps ns SP3494 Shutdown Timing Time to shutdown RE = 3.3V, DE =0V 50 Driver enable from shutdown to output high Figures 4 and 11 65 150 ns Driver enable from shutdown to output low Figures 5 and 11 65 150 ns Receivers enabled from shutdown to output high Figures 7 and 13, S2 closed, S1 open 50 200 ns Receivers enabled from shutdown to output low Figures 7 and 13, S1 closed, S2 open 50 200 ns Supply current, no load RE, DI = 0V or VCC ; DE = VCC 1000 2000 uA Supply current, no load RE = 0V, DI = 0V or VCC, DE = 0V 800 1500 uA Shutdown mode DE = 0V, RE = VCC 10 uA Power Requirements Pin Information Pin Configuration Pin Descriptions Table 5: Pin Descriptions Figure 2: SP3494 Pinout (Top View) 3/4/19 Pin Number Pin Name Description 1 RO Receiver output 2 RE Receiver Output Enable Active LOW 3 DE Driver Output Enable Active HIGH 4 DI Driver Input 5 GND Ground Connection 6 A Non-Inverting Driver Output / Receiver Input 7 B Inverting Driver Output / Receiver Input 8 VCC Positive Supply 3.3V ±5% Rev 1.0.2 3 SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Test Circuits Test Circuits Figure 3: Driver DC Test Load Circuit Figure 4: Driver Propagation Delay Test Circuit Figure 5: Driver Differential Output Delay and Transition Time Circuit Figure 6: Driver Enable and Disable Timing Circuit, Output High Figure 7: Driver Enable and Disable Timing Circuit, Output Low Figure 8: Receiver Propagation Delay Test Circuit Figure 9: Receiver Enable and Disable Timing Circuit Figure 10: Driver Short Circuit Current Limit Test 1. The input pulse is supplied by a generator with the following characteristics: PRR = 250kHz, 50% duty cycle, tR < 6.0ns, ZO = 50Ω 2. CL includes probe and stray capacitance. 3/4/19 Rev 1.0.2 4 SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Data Sheet Switching Waveforms Switching Waveforms Figure 11: Driver Propagation Delay Waveforms Figure 12: Driver Differential Output Delay and Transition Time Waveforms Figure 13: Driver Enable and Disable Timing Waveforms Figure 14: Receiver Propagation Delay Waveforms Figure 15: Receiver Enable and Disable Waveforms 3/4/19 Rev 1.0.2 5 SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Description Description The SP3494 is a 3.3V low power half-duplex transceiver that meets the electrical specifications of the RS-485 and RS-422 serial protocols. This device is pin-to-pin compatible with the MaxLinear SP481E devices as well as other popular industry standard devices. The SP3494 feature Maxlinear’s BiCMOS process allowing low power operation without sacrificing performance. The SP3494 has a partially slew rate limited driver with a data transmission rate of 2.5Mbps. Receiver Driver The receiver of the SP3494 has an enable control line which is active LOW. A logic LOW on RE (pin 2) of the SP3494 will enable the differential receiver. A logic HIGH on RE (pin 2) will disable the receiver. The driver outputs of the SP3494 are differential outputs. The typical voltage output swing with no load will be 0 volts to VCC. With worst case loading of 54Ω across the differential outputs, the driver can maintain greater than 1.5V voltage levels. The SP3494 driver has an enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differential driver outputs. A logic LOW on the DE (pin 3) will force the driver outputs to high impedance (high-Z). The SP3494 driver will operate up to 2.5Mbps. In addition to adhering to the 250mA ISC maximum limit on the driver output, the driver output short-circuit protection will allow the device to withstand an infinite short circuit over the -7.0V to 12V common mode range without damage. Table 6: Transmit Function Truth Table Inputs Outputs RE DE DI Line Condition B A X 1 1 No Fault 0 1 X 1 0 No Fault 1 0 X 0 X X Z Z 3/4/19 The receiver has differential inputs with an input sensitivity of ±200mV. Input impedance of the receiver is typically 15kΩ (12kΩ minimum). A wide common mode range of -7V to 12V allows for large ground potential differences between systems. The receiver is equipped with a fail-safe feature which guarantees that the receiver output will be in a high state when the input is left unconnected. The receiver of the SP3494 operates up to 2.5Mbps. The SP3494 is 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 3) and a logic HIGH on RE (pin 2) will put the SP3494 into shutdown. In shutdown, the supply current will drop to less than 10µA. Table 7: Receive Function Truth Table Inputs Output RE DE A-B R 0 0 0.2V 1 0 0 -0.2V 0 0 0 Inputs Open 1 1 0 X Z Rev 1.0.2 6 SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Mechanical Dimensions Mechanical Dimensions NSOIC8 Top View Front View Side View Drawing No: Revision: POD-00000108 A Figure 16: Mechanical Dimensions, NSOIC8 3/4/19 Rev 1.0.2 7 SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Data Sheet Ordering Information Ordering Information Table 8: Ordering Information(1) Ordering Part Number Operating Temperature Range SP3494CN-L/TR 0°C to 70°C SP3494EN-L SP3494EN-L/TR Lead-Free Package Packaging Method Reel Yes(2) -40°C to 85°C 8-pin NSOIC Tube Reel 1. Refer to www.maxlinear.com/SP3494 for most up-to-date Ordering Information. 2. Visit www.maxlinear.com for additional information on Environmental Rating. 3/4/19 Rev 1.0.2 8 SP3494 3.3V Low Power RS-485 / RS-422 Transceiver Data Sheet Disclaimer MaxLinear, Inc. 5966 La Place Court, Suite 100 Carlsbad, CA 92008 760.692.0711 p. 760.444.8598 f. www.maxlinear.com The content of this document is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by MaxLinear, Inc. MaxLinear, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide. Complying with all applicable copyright laws is the responsibility of the user. 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