HG3485EIM/TR

HG3485 ±15kV ESD-Protected ,Fail-Safe,High-Speed(10Mbps) Slew-Rate-Limited RS-485 Transceivers General Description The HG3485 is +/- 15kV electrostatic discharge (ESD) protected, high-speed transceiver for RS-485 communication that contain one driver and one receiver. The device features fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means that the receiver output will be logic-high even if all transmitters on a terminated bus are disabled. The HG3485 driver slew rate is not limited, making transmit speeds up to 10Mbps possible. All transmitter outputs and receiver inputs are protected to +/- 15kV using the Human Body Model. The transceiver typically draws 500 micron ampere of supply current when unloaded, or when fully loaded with the driver disabled. This device has a 1-unit-load receiver input impedance that allows up to 32 transceivers on the bus. The HG3485 is intended for half-duplex communications. Features  True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compatibility  Low Quiescent Supply Current: 500uA  Allow Up to 32 Transceivers on the Bus  1nA Low-Current Shutdown Mode Applications I/O ESD protection Human Body Model: ±15kV IEC 61000-4-2： Contact discharge: ±12kV Air discharge: ±15kV  RS-485 Communications  Level Translators  Motor Controller  Industrial Control Local Area Networks  Energy Meter Networks  Power Inverters  Building Automation Networks  Telecommunications Equipment PIN Configuration DIP8/SOP8 HG3485 Pin figure Ordering Information DEVICE Package Type MARKING Packing Packing Qty HG3485EIN DIP8 HG3485 TUBE 2000/box HG3485EIM/TR SOP8 HG3485 REEL 2500/reel http://www.hgsemi.com.cn 1 2019 JUN V2.0 HG3485 Pin Description PIN NAME 1 RO 2 RE FUNCTION Receiver Output. When RE is low and if A - B ≥　-50mV, RO will be high; if A- B ≤ -200mV, RO will be low. Receiver Output Enable. Drive 3 DE high. Drive RE low to enable RO; RO is high impedance when RE RE is high and DE low to enter low-power shutdown mode. Driver Output Enable. Drive DE high to enable driver outputs. These outputs are high impedance when DE is low. Drive RE high and DE low to enter low-power shutdown mode. Driver Input. With DE high, a low on DI forces non-inverting output low and inverting 4 DI output high. Similarly, a high on DI forces non-inverting output high and inverting output low. 5 GND Ground 6 A Non-inverting Receiver Input and Non-inverting Driver Output. 7 B Inverting Receiver Input and Inverting Driver Output. 8 VCC Positive Supply 3.0V ≤ VCC ≤ 　3.6V. ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL NUM UNITS Supply Voltage (VCC) VCC +6.5 V -0.3 to VCC+0.3 V Control Input Voltage ( R E , DE) RE , DE Driver Input Voltage (DI) DI -0.3 toVCC+0.3 V Driver Output Voltage (A, B) A, B ±13 V Receiver Input Voltage (A, B) A, B ±13 V Receiver Output Voltage (RO) RO -0.3～VCC+0.3 V SOP8 471 mW Operating Temperature Ranges -40～+85 ℃ Storage Temperature Range -65～+150 ℃ Lead Temperature (soldering, 10s) 300 ℃ Continuous Power Dissipation DC ELECTRICAL CHARACTERISTICS (VCC = +3.3V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 1) PARAMETER CONDITIONS SYMBOL MIN TYP MAX UNITS DRIVER Differential Driver Output VOD1 Figure 1 2.0 V VOD2 Figure 1, R = 27 1.5 V VOD Figure 1, R = 27 VOC Figure 1, R = 27 (No Load) Differential Driver Output Change-in-Magnitude of Differential Output Voltage 0.2 V 3 V (Note 2) Driver Common-Mode Output Voltage http://www.hgsemi.com.cn 2 1 2019 JUN V2.0 HG3485 Change-in-Magnitude of VOC Figure 1, R = 27 Input High Voltage VIH1 DE, DI, RE Input Low Voltage VIL1 DE, DI, RE DI Input Hysteresis VHYS Common-Mode Voltage 0.2 V (Note 2) Input Current (A and B) IIN1 2.0 0.8 IOSD V 100 VIN = 12V DE = GND, VCC = GND or 3.3V VIN = -7V -7V ≦VOUT ≦VCC Driver Short-Circuit Output Current (Note 3) V mV 500 -500 µA -250 0V ≦VOUT ≦12V 0V ≦VOUT≦VCC ±25 -7V ≦VCM ≦12V -200 250 mA -50 mV RECEIVER Receiver Differential Threshold VTH Voltage -110 Receiver Input Hysteresis VTH Receiver Output High Voltage VOH IO = -4mA, VID = -50mV Receiver Output Low Voltage VOL IO = 4mA, VID = -200mV 0.4 V IOZR 0.4V ≦VO≦2.4V ±1 µA RIN -7V≦VCM ≦12V 12 IOSR 0V ≦VRO ≦VCC ±7 Three-State Output Current at Receiver Receiver Input Resistance Receiver Output Short-Circuit Current 30 mV VCC0.4 V kΩ ±95 mA SUPPLY CURRENT Supply Current ICC Supply Current in Shutdown Mode ESD Protection for ISHDN A, B No load, = RE DI= GND or VCC DE = VCC 500 900 µA DE = GND 400 600 µA 0.001 1 µA DE = GND, V R E = VCC Human Body Model ±15 kV SWITCHING CHARACTERISTICS (VCC = +3.3V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) PARAMETER Driver Input to Output SYMBOL t DPLH t DPHL CONDITIONS Figure 3 and 5, RDIFF =54, CL1 = CL2 =100pF MIN TYP MAX 20 40 20 40 UNITS ns Driver Output Skew | tDPLH – tDPHL | t DSKEW Figure 3 and 5, RDIFF =54, CL1 = CL2 =100pF -3 ±10 ns Driver Rise or Fall Time tDR, tDF Figure 3 and 5, RDIFF =54, CL1 = CL2 =100pF 12 25 ns http://www.hgsemi.com.cn 3 2019 JUN V2.0 HG3485 Maximum Data Rate f MAX Driver Enable to Output High t DZH Figure 4and 6, CL =100pF, S2 closed 150 ns Driver Enable to Output Low t DZL Figure 4and 6, CL =100pF, S1 closed 150 ns Driver Disable Time from Low t DLZ Figure 4and 6, CL = 15pF, S1 closed 100 ns Driver Disable Time from High t DHZ Figure 4and 6, CL = 15pF,S2 closed 100 ns Receiver Input to Output t RPLH, t RPHL Figure 9, | VID |≧2.0V rise and fall time of VID≦15ns 50 t RSKD Figure 9, | VID |≧2.0V rise and fall time of VID≦15ns 0 ±10 ns Receiver Enable to Output Low t RZL Figure 2, CL =100pF, S1 closed 20 50 ns Receiver Enable to Output High t RHZ Figure 2, CL =100pF, S2 closed 20 50 ns Receiver Disable Time from Low t RLZ Figure 2, CL =100pF, S1 closed 20 50 ns Receiver Disable Time from High t RHZ Figure 2, CL =100pF, S2 closed 20 50 ns Time to Shutdown t SHDN (Note 4) 200 600 ns | tRPLH – tRPHL| Differential Receiver Skew Driver Enable from Shutdown-to-Output High Driver Enable from Shutdown-to-Output Low Receiver Enable from Shutdown-to-Output Low 50 Mbps ns t DZH(SHDN) Figure 4, CL = 15pF,S2 closed 250 ns t DZL(SHDN) Figure 4, CL = 15pF,S1 closed 250 ns t RZH(SHDN) Figure 2, CL =100pF,S2 closed 3500 ns t RZL(SHDN) Figure 2, CL =100pF,S1 closed 3500 ns Receiver Enable from Shutdown-to-Output High 10 Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referred to device ground unless otherwise noted. Note 2: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes state. Note 3: Maximum current level applies to peak current just prior to fold-back current limiting; minimum current level applies during current limiting. Note 4: The device is put into shutdown by bringing R E high and DE low. If the enable inputs are in this state for less than 50ns, the device is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 600ns, the device is guaranteed to have entered shutdown. http://www.hgsemi.com.cn 4 2019 JUN V2.0 HG3485 Typical Operating Characteristics (VCC = +3.3V, TA = +25°C, unless otherwise noted.) http://www.hgsemi.com.cn 5 2019 JUN V2.0 HG3485 http://www.hgsemi.com.cn 6 2019 JUN V2.0 HG3485 Function Tables TRANSMITTING INPUTS OUTPUTS RE DE DI B A X 1 1 0 1 X 1 0 1 0 0 0 X High-Z High-Z 1 0 X Shutdown RECEIVING INPUTS OUTPUTS RE DE A-B RO 0 X ≧-0.2V 1 0 X ≦-0.2V 0 0 X Open/shorted 1 1 1 X High-Z 1 0 X Shutdown X = Don’t care Shutdown mode, driver and receiver outputs high impedance Test Circuits Figure1. Driver DC Test Load Figure 2. Figure3. Driver Timing Test Load http://www.hgsemi.com.cn Receiver Enable/Disable Timing Test Load Figure 4. 7 Driver Enable/Disable Timing Test Load 2019 JUN V2.0 HG3485 Figure5. Driver Propagation Delays Figure6. Driver Enable and Disable Times Figure7. Receiver Propagation Delays Figure8. Receiver Enable and Disable Times Receiver Propagation Delay Test Circuit Figure10a. Figure9. Figure 10b. Human Body Current Waveform http://www.hgsemi.com.cn Figure 11. 8 Human Body ESD Test Model Driver Output Waveform and FFT Plot 2019 JUN V2.0 HG3485 Detailed Description The HG3485 high - speed transceiver for 50mV minimum noise margin. Unlike previous RS-485 communication contains one driver and threshold complies with the +/-200mV one receiver. These devices feature fail-safe EIA/TIA-485 standard. fail-safe devices, the -50mV to -200mV circuitry, which guarantees a logic-high ESD Protection As with HG3485, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver output and receiver input of the HG3485 has extra protection against static electricity. The ESD-protected pins are tested with reference to the ground pin in a powered-down condition. They are tested to +/- 15kV using the Human Body Model. receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled (see the Fail-Safe section). The HG3485 driver slew rate is not limited, making transmit speeds up to 10Mbps possible.The HG3485 is a half-duplex transceiver. The voltage operates from a single +3.3V supply. Drivers are output short-circuit current limited. Thermal shutdown circuitry ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. protects drivers against excessive power dissipation. When activated, the thermal shutdown circuitry places the driver outputs into a high impedance state. Fail-Safe The HG3485 guarantees a logic-high receiver Human Body Model Figure 10a shows the Human Body Model, and Figure 10b shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5kΩ resistor. output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. This is done by setting the receiver threshold between -50mV and -200mV. If the input voltage of differential receiver (A-B) is greater than or equal to -50mV, RO is logic Machine Model The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. The objective is to emulate the stress caused when I/O pins are contacted by handling equipment during test and assembly. All pins require this protection, high. If A-B is less than or equal to -200mV, RO is logic low. In the case of a terminated bus with all transmitters disabled, the receiver differential input voltage is pulled to 0V by the termination. With the receiver threshold of the HG3485, this results in a logic high with a http://www.hgsemi.com.cn 9 2019 JUN V2.0 HG3485 not just RS-485 inputs and outputs. enter shutdown mode. This guards against inadvertently entering shutdown mode during driver/receiver enabling. Only when the enable inputs are held in this state for 300 ns or more, the device is assured to be in shutdown mode. In this low-power shutdown mode, most internal circuitry is powered down except over temperature protection circuit, and the supply current is typically 40 micron ampere. When either the driver or the receiver is re-enabled, the internal circuitry becomes Applications Information 32 Transceivers on the Bus The standard RS-485 receiver input impedance is 12kΩ (one-unit load), and the standard driver can drive up to 32 unit loads. The HG3485 has a one-unit-load receiver input impedance (12kΩ), allowing up to 256 transceivers to be connected in parallel on one communication line. Any combination of this device and/or other RS-485 transceivers with a total of 32 unit loads or less can be connected to the line. active. If only the driver is re-enabled (DE changed to high) the driver outputs are driven Reduced EMI and Reflections The HG3485, driver slew rate is not limited, High-frequency harmonic components with large amplitudes are evident. transmitting under the same conditions. Figure11 shows driver output waveform and its Fourier analysis of a 20kHz signal transmitted by a HG3485, In general, a transmitter’s rise time relates directly to the length of an unterminated stub, which can be driven with only minor waveform reflections. The following equation expresses this relationship conservatively: Length = tRISE / (10 x 1.5ns/ft) where tRISE is the transmitter’s rise time. For example, the HG3485’s rise time is typically 14ns, which results in excellent waveforms with a stub length up to 1 feet. A system can work well with longer unterminated stubs, even with severe reflections, if the waveform settles out before the UART samples them. according to the DI input after the enable times given by tPZH(SHDN) and tPZL (SHDN) in the driver switching characteristics. If the DI input is open when the driver is enabled, the driver outputs defaults to A high and B low, in accordance with the driver failsafe feature. If only the receiver is re-enabled ( RE changed to low) the receiver output is driven according to the state of the bus inputs (A and B) after the enable time given by tPZH(SHDN) and tPZL(SHDN) in the receiver switching characteristics. If there is no valid state on the bus the receiver responds as described in the failsafe operation section. If both the receiver and driver are re-enabled simultaneously, the receiver output is driven according to the state of the bus inputs (A and B) and the driver output is driven according to the DI input. Note Low-Power Shutdown Mode When both the driver and receiver are disabled (DE low and RE high) the device is in that the state of the active driver affects the inputs to the receiver. Therefore, the receiver outputs are valid as soon as the driver outputs shutdown mode. If the enable inputs are in this state for less than 60 ns, the device does not http://www.hgsemi.com.cn are valid. 10 2019 JUN V2.0 HG3485 110kHz into 120Ω loads. Driver Output Protection Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. The first, a fold back current limit on the output stage, provides immediate protection against short circuits over the whole common-mode voltage range. The second, a thermal shutdown circuit, forces the driver outputs into a high-impedance state if the Figure 12. Line Repeater for HG3485 die temperature becomes excessive. Line Length vs Data Rate The RS-485/RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet, use the repeater application shows in Figure 12. Figure 13 shows the system differential voltage for the parts driving 4000 feet of 26AWG twistedpair wire at Figure 13. HG3485 System Differentia Voltage at 50kHz Driving 4000ft of Cable Applications The HG3485 transceiver is designed for bidirectional data communications on multipoint bus transmission lines. Figures 14 shows typical network applications circuits. To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. The slew-rate-limited HG3485 is more tolerant of imperfect termination. Figure 14. HG3485 Pin Configuration and Typical Half-Duplex Operating C ircuit http://www.hgsemi.com.cn 11 2019 JUN V2.0 HG3485 Package SOP8  

    Dimensions In Millimeters Symbol
Min
Max
Symbol
Min
Max
A 1.225 1.570 D 
  A1   Q  B
   a 
  C    b   C1  
 DIP8
   
 
    
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                   2019 JUN V2.0 HG3485 Important statement: Huaguan Semiconductor Co,Ltd. reserves the right to change the products and services provided without notice. Customers should obtain the latest relevant information before ordering, and verify the timeliness and accuracy of this information. Customers are responsible for complying with safety standards and taking safety measures when using our products for system design and machine manufacturing to avoid potential risks that may result in personal injury or property damage. Our products are not licensed for applications in life support, military, aerospace, etc., so we do not bear the consequences of the application of these products in these fields. Our documentation is only permitted to be copied without any tampering with the content, so we do not accept any responsibility or liability for the altered documents. http://www.hgsemi.com.cn 13 2019 JUN V2.0