A3085 AITSEMI | Alldatasheet

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AiT Semiconductor Inc. www.ait-ic.com A3085 RS-485 TRANSCEIVERS FAIL-SAFE, HIGH-SPEED SLEW-RATE-LIMITED REV1.0 - MAY 2020 RELEASED - - 1 - DESCRIPTION FEATURES The A3085 is a 5V, high-speed transceivers for RS485 communication contain on e driver and one receiver. The A3085 feature fail-safe circuitry, which guarantees a logic -high receiver output when the receiver input are open or shorted. This means that the receiver output will be a logi c high if all transmitters on a te rminated bus are disabled (high impedance). The A 3085 feature re duced slew -rate drivers that minimized EMI and reduce reflectio ns caused by improperly terminated cables. The A3085 offer hig her driver output slew-rate limits, allowing transmit speeds up to 500kbps. The A 3085 have a 1/8 -unit-load receiver input impedance that allows up to 256 transceivers on the bus. The A3085 is intended for half-duplex communications. The A3085 is available in SOP8 package ⚫ +5V Operation ⚫ Fail-Safe Circuit ⚫ Maximum Data Rate:500kbps ⚫ Allow Up to 256 Transceivers on the Bus ⚫ I/O Pins ESD Protection: ±18kV IEC 61000-4-2 ,Contact Discharge ⚫ Available in SOP8 package APPLICATION ⚫ Smart Meter ⚫ DVR ⚫ Transceivers for EMI-Sensitive Applications ⚫ Industrial-Control Local Area Networks ⚫ RS-485 Communications Level Translators ORDERING INFORMATION TYPICAL APPLICATION Package Type Part Number SOP8 SPQ: 2,500pcs/Reel M8 A3085M8R A3085M8VR Note V: Halogen free Package R: Tape & Reel AiT provides all RoHS products Typical Half-Duplex RS-485 Network

AiT Semiconductor Inc. www.ait-ic.com A3085 RS-485 TRANSCEIVERS FAIL-SAFE, HIGH-SPEED SLEW-RATE-LIMITED REV1.0 - MAY 2020 RELEASED - - 2 - PIN DESCRIPTION Top View Pin # Symbol Functions 1 RO Receiver Output. 2 /RE Receiver Output Enable. /RE is low to enable the Receiver; /RE is high to disable the Receiver. 3 DE Driver Output Enable. DE is high to enable the Driver; DE is low to disable the Driver.

4 DI Driver Input

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 Power Supply. FUNCTION TABLE Transmitting Inputs Outputs /RE DE DI A B X 1 1 1 0 X 1 0 0 1 0 0 X High-Z High-Z 1 0 X Shutdown (High-Z) Receiving Inputs Outputs /RE DE A-B RO

0 X >-50mV 1

0 X <-200mV 0

0 X Open/Shorted 1

（High-Z）

AiT Semiconductor Inc. www.ait-ic.com A3085 RS-485 TRANSCEIVERS FAIL-SAFE, HIGH-SPEED SLEW-RATE-LIMITED REV1.0 - MAY 2020 RELEASED - - 3 - ABSOLUTE MAXIMUM RATINGS VCC, Power Supply +7V /RE, DE, Control Input Voltage -0.3V～VCC+0.3V DI, Transmitter Input Voltage -0.3V～VCC+0.3V A, B, Transmitter Output Voltage -8V～+13V A, B, Receiver Input Voltage -8V～+13V RO, Receiver Output Voltage -0.3V～VCC+0.3V Operating Temperature -40℃～+85℃ Storage Temperature -65℃～+150℃ Operating Junction Temperature 125℃ Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

AiT Semiconductor Inc. www.ait-ic.com A3085 RS-485 TRANSCEIVERS FAIL-SAFE, HIGH-SPEED SLEW-RATE-LIMITED REV1.0 - MAY 2020 RELEASED - - 4 - DC ELECTRICAL CHARACTERISTICS VCC=+5V±5℅, TA=-40℃～+85℃, Typical Values @ VCC=+5V, TA＝25℃NOTE1 Parameter Symbol Conditions Min. Typ. Max. Unit Power Supply VCC 4.5 - 5.5 V Driver Differential Driver Output (no load) VOD1 Figure 1 - - 5 V Differential Driver Output VOD2 Figure 1, R=27Ω 1.5 - - V Change in Magnitude of Differential Output VoltageNOTE2 ΔVOD Figure 1, R=27Ω - - 0.2 V Driver Common-mode Output Voltage VOC Figure 1, R=27Ω 1.0 - 3.0 V Change in Magnitude of Common-Mode VoltageNOTE2 ΔVOC Figure 1, R=27Ω - - 0.2 V Input High Voltage VIH DE, DI, /RE 2.0 - - V Input Low Voltage VIL DE, DI, /RE - - 0.8 V DI Input Hysteresis VHYS - 100 - mV Input Current(A and B) IIN4 DE=GND, VCC= GND or 5.25V VIN=12V - - 125 μA VIN=-7V -75- - - Driver Short-Circuit Output Current IOSD A Pin Short to B Pin -100 - 100 mA Receiver Receiver Differential Threshold Voltage VTH -7V≤VCM≤12V -200 -125 -50 mV Receiver Input Hysteresis ΔVTH - 40 - mV Receiver Output High Voltage VOH IO=-8mA, VID=-50mV 4.0 - - V Receiver Output Low Voltage VOL IO=8mA, VID=-200mV - - 0.4 V Three-State Output Current at Receiver IOZR - - ±1 μA Receiver Input Resistance RIN -7V≤VCM≤12V 96 - - kΩ Receiver Output Short-Circuit Current IOSR 0V≤VRO≤VCC ±7 - ±95 mA Supply Current Supply Current ICC No load, /RE= DI=GND or VCC DE=VCC - 150 600 μA DE=GND - 185 600 μA Supply Current in Shutdown Mode ISHDN DE=GND, /RE=VCC, DI=VCC or GND - - 10 μA NOTE1: 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. NOTE2: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes state.

AiT Semiconductor Inc. www.ait-ic.com A3085 RS-485 TRANSCEIVERS FAIL-SAFE, HIGH-SPEED SLEW-RATE-LIMITED REV1.0 - MAY 2020 RELEASED - - 5 - SWITCHING CHARACTERISTICS VCC=+5V±5℅, TA=-40℃～+85℃, Typical values @ VCC=+5V, TA＝25℃ Parameter Symbol Conditions Min. Typ. Max. Unit Driver Input to Output tDPLH Figure 3 and 5, RDIFF=54Ω CL1=CL2=100pF - 450 800 ns tDPHL - 450 800 Driver Output Skew |TDPLH – TDPHL| tDSKEW Figure 3 and 5, RDIFF=54Ω CL1=CL2=100pF - - 100 ns Driver Rise or Fall Time tDR, tDF Figure 3 and 5, RDIFF=54Ω CL1=CL2=100pF - 150 500 ns Maximum Data Rate FMAX 500 - - kbps Driver Enable to Output High tDZH Figure 4 and 6, CL=100pF S2 Closed - - 200 ns Driver Enable to Output Low tDZL Figure 4 and 6, CL=100pF S1 Closed - - 200 ns Driver Disable Time from Low tDLZ Figure 4 and 6, CL=15pF S1 Closed - - 300 ns Driver Disable Time from High tDHZ Figure 4 and 6, CL=15pF S2 Closed - - 300 ns Receiver Input to Output tRPLH tRPHL Figure 7 and 9, |VID| ≥ 2.0V; rise and fall time of VID≦15ns - 450 800 ns |TRPLH – TRPHL| Differential Receiver Skew tRSKD Figure 7 and 9, |VID| ≥ 2.0V; rise and fall time of VID≦15ns - 30 - ns Receiver Enable to Output Low tRZL Figure 2 and 8, CRL=15pF S1 Closed - 20 50 ns Receiver Enable to Output High tRZH Figure 2 and 8, CRL=15pF S2 Closed - 20 50 ns Receiver Disable Time from Low tRLZ Figure 2 and 8, CRL=15pF S1 Closed - 80 150 ns Receiver Disable Time from High tRHZ Figure 2 and 8, CRL=15pF S2 Closed - 80 150 ns Time to Shutdown tSHDN - 50 300 ns Driver Enable from Shutdown to Output High tDZH(SHDN) Figure 4 and6, CL=100pF S2 Closed - - 200 ns Driver Enable from Shutdown to Output Low tDZL(SHDN) Figure 4 and 6, CL=100pF S1 Closed - - 200 ns Receiver Enable from Shutdown to Output High tRZH(SHDN) Figure 2 and 8, CRL=15pF S2 Closed - - 300 ns Receiver Enable from Shutdown to Output Low tRZL(SHDN) Figure 2 and 8, CRL=15pF S1 Closed - - 300 ns

AiT Semiconductor Inc. www.ait-ic.com A3085 RS-485 TRANSCEIVERS FAIL-SAFE, HIGH-SPEED SLEW-RATE-LIMITED REV1.0 - MAY 2020 RELEASED - - 8 -

PACKAGE INFORMATION

Dimension in SOP8 (Unit: mm) Symbol Min Max A - 1.77 A1 0.08 0.28 A2 1.20 1.60 A3 0.55 0.75 b 0.39 0.48 b1 0.38 0.44 c 0.20 0.26 c1 0.19 0.21 D 4.70 5.10 E 5.80 6.20 E1 3.70 4.10 e 1.27 BSC h 0.25 0.50 L 0.50 0.80 L1 1.05 REF θ 0° 8°

AiT Semiconductor Inc. www.ait-ic.com A3085 RS-485 TRANSCEIVERS FAIL-SAFE, HIGH-SPEED SLEW-RATE-LIMITED REV1.0 - MAY 2020 RELEASED - - 9 - IMPORTANT NOTICE AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to discontinue any integrated circuit product or service with out notice, and advises its customers t o obtain the latest version of relevant information to v erify, before placing orders, that the information being relied on is current. AiT Semiconductor Inc. 's integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life support applications, devices or system s or other critical applications. Use of AiT products in such applications is understood to be fully at the risk of the customer. As used herein may involve potential risks of de ath, personal injury, or servere property, or environmental damage. In order t o minimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards. AiT Semiconductor Inc . assum es to no liability to customer product design or application support. AiT warrants the performance of its products of the specifications applicable at the time of sale.