AZRS3072

AZRS3072 ESD-Protected, Slew-Rate-Limited, True Fail-Safe 3.3V RS485 Transceiver IC Features The AZRS3072 features a fail-safe receiver,  Meet the Requirements of the EIA/TIA-485 which guarantees the output of the receiver to be Standards with 3.3V Power Supply and logic high when the differential inputs of the Integrated Transient Voltage Suppressor receiver are open, short or idle conditions. (TVS) The AZRS3072 has a slew-rate-limited transmitter to minimize EMI and reflection  TVS Protection for Bus Terminals : caused by improperly cable terminated. ±15 kV IEC 61000-4-2, Contact Discharge The AZRS3072 features a hot-swap glitch-free ±18 kV IEC 61000-4-2, Air-Gap Discharge which guarantees outputs of the transmitter and ±15 kV EIA/JEDEC Human Body Model the receiver in a high impedance state and even  HBM ±8kV ESD Protection for all pins no short current event during the power up period.  MM ±800V ESD Protection for all pins The AZRS3072 has the thermal shutdown and  Latchup immunity up to ±400mA for all pins. the current limited function in the transmitter to  High CDM protection up to ±1kV for all pins.. protect the device from damage by system fault  Enhanced Slew-Rate Limiting Facilitates condition during normal operating condition. The Error-Free Data Transmission AZRS3072 is designed 1/8 unit load with  True Fail-Safe Receiver While Maintaining minimum 96kohm of input impedance, which can EIA/TIA-485 Compatibility connect 256 devices on a bus at least. The  Hot-Swap Glitch free Protection on Control AZRS3072 is also a high reliable device with built-in system level ESD protected devices Inputs  Up to 256 Transceivers on the Bus against high-energy noise transients without requiring any external components. Applications  Telecommunications Equipment  Security System RO RX 1  Industrial Control  Building Automation Networks REB 2 Description DE The AZRS3072 is a ±15kV IEC 61000-4-2 HBM 8kV IEC61000 Contact 15kV HBM 8kV IEC61000 Contact 15kV 3 contact discharge protected half-duplex RS485 8 VCC 7 B 6 A 5 GND HBM 8kV HBM 8kV TX transceiver IC, which contains one transmitter DI 4 HBM 8kV and one receiver inside. This device is fully compliant with the EIA/TIA-485 standard with Functional Block of AZRS3072 3.3V power supply. Part Number Duplex Tx/Rx Supply Data Rate (V) (Kbps) AZRS3072 Half 1/1 3.3 250 Revision 2016/05/06 © 2016 Amazing Micro. Slew- Rate Fail- Safe HBM/MM IEC 61000-4-2 (V) Contact (V) Type Yes Yes 8K/800 ± 15k SOP8 1 Package www.amazingIC.com AZRS3072 ESD-Protected, Slew-Rate-Limited, True Fail-Safe 3.3V RS485 Transceiver IC ABSOLUTE MAXIMUM RATINGS PARAMETER PARAMETER RATING UNITS Vcc -0.3 to 7.0 V REB, DE -0.3 to (Vcc+ 0.3) V Receiver Input Voltage A, B 13 V Receiver Output Voltage RO -0.3 to (Vcc+ 0.3) V Transmitter Output Voltage A, B 13 V Transmitter Input DI -0.3 to (Vcc+ 0.3) V Operating Temperature TOP -40 to +85 o -65 to +150 o Power Supply Vcc Control Input Voltage Storage Temperature TSTO C C DC ELECTRICAL CHARACTERISTICS o (Vcc=3.3V±5% with TAMB= TMIN to TMAX, unless otherwise noted. Typical values are at Vcc=3.3V and TAMB= 25 C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Vcc V Transmitter Differential Transmitter Output VOD1 No load Differential Transmitter Output VOD2 Fig.1, RL= 27  Change in Magnitude of  VOD Fig.1, RL= 27  0.2 V VOC Fig.1, RL= 27  3 V  VOC Fig.1, RL= 27  0.2 V Input High Voltage VIH DE, DI, REB Input Low Voltage VIL DE, DI, REB 0.8 V Input Current IIN1 DE, DI, REB ±2 μA Input Current for A and B IIN2 Differential Output Voltage Transmitter Common- Mode Output Voltage Change in Magnitude of Common- Mode Voltage Transmitter Short-Circuit Output Current IOSD Revision 2016/05/06 © 2016 Amazing Micro. 1.5 2.0 DE=0, Vcc=0V VIN=12V or 3.6V VIN=-7V -7V  VOUT  12V 2 V V 125 -100 -250 250 μA mA www.amazingIC.com AZRS3072 ESD-Protected, Slew-Rate-Limited, True Fail-Safe 3.3V RS485 Transceiver IC PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS -50 mV RECEIVER Receiver Differential Threshold Voltage VTH -200 Receiver Output High Voltage VOH Io= -1mA, VID= 200mV Receiver Output Low Voltage VOL Io= 1mA, VID= -200mV IOZR 0 RIN -7V IOSR Fig. 6, 0V Three- State Output Current at Receiver Receiver Input Resistance Receiver Output Short-Circuit Current Vcc-0.6 V  VO  Vcc  VCM  +12V 0.4 V 1 μA 96 k  VRO  Vcc 80 mA SUPPLY CURRENT Supply Current Supply Current in Shutdown Mode Icc ISHDN No load, REB= 0, DE= Vcc 400 900 μA No load, REB= Vcc, DE= Vcc 400 900 μA No load, REB= 0, DE= 0 300 600 μA 1 10 μA REB= Vcc, DE= 0 ESD PROTECTION ESD Protection for A and B Human Body Model (HBM) 15 kV IEC 61000-4-2 Contact 15 kV IEC 61000-4-2 Air 18 kV SWITCHING CHARACTERISTICS (Vcc=3.3V 5% with TAMB= TMIN to TMAX, unless otherwise noted. Typical values are at Vcc=3.3V and TAMB= 25 C.) o PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 1600 ns 200 ns 1800 ns 250 kbps Transmitter Transmitter Propagation Delay Transmitter Output Skew tDPLH tDPHL tDPLH, tDPHL tDSKEW Transmitter Rise or Fall Time tDF, tDR Data Rate fData Revision 2016/05/06 © 2016 Amazing Micro. Fig.2, Fig.7, RDIFF=54, CL1=CL2= 100pF 300 Fig.2, Fig.7, RDIFF=54, CL1=CL2= 100pF Fig.2, Fig.7, RDIFF=54, CL1=CL2= 100pF 3 350 www.amazingIC.com AZRS3072 ESD-Protected, Slew-Rate-Limited, True Fail-Safe 3.3V RS485 Transceiver IC Transmitter Enable to Output Low Transmitter Enable to Output High Transmitter Disable Time from Low Transmitter Disable Time from High Transmitter Enable from Shutdown to Output Low Transmitter Enable from Shutdown to Output High Time to shutdown tDZL tDZH tDLZ tDHZ tDZL(SHDN) tDZH(SHDN) Fig.4, Fig.8, CDL= 50pF, S1 closed Fig.4, Fig.8, CDL= 50pF, S2 closed Fig.4, Fig.8, CDL= 50pF, S1 closed Fig.4, Fig.8, CDL= 50pF, S2 closed Fig.4, Fig.8, CDL= 50pF, S1 closed Fig.4, Fig.8, CDL= 50pF, S2 closed tSHDN 50 200 2500 ns 2500 ns 200 ns 200 ns 5500 ns 5500 ns 600 ns 200 ns 30 ns 250 kbps 100 ns 100 ns 100 ns 100 ns 4000 ns 4000 ns 600 ns Receiver  2.0V; rise and fall time of VID  Fig.5, Fig.9, V ID Receiver Input to Output tRPLH, tRPHL 15ns tRPLH tRPHLDifferent Receiver Skew Data Rate Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable Time from Low Receiver Disable Time from High Receiver Enable from Shutdown to Output Low Receiver Enable from Shutdown to Output High Time to shutdown tRSKD  2.0V; rise and fall time of VID  Fig.5, Fig.9, V ID fData tRZL tRZH tRLZ tRHZ tRZL(SHDN) tRZH(SHDN) Fig.3, Fig.10, CRL= 15pF, S1 closed Fig.3, Fig.10, CRL= 15pF, S2 closed Fig.3, Fig.10, CRL= 15pF, S1 closed Fig.3, Fig.10, CRL= 15pF, S2 closed Fig.3, Fig.10, CRL= 15pF, S1 closed Fig.3, Fig.10, CRL= 15pF, S2 closed tSHDN Revision 2016/05/06 © 2016 Amazing Micro. 50 4 200 www.amazingIC.com AZRS3072 ESD-Protected, Slew-Rate-Limited, True Fail-Safe 3.3V RS485 Transceiver IC PIN FUNCTION DESCRIPTION Pin Number Mnemonic 1 RO Function Receiver Output: When REB is low and if (A - B) ≥ -50mV, RO is high; if (A - B) ≤ -200mV, RO is low. 2 REB Receiver Output Enable: REB is low to enable the Receiver; REB is high to disable the Receiver. 3 DE Transmitter Output Enable: DE is high to enable the transmitter; DE is low to disable the transceiver. 4 DI Transmitter Input: When DE is high, a low on DI forces A output low and B output high. Similarly, a high on DI forces A output high and B output low. 5 GND 6 A Ground. Non-inverting Receiver Input and Non-inverting Transmitter Output. 7 B Inverting Receiver Input and Inverting Transmitter Output. 8 VCC Power Supply Input 3.3V. FUNCTION TABLE TRANSMITTING REB INPUTS DE DI A OUTPUTS B X X 0 1 1 1 0 0 0 1 X X 0 1 High- Z 1 0 High- Z Shutdown X= Don’t care HIGH- Z= High impedance RECEIVING REB INPUTS DE 0 0 0 1 1 X X X 1 0 A–B  0.05 V  0.2 V Open/Shorted X X OUTPUTS RO 1 0 1 High- Z Shutdown X= Don’t care HIGH- Z= High impedance Revision 2016/05/06 © 2016 Amazing Micro. 5 www.amazingIC.com AZRS3072 ESD-Protected, Slew-Rate-Limited, True Fail-Safe 3.3V RS485 Transceiver IC Detail Description The AZRS3072 is a half-duplex RS-485 transceiver IC with IEC61000-4-2 contact ±15kV (REB=HIGH), the output of the receiver keeps in high impedance state no matter what receiver input. ESD protection for bus pins (A and B), which contains one transmitter and one receiver inside with 3.3V power supply. This device is fully compliant with the EIA/TIA-485 standard. The AZRS3072 features the hot-swap glitch free design which guarantees the outputs of the transceiver in a high impedance state during the power-up period until the supply voltage has stabilized. The AZRS3072 with whole chip ESD protected design for all of the I/O pins has robust ESD protection up to both HBM ±8kV and MM ±800V. True Fail-Safe In traditional design, the fail-safe function is implemented by resistors on the PCB. One resistor is terminated pin A to VCC; the other is terminated pin B to GND to keep RO at high state when bus is idle, which is only the open fail-safe. The AZRS3072 guarantees a receiver output high when the receiver inputs are short, open or idle, that is true fail-safe. The threshold voltage of receiver input is between -50mV and -200mV. If the differential input voltage (A - B) of receiver is greater than or equal to -50mV, receiver output (RO) is logic-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’s differential input voltage (A - B) is 0V, so the RO is logic-high at that time. Moreover, the latchup immunity of the AZRS3072 is up to ±400mA for all of the pins. For IC self discharge issue, the CDM protection level of the AZRS3072 is up to ±1kV. Transmitter The design of the transmitter is a non-inverted translator that converts the single-ended TTL 1/8 Unit Load input signal to differential EIA/TIA-485 signal The RS-485 standard defines both receiver inputs impedance are 12kΩ (1 unit load) and the maximum 32-unit loads on the bus. The AZRS3072 transceiver has a 96kΩ input impedance (1/8 unit load) of the receiver, allowing up to 256 or fewer devices to be connected in parallel on the RS485 bus. level. The transmitter of the AZRS3072 has a slew-rate-limited driver to minimize EMI and reflection caused by improperly cable terminated. When the transmitter is active (DE= HIGH), the single-end TTL input signals of transmitter will be transported to differential output RS485 signals of the transmitter. Under the disable state (DE= Transmitter Output Protection LOW), the outputs of transmitter keep at high The AZRS3072 has the current limitation function and the thermal shutdown protection in the transmitter. Firstly, the function of current limitation provides immediate protection against short circuits over the whole common-mode voltage range (-7V to +12V). Secondly, the function of thermal shutdown protection forces the transmitter outputs into a high impedance state if the die temperature becomes excessive. impedance state. The differential output voltage (VA-VB) of the AZRS3072 is at least 1.5V with 54 ohm load under T= 25oC. Receiver The receiver of the AZRS3072 converts the differential EIA/TIA-485 signals to single-end output TTL signal when receiver is in active state (REB=LOW) When the receiver is disable Revision 2016/05/06 © 2016 Amazing Micro. 6 www.amazingIC.com AZRS3072 ESD-Protected, Slew-Rate-Limited, True Fail-Safe 3.3V RS485 Transceiver IC RL A Tx Tx VOD B Fig.1 Transmitter DC test circuit 1K VCC DE VCC S1 S1 CRL CL1 Fig.2 Transmitter timing test circuit A Rx RDIFF B VOC RL B CL1 A CDL 1K Tx VDC 500 A S2 REB B S2 Fig.3 Receiver enable/disable timing test load Fig.4 Transmitter enable/disable timing test load IOSR A A RO Rx VID Rx VID B B + Power Source REB 3V Fig.6 Receiver output short circuit 1.5V 3V 1.5V DE 0V 1.5V tDZL 0.5Vo Vo 1.5V 0V tDPHL tDPLH B 2.3V VOL VOD = VA - VB 90% Fig.7 Transmitter Propagation Delays VOH RO tDZH tDF tDR tDHZ Fig.8 Transmitter Enable and Disable Times 3V 1.5V 1.5V 1.5V REB Output 1.5V VOH - 0.5V 2.3V 0 10% VOL + 0.5V Output Normally Low Output Normally High A,B VOH 90% 10% tDLZ A,B 0.5Vo A VOD - REB = Low Fig.5 Receiver timing test circuit DI VRO 0V VOL tRZL tRLZ Vcc tRPHL tRPLH RO 1.5V VOL A +1V Output Normally Low VOL + 0.5V Output Normally High Input RO B -1V VOH 1.5V 0 tRZH VOH - 0.5V tRHZ Fig.9 Receiver Propagation Delays Fig.10 Receiver Enable and Disable Times Revision 2016/05/06 © 2016 Amazing Micro. 7 www.amazingIC.com AZRS3072 ESD-Protected, Slew-Rate-Limited, True Fail-Safe 3.3V RS485 Transceiver IC Mechanical Details SOP-8 PACKAGE DIAGRAMS TOP VIEW PACKAGE DIMENSIONS Symbol Inches min max min max A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.004 0.010 A2 1.35 1.55 0.053 0.061 b 0.33 0.51 0.013 0.020 C 0.17 0.26 0.007 0.010 D 4.70 5.10 0.185 0.201 E 3.70 4.10 0.146 0.161 E1 5.80 6.20 0.228 0.244 e L Θ SIDE VIEW Millimeters 1.27 BSC 0.05BSC 0.40 1.27 0.016 0.050 0 8 0 8 MARKING CODE RS3072 WWXXG END VIEW RS3072 = Device Code WW = Date Code XX = Control Code G = Green Part Indication Part Number Marking Code AZRS3072 RS3072 WWXXG Revision 2016/05/06 © 2016 Amazing Micro. 8 www.amazingIC.com AZRS3072 ESD-Protected, Slew-Rate-Limited, True Fail-Safe 3.3V RS485 Transceiver IC Ordering Information PN# Material Type Reel size MOQ/interal box MOQ/carton AZRS3072.RDG Green T/R 13 inch 1 reel=2,500/box 5 box=12,500/carton Revision History Revision Revision 2015/07/07 Revision 2015/07/29 Revision 2016/05/06 Modification Description Formal Release. Delete L1 and Add Θ parameters in Package Dimensions Table Modified the indication of Marking code. Revision 2016/05/06 © 2016 Amazing Micro. 9 www.amazingIC.com