UNISONIC TECHNOLOGIES CO., LTD UTRS458 Preliminary CMOS IC FAIL-SAFE, 500KBPS, RS-485 / RS-422 TRANSCEIVERS WITH ±15KV ESD-PROTECTED DESCRIPTION The UTC UTRS458 is a Polarity-Free half-duplex transceiver designed for RS-485 data bus network, which contains one transmitter and one receiver. The UTC UTRS458 features a fail-safe receiver, which guarantees the receiver to output high when the receiver inputs are open, short or idle. The UTC UTRS458 can automatically detect the polarity for A and B pins when pull-high for A and pull-low for B have been designed on the RS485 bus. The detection function is real-time monitored the bus polarity without any data flow on the RS485 bus. The UTC UTRS458 also features a hot-swap glitch free protection circuits which guarantee outputs of both the transmitter and the receiver in a high impedance state during the power up period. So that the large short current from power to ground will be disable by glitch free function, which will save the power and enhance the efficiency of the power up. The UTC UTRS458 is optimized for signal rates up to 500Kbps with differential voltage of 2.3V. The UTC UTRS458 also has the thermal shutdown function when the temperature is over 150°C and the protection of the current limitation in the transmitter to protect the itself from the damage by the system-fault conditions during normal operation. FEATURES * Meet the requirements of the EIA/TIA-485 standards. * 5.0V single power supply. * 1µA low-current shutdown mode. * HBM ±15kV ESD protection. * True fail-safe receiver while maintaining EIA/TIA-485 compatibility. * Hot-swap glitch free protection on control inputs. * Up to 256 transceivers on the bus. * Maximum baud rate up to 500Kbps. * Transmitter short circuit current limit. * Thermal shutdown for overload protection. * Polarity-Free for RS485 bus pins. ORDERING INFORMATION Ordering Number UTRS458G-S08-R www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd Package SOP-8 Packing Tape Reel 1 of 8 QW-R113-016.a UTRS458 Preliminary MARKING PIN CONFIGURATION RO 1 VCC REB 2 7 B DE 3 6 A DI 4 8 CMOS IC 5 GND PIN DESCRIPTION PIN NO. PIN NAME 1 RO 2 REB 3 DE 4 DI 5 6 7 8 GND A B VCC DESCRIPTION Receiver output: When REB is low and if (A-B) ≥ -50mV, RO is high; if (A-B) ≤ -250mV, RO is low. Receiver output enable: REB is low to enable the Receiver; REB is high to disable the Receiver. Transmitter output enable: DE is high to enable the transmitter; DE is low to disable the transmitter. Transmitter input: When DE is high, a low on DI forces An output low and B output high. Similarly, a high on DI forces An output high and B output low. Ground pin. Must be connected to 0V. Non-inverting receiver input and non-inverting transmitter output Inverting receiver input and inverting transmitter output Power supply Input 5.0V. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 8 QW-R113-016.a UTRS458 CMOS IC BLOCK DIAGRAM RO 1 RX Polarity Detection Circuit Preliminary REB 2 DE 3 DI 4 TX UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 VCC 7 B 6 A 5 GND 3 of 8 QW-R113-016.a UTRS458 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Power Supply VCC VCC -0.3~8.0 V Control Input Voltage REB, DE -0.3~ (VCC+0.3) V Receiver Input Voltage A, B ±13 V Receiver Output Voltage RO -0.3~ (VCC+0.3) V Transmitter Output Voltage A, B ±13 V Transmitter Input DI -0.3~ (VCC+0.3) V Operating Temperature TOP -40~+85 °C Storage Temperature TSTG -65~+150 °C Note: Absolute maximum ratings are only stress ratings and it is not implied for functional device operation. Absolute maximum ratings are the values beyond which the device will be damaged permanently. DC ELECTRICAL CHARACTERISTICS (VCC=5.0V ±5% with TA=TMIN to TMAX, unless otherwise noted. Typical values are at VCC=5.0V and TA=25°C) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX TRANSMITTER Differential Transmitter Output VOD1 No Load 5.0 Differential Transmitter Output VOD2 Fig.1, RL=27Ω 1.5 Change in Magnitude of ∆VOD Fig.1, RL=27Ω 0.2 Differential Output Voltage Transmitter Common- Mode VOC Fig.1, RL=27Ω 3.0 Output Voltage Change in Magnitude of ∆VOC Fig.1, RL=27Ω 0.2 Common- Mode Voltage Input High Voltage VIH DE, DI, REB 2.0 Input Low Voltage VIL DE, DI, REB 0.8 Input Current IIN1 DI ±1 Input Current IIN2 DE, REB ±50 DI Input Hysteresis VHYS 100 DE=GND, VIN=12V 125 Input Current (A and B) IIN3 VCC=GND or 5.25V -75 VIN=-7V Transmitter Short-Circuit -7V≤VOUT≤VCC -250 IOS Output Current 0V≤VOUT≤12V 250 RECEIVER Receiver Differential Threshold VTH -7V≤VCM≤+12V -280 -125 -50 Voltage Receiver Input Hysteresis ∆VTH 25 Receiver Output High Voltage VOH IO=-4mA, VID=-50mV VCC-1.5 Receiver Output Low Voltage VOL IO=4mA, VID=-200mV 0.5 Three- State Output Current at IOZR 0.4V≤VCM≤2.4V ±1 Receiver Receiver Input Resistance RIN -7V≤VCM≤+12V 96 Receiver Output Short-Circuit IOSR Fig.6, 0V≤VRO≤VCC ±7 ±95 Current SUPPLY CURRENT No Load, DE=VCC 420 600 Supply Current ICC REB=GND, DE=GND 320 500 DI=VCC or GND. Supply Current in Shutdown ISHDN REB=VCC, DE=GND 1.0 10 Mode UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw UNIT V V V V V V V µA µA mV µA µA mA mA mV mV V V µA kΩ mΑ µA µA µA 4 of 8 QW-R113-016.a UTRS458 Preliminary CMOS IC SWITCHING CHARACTERISTICS (VCC=5.0V ±5% with TA=TMIN to TMAX, unless otherwise noted. Typical values are at VCC=5.0V and TA=25°C) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX Transmitter Input to Output tDPLH, tDPHL Fig.2 and 7, RDIFF=54Ω, CL1=CL2= 100pF 50 720 900 Transmitter Output Skew tDSKEW Fig.2 and 7, RDIFF=54Ω, CL1=CL2= 100pF 3 ±100 | tDPLH - tDPHL | Transmitter Rise or Fall Time tDF, tDR Fig.2 and 7, RDIFF=54Ω, CL1=CL2= 100pF 530 750 Maximum Data Rate fMAX 500 Transmitter Enable to Output tDZL Fig.4 and 8, CDL=100pF, S1 Closed 2500 Low Transmitter Enable to Output tDZH Fig.4 and 8, CDL=100pF, S2 Closed 2500 High Transmitter Disable Time tDLZ Fig.4 and 8, CDL=15pF, S1 Closed 300 from Low Transmitter Disable Time tDHZ Fig.4 and 8, CDL=15pF, S2 Closed 500 from High Fig.5 and 9 , |VID|≥2.0V; Rise and Fall Time 1500 Receiver Input to Output tRPLH, tRPHL of VID≤15ns Fig.5 and 9 , |VID|≥2.0V; Rise and Fall Time | tRPLH – tRPHL | Different tRSKD 500 Receiver Skew of VID≤15ns Receiver Enable to Output tRZL Fig.3 and 10, CRL=100pF, S1 Closed 50 Low Receiver Enable to Output tRZH Fig.3 and 10, CRL=100pF, S2 Closed 50 High Receiver Disable Time from tRLZ Fig.3 and 10, CRL=100pF, S1 Closed 50 Low Receiver Disable Time from tRHZ Fig.3 and 10, CRL=100pF, S2 Closed 50 High Time to Shutdown tSHDN 200 Transmitter Enable from tDZL(SHDN) Fig.4 and 8, CDL=15pF, S1 Closed 3000 Shutdown to Output Low Transmitter Enable from tDZH(SHDN) Fig.4 and 8, CDL=15pF, S2 Closed 3000 Shutdown to Output High Receiver Enable from tRZL(SHDN) Fig.3 and 10, CRL=100pF, S1 Closed 200 Shutdown to Output Low Receiver Enable from tRZH(SHDN) Fig.3 and 10, CRL=100pF, S2 Closed 200 Shutdown to Output High UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw UNIT ns ns ns Kbps ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5 of 8 QW-R113-016.a UTRS458 Preliminary CMOS IC FUNCTION TABLE TRANSMITTING REB X X 0 1 INPUTS DE 1 1 0 0 OUTPUTS DI 0 1 X X A 0 1 High-Z B 1 0 High-Z Shutdown RECEIVING INPUTS DE X X X 1 0 REB A-B 0 ≥-0.05V 0 ≤-0.2V 0 Open/Shorted 1 X 1 X = Don’t care Shutdown mode, transmitter and receiver outputs high impedance UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw OUTPUT RO 1 0 1 High-Z Shutdown 6 of 8 QW-R113-016.a UTRS458 Preliminary CMOS IC TEST CIRCUIT A 1K B Rx VCC VCC DE S1 S1 CRL 1K CDL VDC Tx 500 A REB S2 S2 Fig. 3 Receiver Enable/Disable Timing Test Circuit UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw B Fig. 4 Transmitter Enable/Disable Timing Test Circuit 7 of 8 QW-R113-016.a UTRS458 Preliminary CMOS IC TEST CIRCUIT (Cont.) VOH RO 1.5V 1.5V REB 3V 0V Output VOL 1.5V 1.5V tRZL tRLZ VCC RO tRPHL tRPLH A Input B -1V Fig. 9 Receiver Propagation Delays RO VOL VOH 0 1.5V Output Normally Low VOL+0.5V Output Normally High 1.5V tRZH VOH-0.5V tRHZ Fig. 10 Receiver Enable and Disable Times UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 8 QW-R113-016.a