3V to 5.5V-Powered, ±15kV ESD-Protected, Slew-Rate-Limited, True RS-485 Transceivers UM3483E/UM3486E SOP8/DIP8. Features

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1 3V to 5.5V-Powered, ±15kV ES-Protected, Slew-Rate-Limited, True RS-485 Transceivers UM3483E/UM3486E SOP8/IP8 General escription The UM3483E, UM3486E are 3V to 5.5V-powered, ±15kV ES-protected, slew-rate-limited differential transceivers which provide full RS485 compatibility. Each part contains one driver and one receiver, which is designed for data transmission with extended common mode range (-7V to 12V). The UM3483E features slew-rate-limited driver which minimizes EMI and reduces reflections resulted from improperly terminated cables. The UM3483E allows up to 5kbps error-free data transmission, while the partially slew-rate-limited UM3486E transmits at data rates up to 2.5Mbps. The UM3483E, UM3486E also feature enhanced electrostatic discharge (ES) protection. All of the transmitter outputs and receiver inputs are protected to ±15kV using IEC Air-Gap ischarge, ±15kV using the Human Body Model and ±8kV using IEC Contact ischarge. rivers are short-circuit current limited. When the driver outputs are placed into a high-impedance state by thermal shutdown circuitry, drivers are protected against excessive power dissipation. And the fail-safe feature of the receiver input guarantees a logic-high output if both inputs are open, shorted or idle. Both parts have power up/down mode, the glitch-free driver outputs permit live insertion or removal of the transceiver into/from the data bus. The CMOS design offers significant power savings without sacrificing ruggedness against overload or ES damage. The typical quiescent current is only 3μA during operation and 1μA in shutdown mode. The UM3483E, UM3486E are intended for half-duplex communication and are available in SOP8 and IP8 packages. Applications Telecommunications Low-Power RS-485 Transceivers Integrated Services igital Networks Industrial-Control Local Area Networks Transceivers for EMI-Sensitive Applications Packet Switching Level Translators Features ES Protection for RS-485 I/O Pins ±15kV Human Body Model ±15kV IEC61-4-2, Air-Gap ischarge ±8kV IEC61-4-2, Contact ischarge 3V to 5.5V Supply Voltage Range Enhanced Slew-Rate Limiting Facilitates Error-Free ata Transmission 1μA Low-Current Shutdown Mode -7V to +12V Common-Mode Input Voltage Range Allows up to 256 Transceivers on the Bus Thermal Shutdown Current-Limiting for river Overload Protection Rev.3 ec.214 1/18

2 Ordering Information Part Number Operating Temperature Mark Code Package Type UM3483EESA -4 C to +85 C UM3483EESA SOP8 UM3483EEPA -4 C to +85 C UM3483EEPA IP8 UM3486EESA -4 C to +85 C UM3486EESA SOP8 UM3486EEPA -4 C to +85 C UM3486EEPA IP8 Selection Guide Part Number Guaranteed ate Rate (Mbps) Low-Power Shutdown Slew-Rate Limited river/ Receiver Enable Shutdown Current (μa) Transceivers On Bus ±15kV ES Protection UM3483E.5 Yes Yes Yes Yes UM3486E 2.5 Yes Yes Yes Yes Pin Configurations Top View RO RE V CC B UM3483 EESA YYWW UM3486 EESA YYWW E 3 6 A I 4 5 GN YY: Year Code WW: Week Code UM3483EESA SOP8 YY: Year Code WW: Week Code UM3486EESA SOP8 RO RE V CC B UM3483 EEPA XX UM3486 EEPA XX E 3 6 A I 4 5 GN XX: Week Code UM3483EEPA IP8 XX: Week Code UM3486EEPA IP8 Rev.3 ec.214 2/18

3 Absolute Maximum Ratings Symbol Parameter Value Unit V CC Supply Voltage +7 V P Control Input Voltage (/RE, E) -.3V to (V CC +.3V) V river Input Voltage (I) -.3V to (V CC +.3V) V river Output Voltage (A, B) -7 to +12 V Receiver Input Voltage (A, B) -7 to +12 V Receiver Output Voltage (RO) -.3V to (V CC +.3V) V Continuous Power issipation at TA = 7 C IP8 727 SOP8 471 T A Ambient Temperature -4 to +85 C T STG Storage Temperature Range -65 to +16 C T L Lead Temperature for Soldering 1 seconds +3 C C Electrical Characteristics (V CC = +3V to 5.5V, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) mw Parameter Symbol Test Conditions Min Typ Max Unit SUPPLY CURRENT No load, E=V CC,.15 1 Supply Current I CC I = GN /RE=V or V CC ma or V CC E=V, /RE=V.15 1 Supply Current in Shutdown Mode I SHN E=V, /RE=V CC, I=V CC or V 1 µa LOGIC Input High Voltage V IH E, I, /RE 2. V Input Low Voltage V IL E, I, /RE.8 V Logic Input Current I IN1 E, I, /RE 1 µa river No Load V CC =3.3V 3.3 Figure 1 V CC =5V 5 ifferential river Output Change in Magnitude of river ifferential Output Voltage for Complementary Output States (Note 1) river Common-Mode Output Voltage Change in Magnitude of Common-Mode Output Voltage (Note 1) river Short-Circuit Output Current V O R L =54Ω Figure 1 R L =6Ω Figure 1 V CC =3.3V 1.2 V CC =5V 1.5 V CC =3.3V 1.3 V CC =5V 1.5 ΔV O R L =54Ω or 1Ω, Figure 1.2 V V OC R L =54Ω or 1Ω, Figure 1 3 V ΔV OC R L =54Ω or 1Ω, Figure 1.2 V I OS V = -7V -25 V = 12V Rev.3 ec.214 3/18 V ma

4 C Electrical Characteristics (Continued) (V CC = +3V to 5.5V, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) RECEIVER Parameter Symbol Test Conditions Min Typ Max Unit Receiver ifferential Threshold Voltage V TH -7V V CM 12V V Receiver Input Hysteresis ΔV TH V CM =V 25 mv Receiver Input Resistance R IN -7V V CM 12V 96 kω Input Current (A, B) I IN2 E=V, V CC =V or +3V to 5.5V V IN = 12V 1 V IN = -7V -.8 ma Receiver Output High Voltage V OH I =-1.5mA, V I =2mV, Figure 2 Vcc-1.5 V Receiver Output Low Voltage V OL I =2.5mA, V I =2mV, Figure 2.4 V Three-State (High Impedance) Output Current at Receiver I OZR V V V CC 1 µa Receiver Short-Circuit Output Current I OSR V V RO V CC ±2 ±6 ma ES Protection ES Protection for A, B Human Body Model ±15 IEC Air ischarge ±15 IEC Contact ischarge ±8 kv Rev.3 ec.214 4/18

5 river Switching Characteristics (UM3483E) (V CC = +3V to 5.5V, T A = +25 C.) UM3483E/UM3486E Parameter Symbol Test Conditions Min Typ Max Unit Maximum ata Rate f MAX 5 kbps river ifferential Output elay t R L =6Ω, Figure ns river ifferential Output Transition Time t T R L =6Ω, Figure ns river Propagation elay, Low-to-High Level river Propagation elay, High-to-Low Level t PLH t PHL river Propagation elay Skew (Note 2) river-output Enable/isable Times t PLH R L =27Ω, Figure ns t PHL R L =27Ω, Figure ns t PS R L =27Ω, Figure ns river Output Enable Time to Low Level t PZL R L =11Ω, Figure ns river Output Enable Time to High Level t PZH R L =11Ω, Figure ns river Output isable Time from High Level river Output isable Time from Low Level river Output Enable Time from Shutdown to Low Level river Output Enable Time from Shutdown to High Level river Switching Characteristics (UM3486E) (V CC = +3V to 5.5V, T A = +25 C.) t PHZ R L =11Ω, Figure ns t PLZ R L =11Ω, Figure ns t PSL R L =11Ω, Figure ns t PSH R L =11Ω, Figure ns Parameter Symbol Test Conditions Min Typ Max Unit Maximum ata Rate f MAX 25 kbps river ifferential Output elay t R L =6Ω, Figure ns river ifferential Output Transition Time t T R L =6Ω, Figure ns river Propagation elay, Low-to-High Level river Propagation elay, High-to-Low Level t PLH t PHL river Propagation elay Skew (Note 2) river-output Enable/isable Times t PLH R L =27Ω, Figure ns t PHL R L =27Ω, Figure ns t PS R L =27Ω, Figure ns river Output Enable Time to Low Level t PZL R L =11Ω, Figure ns river Output Enable Time to High Level t PZH R L =11Ω, Figure ns river Output isable Time from High Level river Output isable Time from Low Level river Output Enable Time from Shutdown to Low Level river Output Enable Time from Shutdown to High Level t PHZ R L =11Ω, Figure ns t PLZ R L =11Ω, Figure ns t PSL R L =11Ω, Figure ns t PSH R L =11Ω, Figure ns Rev.3 ec.214 5/18

6 Receiver Switching Characteristics (V CC = +3V to 5.5V, T A = +25 C.) Parameter Symbol Test Conditions Min Typ Max Unit Time to Shutdown Receiver Propagation elay, Low-to-High Level Receiver Propagation elay, High-to-Low Level t RPLH t RPHL Receiver Propagation elay Skew Receiver Output Enable Time to Low Level Receiver Output Enable Time to High Level Receiver Output isable Time from High Level Receiver Output isable Time from Low Level Receiver Output Enable Time from Shutdown to Low Level Receiver Output Enable Time from Shutdown to High Level t SHN t RPLH t RPHL t RPS t PRZL t PRZH t PRHZ t PRLZ t PRSL t PRSH UM3483E/UM3486E (Note 3) ns V I = to 3.V, C L =15pF, Figure ns UM3483E V I = to 3.V, C L =15pF, Figure ns UM3483E V I = to 3.V, C L =15pF, Figure 7 3 ns UM3483E C L =15pF, Figure 8, UM3483E/UM3486E 2 1 ns C L =15pF, Figure 8, UM3483E/UM3486E 2 1 ns C L =15pF, Figure 8, UM3483E/UM3486E 3 2 ns C L =15pF, Figure 8, UM3483E/UM3486E 3 2 ns C L =15pF, Figure 8, UM3483E/UM3486E 2 1 ns C L =15pF, Figure 8, UM3483E/UM3486E 2 1 ns Note 1: ΔV O and ΔV OC are the changes in V O and V OC, respectively, when the I input changes state. Note 2: Measured on t PLH (A) t PHL (A) and t PLH (B) t PHL (B). Note 3: The transceivers are put into shutdown by bringing /RE high and E low. If the inputs are in this state for less than 8ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 3ns, the parts are guaranteed to have entered shutdown. See Low-Power Shutdown Mode section. Rev.3 ec.214 6/18

7 Typical Operating Characteristics (V CC =+3.3V, T A =+25ºC, unless otherwise noted.) Supply Current vs. Temperature E=1, /RE=, I=1 Supply Current vs. Temperature E=1, /RE=, I= Output Current vs. Receiver Output High Voltage Output Current vs. Receiver Output Low Voltage Receiver Output High Voltage vs. Temperature Receiver Output Low Voltage vs. Temperature river ifferential Output Voltage vs. Temperature I=1 river ifferential Output Voltage vs. Temperature I= Rev.3 ec.214 7/18

8 Typical Operating Characteristics (Continued) (V CC =+3.3V, T A =+25ºC, unless otherwise noted.) ifferential Output Current vs. ifferential Output Voltage Shutdown Current vs. Temperature A B Short-Circuit Current vs. Temperature I=1 A B Short-Circuit Current vs. Temperature I= RO Short-Circuit Current vs. Temperature R=1 RO Short-Circuit Current vs. Temperature R= Rev.3 ec.214 8/18

9 Typical Operating Characteristics (Continued) (V CC =+5.V, T A =+25ºC, unless otherwise noted.) Supply Current vs. Temperature E=1, /RE=, I=1 Supply Current vs. Temperature E=1, /RE=, I= Output Current vs. Receiver Output High Voltage Output Current vs. Receiver Output Low Voltage Receiver Output High Voltage vs. Temperature Receiver Output Low Voltage vs. Temperature river ifferential Output Voltage vs. Temperature I=1, RL=54Ω river ifferential Output Voltage vs. Temperature I=, RL=54Ω Rev.3 ec.214 9/18

10 Typical Operating Characteristics (Continued) (V CC =+5.V, T A =+25ºC, unless otherwise noted.) ifferential Output Current vs. ifferential Output Voltage Shutdown Current vs. Temperature A B Short-Circuit Current vs. Temperature I=1 A B Short-Circuit Current vs. Temperature I= RO Short-Circuit Current vs. Temperature R=1 RO Short-Circuit Current vs. Temperature R= Rev.3 ec.214 1/18

11 Pin escription Pin Number Symbol Function 1 RO 2 RE 3 E Receiver Output. If A>B by -5mV, RO will be high; if A<B by 2mV, RO will be low. Receiver Output Enable. RO is enabled when RE is low; RO is high impedance when RE is high. rive RE high and E low to enter low-power shutdown mode. river Output Enable. The driver outputs are enabled by bringing E high. They are high impedance when E is low. If RE is high and E is low, the device will enter a low-power shutdown mode. If the driver outputs are enabled, the parts function as line drivers. While they are high impedance, they function as line receivers if RE is low. 4 I river Input. A low on I forces output A low and output B high. Similarly, a high on I forces output A high and output B low. 5 GN Ground 6 A Non-inverting Receiver Input and Non-inverting river Output 7 B Inverting Receiver Input and Inverting river Output. 8 V CC Positive Supply: 3.V V CC 5.5V RS-485 Communication Function Table Table1. Transmitting RE INPUTS PUTS E I B A MOE X Normal X 1 1 Normal X High-Z High-Z Normal 1 X High-Z High-Z Shutdown X=on t care; High-Z=High impedance Table2. Receiving RE INPUTS PUTS E A, B RO MOE X >-5mV 1 Normal X <-2mV Normal X Inputs Open 1 Normal 1 X High-Z Shutdown X=on t care; High-Z=High impedance Rev.3 ec /18

12 Test Circuit R L 2 VI R V O V CC 2 R L V OC VOL IOL (+) VOH IOH (-) Figure 1. river V O and V OC Figure 2. Receiver V OH and V OL 3V IN 1.5V 1.5V C L t t GENERATOR (NOTE 4) 5Ω V CC R L 6Ω C L C L=15pF (NOTE 5) 1% 5% 9% 9% 5% 1% 2.V -2.V t T t T Figure 3. river ifferential Output elay and Transition Times 3V VOM IN 1.5V 1.5V R L 27Ω V S1 tplh tphl VOH GENERATOR (NOTE 4) 5Ω CL=15pF (NOTE 5) A VOM VOM VCC VOL VOM VOH VOL 2 tphl tplh VOH B VOM VOM Figure 4. river Propagation Times VOL S1 3V OR 3V IN 1.5V 1.5V C L=5pF (NOTE 5) R L 11Ω t PZH t PHZ GENERATOR (NOTE 4) 5Ω V OM.25V V OH VOM VOH VOL 2 Figure 5. river Enable and isable Times (t PZH, t PSH, t PHZ ) Rev.3 ec /18

13 VCC 3V OR 3V S1 R L 11Ω IN 1.5V 1.5V tpsl tplz CL=5pF (NOTE 5) VCC GENERATOR (NOTE 4) 5Ω VOM.25V VOL Figure 6. river Enable and isable Times (t PZL, t PSL, t PLZ ) GENERATOR (NOTE 4) 5Ω V I R C L=15pF (NOTE 5) IN 1.5V 1.5V 3.V t RPLH t RPHL V CC 1.5V V V CC OM 2 Figure 7. Receiver Propagation elay V OM V OM 1.5V -1.5V S3 VI R 1k S1 S2 VCC CL (NOTE 5) GENERATOR (NOTE 4) 5Ω IN 1.5V 3V S1 OPEN S2 CLOSE S3=1.5V IN 1.5V 3V S1 CLOSE S2 OPEN S3=-1.5V tprzh tprzl tprsh tprsl VOH VCC 1.5V 1.5V VOL IN 1.5V 3V S1 OPEN S2 CLOSE S3=1.5V IN 1.5V 3V S1 CLOSE S2 OPEN S3=-1.5V tprhz tprlz.25v VOH VCC.25V VOL Figure 8. Receiver Enable and isable Times Note 4: The input pulse is supplied by a generator with the following characteristics: f=25khz, 5% duty cycle, t r 6.ns, z o =5Ω. Note 5: C L includes probe and stray capacitance. Rev.3 ec /18

14 Typical Operating Circuit I E B A 12ohm B A B A 12ohm B A E I RO RE R R RO RE Master Node R R Terminal Slave Node I E RO RE I E RO RE Slave Node 1 Slave Node N Figure 9. Typical Half-uplex RS-485 Network etail escription The UM3483E, UM3486E are low-power transceivers for RS-485 communications. The UM3483E can transmit and receive at data rates up to 5kbps, and the UM3486E at up to 2.5Mbps. The UM3483E, UM3486E are half-duplex. river Enable (E) and Receiver Enable (RE ) pins are included on the UM3483E, UM3486E. When disabled, the driver and receiver outputs are high impedance. Fail-Safe The UM3483E, UM3486E guarantees a logic-high receiver 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 -5mV and -2mV. If the differential receiver input voltage (A-B) is greater than or equal to -5mV, RO is logic high. If A-B is less than or equal to -2mV, RO is logic low. In the case of a terminated bus with all transmitters disabled, the receiver s differential input voltage is pulled to V by the termination. With the receiver thresholds of the UM3483E, UM3486E, this results in a logic high with a 5mV minimum noise margin. Unlike previous fail-safe devices, the -5mV to -2mV threshold complies with the ±2mV EIA/TIA-485 standard. ±15kV ES Protection As with all Union devices, ES-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs of the UM3483E, UM3486E have extra protection against static electricity. Union s engineers have developed state-of-the-art structures to protect these pins against ES of ±15kV without damage. The ES-protected pins are tested with reference to the ground pin in a power-down condition. They are tested to ±15kV using the Human Body Model. Applications Information 256 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 Union family of transceivers have a 1/8 unit load receiver input impedance (96kΩ), allowing up to 256 transceivers to be connected in parallel on one communication line. Any combination of these devices and/or other RS-485 transceivers with a total of 32 unit loads or less can be connected to the line. Rev.3 ec /18

15 Reduced EMI and Reflections The UM3483E, UM3486E are slew-rate-limited, minimizing EMI and reducing reflections caused by improperly terminated cables. 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=t RISE /(1 1.5ns/ft) Where t RISE is the transmitter s rise time. A system can work well with longer unterminated stubs, even with severe reflections, if the waveform settles out before the UART samples them. Low-Power Shutdown Mode Low-power shutdown mode is initiated by bringing both RE device typically draws only 1μA of supply current. RE high and E low. In shutdown, the and E may be driven simultaneously; the parts are guaranteed not to enter shutdown if RE is high and E is low for less than 5ns. If the inputs are in this state for at least 6ns, the parts are guaranteed to enter shutdown. Enable times t PZH and t PZL in the Switching Characteristics tables assume the part was not in a low-power shutdown state. Enable times t PSH and t PSL assume the parts were shut down. It takes drivers and receivers longer to become enabled from low-power shutdown mode (t PSH, t PSL ) than from driver/receiver-disable mode (t PZH, t PZL ). river Output Protection Two mechanisms prevent excessive output current and power dissipation caused by faults or bus contention. First, a foldback current limit on the output stage, provides immediate protection against short circuits over the whole common-mode voltage range. Second, a thermal shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature becomes excessive. Propagation elay Skew time is simply the difference between the low-to-high and high-to-low propagation delay. Small driver/receiver skew times help maintain a symmetrical mark-space ratio (5% duty cycle). The receiver skew time, t RPLH - t RPHL, is under 1ns (2ns for the UM3483E). The driver skew times 12ns for the UM3486E, and typically under 5ns for the UM3483E. Typical Applications The UM3483E, UM3486E transceivers are designed for bidirectional data communications on multipoint bus transmission lines. To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths of the main line should be kept as short as possible. The slew-rate-limited UM3483E and the partially slew-rate-limited UM3486E are more tolerant of imperfect termination. Rev.3 ec /18

16 Package Information Outline rawing SOP8 E1 A2 1 2 Top View b Side View e A1 E A c L θ End View IMENSIONS Symbol MILLIMETERS INCHES Min Max Min Max A A A b c E E e 1.27 (BSC).5 (BSC) L θ 8 8 Land Pattern NOTES: 1. Compound dimension: ; 2. Unit: mm; 3. General tolerance ±.5mm unless otherwise specified; 4. The layout is just for reference. Tape and Reel Orientation XXXXXX XXXX XXXX Rev.3 ec /18

17 Outline rawing L A 1 A2 A1 b1 b e A3 E E1 ea C eb IP8 IMENSIONS Symbol MILLIMETERS INCHES Min Max Min Max A A A A b b C E E e ea eb L Tape and Reel Orientation XXXXXX XXXX XX Rev.3 ec /18

18 IMPORTANT NOTICE UM3483E/UM3486E The information in this document has been carefully reviewed and is believed to be accurate. Nonetheless, this document is subject to change without notice. Union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contained information, or to notify a person or organization of any update. Union reserves the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. Union Semiconductor, Inc Add: Unit 66, No.57 Shengxia Road, Shanghai 2121 Tel: Fax: Website: Rev.3 ec /18

ILX485. Low-Power, RS-485/RS-422 Transceivers TECHNICAL DATA

ILX485. Low-Power, RS-485/RS-422 Transceivers TECHNICAL DATA TECHNICAL DATA Low-Power, RS-485/RS-422 Transceivers ILX485 Description The ILX485 is low-power transceivers for RS-485 and RS- 422 communication. IC contains one driver and one receiver. The driver slew