UM3483E_15 UNIONSEMI | Alldatasheet
Document overview
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Technical content
Features
Telecommunications Low-Power RS-485 Transceivers Integrated Services Digital Networks Industrial-Control Local Area Networks Transceivers for EMI-Sensitive
Applications
Packet Switching Level Translators ESD Protection for RS-485 I/O Pins ±15kV—Human Body Model ±15kV—IEC61000-4-2, Air-Gap Discharge ±8kV—IEC61000-4-2, Contact Discharge 3V to 5.5V Supply Voltage Range Enhanced Slew-Rate Limiting Facilitates Error-Free Data 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 Driver Overload Protection
http://www.union-ic.com Rev.04 Sep.2015 2/18 UM3483E/UM3486E
Ordering Information
Part Number Operating Temperature Mark Code Package Type UM3483EESA -40° C to +85°C UM3483EESA SOP8 UM3483EEPA -40° C to +85°C UM3483EEPA DIP8 UM3486EESA -40° C to +85°C UM3486EESA SOP8 UM3486EEPA -40° C to +85°C UM3486EEPA DIP8 Selection Guide Part Number Guaranteed Date Rate (Mbps) Low-Power Shutdown Slew-Rate Limited Driver/ Receiver Enable Shutdown Current (μA) Transceivers On Bus ± 15kV ESD Protection UM3483E 0.5 Yes Yes Yes 1 256 Yes UM3486E 2.5 Yes Yes Yes 1 256 Yes Pin Configurations Top View VCCRO DE DI GND A BRE UM3483 EESA XX XX: Week Code UM3483EESA SOP8 UM3486 EESA XX XX: Week Code UM3486EESA SOP8 VCCRO DE DI GND A BRE UM3483 EEPA XX XX: Week Code UM3483EEPA DIP8 UM3486 EEPA XX XX: Week Code UM3486EEPA DIP8
http://www.union-ic.com Rev.04 Sep.2015 5/18 UM3483E/UM3486E Driver Switching Characteristics (UM3483E) (VCC = +3V to 5.5V, TA = +25° C.) Parameter Symbol Test Conditions Min Typ Max Unit Maximum Data Rate fMAX 500 kbps Driver Differential Output Delay tDD RL=60Ω, Figure 3 250 500 1000 ns Driver Differential Output Transition Time tTD RL=60Ω, Figure 3 250 500 750 ns Driver Propagation Delay, Low-to-High Level tPLH RL=27Ω, Figure 4 250 550 1000 ns Driver Propagation Delay, High-to-Low Level tPHL RL=27Ω, Figure 4 250 550 1000 ns | tPLH – tPHL | Driver Propagation Delay Skew (Note 2) tPDS RL=27Ω, Figure 4 10 30 ns Driver-Output Enable/Disable Times Driver Output Enable Time to Low Level tPZL RL=110Ω, Figure 6 100 2500 ns Driver Output Enable Time to High Level tPZH RL=110Ω, Figure 5 100 2500 ns Driver Output Disable Time from High Level tPHZ RL=110Ω, Figure 5 100 100 ns Driver Output Disable Time from Low Level tPLZ RL=110Ω, Figure 6 100 100 ns Driver Output Enable Time from Shutdown to Low Level tPSL RL=110Ω, Figure 6 500 2500 ns Driver Output Enable Time from Shutdown to High Level tPSH RL=110Ω, Figure 5 500 2500 ns Driver Switching Characteristics (UM3486E) (VCC = +3V to 5.5V, TA = +25° C.) Parameter Symbol Test Conditions Min Typ Max Unit Maximum Data Rate fMAX 2500 kbps Driver Differential Output Delay tDD RL=60Ω, Figure 3 20 50 100 ns Driver Differential Output Transition Time tTD RL=60Ω, Figure 3 20 50 100 ns Driver Propagation Delay, Low-to-High Level tPLH RL=27Ω, Figure 4 25 55 100 ns Driver Propagation Delay, High-to-Low Level tPHL RL=27Ω, Figure 4 25 55 100 ns | tPLH – tPHL | Driver Propagation Delay Skew (Note 2) tPDS RL=27Ω, Figure 4 2 10 ns Driver-Output Enable/Disable Times Driver Output Enable Time to Low Level tPZL RL=110Ω, Figure 6 60 100 ns Driver Output Enable Time to High Level tPZH RL=110Ω, Figure 5 60 100 ns Driver Output Disable Time from High Level tPHZ RL=110Ω, Figure 5 60 100 ns Driver Output Disable Time from Low Level tPLZ RL=110Ω, Figure 6 60 100 ns Driver Output Enable Time from Shutdown to Low Level tPSL RL=110Ω, Figure 6 500 800 ns Driver Output Enable Time from Shutdown to High Level tPSH RL=110Ω, Figure 5 500 800 ns
http://www.union-ic.com Rev.04 Sep.2015 7/18 UM3483E/UM3486E Typical Operating Characteristics (VCC=+3.3V, TA=+25ºC, unless otherwise noted.) Supply Current vs. Temperature DE=1, /RE=0, DI=1 Supply Current vs. Temperature DE=1, /RE=0, DI=0 Receiver Output High Voltage vs. Temperature Receiver Output Low Voltage vs. Temperature Output Current vs. Receiver Output High Voltage Output Current vs. Receiver Output Low Voltage Driver Differential Output Voltage vs. Temperature DI=1 Driver Differential Output Voltage vs. Temperature DI=0
http://www.union-ic.com Rev.04 Sep.2015 8/18 UM3483E/UM3486E Typical Operating Characteristics (Continued) (VCC=+3.3V, TA=+25ºC, unless otherwise noted.) Differential Output Current vs. Differential Output Voltage Shutdown Current vs. Temperature A B Short-Circuit Current vs. Temperature DI=1 A B Short-Circuit Current vs. Temperature DI=0 RO Short-Circuit Current vs. Temperature R0=1 RO Short-Circuit Current vs. Temperature R0=0
http://www.union-ic.com Rev.04 Sep.2015 9/18 UM3483E/UM3486E Typical Operating Characteristics (Continued) (VCC=+5.0V, TA=+25ºC, unless otherwise noted.) Supply Current vs. Temperature DE=1, /RE=0, DI=1 Supply Current vs. Temperature DE=1, /RE=0, DI=0 Receiver Output High Voltage vs. Temperature Receiver Output Low Voltage vs. Temperature Output Current vs. Receiver Output High Voltage Output Current vs. Receiver Output Low Voltage Driver Differential Output Voltage vs. Temperature DI=1, RL=54Ω Driver Differential Output Voltage vs. Temperature DI=0, RL=54Ω
http://www.union-ic.com Rev.04 Sep.2015 10/18 UM3483E/UM3486E Typical Operating Characteristics (Continued) (VCC=+5.0V, TA=+25ºC, unless otherwise noted.) A B Short-Circuit Current vs. Temperature DI=1 A B Short-Circuit Current vs. Temperature DI=0 RO Short-Circuit Current vs. Temperature R0=1 RO Short-Circuit Current vs. Temperature R0=0 Differential Output Current vs. Differential Output Voltage Shutdown Current vs. Temperature
http://www.union-ic.com Rev.04 Sep.2015 11/18 UM3483E/UM3486E Pin Description Pin Number Symbol Function 1 RO Receiver Output. If A＞B by -50mV, RO will be high; if A ＜B by 200mV, RO will be low. 2 RE Receiver Output Enable. RO is enabled when RE is low; RO is high impedance when RE is high. Drive RE high and DE low to enter low-power shutdown mode. 3 DE Driver Output Enable. The driver outputs are enabled by bringing DE high. They are high impedance when DE is low. If RE is high and DE 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 DI Driver Input. A low on DI forces output A low and output B high. Similarly, a high on DI forces output A high and output B 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≤5.5V RS-485 Communication Function Table Table1. Transmitting INPUTS OUTPUTS MODE RE DE DI B A X 1 1 0 1 Normal X 1 0 1 0 Normal 0 0 X High-Z High-Z Normal 1 0 X High-Z High-Z Shutdown X=Don’t care; High-Z=High impedance Table2. Receiving INPUTS OUTPUTS MODE RE DE A, B RO
0 X >-50mV 1 Normal
0 X <-200mV 0 Normal
0 X Inputs Open 1 Normal
X=Don’t care; High-Z=High impedance
Figure 1. Driver VOD and VOC Figure 2. Receiver VOH and VOL Figure 3. Driver Differential Output Delay and Transition Times Figure 4. Driver Propagation Times
0 OR 3V
Figure 5. Driver Enable and Disable Times (tPZH, tPSH, tPHZ)
Figure 6. Driver Enable and Disable Times (tPZL, tPSL, tPLZ) Figure 7. Receiver Propagation Delay Figure 8. Receiver Enable and Disable Times 50% duty cycle, tr≤6.0ns, zo=50Ω. Note 5: CL includes probe and stray capacitance.
Figure 9. Typical Half-Duplex RS-485 Network transmitters disabled, the receiver ’s differential input voltage is pulled to 0V by the termination. complies with the ±200mV EIA/TIA-485 standard. receiver inputs of the UM3 483E, UM3 486E have extra p rotection against static electricity. power-down condition. They are tested to ± 15kV using the Human Body Model.
256 Transceivers on the Bus
total of 32 unit loads or less can be connected to the line.
http://www.union-ic.com Rev.04 Sep.2015 15/18 UM3483E/UM3486E 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=tRISE/(10× 1.5ns/ft) Where tRISE 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 high and DE low. In shutdown, the device typically draws only 1μA of supply current. RE and DE may be driven simultaneously; the parts are guaranteed not to enter shutdown if RE is high and DE is low for less than 50ns. If the inputs are in this state for at least 600ns, the parts are guaranteed to enter shutdown. Enable times tPZH and tPZL in the Switching Characteristics tables assume the part was not in a low -power shutdown state. Enable times t PSH and tPSL 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 (tPZH, tPZL). Driver 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 therm al shutdown circuit, forces the driver outputs into a high -impedance state if the die temperature becomes excessive. Propagation Delay 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 (50% duty cycle). The receiver skew time, |t RPLH - tRPHL|, is under 10ns (20ns for the UM3483E). The driver skew times 12ns for the UM3486E, and typically under 50ns for the UM3483E. Typical Applications The UM3483E, UM3 486E 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 li ne 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.
http://www.union-ic.com Rev.04 Sep.2015 16/18 UM3483E/UM3486E
Package Information
D e E 1 2 Top View L c End View b A Side View θ DIMENSIONS Symbol MILLIMETERS INCHES Min Max Min Max A 1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.33 0.51 0.013 0.020 c 0.170 0.250 0.006 0.010 D 4.700 5.100 0.185 0.200 E 3.800 4.000 0.150 0.157 E1 5.800 6.200 0.228 0.244 e 1.270 (BSC) 0.050 (BSC) L 0.400 1.270 0.016 0.050 θ 0° 8° 0° 8° Land Pattern 4.95 1.30 1.27 0.50 NOTES: 1. Compound dimension: 4.90×3.90 ; 2. Unit: mm; 3. General tolerance ± 0.05mm unless otherwise specified; 4. The layout is just for reference. Tape and Reel Orientation XXXXXX XXXX XX
http://www.union-ic.com Rev.04 Sep.2015 17/18 UM3483E/UM3486E DIP8 Outline Drawing D AL e b E eA eB C DIMENSIONS Symbol MILLIMETERS INCHES Min Max Min Max A - 5.08 - 0.200 A1 0.38 - 0.015 - A2 3.18 4.45 0.125 0.175 A3 1.40 2.03 0.055 0.080 b 0.41 0.56 0.016 0.022 b1 1.14 1.65 0.045 0.065 C 0.20 0.30 0.008 0.012 D 8.84 9.91 0.348 0.390 D1 0.13 2.03 0.005 0.080 E 7.62 8.26 0.300 0.325 E1 6.10 7.87 0.240 0.310 e 2.54 - 0.100 - eA 7.62 - 0.300 - eB - 10.16 - 0.400 L 2.92 3.81 0.115 0.150
http://www.union-ic.com Rev.04 Sep.2015 18/18 UM3483E/UM3486E GREEN COMPLIANCE Union Semiconductor is committed to environmental excellence in all aspects of its operations including meeting or exceeding regulatory requirements with respect to the use of hazardous substances. Numerous succes sful programs have been implemented to reduce the use of hazardous substances and/or emissions. All Union components are compliant with the RoHS directive, which helps to support customers in their compliance with environmental directives. For more green c ompliance information, please visit: http://www.union-ic.com/index.aspx?cat_code=RoHSDeclaration IMPORTANT NOTICE The information in this document has been carefully reviewed a nd 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 i nformation, 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 606, No.570 Shengxia Road, Shanghai 201210 Tel: 021-51093966 Fax: 021-51026018 Website: www.union-ic.com