UM3488/UM3491 +3.3V Low Power，±15kV ESD-Protected, Fail-Safe, RS-422 Transceivers UM3488EESA SOP8 UM3488EEPA DIP8 UM3491EESE SOP14 UM3491EEPE DIP14 General Description The UM3488/UM3491 is ±15kV electrostatic discharge (ESD)-protected, high-speed transceivers for RS-422 communication that contain one driver and one receiver. The UM3491 contains an additional receiver and driver enable control. The device features fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means that the receiver output will be a logic high if all transmitters on a terminated bus are disabled (high impedance). The UM3488/UM3491 allows transmit speeds up to 10Mbps. The device features enhanced ESD protection. All transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model. These transceivers typically draw 180µA of supply current when unloaded, or when fully loaded with the drivers disabled. The device has a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. The UM3488/UM3491 is intended for full-duplex communications. Applications Features RS-422 Communications Level Translators Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks ESD Protection for RS-422 I/O Pins ±15kV, Human Body Model True Fail-Safe Receiver while Maintaining EIA/TIA-422 Compatibility Maximum Data Rate up to 10Mbps Error-Free Data Transmission 1nA Low-Current Shutdown Mode (UM3491) Allow up to 256 Transceivers on the Bus Selector Guide Part Number Half/Full Duplex Data Rate (Mbps) SlewRate Limited LowPower Shutdown Receiver/ Driver Enable Quiescent Current (µA) Transceivers On Bus Pin Count UM3488 full 10 Yes No No 180 256 8 UM3491 full 10 Yes Yes Yes 180 256 14 Ordering Information Part Number Temperature Range Packaging Type Shipping Qty UM3488EESA -40°C to +85°C SOP8 2500pcs/13 Inch Tape & Reel UM3488EEPA -40°C to +85°C DIP8 50pcs/Tube UM3491EESE -40°C to +85°C SOP14 2500pcs/13 Inch Tape & Reel UM3491EEPE -40°C to +85°C DIP14 25pcs/Tube ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 1/17 UM3488/UM3491 Pin Configurations VCC 1 RO 2 DI 3 Top View 8 A 7 B 6 Z 5 Y R UM3488 EESA XX UM3488 EEPA XX D GND 4 14 VCC 13 NC NC 1 RO 2 RE 3 12 A DE 4 11 B DI 5 GND 6 GND 7 R D 10 Z 9 Y 8 NC XX: Week Code UM3488EESA SOP8 XX: Week Code UM3488EEPA DIP8 XX: Week Code UM3491EESE SOP14 XX: Week Code UM3491EEPE DIP14 Absolute Maximum Ratings Symbol Parameter Value Unit VCC Supply Voltage +7 V Control Input Voltage (R E , DE) -0.3V to (VCC + 0.3V) V Driver Input Voltage (DI) -0.3V to (VCC + 0.3V) V Driver Output Voltage (A, B, Y, Z) ±13 V Receiver Input Voltage (A, B) ±25 V Receiver Output Voltage (RO) -0.3V to (VCC + 0.3V) V 8-Pin SO (derate 9.09mW/°C above +70°C) 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) 14-Pin Plastic DIP (derate 10.0mW/°C above +70°C) 520 727 800 14-Pin SO (derate 8.33mW/°C above +70°C) 667 TA Ambient Temperature -40 to +85 °C TSTG Storage Temperature Range -65 to +150 °C TL Lead Temperature for Soldering 10 seconds +300 °C ______ PD mW ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 2/17 UM3488/UM3491 DC Electrical Characteristics (VCC = +3.3V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 1) Parameter DRIVER Symbol Test Conditions Min Typ Max Unit VCC V Differential Driver Output (No Load) VOD1 Figure 3 Differential Driver Output VOD2 Figure 3, R = 50Ω 1.8 VCC V Differential Driver Output VOD3 Figure 3, R = 27Ω 1.3 VCC V ΔVOD Figure 3, R = 50Ω 0.2 V VOC Figure 3, R = 50Ω 3.0 V Input High Voltage VIH DE, DI, R E Input Low Voltage VIL DE, DI, R E DI Input Hysteresis VHYS Driver Short-Circuit Output Current (Note 3) VOD1 Change-in-Magnitude of Differential Output Voltage (Note 2) Driver Common-Mode Output Voltage ______ 2.0 V ______ 0.8 mV 100 -7V≤VOUT≤VCC V -250 mA 0V≤VOUT≤12V 250 RECEIVER Input Current (A and B) IIN DE = GND, VCC = GND or 3.465V VIN = 12V 125 VIN = -7V -75 µA Receiver Differential Threshold Voltage VTH Receiver Input Hysteresis ΔVTH Receiver Output High Voltage VOH IO = -4mA, VID = -50mV Receiver Output Low Voltage VOL IO = 4mA, VID = -200mV 0.4 V Three-State Output Current at Receiver IOZR 0.4V ≤ VO ≤ 2.4V ±1 µA Receiver Input Resistance RIN -7V≤VCM≤12V 96 IOSR 0V≤VRO ≤VCC ±7 Receiver Output Short Circuit Current SUPPLY CURRENT Supply Current ICC -7V≤VCM≤12V -200 -125 -50 25 No load, DE =DI=GND or VCC ______ R E =VCC mV mV VCC -0.4 V kΩ ±95 20 60 180 300 mA µA ______ R E =GND ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 3/17 UM3488/UM3491 Supply Current in Shutdown Mode ESD Protection for Y, Z, A, B ISHDN ______ DE = GND, V R E = VCC 0.001 Human Body Model ±15 10 µA kV Note 1: 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. Note 2: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes state. Note 3: Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during current limiting. ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 4/17 UM3488/UM3491 Switching Characteristics (VCC = +3.3V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) Parameter Driver Input-to-Output Symbol tDPLH tDPHL Driver Output Skew | tDPLH - tDPHL | tDSKEW Test Conditions Figures 5 and 7, RDIFF = 54Ω, CL1 = CL2 = 100pF Min Typ Max 10 30 60 10 30 60 10 25 ns 15 30 ns 10 Mbps ns Figures 5 and 7, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 5 and 7, RDIFF = 54Ω, CL1 = CL2 = 100pF Unit Driver Rise or Fall Time tDR, tDF Maximum Data Rate fMAX Driver Enable to Output High tDZH Figures 6 and 8, CL = 100pF, S2 closed 40 70 ns Driver Enable to Output Low tDZL Figures 6 and 8, CL = 100pF, S1 closed 40 70 ns Driver Disable Time from Low tDLZ Figures 6 and 8, CL = 15pF, S1 closed 40 70 ns Driver Disable Time from High tDHZ Figures 6 and 8, CL = 15pF, S2 closed 40 70 ns Receiver Input to Output tRPLH, tRPHL Figures 9 and 11; | VID | ≥2.0V; rise and fall time of VID≤ 15ns 100 180 ns | tRPLH - tRPHL | Differential Receiver Skew tRSKD Figures 9 and 11; | VID | ≥2.0V; rise and fall time of VID≤ 15ns 13 Receiver Enable to Output Low tRZL Figures 4 and 10, CL = 100pF, S1 closed 40 100 ns Receiver Enable to Output High tRZH Figures 4 and 10, CL = 100pF, S2 closed 40 100 ns Receiver Disable Time from Low tRLZ Figures 4 and 10, CL = 100pF, S1 closed 40 100 ns Receiver Disable Time from High tRHZ Figures 4 and 10, CL = 100pF, S2 closed 40 100 ns Time to Shutdown tSHDN (Note 4) 200 600 ns Driver Enable from Shutdown to Output High tDZH(SHDN) Figures 6 and 8, CL = 15pF, S2 closed 40 200 ns Driver Enable from Shutdown to Output Low tDZL(SHDN) Figures 6 and 8, CL = 15pF, S1 closed 40 200 ns Receiver Enable from Shutdown- to-Output High tRZH(SHDN) Figures 4 and 10, CL = 100pF, S2 closed 150 500 ns Receiver Enable from Shutdown- to-Output Low Figures 4 and 10, CL = 100pF, S1 closed 150 500 ns tRZL(SHDN) 5 20 50 ns ______ Note 4: The device is put into shutdown by bringing R E high and DE low. If the enable inputs are in this state for less than 50ns, the device is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 600ns, the device is guaranteed to have entered shutdown. ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 5/17 UM3488/UM3491 Typical Operating Characteristics (VCC = +3.3V, TA = +25°C, unless otherwise noted.) Output Current vs.Receiver Output High Voltage 250 30 225 25 Output Current (μA) No Load Supply Current(μA) No Load Supply Current vs. Temperature 200 175 150 20 15 10 RE=L,DE=H RE=L,DE=H 125 5 100 0 -60 -40 -20 0 20 40 60 80 100 0 1 Temperature(℃) Output Current vs. Receiver Output Low Voltage 3 4 Receiver Output High Voltage vs. Temperature 60 Receiver Output High Voltage(V) 3 50 Output Current (μA) 2 Output High Voltage (V) 40 30 20 10 0 IRO=8mA 2.95 2.9 2.85 2.8 2.75 2.7 2.65 2.6 2.55 2.5 0 1 2 3 Output Low Voltage (V) 4 -60 -40 -20 0 20 40 60 80 100 Temperature(℃) ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 6/17 UM3488/UM3491 Typical Operating Characteristics (Continued) (VCC = +3.3V, TA = +25°C, unless otherwise noted.) Receiver Output Low Voltage vs. Temperature Driver Differential Output Voltage vs. Temperature 2 1.9 IRO=8mA 0.35 RT=54ohm 1.8 Output Voltage(V) Receiver Output Low Voltage(V) 0.4 0.3 0.25 0.2 1.7 1.6 1.5 1.4 1.3 1.2 0.15 1.1 0.1 1 -60 -40 -20 0 20 40 60 80 100 Temperature(℃) -60 -40 -20 0 20 40 60 80 Temperature(℃) Driver Output Current vs.Differential Output Voltage Output Current (mA) 100 10 1 0.1 0 0.5 1 1.5 2 2.5 3 3.5 Differential Output Voltage (V) ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 7/17 100 UM3488/UM3491 Pin Description Pin Number UM3488 UM3491 Symbol Function - 1 NC Not Connected 2 2 RO Receiver Output. When RE is low and if A - B ≥-50mV, RO will be high; if A - B ≤ -200mV, RO will be low. ______ ______ - 3 - Receiver Output Enable. Drive RE low to enable RO; RO is ______ ______ ______ RE high impedance when RE is high. Drive RE high and DE low to enter low-power shutdown mode. Driver Output Enable. Drive DE high to enable driver outputs. 4 DE 3 5 DI 4 6 GND These outputs are high impedance when DE is low. Drive RE high and DE low to enter low-power shutdown mode. Driver Input. With DE high, a low on DI forces non-inverting output low and inverting output high. Similarly, a high on DI forces non-inverting output high and inverting output low. Ground 4 7 GND Ground - 8 NC 5 9 Y Non-inverting Driver Output 6 10 Z Inverting Driver Output 7 11 B Inverting Receiver Input 8 12 A Non-inverting Receiver Input - 13 NC 1 14 VCC ______ Not Connected Not Connected Positive Supply 3.135V ≤ VCC≤ 3.465V Functions Tables TRANSMITTING ______ RE X X 0 1 INPUTS DE 1 1 0 0 OUTPUTS DI 1 0 X X Z 0 1 High-Z Y 1 0 High-Z Shutdown RECEIVING ______ RE 0 0 0 1 1 INPUTS DE X X X 1 0 A-B ≥-0.05V ≤-0.2V Open/Short X X OUTPUT RO 1 0 1 High-Z Shutdown ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 8/17 UM3488/UM3491 Typical Operating Circuit DE VCC RE VCC 4 14 Y 9 DI 5 Rt D R 10 RO Z 12 RO NC 2 A Rt R 1,8,13 DI D 11 B 3 6,7 GND RE GND DE Figure 1: UM3491 pin configuration and typical full-duplex operating circuit A RO RE DE DI 120ohm 120ohm Y 120ohm Z 120ohm B D R B Z R D Y Y D DI Z B A R DE RERO Y D DI Z B A DI DE RE RO A R DE RERO Figure 2: Typical Full-Duplex RS-422 Network ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 9/17 UM3488/UM3491 Detailed Description The UM3488/UM3491 high-speed transceivers for RS-422 communication contain one driver and one receiver. The device features fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled. The UM3488/UM3491 offer higher driver output slew-rate limits, allowing transmit speeds up to 10Mbps. The UM3488/UM3491 is full-duplex transceiver. It operates from a single +3.3V supply. Drivers are output short-circuit current limited. Thermal shutdown circuitry protects drivers against excessive power dissipation. When activated, the thermal shutdown circuitry places the driver outputs into a high- impedance state. Receiver Input Filtering The receivers of the UM3488/UM3491 incorporate input filtering in addition to input hysteresis. This filtering enhances noise immunity with differential signals that have very slow rise and fall times. Receiver propagation delay increases by 20% due to this filtering. Fail-Safe The UM3488/UM3491 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 -50mV and -200mV. If the differential receiver input voltage (A-B) is greater than or equal to -50mV, 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 is pulled to 0V by the termination. With the receiver thresholds of the UM3488/UM3491, this results in a logic high with a 50mV minimum noise margin. Unlike previous fail-safe devices, the -50mV to -200mV threshold complies with the ±200mV EIA/TIA-422 standard. ±15kV ESD Protection As with all Union devices, ESD-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 UM3488/UM3491 have extra protection against static electricity. Union’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage. The ESD-protected pins are tested with reference to the ground pin in a powered-down condition. They are tested to ±15kV using the Human Body Model. ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 10/17 UM3488/UM3491 Test Circuit Y 1K Test Point Receive Output R VCC S1 + CRL VOD 15pF R 1K VOC S2 Z Figure 3. Driver DC Test Load 3V DE RDIFF VOD2 VCC 500ohm Output Under Test CL1 Y DI Figure 4. Receiver Enable/Disable Timing Test Load S1 + CL Z S2 CL2 Figure 5. Driver Timing Test Circuit 3.3V DI 1.5V 3.3V 1.5V tDPLH 0V Z Figure 6. Driver Enable and Disable Timing Test Load 1/2VO Y,Z VOL VO Y 1.5V 1.5V DE 0V tDPHL tDZL(SHDN), tDZL 2.3V 1/2VO 90％ 10％ tDR VOL+0.5V Output Normally High VDIFF=V(Y)-V(Z) VO VDIFF 0 －VO tDLZ Output Normally Low Y,Z 90％ 10％ tSKEW=tDPLH-tDPHL VOH-0.5V 2.3V 0 tDZH(SHDN), tDZH tDF Figure 7. Driver Propagation Delays tDHZ Figure 8. Driver Enable and Disable Times 3.3V RE VOH RO VOL 1V A -1V B 1.5V OUTPUT tRPHL 1.5V 1.5V 1.5V 0V tRZL(SHDN), tRZL VCC 1.5V tRPLH RO INPUT VOL+0.5V Output Normally High VOH-0.5V 1.5V 0 tRZH(SHDN), tRZH Figure 9. Receiver Propagation Delays tRLZ Output Normally Low tRHZ Figure 10. Receiver Enable and Disable Times A 120ohm RO R RE B DATA IN B ATE R VD A Receiver Output DE Z DI Figure 11. Receiver Propagation Delay Test Circuit D 120ohm Y DATA OUT Figure 12: Line Repeater ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 11/17 UM3488/UM3491 Applications Information 256 Transceivers on the Bus The standard RS-422 receiver input impedance is 12kΩ (one-unit load), and the standard driver can drive up to 32 unit loads. The UM3491 has 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-422 transceivers with a total of 32 unit loads or less can be connected to the line. Reduced EMI and Reflections The UM3488/UM3491 is slew-rate limited, minimizing EMI and reducing reflections caused by improperly terminated cables. Its high-frequency harmonic components are much lower in amplitude, and the potential for EMI is significantly reduced. 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. Low-Power Shutdown Mode (UM3491) _____ Low-power shutdown mode is initiated by bringing both RE high and DE low. In shutdown, the _____ devices typically draw only 1nA 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 t ZH and t ZL in the Switching Characteristics tables assume the part was not in a low-power shutdown state. Enable times tZH(SHDN) and tZL(SHDN) assume the parts were shut down. It takes drivers and receivers longer to become enabled from low-power shutdown mode (tZH(SHDN), tZH(SHDN)) than from driver/receiver-disable mode (tZH, tZL). Driver Output Protection Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. The first, a foldback current limit on the output stage, provides immediate protection against short circuits over the whole common-mode voltage range. The second, a thermal shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature becomes excessive. Line Length vs. Data Rate The RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet, use the repeater application shown in Figure 12. ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 12/17 UM3488/UM3491 Package Information UM3488EESA SOP8 Outline Drawing c L D E E1 Symbol 1 2 θ e Top View A A2 End View A1 b Side View A A1 A2 b c D E E1 e L θ DIMENSIONS MILLIMETERS Min Max 1.350 1.750 0.100 0.250 1.350 1.550 0.33 0.51 0.170 0.250 4.700 5.100 3.800 4.000 5.800 6.200 1.270 (BSC) 0.400 1.270 0° 8° INCHES Min Max 0.053 0.069 0.004 0.010 0.053 0.061 0.013 0.020 0.006 0.010 0.185 0.200 0.150 0.157 0.228 0.244 0.050 (BSC) 0.016 0.050 0° 8° 4.95 1.30 Land Pattern 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 UM3488 EESA XX ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 13/17 UM3488/UM3491 UM3488EEPA DIP8 Outline Drawing D1 E E1 eA C D A1 L A3 A2 A eB b1 e b DIMENSIONS MILLIMETERS INCHES Symbol 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 Tape and Reel Orientation UM3488 EEPA XX ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 14/17 UM3488/UM3491 UM3491EESE SOP14 Outline Drawing Symbol D L INDEX Ø0.8±0.1 DEP0.2±0.1 θ2 E E1 θ1 e b c 0.25 M A3 A2 A1 A θ3 0.10 θ4 (L1) L2 A A1 A2 A3 b c D E E1 e L L1 L2 θ1 θ2 θ3 θ4 DIMENSIONS MILLIMETERS Min Max 1.350 1.750 0.100 0.250 1.250 1.650 0.550 0.750 0.360 0.490 0.170 0.250 8.530 8.730 5.800 6.200 3.800 4.000 1.270BSC 0.450 0.800 1.04REF 0.250BSC 6° 10° 6° 10° 5° 9° 5° 9° INCHES Min Max 0.053 0.069 0.004 0.010 0.050 0.066 0.022 0.030 0.014 0.020 0.006 0.010 0.341 0.349 0.228 0.244 0.152 0.160 0.050BSC 0.018 0.032 0.042REF 0.010BSC 6° 10° 6° 10° 5° 9° 5° 9° Land Pattern 4.95 1.30 0.50 NOTES: 1. Compound dimension: 8.63×3.90 ; 2. Unit: mm; 3. General tolerance ±0.05mm unless otherwise specified; 4. The layout is just for reference. 1.27 Tape and Reel Orientation UM3491EESE XX ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 15/17 UM3488/UM3491 UM3491EEPE DIP14 Outline Drawing D1 E E1 eA C D A1 L A3 A2 A eB e b1 b DIMENSIONS MILLIMETERS INCHES Symbol 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 18.67 19.43 0.735 0.765 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 Tape and Reel Orientation UM3491EEPE XX ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 16/17 UM3488/UM3491 IMPORTANT NOTICE 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 606, No.570 Shengxia Road, Shanghai 201210 Tel: 021-51093966 Fax: 021-51026018 Website: www.union-ic.com ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2015 17/17