UM488/UM491 ±15kV ESD-Protected, Fail-Safe, Slew-Rate-Limited RS-422 Transceivers in SOP8/DIP8/SOP14/DIP14 General Description The UM488/UM491 is ±15kV electrostatic discharge (ESD)-protected, high-speed transceivers for RS-422 communication that contain one driver and one receiver. The UM491 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 UM488/UM491 offers higher driver output slew-rate limits, allowing transmit speeds up to 2.5Mbps. 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 375µA 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 UM488/UM491 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 Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission 1nA Low-Current Shutdown Mode (UM491) 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 UM488 full 2.5 Yes No No 375 256 8 UM491 full 2.5 Yes Yes Yes 375 256 14 Ordering Information Part Number Temperature Range Packaging Type Shipping Qty UM488EESA -40°C to +85°C SOP8 2500pcs/13 Inch Tape & Reel UM488EEPA -40°C to +85°C DIP8 50pcs/Tube UM491EESE -40°C to +85°C SOP14 2500pcs/13 Inch Tape & Reel UM491EEPE -40°C to +85°C DIP14 25pcs/Tube ________________________________________________________________________ http://www.union-ic.com Rev.05 Dec.2014 1/17 UM488/UM491 Pin Configurations Top View 14 VCC 13 NC 3 12 A DE 4 11 B DI 5 10 Z 9 Y 8 NC NC 1 RO 2 RE GND 6 R D 7 GND VCC 1 RO 2 DI 3 8 A 7 B 6 Z 5 Y R XX: Week Code UM491EESE SOP14 XX: Week Code UM491EEPE DIP14 UM488 EESA XX UM488 EEPA XX XX: Week Code UM488EESA SOP8 XX: Week Code UM488EEPA DIP8 D GND 4 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.05 Dec.2014 2/17 UM488/UM491 DC Electrical Characteristics (VCC = +5V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) Parameter DRIVER Symbol Test Conditions Differential Driver Output (No Load) VOD1 Figure 3 Differential Driver Output VOD2 Figure 3, R = 50Ω Change-in-Magnitude of Differential Output Voltage (Note 2) ΔVOD Figure 3, R = 50Ω 0.2 V Driver Common-Mode Output Voltage VOC Figure 3, R = 50Ω 3.0 V Change-in-Magnitude of Common-Mode Voltage (Note 2) ΔVOC Figure 3, R = 50Ω 0.2 V Input High Voltage VIH DE, DI, R E Input Low Voltage VIL DE, DI, R E DI Input Hysteresis VHYS Input Current (A and B) IIN Output Leakage (Y and Z) IO ______ VOD1 Typ Max Unit 5 V V 2.0 2.0 V ______ 0.8 DE = GND, VCC = GND or 5.25V DE = GND, VCC = GND or 5.25V V mV 100 VIN = 12V 125 VIN = -7V -75 VIN = 12V 125 µA µA VIN = -7V -7V≤VOUT≤VCC Driver Short-Circuit Output Current (Note 3) Min -100 -250 0V≤VOUT≤12V 0V≤VOUT≤VCC 250 mA ±25 ________________________________________________________________________ http://www.union-ic.com Rev.05 Dec.2014 3/17 UM488/UM491 DC Electrical Characteristics (Continued) (VCC = +5V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) Parameter Symbol Test Conditions Min Typ Max Unit -7V≤VCM≤12V -200 -125 -50 mV RECEIVER 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 Receiver Output Short Circuit Current IOSR 0V≤VRO ≤VCC ±7 25 mV VCC-1.5 V kΩ ±95 mA SUPPLY CURRENT DE = VCC 430 900 DE = GND 375 600 DE = GND, V RE = VCC 0.001 10 Human Body Model ±15 No load, Supply Current Supply Current in Shutdown Mode ESD Protection for Y, Z, A, B ICC ISHDN _______ R E = DI = GND or VCC µA 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.05 Dec.2014 4/17 UM488/UM491 Switching Characteristics (VCC = +5V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V 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 5 10 ns 15 25 ns 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 90 150 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 20 50 ns Receiver Enable to Output High tRZH Figures 4 and 10, CL = 100pF, S2 closed 20 50 ns Receiver Disable Time from Low tRLZ Figures 4 and 10, CL = 100pF, S1 closed 20 50 ns Receiver Disable Time from High tRHZ Figures 4 and 10, CL = 100pF, S2 closed 20 50 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 40 100 ns Driver Enable from Shutdown to Output Low tDZL(SHDN) Figures 6 and 8, CL = 15pF, S1 closed 40 100 ns Receiver Enable from Shutdown- to-Output High tRZH(SHDN) Figures 4 and 10, CL = 100pF, S2 closed 300 1000 ns Receiver Enable from Shutdown- to-Output Low tRZL(SHDN) Figures 4 and 10, CL = 100pF, S1 closed 300 1000 ns 5 2.5 20 50 Mbps 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.05 Dec.2014 5/17 UM488/UM491 Typical Operating Characteristics (VCC = +5V, TA = +25°C, unless otherwise noted.) No Load Supply Current vs. Temperature Output Current vs. Receiver Output High Voltage 400 70 No Load Supply Current(uA) 375 60 Output Current (μA) 350 325 300 275 250 50 40 30 20 RE=L,DE=H 10 225 200 0 -60 -40 -20 0 20 40 60 80 100 0 1 3 4 5 6 Output High Voltage (V) Temperature(℃) Receiver Output High Voltage vs. Temperature Output Current vs. Receiver Output Low Voltage 70 Receiver Output High Voltage(V) 5 60 Output Current (μA) 2 50 40 30 20 10 0 4.9 IRO=8mA 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4 0 1 2 3 4 Output Low Voltage (V) 5 6 -60 -40 -20 0 20 40 60 80 Temperature(℃) ________________________________________________________________________ http://www.union-ic.com Rev.05 Dec.2014 6/17 100 UM488/UM491 Typical Operating Characteristics (Continued) (VCC = +5V, TA = +25°C, unless otherwise noted.) Driver Differential Output Voltage vs. Temperature Receiver Output Low Voltage vs. Temperature 3 IRO=8mA RT=54ohm 2.9 0.35 2.8 Output Voltage(V) Receiver Output Low Voltage(V) 0.4 0.3 0.25 0.2 2.7 2.6 2.5 2.4 2.3 2.2 0.15 2.1 0.1 2 -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 1 2 3 4 5 6 Differential Output Voltage (V) ________________________________________________________________________ http://www.union-ic.com Rev.05 Dec.2014 7/17 100 UM488/UM491 Pin Description Pin Number Symbol Function UM488 UM491 NC - 1 Not Connected RO 2 2 Receiver Output. When R E is low and if A - B ≥-50mV, RO will be high; if A - B ≤ -200mV, RO will be low. ________ ______ RE - 3 DE - 4 DI 3 5 GND 4 6 Receiver Output Enable. Drive RE low to enable RO; RO is ______ ______ 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. ______ 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 GND 4 7 Ground NC - 8 Not Connected Y 5 9 Non-inverting Driver Output Z 6 10 Inverting Driver Output B 7 11 Inverting Receiver Input A 8 12 Non-inverting Receiver Input NC - 13 VCC 1 14 Not Connected Positive Supply 4.75V ≤ VCC≤ 5.25V _______ 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.05 Dec.2014 8/17 UM488/UM491 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: UM491 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.05 Dec.2014 9/17 UM488/UM491 Detailed Description The UM488/UM491 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 UM488/UM491 offer higher driver output slew-rate limits, allowing transmit speeds up to 2.5Mbps. The UM488/UM491 is full-duplex transceiver. It operates from a single +5V 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 UM488/UM491 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 UM488/UM491 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 UM488/UM491, 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 UM488/UM491 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.05 Dec.2014 10/17 UM488/UM491 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 Figure 6. Driver Enable and Disable Timing Test Load 5V 5V DI 1.5V tDPLH 0V Z DE 0V tDPHL Y,Z VOL 1/2VO VO Y 1.5V 1.5V 1.5V tDZL(SHDN), tDZL 2.3V 1/2VO VOL+0.5V Output Normally High Y,Z VDIFF=V(Y)-V(Z) VO VDIFF 0 －VO tDLZ Output Normally Low 90％ 10％ tDR 90％ tSKEW=tDPLH-tDPHL VOH-0.5V 2.3V 0 10％ tDZH(SHDN), tDZH tDHZ tDF Figure 7. Driver Propagation Delays Figure 8. Driver Enable and Disable Times 5V 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.05 Dec.2014 11/17 UM488/UM491 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 UM491 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 UM488/UM491 is slew-rate limited, minimizing EMI and reducing reflections caused by improperly terminated cables. It’s 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 (UM491) _____ 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.05 Dec.2014 12/17 UM488/UM491 Package Information UM488EESA 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 UM488 EESA XX ________________________________________________________________________ http://www.union-ic.com Rev.05 Dec.2014 13/17 UM488/UM491 UM488EEPA 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 UM488 EEPA XX ________________________________________________________________________ http://www.union-ic.com Rev.05 Dec.2014 14/17 UM488/UM491 UM491EESE 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 UM491EESE XX ________________________________________________________________________ http://www.union-ic.com Rev.05 Dec.2014 15/17 UM488/UM491 UM491EEPE 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 UM491EEPE XX ________________________________________________________________________ http://www.union-ic.com Rev.05 Dec.2014 16/17 UM488/UM491 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.05 Dec.2014 17/17