UM3483E UNIONSEMI | Alldatasheet
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ESD Protection for RS-485 I/O Pins ±15kV—Human Body Model ±15kV—IEC 1000-4-2, Air-Gap Discharge Operate from a Single 3.3V supply Interoperable with +5V Logic Slew-Rate Limited for Errorless Data Transmission 1 μA Low-Current Shutdown Mode –7V to +12V Common-Mode Input V oltage Range Allows up to 256 Transceivers on the Bus Thermal Shutdown Current-Limiting for Driver Overload Protection
Ordering Information
UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005 Page 1 of 12 PART TEMP. RANGE PIN-PACKAGE UM3483EESA -40°C to +85°C 8 SO UM3483EEPA -40°C to +85°C 8 Plastic DIP UM3486EESA -40°C to +85°C 8 SO UM3486EEPA -40°C to +85°C 8 Plastic DIP
Union Semiconductor, Inc. http://www.union-ic.com Selector Guide Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the s pecifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. (VCC = 3.3V ±0.3V , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C) UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005 Page 2 of 12 PART NUMBER GUARANTEED DATA RATE (Mbps) SUPPLY VOLTAGE (V) SLEW-RATE LIMITED DRIVER/ RECEIVER ENABLE SHUTDOWN CURRENT (µA) ±15kV ESD PROTECTION PIN COUNT UM3483E 0.5 Yes Yes 1 Yes 8 UM3486E 2.5 3.0 to 3.6 Yes Yes 1 Yes 8 Continuous Power Dissipation (TA = +70°C) 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)..727mW 8-Pin SO (derate 5.88mW/°C above +70°)………….471mW Operating Temperature Ranges PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS RL = 54ȍ ҏ(RS-485), Figure 2 1.2 Differential Driver Output V OD RL = 60ȍ ҏ(RS-485), VCC = 3.3V, Figure3 1.2 V Change in Magnitude of Driver Differential Output Voltage for Complementary Outpu t States (Note 1) ¨VOD RL = 54ȍҏor 100ȍ, Figure 2 0.2 V Driver Common-Mode Output Voltage V OC R L = 54ȍҏor 100ȍ, Figure 2 2 V Change in Magnitude of Common-Mode Output Voltage (Note 1) ¨VOC RL = 54ȍor 100ȍ, Figure 2 0.2 V Input High Voltage V IH DE, DI, /RE 2.0 V Input Low Voltage V IL DE, DI, /RE 0.8 V Logic Input Current I IN1 DE, DI, /RE f2 μA VIN = 1 2 V 1 . 0 Input Current (A, B) I IN2 DE = 0V, VCC = 0V or 3.6V VIN = - 7 V - 0 . 8 mA Receiver Differential Threshold Voltage VTH -7V İVCMİ1 2 V - 0 . 2 - 0 . 0 5 V Receiver Input Hysteresis ¨VTH V CM = 0V 20 mV Receiver Output High Voltage V OH I OUT = -1.5mA, VID = 200mV, Figure 4 V CC - 0.4 V Receiver Output Low Voltage V OL I OUT = 2.5mA, VID = 200mV, Figure 4 0.4 V Three-State (High Impedance) Output Current at Receiver IOZR V CC = 3.6V, 0VİVOUTİVCC f1 μA Receiver Input Resistance R IN -7V İVCMİ12V 96 k ȍ Supply Voltage Range V CC 3 . 0 3 . 6 V DE = VCC, /RE = 0V or VCC 0.6 1.2 Supply Current I CC No load, DI = 0V or VCC DE = 0V, /RE = 0V 0.5 1.0 mA Supply Current in Shutdown Mode I SHDN DE = 0V, /RE = V CC, DI = VCC or 0V 1.0 μA VOUT = -7V -250 Driver Short-Circuit Output Current I OSD VOUT = 12V 250 mA Receiver Short-Circuit Output Current I OSR 0V İVROİVCC f8 f60 mA Human Body Model ±15ESD Protection for A, B IEC 1000-4-2 Air Discharge ±15 kV
Union Semiconductor, Inc. http://www.union-ic.com Receiver Switching Characteristics—UM3483E (VCC = 3.3V , TA = +25°C) Receiver Switching Characteristics—UM3486E (VCC = 3.3V , TA = +25°C) UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005 Page 3 of 12 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Maximum Data Rate 2.5 Mbps Driver Differential Output Delay tDD RL = 60ȍ, Figure 5 20 42 70 ns Driver Differential Output Transition Time tTD RL = 60ȍ, Figure 5 15 28 60 ns Driver Propagation Delay, Low-to-High Level tPLH RL = 27ȍ, Figure 6 20 42 75 ns Driver Propagation Delay, High-to-Low Level tPHL RL = 27ȍ, Figure 6 20 42 75 ns |tPLH - tPHL| Driver Propagation Delay Skew (Note 2) tPDS RL = 27ȍ, Figure 6 -6 f12 ns DRIVER-OUTPUT ENABLE/DISABLE TIMES Driver Output Enable Time to Low Level tPZL RL = 110ȍ, Figure 18 52 100 ns Driver Output Enable Time to High Level tPZH RL = 110ȍ, Figure 7 52 100 ns Driver Output Disable Time from High Level tPHZ RL = 110ȍ, Figure 7 40 80 ns Driver Output Disable Time from Low Level tPLZ RL = 110ȍ, F i g u r e 8 4 0 8 0 n s Driver Output Enable Time from Shutdown to Low Level tPSL RL = 110ȍ, Figure 8 700 1000 ns Driver Output Enable Time from Shutdown to High Level tPSH RL = 110ȍ, Figure 7 700 1000 ns PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Maximum Data Rate 0.5 Mbps Driver Differential Output Delay tDD RL = 60ȍ, Figure 5 600 900 1400 ns Driver Differential Output Transition Time tTD RL = 60ȍ, Figure 5 400 740 1200 ns Driver Propagation Delay, Low-to-High Level tPLH RL = 27ȍ, Figure 6 700 930 1500 ns Driver Propagation Delay, High-to-Low Level tPHL RL = 27ȍ, Figure 6 700 930 1500 ns |tPLH - tPHL| Driver Propagation Delay Skew (Note 2) tPDS RL = 27ȍ, Figure 6 f50 ns DRIVER-OUTPUT ENABLE/DISABLE TIMES Driver Output Enable Time to Low Level tPZL RL = 110ȍ, Figure 8 900 1300 ns Driver Output Enable Time to High Level tPZH RL = 110ȍ, Figure 7 600 800 ns Driver Output Disable Time from High Level tPHZ RL = 110ȍ, Figure 7 50 80 ns Driver Output Disable Time from Low Level tPLZ RL = 110ȍ, Figure 8 50 80 ns Driver Output Enable Time from Shutdown to Low Level tPSL RL = 110ȍ, Figure 8 1.9 2.7 μs Driver Output Enable Time from Shutdown to High Level tPSH RL = 110ȍ, Figure 7 2.2 3.0 μs
Union Semiconductor, Inc. http://www.union-ic.com Receiver Switching Characteristics (VCC = +3.3V , TA = +25°C.) Typical Operating Characteristics (VCC = 3.3V , TA = +25°C, unless otherwise noted.) UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005 Page 4 of 12 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Time to Shutdown t SHDN UM3483E /UM3486E (Note 3) 80 190 300 ns VID = 0 to 3.0V, CL = 1 5 p F , F i g u r e 9 2 5 6 2 9 0Receiver Propagation Delay, Low-to-High Level tRPLH U M 3 4 8 3 E 2 5 7 5 1 2 0 ns VID = 0 to 3.0V, CL = 1 5 p F , F i g u r e 9 2 5 6 2 9 0Receiver Propagation Delay, High-to-Low Level tRPHL U M 3 4 8 3 E 2 5 7 5 1 2 0 ns VID = 0 to 3.0V, CL = 1 5 p F , F i g u r e 9 6 ± 1 0 |tPLH - tPHL| Receiver Propagation-Delay Skew tRPDS UM3483E 12 ±20 ns Receiver-Output Enable Time to Low Level tPRZL CL = 15pF, Figure 10, UM3483E /UM3486E 2 5 5 0 n s Receiver-Output Enable Time to High Level tPRZH CL = 15pF, Figure 10, UM3483E /UM3486E 2 5 5 0 n s Receiver-Output Disable Time from High Level tPRHZ CL = 15pF, Figure 10, UM3483E /UM3486E 2 5 4 5 n s Receiver-Output Disable Time from Low Level tPRLZ CL = 15pF, Figure 10, UM3483E /UM3486E 2 5 4 5 n s Receiver-Output Enable Time from Shutdown to Low Level tPRSL CL = 15pF, Figure 12, UM3483E /UM3486E 720 1400 ns Receiver-Output Enable Time from Shutdown to High Level tPRSH CL = 15pF, Figure 10, UM3483E /UM3486E 720 1400 ns Note 1: ¨VOD and ¨VOC are the changes in VOD and VOC, respectively, when the DI input changes state. Note 2: Measured on |tPLH (Y) - tPHL (Y)| and |tPLH (Z) - tPHL (Z)|. Note 3: The transceivers are put into shutdown by bringing /RE high and DE low. If the inputs are in this state for less than 80ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to hav e entered shutdown. See Low-Power Shutdown Mode section.
Union Semiconductor, Inc. http://www.union-ic.com Typical Operating Characteristics (continued) (VCC = 3.3V , TA = +25°C, unless otherwise noted.) UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005 Page 5 of 12
Figure 1. UM3483E /UM3486E Pin Configuration and Typical Operating Circuit Figure 2. Driver VOD and VOC Figure 3. Driver VOD with Varying Common-Mode V oltage Figure 4. Receiver VOH and VOL 1 RO Receiver Output. If A > B by -50mV, RO will be high; if A < B by 200mV, RO will be low. is high and DE is low, the device will enter a low-power shutdown mode. function as line receivers if /RE is low.
5 GND Ground
6 A Noninverting Receiver Input and Noninverting Driver Output
7 B Inverting Receiver Input and Inverting Driver Output
Figure 9. Receiver Propagation Delay Figure 10. Receiver Enable and Disable Times Note 4: The input pulse is supplied by a generator with the following characteristics: PRR = 250kHz, 50% duty cycle, tr=6.0ns, ZO = 50Ù. Note 5: CL includes probe and stray capacitance. Table 1. Transmitting Table 2. Receiving
0 X Inputs Open 1 Normal
Union Semiconductor, Inc. http://www.union-ic.com Driver Output Protection Excessive output current and power dissipation caused by faults or by bus contention are prevented by two mechanisms. A foldback current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see Typical Operating Characteristics). In addition, a thermal shutdown circuit forces the driver outputs into a high-impedance state if the die temperature rises excessively. Propagation Delay Figures 12 and 13 show the typical propagation delays. 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, |tPRLH - tPRHL|, is under 10ns (20ns for the UM3483E). The driver skew times 12ns for the UM3486E, and typically under 50ns for the UM3483E. Line Length vs. Data Rate ±15kV ESD Protection As with all Union devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encoun- tered during handling and assembly. The driver outputs and receiver inputs of the UM3483E family of devices 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 structures withstand high. ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Union’s E versions keep working without latchup or damage. ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits: 1) ±15kV using the Human Body Model 2) ±15kV using IEC 1000-4-2’s Air-Gap method. Human Body Model IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The UM3483E family devices help you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2, without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 16a shows the IEC 1000-4-2 model, and Figure 16b shows the current waveform for the ±8kV IEC 1000-4-2, Level 4 ESD contact-discharge test. The air-gap test involves approaching the device with a charged probe. UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005 Page 10 of 12 The RS-485 standard covers line lengths up to 4000 feet. Figure 13 shows the system differential voltage for parts driving 4000 feet of 26AWG twisted-pair wire at 125kHz into 120ȍ loads. Figure 15a shows the Human Body Model and Figure 15b shows the current waveform it generates when discharged into a low impedance. This model consists of 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5kȍ ҏresistor.
Union Semiconductor, Inc. http://www.union-ic.com
Package Information
UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005 Page 12 of 12