SP481E EXAR | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 12
Technical content
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808
DESCRIPTION
- +5V Only
- Low Power BiCMOS
- Driver / Receiver Enable for Multi-Drop configurations
- Low Power Shutdown mode (SP481E)
- Enhanced ESD Specifications: +/-5kV Human Body Model +/-15kV IEC1000-4-2 Air Discharge +/-8kV IEC1000-4-2 Contact Discharge
- Available in RoHS Compliant, Lead Free Packaging. SP481E / SP485E Enhanced Low Power Half-Duplex RS-485 Transceivers The SP481E and SP485E are a family of half-duplex transceivers that meet the specifica - tions of RS-485 and RS-422 serial protocols with enhanced ESD performance. The ESD tolerance has been improved on these devices to over +5kV for both Human Body Model and IEC1000-4-2 Air Discharge Method. These devices are pin-to-pin compatible with Exar's SP481 and SP485 devices as well as popular industry standards. As with the original ver - sions, the SP481E and SP485E feature Exar's BiCMOS design allowing low power opera- tion without sacrificing performance. The SP481E and SP485E meet the requirements of the RS-485 and RS-422 protocols up to 10Mbps under load. The SP481E is equipped with a low power shutdown mode.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Input Voltages
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP481E/SP485E DRIVER DC Characteristics Differential Output Voltage GND Vcc Volts Unloaded; R = ∞ ; see Figure 1 Differential Output Voltage 2 Vcc Volts With Load; R = 50Ω (RS-422); see Figure 1 Differential Output Voltage .5 Vcc Volts With Load; R = 27Ω (RS-485); see Figure 1 Change in Magnitude of Driver Differential Output Voltage for Complimentary states
0.2 Volts R = 27Ω or R = 50Ω; see Figure 1
3 Volts R = 27Ω or R = 50Ω; see Figure 1
Input High Voltage 2.0 Volts Applies to DE, DI, RE Input Low Voltage 0.8 Volts Applies to DE, DI, RE Input Current +/-0 µA Applies to DE, DI, RE Driver Short Circuit Current VOUT = HIGH +/-250 mA -7V ≤ VO ≤ +12V VOUT = LOW +/-250 mA -7V ≤ VO ≤ +12V SP481E/SP485E DRIVER AC Characteristics Max. Transmission Rate 0 Mbps RE = 5V, DE = 5V; RDIFF = 54Ω, CL = CL2 = 00pF Driver Input to Output, tPLH 20 30 60 ns See Figures 3 & 5, RDIFF = 54Ω, CL = CL2 = 00pFDriver Input to Output, tPLH (SP485EMN ONLY) 20 30 80 ns Driver Input to Output, tPHL 20 30 60 ns See Figures 3 & 5, RDIFF = 54Ω, CL = CL2 = 00pFDriver Input to Output, tPHL (SP485EMN ONLY) 20 30 80 ns Driver Skew 5 0 ns see Figures 3 and 5, tSKEW = |tDPHL - tDPLH| Driver Rise or Fall Time 3 5 40 ns From 0%-90%; RDIFF = 54Ω CL = CL2 = 100pF; see Figures 3 and 6 Output Voltages Power Dissipation (derate 6.60mW/ºC above +70ºC) (derate .8mW/ºC above +70ºC)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP481E/SP485E DRIVER (continued) AC Characteristics Driver Enable to Output High 40 70 ns CL = 100pF, see Figures 4 and 6, S2 closed Driver Enable to Output Low 40 70 ns CL = 100pF, see Figures 4 and 6, S closed Driver Disable Time from High 40 70 ns CL = 100pF, see Figures 4 and 6, S2 closed Driver Disable Time from Low 40 70 ns CL = 100pF, see Figures 4 and 6, S closed SP481E/SP485E RECEIVER DC Characteristics Differential Input Threshold -0.2 +0.2 Volts -7V ≤ VCM ≤ +12V Differential Input Threshold (SP485EMN ONLY) -0.4 +0.4 Volts -7V ≤ VCM ≤ +12V Input Hysteresis 20 mV VCM = 0V Output Voltage High 3.5 Volts IO = -4mA, VID = +200mV Output Voltage Low 0.4 Volts IO = +4mA, VID = +200mV Three-State ( High Impedance) Output Current +/- µA 0.4V ≤ VO ≤ 2.4V; RE = 5V Input Resistance 2 5 kΩ -7V ≤ VCM ≤ +12V Input Current (A, B); VIN = 2V +.0 mA DE = 0V, VCC = 0V or 5.25V, VIN = 2V Input Current (A, B); VIN = -7V -0.8 mA DE = 0V, VCC = 0V or 5.25V, VIN = -7V Short Circuit Current 7 95 mA 0V ≤ VO ≤ VCC SP481E/SP485E RECEIVER AC Characteristics Max. Transmission Rate 0 Mbps RE = 0V, DE = 0V Receiver Input to Output 20 45 00 ns tPLH ; See Figures 3 & 7, RDIFF = 54Ω, CL = CL2 = 00pF Receiver Input to Output 20 45 00 ns tPHL ; See Figures 3 & 7, RDIFF = 54Ω, CL = CL2 = 00pF Differential Receiver Skew |tPHL - tPLH| 3 ns RDIFF = 54Ω, CL = CL2 = 100pF, see Figures 3 and 7 Receiver Enable to Output Low 45 70 ns CRL = 15pF, Figures 2 & 8; S Closed Receiver Enable to Output High 45 70 ns CRL = 15pF, Figures 2 & 8; S2 Closed Receiver Disable from LOW 45 70 ns CRL = 15pF, Figures 2 & 8; S Closed Receiver Disable from High 45 70 ns CRL = 15pF, Figures 2 & 8; S2 Closed TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP481E Shutdown Timing Time to Shutdown 50 200 600 ns RE = 5V, DE = 0V Driver Enable from Shutdown to Output High 40 00 ns CL = 100pF; See Figures 4 and 6; S2 Closed Driver Enable from Shutdown to Output Low 40 00 ns CL = 100pF; See Figures 4 and 6; S Closed Receiver Enable from Shutdown to Output High 300 000 ns CL = 15pF; See Figures 2 and 8; S2 Closed Receiver Enable from Shutdown to Output Low 300 000 ns CL = 15pF; See Figures 2 and 8; S Closed POWER REQUIREMENTS Supply Voltage VCC +4.75 +5.25 Volts Supply Current SP481E/SP485E No Load 900 µA RE, DI = 0V or VCC; DE = VCC 600 µA RE = 0V, DI = 0V or 5V; DE = 0V SP481E Shutdown Mode 0 µA DE = 0V, RE = VCC ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) 0 70 ºC Industrial (_E_) -40 +85 ºC (_M_) -40 +25 ºC Storage Temperature -65 +50 ºC Package Plastic DIP (_P) NSOIC (_N) TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted.
Figure 6. Driver Enable and Disable Times Figure 8. Receiver Enable and Disable Times Table 1. Transmit Function Truth Table
0 X Z
Table 2. Receive Function Truth Table Figure 7. Receiver Propagation Delays
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 The SP481E and SP485E are half-duplex differential transceivers that meet the require- ments of RS-485 and RS-422. Fabricated with an Exar proprietary BiCMOS process, this product requires a fraction of the power of older bipolar designs. The RS-485 standard is ideal for multi-drop applications and for long-distance interfaces. RS-485 allows up to 32 drivers and 32 receiv- ers to be connected to a data bus, making it an ideal choice for multi-drop applications. Since the cabling can be as long as 4,000 feet, RS-485 transceivers are equipped with a wide (-7V to +12V) common mode range to accommodate ground potential differ - ences. Because RS-485 is a differential interface, data is virtually immune to noise in the transmission line. Drivers The driver outputs of the SP481E and SP485E are differential outputs meeting the RS-485 and RS-422 standards. The typical voltage output swing with no load will be 0 Volts to +5 Volts. With worst case loading of 54Ω across the differential outputs, the drivers can maintain greater than 1.5V volt- age levels. The drivers of the SP481E and SP485E have an enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differential driver outputs. A logic LOW on the DE(pin 3) will tri-state the driver outputs. The transmitters of the SP481E and SP485E will operate up to at least 10Mbps. Receivers The SP481E and SP485E receivers have differential inputs with an input sensitivity as low as ±200mV. Input impedance of the receivers is typically 15kΩ (12kΩ minimum). A wide common mode range of -7V to +12V allows for large ground potential differences between systems. The receivers of the SP481E and SP485E have a tri-state en - able control pin. A logic LOW on RE (pin 2) will enable the receiver, a logic HIGH on RE (pin 2) will disable the receiver. The receiver for the SP481E and SP485E will operate up to at least 10Mbps. The receiver for each of the two devices is equipped with the fail-safe feature. Fail- safe guarantees that the receiver output will be in a HIGH state when the input is left unconnected. Shutdown Mode SP481E The SP481E is equipped with a Shutdown mode. TO enable the shutdown state, both driver and receiver must be disabled simul- taneously. A logic LOW on DE (pin 3) and a Logic HIGH on RE (pin 2) will put the SP481E into Shutdown mode. In Shutdown, supply current will drop to typically µA. ESD TOLERANCE The SP481E and SP485E incorporates ruggedized ESD cells on all driver output and receiver input pins. The ESD structure is improved over our previous family for more rugged applications and environments sensitive to electro-static discharges and associated transients. The improved ESD tolerance is at least ±15kV without damage or latch-up. There are different methods of ESD testing applied: a) MIL-STD-883, Method 305.7 b) IEC1000-4-2 Air-Discharge c) IEC000-4-2 Direct Contact
before he or she even touches the system. will tend to change the discharge current. current varies with the approach speed. the PCB and finally to the IC. Figure 11. ESD Test Waveform for IEC1000-4-2 resistor, onto the device under test (DUT). to the test point when SW2 is switched on. the current charge onto the test point.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808
ORDERING INFORMATION
Model Temperature Range Package Types
REVISION HISTORY
May /07 -- Legacy Sipex Datasheet 2/8/08 .0.0 Convert to Exar Format. Update ordering information as a result of discontinued Lead type package options per PDN 081126-01. Remove "Top Mark" information from ordering page. Notice EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliabil- ity. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writting, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Copyright 2008 EXAR Corporation Datasheet December 2008 Send your Interface technical inquiry with technical details to: uarttechsupport@exar.com Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. Note: /TR = Tape and Reel