SP1485ECN-L | DigiCamel IC Datasheet

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SP1481E EXAR | Alldatasheet

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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E-485E_00_06609 ■ +5V Only ■ Low Power BiCMOS ■ Driver/Receiver Enable for Multi-Drop configurations ■ Low Power Shutdown Mode (SP48E) ■ Enhanced ESD Specifications:

description

The SP1481E and the SP1485E are a family of half-duplex transceivers that meet the specifications of RS-485 and RS-422 serial protocols with enhanced ESD performance. The ESD tolerance has been improved on these devices to over +15KV 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 versions, the SP1481E and the SP1485E feature Exar's BiCMOS design allowing low power operation without sacrificing performance. The SP1481E and SP1485E meet the requirements of the RS-485 and RS-422 protocols up to 20Mbps under load. The SP1481E is equipped with a low power Shutdown mode. +15KV Human Body Model +15KV IEC1000-4-2 Air Discharge +8KV IEC1000-4-2 Contact Discharge R 8 RO RE DE DI VCC B A GND Now Available in Lead Free Packaging SP1481E/SP1485E Enhanced Low Power Half-Duplex RS-485 Transceivers

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E-485E_00_06609 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 = 5V ± 5% unless otherwise noted. pArAMeters Min. tYp . MAX. Units conditions sp1481e/sp1485e driver dc characteristics Differential Output Voltage 3.5 V CC Volts Unloaded; R = ∞; see Figure 1 Differential Output Voltage 2 V CC Volts with load; R = 50Ω; (RS-422); see Figure 1 Differential Output Voltage 1.5 V CC 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 Driver Common-Mode Output Voltage 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 ±10 μA Applies to DE, DI, RE Driver Short-Circuit Current VOUT = HIGH ±250 mA -7V ≤ VO ≤ +12V VOUT = LOW ±250 mA -7V ≤ VO ≤ +12V sp1481e/sp1485e driver Ac characteristics Maximum Data Rate 20 Mbps RE = 5V, DE = 5V; R DIFF = 54Ω, CL1 = CL2 = 00pF Driver Input to Output 20 30 ns t PLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; see Figures 3 and 5 Driver Input to Output 20 40 ns t PLH; RDIFF = 54Ω, CLI = CL2 = 100pF; (SP1485EMN ONLY) See Figures 3 and 5 Driver Input to Output 20 30 ns t PHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; see Figures 3 and 5 Driver Input to Output 20 40 ns t PHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; (SP1485EMN ONLY) see Figures 3 and 5 Driver Skew 3 5 ns see Figures 3 and 5, tSKEW = | tPLH - tPHL | Driver Rise or Fall Time 8 20 ns From 10% to 90%; R DIFF = 54Ω, CL1 = CL2 = 100pF; see Figures 3 & 6 Driver Enable to Output High 40 70 ns C L = 100pF; see Figures 4 & 6; S2 closed Driver Enable to Output Low 40 70 ns C L = 100pF; see Figures 4 & 6; S closed Driver Disable Time from Low 40 70 ns C L = 100pF; see Figures 4 & 6; S closed Driver Disable Time from High 40 70 ns C L = 100pF; see Figures 4 & 6; S2 closed Output Voltages Power Dissipation per Package

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E-485E_00_06609 speciFicAtions (continued) pArAMeters Min. tYp . MAX. Units conditions sp1481e/sp1485e receiver dc characteristics Differential Input Threshold -0.2 +0.2 Volts -7V ≤ VCM ≤ +12V Differential Input Threshold -0.4 +0.4 Volts -7V ≤ VCM ≤ +12V (SP1485EMN ONLY) Input Hysteresis 20 mV V CM = 0V Output Voltage High 3.5 Volts I O = -4mA, VID = +200mV Output Voltage Low 0.4 Volts I O = +4mA, VID = -200mV Three-State (High Impedance) Output Current ±1 µA 0.4V ≤ V O ≤ 2.4V; RE = 5V Input Resistance 12 15 kΩ -7V ≤ VCM ≤ +12V Input Current (A, B); VIN = 12V +1.0 mA DE = 0V, V CC = 0V or 5.25V, VIN = 12V Input Current (A, B); VIN = -7V -0.8 mA DE = 0V, V CC = 0V or 5.25V, VIN = -7V Short-Circuit Current 7 95 mA 0V ≤ V O ≤ VCC sp1481e/sp1485e receiver Ac characteristics Maximum Data Rate 20 Mbps RE = 0V, DE = 0V Receiver Input to Output 25 70 ns t PLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 7 Receiver Input to Output 25 70 ns t PHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 7 Diff. Receiver Skew ItPLH-tPHLI 5 10 ns R DIFF = 54Ω; CL1 = CL2 = 100pF; Figures 3 & 7 Receiver Enable to Output Low 45 70 ns C RL = 15pF; Figures 2 & 8; S closed Receiver Enable to Output High 45 70 ns C RL = 15pF; Figures 2 & 8; S2 closed Receiver Disable from Low 45 70 ns C RL = 15pF; Figures 2 & 8; S closed Receiver Disable from High 45 70 ns C RL = 15pF; Figures 2 & 8; S2 closed sp1481e shutdown timing Time to Shutdown 50 200 600 ns RE = 5V, DE = 0V Driver Enable from Shutdown to Output High 40 100 ns C L = 100pF; See Figures 4 & 6; S2 closed Driver Enable from Shutdown to Output Low 40 100 ns C L = 100pF; See Figures 4 & 6; S closed Receiver Enable from Shutdown to Output High 300 1000 ns C L = 15pF; See Figures 2 & 8; S2 closed Receiver Enable from Shutdown to Output Low 300 1000 ns C L = 15pF; See Figures 2 & 8; S closed poWer reQUireMents Supply Voltage +4.75 +5.25 Volts Supply Current SP1481E/1485E No Load 900 μA RE, DI = 0V or V CC; DE = VCC 600 μA RE = 0V, DI = 0V or 5V; DE = 0V SP48E Shutdown Mode 10 μA DE = 0V, RE=V CC environMentAL And MecHAnicAL Operating Temperature Commercial (_C_) 0 +70 °C Industrial (_E_) -40 +85 °C (_M_) -40 +125 °C Storage Temperature -65 +150 °C Package NSOIC (_N) TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted

Pin 1 – RO – Receiver Output. Pin 2 – RE – Receiver Output Enable Active LOW. Pin 3 – DE – Driver Output Enable Active HIGH. Pin 5 – GND – Ground Connection. Pin 6 – A – Driver Output/Receiver Input Non-inverting. Pin 7 – B – Driver Output/Receiver Input Inverting.

8 VCC

5 GND

Figure 5. Driver Propagation Delays Figure 1. RS-485 Driver DC Test Load Circuit Figure 3. RS-485 Driver/Receiver Timing Test Circuit Figure 2. Receiver Timing Test Load Circuit Figure 4. RS-485 Driver Timing Test Load #2 Circuit

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E-485E_00_06609 A logic LOW on RE (pin 2) will enable the receiver, a logic HIGH on RE (pin 2) will dis- able the receiver. The receiver for the SP1481E and SP1485E will operate up to at least 20Mbps. 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 sp1481e The SP1481E is equipped with a Shutdown mode. To enable the Shutdown state, both the driver and receiver must be disabled simultaneously. A logic LOW on DE (pin 3) and a logic HIGH on RE (pin 2) will put the SP1481E into Shut- down mode. In Shutdown, supply current will drop to typically 1μA. esd toLerAnce The SP1481E Family incorporates rug- gedized 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 nor latch-up. There are different methods of ESD testing applied: a) MIL-STD-883, Method 3015.7 b) IEC1000-4-2 Air-Discharge c) IEC1000-4-2 Direct Contact The Human Body Model has been the generally accepted ESD testing method for semiconductors. This method is also specified in MIL-STD-883, Method 3015.7 for ESD testing. The premise of this ESD test is to simulate the human body’s potential to store electro-static energy and discharge it to an integrated circuit. The simulation is performed by using a test model as shown in Figure 7. This method will test the IC’s capability to withstand an ESD transient dur- ing normal handling such as in manufactur- ing areas where the ICs tend to be handled frequently. The SP1481E and SP1485E are half-duplex differential transceivers that meet the require- ments of RS-485 and RS-422. Fabricated with a Exar proprietary BiCMOS process, these products require 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 SP1481E and SP1485E 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 SP1481E, and SP1485E 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 DE (pin 3) will tri-state the driver outputs. The transmitters of the SP1481E and SP1485E will operate up to at least 20Mbps. receivers The SP1481E and SP1485E 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 SP1481E and SP1485E have a tri-state enable control pin.

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. test receives a duration of voltage. to the test point when SW2 is switched on. the current charge onto the test point. Figure 9. ESD Test Waveform for IEC1000-4-2

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E-485E_00_06609

orderinG inForMAtion

Model temperature range package Notice EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reli- ability. 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 2009 EXAR Corporation Datasheet June 2009 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. DATE REVISION DESCRIPTION 03/08/07 J Legacy Sipex Datasheet 06/16/09 .0.0 Convert to Exar format, update ordering information and change revision to 1.0.0

Product Information

SP1485ECN-L specifications and overview.

Summary

Enhanced Low Power Half-Duplex RS-485 Transceivers

Description

Enhanced Low Power Half-Duplex RS-485 Transceivers

Source title SP1485ECN-L Datasheet(PDF) - Exar Corporation

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