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SP1486E
+5V, 20Mbps PROFIBUS RS485/RS422 Transceivers Advanced Failsafe, 1/8th Unit Load, 15kV ESD-Protected
FEATURES
* Recommended for PROFIBUS applications * High differential output drive, minimum 2.1V into 54 load * 5.0V Single Supply Operation * 1ns driver and receiver skew * 20 Mbps data rate * 1/8th Unit Load, 256 transceivers on bus * Robust ESD Protection for RS485 pins * 15kV Air-Gap Discharge * 15kV Human Body Model * 8kV Contact Discharge * Hot Swap glitch protection on control inputs * Receiver failsafe on open, short or terminated lines * Driver short circuit current limit and thermal shutdown for overload protection * Very low 300A static power consumption * 1A shutdown mode
+5V 100nF 1 2 3 4 RO RE R B VCC B 8 7 RT 6 5
DE D DI
A
GND
SP1486E APPLICATIONS
* High Speed RS485 Communications * Industrial Process Control * PROFIBUS applications
SP1486E is a half duplex differential line transceiver suitable for high speed bidirectional communication on multipoint bus transmission lines. Each device contains one differential driver and one differential receiver. Devices comply with TIA/EIA-485 and TIA/EIA-422 standards and also meet the higher drive and tighter skew requirements of PROFIBUS applications. Lead-free and RoHS compliant packages are available for all models. PROFIBUS is in wide use in industrial control and automation applications and the SP1486E is ruggedized for use in harsh operating conditions. Receivers are specially designed to fail-safe to a logic high output state if the inputs are left un-driven or shorted. All RS485 bus-pins are protected against severe ESD events up to 15kV (Air-Gap and Human Body Model) and up to 8kV Contact Discharge (IEC 1000-4-2). Drivers are protected from excess current flow caused by bus contention or output short-circuits by both an internal current limit and a thermal-overload shutdown. Devices are rated for Industrial (-40 to +85C) operating temperature. Receivers have exceptionally high input impedance, which places only 1/8th the standard load on a shared bus. Up to 256 transceivers may coexist while preserving full signal margin. All devices operate from a single 5.0 V power supply and draw negligible quiescent power. Both driver and receiver can be enabled and disabled independently and the device enters a low power shutdown mode if both driver and receiver are disabled. The bus-pin outputs of disabled modules are in high impedance state. The high impedance driver output is maintained over the entire common-mode voltage range from -7 to +12V.
DESCRIPTION
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1486E_100_061009
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PIN ASSIGNMENTS
Pin Name 1 2 3 4 5 6 7 8 Pin Function RO RE DE DI GND A B Vcc Pin Function Receiver Output. When RE is low and if (A - B) -40mV, RO is High. If (A - B) - 200mV, RO is low. Receiver Output Enable. RO is enabled when RE is low. When RE is high, RO is high impedance. Drive RE high and DE low to enter shutdown mode. RE is a hot-swap input. Driver Output Enable. When DE is high, outputs are enabled. When DE is low, outputs are high impedance. Drive DE low and RE high to enter shutdown mode. DE is a hot-swap input. Driver Input. With DE high, a low level on DI forces non-inverting output low and inverting output high. Similarly, a high level on DI forces non-inverting output high and inverting output low. Ground Non-inverting Receiver Input and Non-inverting Driver Output Inverting Receiver Input and Inverting Driver Output Positive Supply Vcc. Bypass Vcc to GND with a 0.1uF capacitor.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
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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.
Supply Voltage (VCC)....................................................+ 7.0V Input voltage at control input pins (RE, DE) ....... -0.3V to Vcc+0.3V Driver input voltage (DI) .........................-0.3V to Vcc+0.3V Driver output voltage (A, B) .........................................+13V Receiver output voltage (RO) ..............-0.3V to (Vcc + 0.3V) Receiver input voltage (A, B) ......................................+13V Package Power Dissipation....................450mW @ Ta=25C Maximum Junction Temperature................................. 150C 8-Pin SOICN Oja =.............................................128.4C/W Storage Temperature..................................-65C to +150C
ABSoluTE MAxIMuM RATINGS
Vcc=5V 10%, Tmin to Tmax, unless otherwise noted, Typical values are Vcc=5V and Ta=25C
Recommended Operating Conditions Supply Voltage, Vcc Input Voltage on A and B pins High-level input voltage (DI, DE or RE), Vih Low-level input voltage (DI, DE or RE), Vil Output Current Driver Receiver Signaling Rate, Operating Free Air Temperature, Ta Industrial Grade (E) -40 -40 Min. 4.5 -7 2 0 -60 -8 Typ. 5 Max. 5.5 12 Vcc 0.8 60 8 20 85 150
RECoMMENDED oPERATING CoNDITIoNS
Unit V V V V
mA Mbps C C
Junction Temperature, Tj
Note: The least positive (most negative) limit is designated as the maximum value.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
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ElECTRICAl CHARACTERISTICS
PARAMETER Digital Input Signals: DI, DE, RE High, Vih Low, Vil Ta=25C, after first transition Ta=25C 100 2.0 0.8 1 TEST CONDITIONS MIN TYP MAX UNIT
Logic input thresholds Logic Input Current Input Hysteresis Driver Differential Driver Output (VOD) Differential Driver Output Differential Driver Output Change in Magnitude of Differential Output Voltage (VOD) (Note 1) Driver Common Mode Output Voltage (Voc) Change in Common Mode Output Voltage (VOC) Driver Short Circuit Current Limit Receiver Receiver Input Resistance Input Current (A, B pins)
V A mV
No Load Rl=100 (RS422) Rl=54 (RS485) Vcm=-7 to +12V Rl=54 or 100 Rl=54 or 100 Rl=54 or 100 -7VVout+12V 2.1 2.1 2.1 2.7 2.7
Vcc Vcc Vcc Vcc 0.2 3 0.2 250
V
V
V V V mA
-7VVcm12V DE=0, RE=0, Vcc=0 or 5.5V -7VVcm12V Vin=12V Vin=-7V
96 125 -100 -200 -125 25 -40
K
A mV mV V 0.4 1 95 A mA
Receiver Differential Threshold (VA-VB) Receiver Input Hysteresis Receiver Output Voltage Voh Vol
Iout=-8mA, Vid=-40mV Iout=8mA, Vid=-200mV Vcc=5.5V, 0VoutVcc 0VVro Vcc
Vcc-1.5
High-Z Receiver Output Current Receiver Output Short Circuit Current Supply and Protection Supply Current IQ, Active Mode Shutdown Mode
No load, DI=0 or Vcc DE=0, RE=Vcc, DI=Vcc or 0 Junction temperature
0.30
1 1
mA A
o
Thermal Shutdown Temperature Thermal Shutdown Hysteresis
165 15
C
Notes: 1. Change in Magnitude of Differential Output Voltage and Change in Magnitude of Common Mode Output Voltage are the changes in output voltage when DI input changes state. 2. The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns the device does not enter shutdown. If the enable inputs are held in this state for at least 600ns the device is assured to be in shutdown. In this low power mode most circuitry is disabled and supply current is typically 1nA. 3. Characterized, not 100% tested
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
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TIMING CHARACTERISTICS
Unless otherwise noted Vcc= +5.00.5V, ambient temperature Ta from -40 to +85C
DRIVER CHARACTERISTICS: Data Signaling Rate Driver Propagation Delay (tPHL, tPLH) Driver Output Rise/Fall Time (tR, tF) Driver Differential Skew (tPLH - tPHL) Driver Enable to Output High (tZH) Driver Enable to Output Low (tZL) Driver Disable from Output High (tHZ) Driver Disable from Output Low (tLZ) Shutdown to Driver Output Valid (tZV) RL = 500, CL = 50pF, RL = 54, CL = 50pF, Conditions Duty Cycle 40 to 60% Min. Typ. Max. Unit 20 12 6 1 20 10 5 50 50 50 50 150 Mbps ns ns ns ns ns ns ns ns
RECEIVER CHARACTERISTICS: Data Signaling Rate Receiver Propagation Delay (tPLH, tPHL) Propagation Delay Skew (tPLH, tPHL) Receiver Output Rise/Fall Time Receiver Enable to Output High (tZH) Receiver Enable to Output Low (tZL) Receiver Disable from Output High (tHZ) Receiver Disable from Output Low (tLZ) Shutdown to Receiver Output Valid (tROV) Time to Shutdown (Note 2,3)
Conditions Duty Cycle 40 to 60% Cl=15pF, Vid=2V,
Min. Typ. Max. Unit 20 40 1 5 15 50 50 50 50 3500 50 200 600 Mbps ns ns ns ns ns ns ns ns ns
Cl=15pF Cl=15pF, RL=1k Cl=15pF, RL=1k Cl=15pF, RL=1k Cl=15pF, RL=1k
FUNCTION TABLES
Transmitting Inputs RE X X 0 1 DE 1 1 0 0 DI 1 0 X X A 1 0 High-Z Shutdown Outputs B 0 1 RE 0 0 0 1 1
Note: Receiver inputs -200mV < VA - VB < -40mV, should be considered indeterminate
Receiving Inputs DE X X X 1 0 -40mV -200mV Open/shorted X X VA - VB Output RO 1 0 1 High-Z Shutdown
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
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TYPICAl PERFoRMANCE CHARACTERISTICS
60
0.35 IOUT=8mA, V ID=-200mV
50
0.3
Output-Low Voltage (V)
Output Current (mA)
40 40
0.25
30 30
0.2
20 20
Output Low Voltage (V) 0.15
Output Current (mA)
10
0.1 -60 -40 -20 0 20 40 60 80 100 Temperature (C)
0 0 1 2 3 Output Low Voltage (V) 4 5
Output Current vs Receiver Output Low Voltage
35
Receiver Output Low Voltage vs Temperature
4
30 25
IOUT=8mA, V ID=-40mV 3.9
Output Current (mA)
20 20 15 15
Output-Low Voltage (V)
1 2 3 Output High Voltage (V) 4 5
3.8
Output Current (mA) 10 5 0 0
3.7
Output High Voltage (V) 3.6
3.5 -60 -40 -20 0 20 40 60 80 100 Temperature (C)
Output Current vs Receiver Output High Voltage
Receiver Output High Voltage vs Temperature
100
3.4 3.2
Rl=100
Output Current (mA)
10
Output Voltage (V)
3 2.8 2.6 Output Voltage (V) 2.4 2.2
RL
1
Rl=54
Output Current (mA) 0.1
RL
0.01 0 1 2 3 4 5 6 Differential Output Voltage (V)
2 -60 -40 -20 0 20 Temperature (C) 40 60 80 100
Driver Output Current vs Differential Output Voltage
Driver Differential Output Voltage vs Temperature
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
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TYPICAl PERFoRMANCE CHARACTERISTICS
100 90 80
Output Current (mA)
70 60 50 40
Output Current (mA) 30 20 10 0 0 1 2 3 4 5 6 Output Low Voltage (V)
Output Current vs Driver Output Low Voltage
Driver Output Waveforms High to Low
-120
-100
Output Current (mA)
-80
-60
-40 Output Current (mA) -20
0 -2 -1 0 1 2 3 4 5 6 Output High Voltage (V)
Output Current vs Driver Output High Voltage
Driver Output Waveform Low to High
350 325
DE = Vcc
No-Load Supply Current (A)
300 275 250
DE = GND
225 No-Load Supply Current (uA) 200 -60 -40 -20 0 20 40 60 80 100 Temperature (C)
No-load Supply Current vs Temperature Driver and Receiver Hot Swap Performance vs. Vcc
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com SP1486E_100_061009
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DESCRIPTION
R/2 DI VCC D VOD R/2 VOC
A VID B R RE
OUT
Driver DC Test Circuit
Receiver DC Test Circuit
DI
A D B 3.3V VOD
RL 54
CL 50pF
Driver Propagation Delay Time Test Circuit and Timing Diagram
DI
Vcc 0V A B VO 1/2VO
Vcc/2 t PLH t PHL
Vcc/2
1/2VO
VDIFF VA - VB
VO+ 0V VO-
90% 10% tR t SKEW = |t PLH - t PHL |
90% 10% tF
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1486E_100_061009
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DESCRIPTION Driver Differential Output Test Circuit
DE = 3.3V DI = 0 or Vcc A/Y D VOD B/Z 60
375
375
VCM
Driver Enable and Disable Times Test Circuit and Timing Diagram
Y 0 or Vcc DI D Z CL = 50pF S1 OUT RL = 500
GENERATOR
50
DE tZH, tZH(SHDN)
Vcc/2
Vcc 0
OUT
VOM = (VOL + Vcc)/2 t HZ
0.25V 0
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1486E_100_061009
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DESCRIPTION Driver Enable and Disable Times Test Circuit and Timing Diagram
Vcc RL = 500 Y 0 or Vcc DI D Z CL = 50pF S1 OUT
GENERATOR
50
DE
Vcc/2 tDZL, tDZL(SHDN) t DLZ
Vcc 0
Vcc OUT VOL
VOM = (VOL + Vcc)/2
0.25V
Receiver Propagation Delay Test Circuit and Timing Diagram
A VID B R RE
OUT CL 15pF
A B 1.5V t RPLH t RPHL
+1V -1V VOH VOL
SP1486E_100_061009
OUT
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
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DESCRIPTION Receiver Enable and Disable Times Test Circuit
1.5V -1.5V
S3
S1 B A R RE 1k S2 CL= 15pF Vcc
GENERATOR
50
Receiver Enable and DisableTiming Diagram
S1 is open, S2 is closed, S3 = 1.5V 3V 1.5V RE tZH, tZH(SHDN) VOH OUT VOH /2 0V
S1 is closed, S2 is open, S3 = -1.5V 3V
RE
1.5V tZL,tZL(SHDN) 0V VCC
OUT
VOL= VCC /2 VOL
S1 is open, S2 is closed, S3 = 1.5V 3V RE 0.25V OUT 1.5V tHZ VOH 0V
S1 is closed, S2 is open, S3 = -1.5V 3V
RE
1.5V tLZ 0V VCC
OUT
0.25V
VOL
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1486E_100_061009
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DETAILED DESCRIPTION SP1486E is an advanced RS485/RS422 transceiver, ideal for PROFIBUS applications. Each device contains one high speed driver and receiver capable of speeds up to 20Mbps with low skew. The device is designed for reliability in demanding operating conditions. It features a fail-safe circuitry that 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. Control inputs (DE and RE) also feature a hotswap capability allowing live insertion without error data transfer. The device operates from a single 5.0V 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. PROFIBUS (EN50170 or DIN19245) The PROFIBUS standard originated in Europe but has spread worldwide as an industrial fieldbus for use in process automation and factory control. There are a number of different implementations, but one of the most widely used is PROFIBUS-DP (Process Field Bus - Distributed Peripherals). DP uses RS485 as its physical layer along with a proprietary data-link layer. ADVANCED FAIL SAFE Ordinary RS485 differential receivers will be in an indeterminate state whenever A - B is less than 200mV. This situation can occur whenever the data bus is not being actively driven. The Advanced Failsafe feature of the SP1486E guarantees a logic-high receiver output if the receiver's differential inputs are shorted, opencircuit, or if they are shunted by a termination resistor. The receiver thresholds of the SP1486E are very precise and offset by at least a 40mV noise margin from ground. This results in a logic-high receiver output at zero volts input differential while maintaining compliance with the EIA/TIA485 standard of 200mV.
HoT-SWAP CAPABIlITY When a micro-processor or other logic device undergoes its power-up sequence its logicoutputs are typically at high impedance. In this state they are unable to drive the DE and RE signals to a defined logic level. During this period, noise, parasitic coupling or leakage from other devices could cause standard CMOS enable inputs to drift to an incorrect logic level.
DESCRIPTION
If circuit boards are inserted into an energized backplane (commonly called "live insertion" or "hot-swap") power may be suddenly applied to all circuits. Without the hot-swap capability, this situation could improperly enable the transceiver's driver or receiver, driving invalid data onto shared busses and possibly causing driver contention or device damage. The SP1486E contains a special power-onreset circuit that holds DE low and RE high for approximately 10 microseconds. After this initial power-up sequence the hot-swap circuit becomes transparent, allowing for normal, unskewed enable and disable timings. 15KV ESD PROTECTION ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver output and receiver inputs have extra protection against static electricity. Exar uses 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, the SP1486E keeps working without latch-up or damage. ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of the SP1486E are characterized for protection to the following limits * 15kV using the Human Body Model * 8kV using the Contact Discharge method specified in IEC 1000-4-2 * 15kV Air-gap
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1486E_100_061009
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DESCRIPTION
IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment. However, it does not specifically refer to integrated circuits. The SP1486E helps you design equipment to meet IEC 1000-4-2, without sacrificing board-space and cost for external ESD-protection components. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is a higher peak current in IEC 1000-4-2. Series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to EC 1000-4-2 is generally lower than that measured using the human body model. The air-gap test involves approaching the device with a charged probe. The contact discharge method connects the probe to the device before the probe is energized. MACHINE MoDEl The machine model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. The objective is to emulate the stress caused when I/O pins are contacted by handling equipment during test and assembly. 256 TRANSCEIVERS oN THE BuS The standard RS485 receiver input impedance is 12k (1 unit load). A standard driver can drive up to 32 unit loads. The SP1486E has only a 1/8th unit load receiver input impedance (96k), thereby allowing eight times as many, up to 256, transceivers to be connected in parallel on a communication line. Any combination of these devices and other RS485 transceivers up to a total of 32 unit loads may be connected to the line. loW PoWER SHuTDoWN MoDE Low-power shutdown mode is initiated by bringing both RE high and DE low simultaneously. While in shutdown devices typically draw only 50nA of supply current. DE and RE may be tied together and driven by a single control signal. Devices 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 shut-down. Enable times tzh and tzl apply when the part is not in low-power shutdown state. Enable times tzh(shdn) and tzl(shdn) apply when the parts are shut down. The drivers and receivers take longer to become enabled from low-power shutdown mode tzh(shdn) and tzl(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. First, a driver-current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range. Second, a thermalshutdown circuit forces the driver outputs into a high-impedance state if junction temperature becomes excessive.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
SP1486E_100_061009
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oRDERING INFoRMATIoN Part number SP1486EEN-L SP1486EEN-L/TR Temperature range From -40 to +85C From -40 to +85C Package Type NSOIC 8 pin NSOIC 8 pin
Note: "/TR" is for tape and reel option. Reel quantity is 2,500 for NSOIC. DATE 03/08/07 06/10/09 REVISION DESCRIPTION J 1.0.0 Legacy Sipex Datasheet Convert to Exar format, update ordering information, correct error on Driver Enable Times timing diagram and change revision to 1.0.0
Notice EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliability. 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.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com
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