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SP481E/SP485E Enhanced Low Power Half-Duplex RS-485 Transceivers
FEATURES +5V Only Low Power BiCMOS Driver/Receiver Enable for Multi-Drop configurations Low Power Shutdown Mode (SP481E) Enhanced ESD Specifications: +15KV Human Body Model +15KV IEC1000-4-2 Air Discharge +8KV IEC1000-4-2 Contact Discharge Available in RoHS Compliant, Lead Free Packaging: NSOIC and PDIP
RO 1
R
8
VCC
RE 2
7
B
DE 3
6
A
D
DI 4
SP485
Top View
5
GND
SP481E and SP485E Pinout (Top View)
DESCRIPTION The SP481E and the SP485E 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 Sipex's SP481 and SP485 devices as well as popular industry standards. As with the original versions, the SP481E and the SP485E feature Sipex's BiCMOS design allowing low power operation 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.
RO 1 RE 2 DE 3 DI 4
R
8 Vcc 7B 6A
D
SP481E and SP485E
5 GND
May11-2007
SP481E Low Power Half-Duplex RS485 Transceivers
(c) 2007 Sipex Corporation
1
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. VCC..........................................................................................................+7V Input Voltages Logic........................................................-0.3V to (VCC+0.5V) Drivers..................................................-0.3V to (VCC+0.5V) Receivers................................................................. 15V Output Voltages Logic........................................................-0.3V to (VCC+0.5V) Drivers...................................................................... 15V Receivers............................................-0.3V to (VCC+0.5V) Storage Temperature.......................................................-65C to +150C Power Dissipation per Package 8-pin NSOIC (derate 6.60mW/oC above +70oC)...........................550mW 8-pin PDIP (derate 11.8mW/oC above +70oC)............................1000mW
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V 5% unless otherwise noted. PARAMETERS SP481E/SP485E DRIVER DC Characteristics Differential Output Voltage Differential Output Voltage Differential Output Voltage Change in Magnitude of Driver Differential Output Voltage for Complimentary States Driver Common-Mode Output Voltage Input High Voltage Input Low Voltage Input Current Driver Short-Circuit Current VOUT = HIGH VOUT = LOW SP481E/SP485E DRIVER AC Characteristics Maximum Data Rate Driver Input to Output Driver Input to Output (SP485EMN ONLY) Driver Input to Output Driver Input to Output (SP485EMN ONLY) Driver Skew Driver Rise or Fall Time Driver Enable to Output High closed Driver Enable to Output Low closed Driver Disable Time from Low closed Driver Disable Time from High closed MIN. TYP. MAX. UNITS CONDITIONS
GND 2 1.5
VCC VCC VCC 0.2 3
Volts Volts Volts
Unloaded; R = ; see Figure 1 with load; R = 50; (RS-422); see Figure 1 with load; R = 27; (RS-485);see Figure 1
Volts Volts Volts Volts A mA mA
R = 27 or R = 50; see Figure 1 R = 27 or R = 50; see Figure 1 Applies to DE, DI, RE Applies to DE, DI, RE Applies to DE, DI, RE -7V VO +12V -7V VO +12V
2.0 0.8 10 250 250
10 20 20 30 30 60 80
Mbps ns ns
RE = 5V, DE = 5V; RDIFF = 54, CL1 = CL2 = 100pF tPLH; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 5 tPLH; RDIFF = 54, CLI = CL2 = 100pF; See Figures 3 and 5 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 5 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 and 5 see Figures 3 and 5, tSKEW = | tDPLH - tDPHL | From 10% to 90%; RDIFF = 54, CL1 = CL2 = 100pF; see Figures 3 & 6 CL = 100pF; see Figures 4 & 6; S2 CL = 100pF; see Figures 4 & 6; S1 CL = 100pF; see Figures 4 & 6; S1 CL = 100pF; see Figures 4 & 6; S2
20 20
30 30 5
60 80 10 40 70 70 70 70
ns ns ns ns ns ns ns ns
3
15 40 40 40 40
May11-2007
SP481E Low Power Half-Duplex RS485 Transceivers
(c) 2007 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V 5% unless otherwise noted.
PARAMETERS MIN. SP481E/SP485E RECEIVER DC Characteristics Differential Input Threshold -0.2 Differential Input Threshold -0.4 (SP485EMN ONLY) Input Hysteresis Output Voltage High 3.5 Output Voltage Low Three-State (High Impedance) Output Current Input Resistance 12 Input Current (A, B); VIN = 12V Input Current (A, B); VIN = -7V Short-Circuit Current 7 SP481E/SP485E RECEIVER AC Characteristics Maximum Data Rate 10 Receiver Input to Output 20 Receiver Input to Output Diff. Receiver Skew ItPLH-tPHLI Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable from Low Receiver Disable from High SP481E Shutdown Timing Time to Shutdown 50 Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Output Low POWER REQUIREMENTS Supply Voltage +4.75 Supply Current SP481E/485E No Load SP481E Shutdown Mode ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) 0 Industrial (_E_) -40 (_M_) -40 Storage Temperature -65 Package Plastic DIP (_P) NSOIC (_N)
May11-2007
TYP.
MAX.
UNITS
CONDITIONS
+0.2 +0.4 20 0.4 1 15 +1.0 -0.8 95
Volts Volts mV Volts Volts A k mA mA mA
-7V VCM +12V -7V VCM +12V VCM = 0V IO = -4mA, VID = +200mV IO = +4mA, VID = -200mV 0.4V VO 2.4V; RE = 5V -7V VCM +12V DE = 0V, VCC = 0V or 5.25V, VIN = 12V DE = 0V, VCC = 0V or 5.25V, VIN = -7V 0V VO VCC RE = 0V, DE = 0V tPLH; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 RDIFF = 54; CL1 = CL2 = 100pF; Figures 3 & 7 CRL = 15pF; Figures 2 & 8; S1 closed CRL = 15pF; Figures 2 & 8; S2 closed CRL = 15pF; Figures 2 & 8; S1 closed CRL = 15pF; Figures 2 & 8; S2 closed
45 45 13
100 100
Mbps ns ns ns
20
45 45 45 45
70 70 70 70
ns ns ns ns
200 40 40 300 300
600 100 100 1000 1000 +5.25
ns ns ns ns ns Volts
RE = 5V, DE = 0V CL = 100pF; See Figures 4 & 6; S2 closed CL = 100pF; See Figures 4 & 6; S1 closed CL = 15pF; See Figures 2 & 8; S2 closed CL = 15pF; See Figures 2 & 8; S1 closed
900 600 10
A A A
RE, DI = 0V or VCC; DE = VCC RE = 0V, DI = 0V or 5V; DE = 0V DE = 0V, RE=VCC
+70 +85 +125 +150
C C C C
SP481E Low Power Half-Duplex RS485 Transceivers
(c) 2007 Sipex Corporation
3
PIN FUNCTION
RO 1
R
8
VCC
Pin 1 - RO - Receiver Output. Pin 2 - RE - Receiver Output Enable Active LOW.
RE 2
7
B
Pin 3 - DE - Driver Output Enable Active HIGH. Pin 4 - DI - Driver Input. Pin 5 - GND - Ground Connection.
DE 3
6
A
D
DI 4
SP485
Top View
5
GND
Pin 6 - A - Driver Output/Receiver Input Non-inverting. Pin 7 - B - Driver Output/Receiver Input Inverting. Pin 8 - Vcc - Positive Supply 4.75VSP481E and SP485E Pinout (Top View)
A R VOD R B Figure 1. RS-485 Driver DC Test Load Circuit VOC Receiver Output
Test Point CRL 1k S1
1k VCC
S2 Figure 2. Receiver Timing Test Load Circuit
DI
A B
CL1 RDIFF CL2
A B
RO 15pF
Output Under C L Test
500
S1
VCC
S2 Figure 4. RS-485 Driver Timing Test Load #2 Circuit
Figure 3. RS-485 Driver/Receiver Timing Test Circuit
+3V DI 0V DRIVER OUTPUT B A
f = 1MHz; tR < 10ns; tF < 10ns 1.5V tPLH VO 1/2VO tDPLH tDPHL tPHL 1/2VO 1.5V
DIFFERENTIAL VO+ OUTPUT 0V VA - VB VO- tSKEW = | tDPLH - tDPHL |
Figure 5. Driver Propagation Delays
May11-2007
tR
tF
SP481E Low Power Half-Duplex RS485 Transceivers
(c) 2007 Sipex Corporation
4
INPUTS RE X X X X DE 1 1 0 1 LINE DI CONDITION 1 No Fault 0 No Fault X X X Fault
OUTPUTS B 0 1 Z Z A 1 0 Z Z
INPUTS RE DE 0 0 0 0 0 0 1 0
OUTPUTS A-B R +0.2V 1 -0.2V 0 Inputs Open 1 X Z
Table 2. Receive Function Truth Table
Table 1. Transmit Function Truth Table
+3V DE 0V 5V A, B VOL VOH A, B 0V
Figure 6. Driver Enable and Disable Times
f = 1MHz; tR < 10ns; tF < 10ns 1.5V tZL 2.3V Output normally LOW 1.5V tLZ 0.5V 0.5V tHZ
2.3V tZH
Output normally HIGH
V0D2+ A-B V0D2- VOH R VOL tPHL
0V
INPUT
0V
1.5V
OUTPUT
1.5V
tPLH f = 1MHz; tR < 10ns; tF < 10ns
tSKEW = | tPHL - tPLH |
Figure 7. Receiver Propagation Delays
+3V RE 0V 5V R VIL VIH R 0V 1.5V tZH Output normally HIGH 1.5V Output normally LOW 0.5V 0.5V tHZ 1.5V f = 1MHz; tR < 10ns; tF < 10ns tZL 1.5V tLZ
Figure 8. Receiver Enable and Disable Times
May11-2007 SP481E Low Power Half-Duplex RS485 Transceivers (c) 2007 Sipex Corporation
5
DESCRIPTION The SP481E and SP485E are half-duplex differential transceivers that meet the requirements of RS-485 and RS-422. Fabricated with a Sipex proprietary BiCMOS process, all three 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 receivers 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 differences. 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 54 across the differential outputs, the drivers can maintain greater than 1.5V voltage 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 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 15k (12k 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 enable 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 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 SP481E into Shutdown mode. In Shutdown, supply current will drop to typically 1A. ESD TOLERANCE The SP481E Family 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 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
May11-2007
SP481E Low Power Half-Duplex RS485 Transceivers
(c) 2007 Sipex Corporation
6
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 during normal handling such as in manufacturing areas where the ICs tend to be handled frequently. The IEC-1000-4-2, formerly IEC801-2, is generally used for testing ESD on equipment and
systems. For system manufacturers, they must guarantee a certain amount of ESD protection since the system itself is exposed to the outside environment and human presence. The premise with IEC1000-4-2 is that the system is required to withstand an amount of static electricity when ESD is applied to points and surfaces of the equipment that are accessible to personnel during normal usage. The transceiver IC receives most of the ESD current when the ESD source is applied to the connector pins. The test circuit for IEC1000-4-2 is shown on Figure 8. There are two methods within IEC1000-4-2, the Air Discharge method and the Contact Discharge method.
RC RC SW1 SW1
DC Power Source
RS RS SW2 SW2 CS CS
Device Under Test
Figure 7. ESD Test Circuit for Human Body Model
Contact-Discharge Module
RC RC SW1 SW1
DC Power Source
RS RS
RV SW2 SW2
CS CS
Device Under Test
RS and RV add up to 330 for IEC1000-4-2. 330 for
Figure 8. ESD Test Circuit for IEC1000-4-2
May11-2007 SP481E Low Power Half-Duplex RS485 Transceivers (c) 2007 Sipex Corporation
7
With the Air Discharge Method, an ESD voltage is applied to the equipment under test (EUT) through air. This simulates an electrically charged person ready to connect a cable onto the rear of the system only to find an unpleasant zap just before the person touches the back panel. The high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. This energy, whether discharged directly or through air, is predominantly a function of the discharge current rather than the discharge voltage. Variables with an air discharge such as approach speed of the object carrying the ESD potential to the system and humidity will tend to change the discharge current. For example, the rise time of the discharge current varies with the approach speed. The Contact Discharge Method applies the ESD current directly to the EUT. This method was devised to reduce the unpredictability of the ESD arc. The discharge current rise time is constant since the energy is directly transferred without the air-gap arc. In situations such as hand held systems, the ESD charge can be directly discharged to the equipment from a person already holding the equipment. The current is transferred on to the keypad or the serial port of the equipment directly and then travels through the PCB and finally to the IC. The circuit model in Figures 7 and 8 represent the typical ESD testing circuit used for all three methods. The CS is initially charged with the DC power supply when the first switch (SW1) is on. Now that the capacitor is charged, the second switch (SW2) is on while SW1 switches off. The
30A
15A
0A t=0ns t=30ns
i
t
Figure 9. ESD Test Waveform for IEC1000-4-2
voltage stored in the capacitor is then applied through RS, the current limiting resistor, onto the device under test (DUT). In ESD tests, the SW2 switch is pulsed so that the device under test receives a duration of voltage. For the Human Body Model, the current limiting resistor (RS) and the source capacitor (CS) are 1.5k an 100pF, respectively. For IEC-1000-42, the current limiting resistor (RS) and the source capacitor (CS) are 330 an 150pF, respectively. The higher CS value and lower RS value in the IEC1000-4-2 model are more stringent than the Human Body Model. The larger storage capacitor injects a higher voltage to the test point when SW2 is switched on. The lower current limiting resistor increases the current charge onto the test point.
SP481E, SP485E HUMAN BODY FAMILY MODEL
Driver Outputs Receiver Inputs 15kV 15kV
Air Discharge
15kV 15kV
IEC1000-4-2 Direct Contact
8kV 8kV
Level
4 4
May11-2007
SP481E Low Power Half-Duplex RS485 Transceivers
(c) 2007 Sipex Corporation
8
PACKAGE: 8 PIN PDIP
May11-2007
SP481E Low Power Half-Duplex RS485 Transceivers
(c) 2007 Sipex Corporation
9
PACKAGE: 8 PIN NSOIC
May11-2007
SP481E Low Power Half-Duplex RS485 Transceivers
(c) 2007 Sipex Corporation
10
ORDERING INFORMATION
Part Number Top Mark Temperature Range Package SP481ECN ................................. 481ECNYYWWH................0C to +70C ................................... 8-pin NSOIC SP481ECN/TR ............................ 481ECNYYWWH................0C to +70C ................................... 8-pin NSOIC SP481ECP .................................. SP481ECPYYWW..............0C to +70C ...................................... 8-pin PDIP SP481EEN ................................. .481EENYYWW................-40C to +85C .................................. 8-pin NSOIC SP481EEN/TR ........................... .481EENYYWW................-40C to +85C .................................. 8-pin NSOIC SP481EEP ................................. SP481EEPYYWW............-40C to +85C ..................................... 8-pin PDIP SP485ECN ................................. 485ECNYYWW...................0C to +70C ................................... 8-pin NSOIC SP485ECN/TR ............................ 485ECNYYWW...................0C to +70C ................................... 8-pin NSOIC SP485ECP ................................. SP485ECPYYWW...............0C to +70C ..................................... 8-pin PDIP SP485EEN ................................ 485EENYYWW...................-40C to +85C ................................. 8-pin NSOIC SP485EEN/TR .......................... 485EENYYWW...................-40C to +85C ................................. 8-pin NSOIC SP485EEP ................................ SP485EEPYYWW...............-40C to +85C .................................... 8-pin PDIP SP485EMN ............................. SP485EMNYYWW................-40C to +125C ............................... 8-pin NSOIC SP485EMN/TR ....................... SP485EMNYYWW................-40C to +125C ............................... 8-pin NSOIC Available in lead free packaging. To order add "-L" suffix to part number. Example: SP485EEN/TR = standard; SP485EEN-L/TR = lead free /TR = Tape and Reel Pack quantity is 2500 for Narrow SOIC.
For latest information on Product Status and ordering Samples:
http://www.sipex.com/productDetails.aspx?part=SP481E
http://www.sipex.com/productDetails.aspx?part=SP485E
Sipex Corporation
Corporation
Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
May11-2007
SP481E Low Power Half-Duplex RS485 Transceivers
(c) 2007 Sipex Corporation
11

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