SP1485E SIPEX | Alldatasheet
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Rev:C Date: 02/26/04 SP1485E Low Power Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation SP1485E ■ +5V supply ■ Low Power BiCMOS ■ Driver/Receiver Enable for Multi-Drop configurations ■ Available in 8 Pin NSOIC or PDIP packages ■ Enhanced ESD Specifications: +15KV Human Body Model +15KV IEC1000-4-2 Air Discharge +8KV IEC1000-4-2 Contact Discharge Enhanced Low Power Half-Duplex RS-485 Transceivers PRELIMINARY R D RO 1 RE 2 DE 3 DI 4
8 Vcc
5 GND
The SP1485E is a half-duplex transceiver that meets the specifications of RS-485 and RS- 422 serial protocols with enhanced ESD performance. The ESD tolerance has been improved on this device to over +15KV for both Human Body Model and IEC1000-4-2 Air Discharge Method. This device is pin-to-pin compatible with Sipex's SP485 devices as well as popular industry standards. As with the original version, the SP1485E features Sipex's BiCMOS design allowing low power operation without sacrificing performance. The SP1485E meets the requirements of the RS-485 and RS-422 protocols up to 20Mbps under load.
DESCRIPTION
8 Pin - nSOICDE
A DI GND BLOCK DIAGRAM
Rev:C Date: 02/26/04 SP1485E Low Power Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation 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. V Input Voltages TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS 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 = 27 Ω or R = 50Ω; see Figure 1 Driver Common-Mode Output Voltage 3 Volts R = 27 Ω 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 SP1485E DRIVER AC Characteristics Maximum Data Rate 20 Mbps RE = 5V, DE = 5V; R DIFF = 54Ω, C L1 = CL2 = 100pF Driver Input to Output 10 30 40 ns t PLH ; RDIFF = 54Ω, CL1 = CL2 = 100pF; see Figures 3 and 5 10 ns tPHL ; RDIFF = 54Ω, CLI = CL2 = 100pF; Driver Skew 3 ns see Figures 3 and 5, tSKEW = | tDPLH - tDPHL | Driver Rise or Fall Time 8 20 ns From 10% to 90%; R DIFF = 54Ω, C L1 = 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; S1 closed Driver Disable Time from Low 40 70 ns C L = 100pF; see Figures 4 & 6; S1 closed Driver Disable Time from High 40 70 ns C L = 100pF; see Figures 4 & 6; S2 closed Output Voltages Power Dissipation per Package 8-pin NSOIC (derate 6.60mW/
ELECTRICAL CHARACTERISTICS
Rev:C Date: 02/26/04 SP1485E Low Power Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP148 5E 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 ≤ VO ≤ 2.4V; RE = 5V Input Resistance 12 15 k Ω -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 ≤ VO ≤ VCC SP1485E RECEIVER AC Characteristics Maximum Data Rate 20 Mbps RE = 0V, DE = 0V Receiver Input to Output 15 40 50 ns t PLH ; RDIFF = 54Ω, C L1 = CL2 = 100pF; Figures 3 & 7 15 ns tPHL ; RDIFF = 54Ω, CLI = CL2 = 100pF Diff. Receiver Skew ItPLH -tPHL I5 1 0 n s R DIFF = 54Ω; CL1 = CL2 = 100pF; Figures 3 & 7 Receiver Enable to Output Low 45 70 ns C RL = 15pF; Figures 2 & 8; S1 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; S1 closed Receiver Disable from High 45 70 ns C RL = 15pF; Figures 2 & 8; S2 closed POWER REQUIREMENTS Supply Voltage +4.75 +5.25 Volts Supply Current SP1485E No Load 900 µA RE, DI = 0V or VCC ; DE = VCC 600 µA RE = 0V, DI = 0V or 5V; DE = 0V 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 Plastic DIP (_P) NSOIC (_N) SPECIFICATIONS (continued)
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 7 – B – Driver Output/Receiver Input Inverting. Pin 8 – Vcc – Positive Supply 4.75V<Vcc< 5.25V. Figure 5. Driver Propagation Delays
00 Inputs Open 1
10 X Z
Table 1. Transmit Function Truth Table Table 2. Receive Function Truth Table Figure 8. Receiver Enable and Disable Times Figure 7. Receiver Propagation Delays Figure 6. Driver Enable and Disable Times
Rev:C Date: 02/26/04 SP1485E Low Power Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation fail-safe feature. Fail-safe guarantees that the receiver output will be in a HIGH state when the input is left unconnected. ESD TOLERANCE The SP1485E incorporates ruggedized ESD cells on all driver output and receiver input pins. The ESD structure is improved over our previ- ous family for more rugged applications and environments sensitive to electro-static dis- charges 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 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 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 The SP1485E is half-duplex differential trans- ceivers that meet the requirements of RS-485 and RS-422. Fabricated with a Sipex proprietary BiCMOS process, this product requires a frac- tion 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 SP1485E are differen- tial 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 out- puts, the drivers can maintain greater than 1.5V voltage levels. The drivers of the SP1485E have an enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differ- ential driver outputs. A logic LOW on DE (pin 3) will tri-state the driver outputs. The transmitters of the SP1485E will operate up to at least 20Mbps. Receivers The 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 re- ceivers of the SP1485E 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 SP1485E will operate up to at least 20Mbps. The receiver for each of the two devices is equipped with the
system before he or she even touches the system. power supply when the first switch (SW1) is on. receives a duration of voltage. capacitor (CS) are 330Ω an 150pF, respectively. Figure 9. ESD Test Waveform for IEC1000-4-2
Rev:C Date: 02/26/04 SP1485E Low Power Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation D ALTERNATE END PINS (BOTH ENDS) D1 = 0.005" min. (0.127 min.) E PACKAGE: PLASTIC DUAL–IN–LINE (NARROW) DIMENSIONS (Inches) Minimum/Maximum (mm) A = 0.210" max. (5.334 max). C ØL A1 = 0.015" min. (0.381min.) B e = 0.100 BSC (2.540 BSC) eA = 0.300 BSC (7.620 BSC) B C D E L Ø 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356) 0.355/0.400 (9.017/10.160) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0°/ 15° (0°/15°) 8–PIN
Rev:C Date: 02/26/04 SP1485E Low Power Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation SEE VIEW C Ø 1.65 DIMENSIONS Minimum/Maximum (mm)
8 Pin NSOIC
(JEDEC MS-012, AA - VARIATION) COMMON HEIGHT DIMENSION A b c L e E 1.35
4.90 BSC
0.40 0.31 0.51 SYMBOL MIN NOM MAX 0.10 - 0.25 D 1.75 1.25 0.17 0.25
6.00 BSC
3.90 BSC
1.27 BSC
1.27
1.04 REF
0.25 BSC
15º A A2 SEATING PLANE SIDE VIEW L ØØ1 Seating Plane Gauge Plane VIEW C TO P VIEW e E E/2 A INDEX AREA (D/2 X E1/2) E1/2 D b
8 PIN NSOICPACKAGE:
c WITH PLATING BASE METAL b CONTACT AREA PACKAGE: 8 PIN NSOIC
Rev:C Date: 02/26/04 SP1485E Low Power Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation
ORDERING INFORMATION
Model Temperature Range Package Please consult the factory for pricing and availability on a Tape-On-Reel option. Corporation ANALOG EXCELLENCE 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. Sipex Corporation Headquarters and Sales Office
233 South Hillview Drive
Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sales Office
22 Linnell Circle
Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com DATE REVISION DESCRIPTION 11/11/03 A Implemented tracking revision. 12/18/03 B Added Driver and Receiver TPLH/TPHL AC Characteristics. 02/26/04 C Changed Driver Input to Output values from 20ns (typ), 30ns (max) to 30ns (typ), 40ns (max). Changed Receiver Input to Output values from 25ns (typ), 70ns (max) to 40ns (typ), 50ns (max) .