® ISO518 ISO 518 ISO 518 For most current data sheet and other product information, visit www.burr-brown.com Bidirectional ISOLATED DIGITAL COUPLERS FEATURES DESCRIPTION ● LOW POWER CONSUMPTION: < 12mW per Channel The ISO518 is an 8-channel, isolated, bidirectional digital coupler based on the Burr-Brown capacitive barrier technology. ● 1500Vrms ISOLATION: 100% Tested by Partial Discharge ● DOUBLE BUFFERED DESIGN FOR EASY INTEGRATION INTO BUS-BASED SYSTEMS ● TRI-STATE OUTPUTS ● 24-PIN PDIP OR GULL WING PACKAGES ● 2MWORDS/S TRANSFER RATE The ISO518 is designed with input and output buffers for ease of integration into a µP bus system. All data pins are I/O under the control of the TX pins. Input and output buffers are controlled by the latch enable pins. This feature of the ISO518, which allows multiple access to a data bus, requires extra circuitry when using an alternative solution. The ISO518 will transfer an 8-bit word at rates up to 2Mwords/s without the skew problems associated in implementing this function with optocouplers. The ISO518 is available in 24-pin PDIP or 24-pin Gull Wing packages. Both are specified for operation from –40°C to +85°C. APPLICATIONS ● PARALLEL ADCs/DACs ● DIGITAL INTERFACES ● DIGITAL TRANSMISSION ● GROUND-LOOP ISOLATION DATA I/O L L S S L L A A H H A A T T I I T T C C F F C C H H T T H H LEA DATA I/O LEB TXB/RXB TXA/RXA ISO518 Functional Block Diagram International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 ® © 1998 Burr-Brown Corporation PDS-1423B 1 Printed in U.S.A. June, 1999 ISO518 SPECIFICATIONS At TA = +25°C, and VS = +5V, unless otherwise noted. ISO518P, P-U PARAMETER ISOLATION Rated Voltage, Continuous Partial Discharge Voltage Barrier Impedance Leakage Current VISO TIMING LE Width (LOW) LE Width (HIGH) Data Set-Up to LEA/B Data Hold from LEA/B Propagation Delay Data Output Delay Output Rise and Fall Time Output Enable Output Disable Max Data Transfer Rate Skew MIN 50Hz, 60Hz 1s, 5 x 5pC/cycle(1) 1500 2500 VIH VIL IL CIN VOH VOL I OS tWL tWH t SU tH tPD tOD tRF t EN tDIS See Note 2 See Note 2 TYP MAX >1014 || 10 1 240V, 60Hz 2500V, 50Hz PDIP = “P” and “U” Package PDIP = “P” and “U” Package 5kV/µs Edge Creepage Distance Internal Isolation Distance Transient Recovery Time DC CHARACTERISTICS High Level Input Voltage Low Level Input Voltage Input Leakage Current Input Capacitance High Level Output Voltage Low Level Output Voltage Output Short-Circuit Current CONDITIONS 12 11 0.1 1 2 0.8 5 5 IOH = 6mA I OL = 6mA IS, max VS –1 0.4 30 LEA/B HIGH to LOW LEA/B HIGH to LOW LEA/B LOW to Data Out LEO HIGH to Data Out Channels 10% to 90% Load = 50pF OE to Data Valid HIGH or LOW OE to Data HI-Z 100 15 0 20 9 520 35 14 35 35 2 Between Any Two Channels POWER Supply Voltage Supply Current VSA, VSB ISA / B Supply Current ISB /A Either Side Transmit Side DC Transmit Side DC Max Rate Receive Side DC Receive Side Max Rate TEMPERATURE RANGE Operating Storage Thermal Resistance, θJA 5 4.5 5 7 8 12 –40 –40 +75 UNITS Vrms Vrms Ω/pF µA µA mm mm µs V V nA pF V V mA ns ns ns ns ns ns ns ns ns Mw/s ns 5.5 10 15 12 20 V mA mA mA mA +85 +125 °C °C °C/W NOTES: (1) All devices receive a 1s test. Failure criterion is > 5pC pulses of ≥ 5pC per cycle. (2) Logic inputs are HCT-type and thresholds are a function of power supply voltage with approximately 400mV hysteresis. The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems. ® ISO518 2 PIN CONFIGURATION FUNCTIONAL DESCRIPTION Top View DIP NAME FUNCTION DA (0 - 7) Data Bus A. The logic levels on these pins are transmitted to, or received from the corresponding pins on data bus B. VSA 1 24 GNDB DB (0 -7) Data Bus B. The logic levels on these pins are transmitted to, or received from the corresponding pins on data bus A. TXA/RXA 2 23 LEB LEA (1) Latch Enable A. Latch enable signal for the A data buffer. DB0 LEB(1) Latch Enable B. Latch enable signal for the B data buffer. TX/RXA(2) Transmit/Receive Control for Side A. TX/RXB(2) Transmit/Receive Control for Side B. DA0 3 22 DA1 4 21 DB1 DA2 5 20 DB2 DA3 6 19 DB3 DA4 7 18 DB4 DA5 8 17 DB5 DA6 9 16 DB6 DA7 10 15 DB7 LEA 11 14 TXB/RXB GNDA 12 13 VSB ISO518 NOTES: (1) In transmit mode (TX/RX = 1), a logic 0 (LOW) will latch the input buffer data into the input register and initialize the transmission. A logic 0 (LOW) will latch the internal buffer data into the output register and prevent any further changes in the output data. A logic 1 (HIGH) will pass the internal buffer data to the output register and permit each new set of data to appear as soon as available after transmission. (2) A logic 1 (HIGH) will set that side to transmit mode and the same side’s data bus to input mode. A logic 0 (LOW) will set that side to receive mode and the same side’s data bus to output mode. ELECTROSTATIC DISCHARGE SENSITIVITY Electrostatic discharge can cause damage ranging from performance degradation to complete device failure. BurrBrown Corporation recommends that all integrated circuits be handled and stored using appropriate ESD protection methods. ABSOLUTE MAXIMUM RATINGS Supply Voltage: VSA ............................................................. –0.5V to +6V VSB ............................................................. –0.5V to +6V Maximum Input Current, Any Input .................................................. 20mA Continuous Isolation Voltage ..................................................... 1500Vrms Storage Temperature ...................................................... –40°C to +125°C Lead Temperature (soldering, 10s) ................................................. 300°C ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet published specifications. PACKAGE INFORMATION PRODUCT PACKAGE PACKAGE DRAWING NUMBER(1) ISO518P ISO518P-U 24-Pin Plastic DIP 24-Pin Gull Wing Surface Mount 167 167-4 NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. ® 3 ISO518 OPERATION the input buffer without affecting the transmission. However, should LEA go LOW again before the barrier transmission is complete, the barrier transmission will terminate and restart with the new data (see Figure 2). This will not affect the output data which only changes at the end of a transmission or under control of LEB. Data is transmitted across the barrier under the control of LEA or LEB; the direction being decided by TXA/RXA and TXB/RXB. Assume side A is set to transmit and side B is set to receive. With LEA LOW, no data is passed to the input buffer and no barrier transmission takes place. When LEA is HIGH, the input data is passed to the input buffer ready for transmission across the barrier on the falling edge of LEA. On the falling edge of LEA, the data is latched to prevent any subsequent input data changes interfering with the single barrier transmission. Should LEA go HIGH again before the transmission is complete, the data in the input pins will be loaded into DATA BUS: A n–1 If LEB is HIGH, the output data will change at the end of transmission. If LEB is LOW the output data will change when LEB next goes HIGH. In both cases, all data bits will change together, guaranteeing the specified skew performance. It should also be noted that LEB may be used to ignore transmitted data if required. DATA n DATA n+1 ACTIVE ACTIVE LEA BARRIER LEB DATA BUS: B DATA n DATA n–1 FIGURE 1. Data Transfer. DATA BUS: A n–1 DATA n DATA n+1 DATA n+2 LEA BARRIER ACTIVE ACTIVE ACTIVE LEB DATA BUS: B DATA n–1 FIGURE 2. Data Transfer—Restart. ® ISO518 4 DATA +n DATA BUS: A n+1 DATA n DATA n–1 tWH DATA n–2 tWL LEA/B LEA BARRIER ACTIVE ACTIVE DATA IN ACTIVE DATA OUT Transient tPD DATA BUS: B DATA n+1 Invalid tH DATA n-1 tSU FIGURE 3. Data Corruption. FIGURE 4. Transmission Timing Diagram. tOD LE DATA OUT TX/RX tDIS tEN FIGURE 5. Output Data Timing. VSA D A T A µP B U S I/O VSB ISO518 1 13 DA0 3 22 DB0 DA1 4 21 DB1 DA2 5 A 20 DB2 DA3 6 T 19 DB3 DA4 7 C 18 DB4 L H L S S L L A H H A A T I I T T C F F C C H T T H H DA5 8 17 DB5 DA6 9 16 DB6 DA7 10 15 DB7 11 GNDA A D D R E S S LEI TXA/RXA GNDA D A T A µP B U S I/O 23 11 23 LEB 2 14 TXB/RXB 12 24 A D D R E S S GNDB GNDB FIGURE 6. Burr-Brown I/O System using ISO518. ® 5 ISO518