MAX1480E/MAX1490E 19-1940 Rev 0 4/01 15kV ESD-Protected, Isolated RS-485/RS-422 Data Interfaces General Description Features Isolated Data Interface, Guaranteed to 1260V The MAX1480EA/MAX1480EC/MAX1490EA/MAX1490EB RMS are complete, electrically isolated, RS-485/RS-422 data (1min) communications interface solutions in a hybrid microcir- 15kV ESD Protection on I/O Pins cuit. The RS-485/RS-422 I/O pins are protected against Slew-Rate Limited for Errorless Data 15kV electrostatic discharge (ESD) shocks, without Transmission (MAX1480EC/MAX1490EB) latchup. Transceivers, optocouplers, and a transformer High-Speed, Isolated, 2.5Mbps RS-485/RS-422 provide a complete interface in a standard DIP package. Interface (MAX1480EA/MAX1490EA) A single +5V supply on the logic side powers both sides of the interface. Full-Duplex Data Communication (MAX1490EA/MAX1490EB) The MAX1480EC/MAX1490EB feature reduced-slew-rate drivers that minimize EMI and reduce reflections caused Single +5V Supply by improperly terminated cables, allowing error-free data Current Limiting and Thermal Shutdown for transmission at data rates up to 160kbps. The Driver Overload Protection MAX1480EA/MAX1490EA driver slew rate is not limited, Standard 0.6in DIP Packages allowing transmission rates up to 2.5Mbps. The 28-Pin DIP (MAX1480EA/MAX1480EC) MAX1480EA/MAX1480EC are designed for half-duplex 24-Pin DIP (MAX1490EA/MAX1490EB) communication, while the MAX1490EA/MAX1490EB fea- ture full-duplex communication. Ordering Information Drivers are short-circuit current limited and protected against excessive power dissipation by thermal shut- PART TEMP. RANGE PIN-PACKAGE down circuitry that places the driver outputs into a high- MAX1480EACPI 0C to +70C 28 Wide Plastic DIP* impedance state. The receiver input has a fail-safe MAX1480EAEPI -40C to +85C 28 Wide Plastic DIP* feature that guarantees a known output (RO low for the Ordering Information continued at end of data sheet. MAX1480EA/MAX1480EC, RO high for the MAX1490EA/ Data rate for A parts is up to 2.5Mbps. Data rate for C parts is MAX1490EB) if the input is open circuit. up to 250kbps. The MAX1480EA/MAX1480EC/MAX1490EA/MAX1490EB *See Reliability section at end of data sheet. withstand 1260V (1min) or 1520V (1s). Their iso- RMS RMS lated outputs meet all RS-485/RS-422 specifications. The Pin Configurations MAX1480EA/MAX1480EC are available in a 28-pin DIP package, and the MAX1490EA/MAX1490EB are available in a 24-pin DIP package. TOP VIEW V . CC1 1 AC1 24 MAX1490EA/ MAX1490EB V CC2 2 23 AC2 Applications 3 Isolated RS-485/RS-422 Data Interface D1 22 ISO V CC1 Transceivers for EMI-Sensitive Applications D2 4 21 ISO RO DRV Industrial-Control Local Area Networks 5 GND1 20 A Automatic Test Equipment FS 6 19 B HVAC/Building Control Networks SD 7 18 Z Telecom Y V 8 17 CC3 DI 9 16 ISO COM1 V 10 15 ISO DI DRV CC4 RO ISO V 11 14 CC2 GND2 12 13 ISO RO LED ISOLATION BARRIER DIP Pin Configurations continued at end of data sheet. Selector Guide appears at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. MAX845E MAX488E MAX490E15kV ESD-Protected, Isolated RS-485/RS-422 Data Interfaces ABSOLUTE MAXIMUM RATINGS With Respect to GND LED Forward Current (DI, DE, ISO RO LED) ......................50mA Supply Voltage (V )..........................................-0.3V to +6V Continuous Power Dissipation (T = +70C) CC A Control Input Voltage (SD, FS)..............-0.3V to (V + 0.3V) 24-Pin Plastic DIP (derate 8.7mWC above +70C) ....696mW CC Receiver Output Voltage (RO, RO).......-0.3V to (V + 0.3V) 28-Pin Plastic DIP (derate 9.09mW/C above +70C) .727mW CC Output Switch Voltage (D1, D2).......................................+12V Operating Temperature Ranges With Respect to ISO COM MAX1480E CPI/MAX1490E CPI ........................0C to +70C Control Input Voltage (ISO DE )....-0.3V to (ISO V + 0.3V) MAX1480E EPI/MAX1490E EPI......................-40C to +85C CC Driver Input Voltage (ISO DI ) .......-0.3V to (ISO V + 0.3V) Storage Temperature Range .............................-65C to +150C CC Receiver Output Voltage (ISO RO ) ..-0.3V to (ISO V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C CC Driver Output Voltage (A, B, Y, Z) ......................-8V to +12.5V Receiver Input Voltage (A, B).............................-8V to +12.5V Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = +5V 10%, V = V , T = T to T , unless otherwise noted. Typical values are at V = +5V and T = +25C.) CC FS CC A MIN MAX CC A (Notes 1, 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS f V = 0 535 SWL FS Switch Frequency kHz f FS = V or open 725 SWH CC R = 85 120 MAX1480EA, L mA DE = V or open CC R = 54 145 L MAX1480EC, R = 55 120 L DE = V or open CC R = 54 120 L Operating Supply Current I mA CC R = 130 180 L MAX1490EA R = 54 180 L R = 65 125 L MAX1490EB R = 54 130 L Shutdown Supply Current I SD = V 0.2 A SHDN CC (Note 3) V High 2.4 SDH Shutdown Input Threshold V V Low 0.8 SDL Shutdown Input Leakage 10 pA Current V High 2.4 FSH FS Input Threshold V V Low 0.8 FSL FS Input Pullup Current FS low 50 A FS Input Leakage Current FS high 10 pA Input High Voltage V V - 0.4 V IH DE, DI, Figures 1 and 2 CC Input Low Voltage V DE, DI, Figures 1 and 2 0.4 V IL Isolation Voltage V T = +25C, 1min (Note 4) 1260 V ISO A RMS Isolation Resistance R T = +25C, V = 50VDC 100 10,000 M ISO A ISO Isolation Capacitance C T = +25C, f = 1MHz 10 pF ISO A Differential Driver Output V 8 V OD1 (No Load) Differential Driver Output R = 50 (RS-422) 2 V V OD2 (with Load) R = 27 (RS-485), Figure 4 1.5 5 2 MAX1480E/MAX1490E