MAX1480A/B/C/MAX1490A/B 19-0259 Rev 5 5/05 Complete, Isolated RS-485/RS-422 Data Interface General Description Next-Generation Device Features The MAX1480A/MAX1480B/MAX1480C/MAX1490A/ For Integrated ESD Protection MAX1480E/MAX1490E: 15kV ESD-Protected, MAX1490B are complete, electrically isolated, RS-485/ RS-422 data-communications interface solutions in a Isolated RS-485/RS-422 Data Interfaces hybrid microcircuit. Transceivers, optocouplers, and a For Space-Constrained Applications transformer provide a complete interface in a standard MAX3157: High CMRR, RS-485 Transceiver with DIP package. A single +5V supply on the logic side pow- 50V Isolation ers both sides of the interface. Ordering Information The MAX1480B/MAX1480C/MAX1490B feature reduced- slew-rate drivers that minimize EMI and reduce reflec- PART TEMP RANGE PIN-PACKAGE tions caused by improperly terminated cables, allowing MAX1480ACPI 0C to +70C 28 Wide Plastic DIP error-free data transmission at data rates up to 250kbps. MAX1480AEPI -40C to +85C 28 Wide Plastic DIP The MAX1480A/MAX1490A driver slew rate is not limited, Ordering Information continued at end of data sheet. allowing transmission rates up to 2.5Mbps. The Data rate for A parts is up to 2.5Mbps. Data rate for B and MAX1480A/B/C are designed for half-duplex communi- C parts is up to 250kbps. cation, while the MAX1490A/B feature full-duplex com- munication. Selection Table Drivers are short-circuit current limited and protected DRIVER against excessive power dissipation by thermal shut- HALF/ DATA SLEW- down circuitry that places the driver outputs into a high- ENABLE PART FULL RATE RATE impedance state. The receiver input has a fail-safe TIME DUPLEX (MBPS) LIMITED (s) feature that guarantees a known output (RO low for the MAX1480A/B/C, RO high for the MAX1490A/B) if the MAX1480A Half 2.5 No 0.2 input is open circuit. MAX1480B Half 0.25 Yes 35 The MAX1480A/MAX1480B/MAX1480C/MAX1490A/ MAX1480C Half 0.25 Yes 0.5 MAX1490B typically withstand 1600V (1 minute) or RMS MAX1490A Full 2.5 No 2000V (1 second). Their isolated outputs meet all RMS MAX1490B Full 0.25 Yes RS-485/RS-422 specifications. The MAX1480A/B/C are available in a 28-pin DIP package, and the MAX1490A/B are available in a 24-pin DIP package. Pin Configurations Applications TOP VIEW Isolated RS-485/RS-422 Data Interface V CC1 1 AC1 24 MAX1490A/B Transceivers for EMI-Sensitive Applications V CC2 2 23 AC2 Industrial-Control Local Area Networks 3 22 D1 ISO V CC1 Automatic Test Equipment D2 4 21 ISO RO DRV GND1 5 20 A HVAC/Building Control Networks FS 6 19 B Z SD 7 18 V 8 17 Y CC3 DI 9 16 ISO COM1 V ISO DI DRV 10 15 CC4 RO 14 ISO V 11 CC2 GND2 13 ISO RO LED 12 ISOLATION BARRIER DIP Pin Configurations continued at end of data sheet. 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MAX845 MAX488 MAX490Complete, Isolated RS-485/RS-422 Data Interface 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 MAX1480 CPI/MAX1490 CPG............................0C to +70C Control Input Voltage (ISO DE )....-0.3V to (ISO V + 0.3V) MAX1480 EPI/MAX1490 EPG .........................-40C to +85C CC Driver Input Voltage (ISO DI ) .......-0.3V to (ISO V + 0.3V) Storage Temperature Range .............................-65C to +160C 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.) (Notes 1, 2) CC FS CC A MIN MAX CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS f V = 0V 535 SWL FS Switch Frequency kHz f FS = V or open 725 SWH CC R = , +25C only 60 90 MAX1480A, L DE = V or open CC R = 54 120 L R = , +25C only 35 45 MAX1480B, L DE = V or open CC R = 54 95 L R = , +25C only 35 75 L MAX1480C, Operating Supply Current I mA CC DE = V or open CC R = 54 95 L R = , +25C only 100 150 L MAX1490A R = 54 170 L R = , +25C only 65 125 L MAX1490B 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 Current 10 pA 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 DE, DI V - 0.4 V IH CC Input Low Voltage V DE, DI 0.4 V IL Isolation Resistance R T = +25C, V = 50VDC 100 10,000 M ISO A ISO Isolation Capacitance C T = +25C, V = 50VDC 10 pF ISO A ISO Differential Driver Output V 8V OD1 (No Load) 2 MAX1480A/B/C/MAX1490A/B