MAX3430 19-2756 Rev 1 4/03 80V Fault-Protected, Fail-Safe, 1/4-Unit Load, +3.3V RS-485 Transceiver General Description Features The MAX3430 fault-protected RS-485 transceiver features 80V Fault Protection 80V protection from overvoltage signal faults on commu- 12kV ESD Protection nication bus lines. Each device contains one driver and one receiver, and the output pins can withstand faults, +3.3V Operation with respect to ground, of up to 80V. Even if the faults Internal Slew-Rate Limiting occur when the transceiver is active, shut down, or pow- ered off, the device will not be damaged. The MAX3430 250kbps Data Rate operates from a 3.3V supply and features a slew-rate-lim- Allows Up to 128 Transceivers on the Bus ited driver that minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error- -7V to +12V Common-Mode Input Voltage Range free data transmission at data rates up to 250kbps. The True Fail-Safe Inputs MAX3430 has a 1/4-unit-load receiver input impedance allowing up to 128 transceivers on a single bus and fea- Hot-Swap Input Structure on DE tures fail-safe circuitry, which guarantees a logic-high Available in 8-Pin SO and PDIP Packages receiver output when the receiver inputs are open. Hot-swap circuitry eliminates false transitions on the data cable during circuit initialization or connection to a live backplane. Short-circuit current limiting and ther- mal-shutdown circuitry protect the driver against exces- sive power dissipation. Ordering Information The MAX3430 is available in 8-pin SO and 8-pin PDIP PART TEMP RANGE PIN-PACKAGE packages, and is specified over commercial and indus- trial temperature ranges. MAX3430CPA 0C to +70C 8 Plastic DIP MAX3430CSA 0C to +70C 8 SO Applications MAX3430EPA -40C to +85C 8 Plastic DIP RS-422/RS-485 Communications MAX3430ESA -40C to +85C 8 SO Lighting Systems Industrial-Control Local Area Networks Profibus Applications Multimaster RS-485 Networks Pin Configuration and Typical Operating Circuit TOP VIEW V DE CC 0.1 F RO MAX3430 R 1 8 V CC 1 8 R RO D DI B B RE 2 7 2 B 7 RE Rt Rt 3 6 DE 3 A DE 6 A A 4 5 RO R DI D DI 4 D GND 5 GND RE DIP/SO 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.80V Fault-Protected, Fail-Safe, 1/4-Unit Load, +3.3V RS-485 Transceiver ABSOLUTE MAXIMUM RATINGS (All voltages are referenced to GND.) Operating Temperature Ranges V ........................................................................................+5V MAX3430C .....................................................0C to +70C CC RE, DE, DI...................................................-0.3V to (V + 0.3V) MAX3430E ..................................................-40C to +85C CC Driver Output Voltage (A, B) (Note 1)..................................80V Junction Temperature......................................................+150C Receiver Input Voltage (A, B) (Note 1) ................................80V Storage Temperature Range .............................-65C to +150C RO ..............................................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C CC Continuous Power Dissipation (T = +70C) A 8-Pin SO (derate 5.88mW/C above +70C)................471mW 8-Pin Plastic DIP (derate 9.09mW/C above +70C) ...727mW Note 1: A, B must be terminated with 54 or 100 to guarantee 80V fault protection. 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. DC ELECTRICAL CHARACTERISTICS (V = +3.3V 10%, T = T to T , unless otherwise noted. Typical values are at V = +3.3V and T = +25C.) CC A MIN MAX CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DRIVER Figure 1, R = 100 2.0 V L CC Differential Driver Output V V OD Figure 1, R = 54 1.5 V L CC Change in Magnitude of V Figure 1, R = 100 or 54 (Note 2) 0.2 V OD L Differential Output Voltage Driver Common-Mode Output V Figure 1, R = 100 or 54 V / 2 3 V OC L CC Voltage Change in Magnitude of V Figure 1, R = 100 or 54 (Note 2) 0.2 V OC L Common-Mode Voltage DRIVER LOGIC Driver Input High Voltage V DI 2.0 V IH Driver Input Low Voltage V DI 0.8 V IL Driver Input Current I DI 1A IN 0 V 12V (Note 3) +250 Driver Short-Circuit Output OUT I mA OSD Current -7V V V (Note 3) -250 OUT CC (V - 1V) V 12V (Note 3) +10 Driver Short-Circuit Foldback CC OUT I mA OSDF Output Current -7V V 1V (Note 3) -10 OUT RECEIVER DE = GND, RE = GND, V = +12V 250 IN A Input Current (A, B) I DE = GND, RE = GND, V = -7V -200 A, B IN V = -80V to +80V -6 +6 mA IN Receiver Differential Threshold V -7V V 12V -200 -50 mV TH CM Voltage Receiver Input Hysteresis V V + V = 0 25 mV TH A B 2 MAX3430