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MAX3157 Dataheets PDF



Part Number MAX3157
Manufacturers Maxim
Logo Maxim
Description High CMRR RS-485 Transceiver
Datasheet MAX3157 DatasheetMAX3157 Datasheet (PDF)

19-1778; Rev 3; 11/01 High CMRR RS-485 Transceiver with ±50V Isolation General Description The MAX3157 is a high CMRR RS-485/RS-422 data-communications interface providing ±50V isolation in a hybrid microcircuit. A single +5V supply on the logic side powers both sides of the interface, with external ±50V capacitors transferring power from the logic side to the isolated side. Each MAX3157 contains one transmitter and one receiver and is guaranteed to operate at data rates up to 250kbps. Drivers .

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19-1778; Rev 3; 11/01 High CMRR RS-485 Transceiver with ±50V Isolation General Description The MAX3157 is a high CMRR RS-485/RS-422 data-communications interface providing ±50V isolation in a hybrid microcircuit. A single +5V supply on the logic side powers both sides of the interface, with external ±50V capacitors transferring power from the logic side to the isolated side. Each MAX3157 contains one transmitter and one receiver and is guaranteed to operate at data rates up to 250kbps. Drivers are short-circuit current limited and protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic high receiver output if the inputs are open, shorted, or connected to a terminated transmission line with all drivers disabled. The MAX3157 typically draws 25mA of supply current when unloaded or when fully loaded with the driver disabled. Supply current drops to 25µA when the device is placed in shutdown mode. The device is pin selectable between half- and full-duplex mode and also features independently programmable receiver and transmitter output phase through separate pins. The MAX3157 is a low-cost replacement for opto-isolated transceivers. For fully isolated RS-485/RS-422 transceivers, refer to the MAX1480 family data sheet. o ±50V Isolated Data Interface o +5V Single Supply o Low-Cost Replacement for Opto-Isolated Transceivers o True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compliance o Pin-Selectable Full/Half-Duplex Operation o Phase Controls to Correct for Twisted-Pair Reversal o 25µA Low-Power Shutdown Mode o Thermal Shutdown for Driver Overload Protection o 28-Pin SSOP Package o Slew Rate Limited Reduced EMI Features MAX3157 Ordering Information PART MAX3157CAI MAX3157EAI MAX3157CPI MAX3157EPI TEMP. RANGE 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C PIN-PACKAGE 28 SSOP 28 SSOP 28 PDIP 28 PDIP ________________________Applications Industrial Controls Level Translators Telecommunications Local Area Networks VCC 0.1µF VCC H/F TXP RXP MICRO DE DI RE RO GND ISOVCC A B Y Z YR ZR AR BR Pin Configurations appear at end of data sheet. Typical Operating Circuit MAX3157 RT = 100Ω RS-485 NODE RG C1LO C1HI C2LO C2HI ISOCOM ±50V C1 0.047µF C2 0.047µF C4 10nF GND OFFSET REMOTE GND ________________________________________________________________ Maxim Integrated Products REMOTE MICRO C3 1µF 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. High CMRR RS-485 Transceiver with ±50V Isolation MAX3157 ABSOLUTE MAXIMUM RATINGS All voltages referenced to GND unless otherwise noted. Supply Voltage (VCC).............................................................+7V Cable Ground (ISOCOM) ....................................................±75V Isolated Supply ISOVCC Relative to Cable Ground (.


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