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Part: MAX3074EESA
Category:
Interface and Interconnect
Description: MAX3070E, MAX3071E, MAX3072E, MAX3073E, MAX3074E, MAX3075E, MAX3076E, MAX3077E, MAX3078E, MAX3079E +3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
Company: Maxim Integrated Products
Datasheet: Download MAX3074EESA datasheet File size : 514 kB
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Datasheet text preview:
19-2668; Rev 1; 1/03
+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
General Description
The MAX3070EMAX3079E 3.3V, ±15kV ESD-protected, RS-485/RS-422 transceivers feature one driver and one receiver. These devices include fail-safe circuitry, guaranteeing a logic-high receiver output when receiver inputs are open or shorted. The receiver outputs a logic high if all transmitters on a terminated bus are disabled (high impedance). The MAX3070EMAX3079E include a hot-swap capability to eliminate false transitions on the bus during power-up or hot insertion. The MAX3070E/MAX3071E/MAX3072E feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing e r r o r - f r e e data transmission up to 250kbps. The MAX3073E/MAX3074E/MAX3075E also feature slewr a t e - l i m i t e d drivers but allow transmit speeds up to 500kbps. The MAX3076E/MAX3077E/MAX3078E driver slew rates are not limited, making transmit speeds up to 1 6 M b p s possible. The MAX3079E slew rate is pin selectable for 250kbps, 500kbps, and 16Mbps. The MAX3072E/MAX3075E/MAX3078E are intended for h a l f - d u p l e x communications, and the MAX3070E/ MAX3071E/MAX3073E/MAX3074E/MAX3076E/MAX307 7E are intended for full-duplex communications. The MAX3079E is selectable for half-duplex or full-duplex operation. It also features independently programmable r e c e i v e r and transmitter output phase through separate pins. The MAX3070EMAX3079E transceivers draw 800µA of supply current when unloaded or when fully loaded with the drivers disabled. All devices have a 1/8-unit l o a d receiver input impedance, allowing up to 256 transceivers on the bus. o 3.3V Operation o Electrostatic Discharge (ESD) Protection for RS-485 I/O Pins ±15kV Human Body Model o True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compatibility o Hot-Swap Input Structure on DE and RE o Enhanced Slew-Rate Limiting Facilitates ErrorFree Data Transmission (MAX3070EMAX3075E/MAX3079E) o Low-Current Shutdown Mode (Except MAX3071E/MAX3074E/MAX3077E) o Pin-Selectable Full-/Half-Duplex Operation (MAX3079E) o Phase Controls to Correct for Twisted-Pair Reversal (MAX3079E) o Allow Up to 256 Transceivers on the Bus o Available in Industry-Standard 8-Pin SO Package
Features
MAX3070EMAX3079E
Ordering Information
PART MAX3070EEPD MAX3070EESD MAX3070EAPD MAX3070EASD MAX3071EEPA MAX3071EESA MAX3071EAPA MAX3071EASA TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +125°C -40°C to +125°C -40°C to +85°C -40°C to +85°C -40°C to +125°C -40°C to +125°C PIN-PACKAGE 14 Plastic DIP 14 SO 14 Plastic DIP 14 SO 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO
Applications
Lighting Systems Industrial Control Telecom Security Systems Instrumentation
Ordering Information continued at end of data sheet.
Selector Guide, Pin Configurations, and Typical Operating Circuits appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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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.
+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers MAX3070EMAX3079E
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND) Supply Voltage (VCC)....+6V Control Input Voltage (RE, DE, SLR, H/F, TXP, RXP)......-0.3V to +6V Driver Input Voltage (DI)..........-0.3V to +6V Driver Output Voltage (Z, Y, A, B) .....-8V to +13V Receiver Input Voltage (A, B)...-8V to +13V Receiver Input Voltage Full Duplex (A, B) ........-8V to +13V Receiver Output Voltage (RO)...........-0.3V to (VCC + 0.3V) Driver Output Current .....±250mA Continuous Power Dissipation (TA = +70°C) 8-Pin SO (derate 5.88mW/°C above +70°C) ........471mW 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) .....727mW 14-Pin SO (derate 8.33mW/°C above +70°C) ......667mW 14-Pin Plastic DIP (derate 10.0mW/°C above +70°C) ...800mW Operating Temperature Ranges MAX307_EE_ _ ......-40°C to +85°C MAX307_EA_ _ ....-40°C to +125°C Junction Temperature ......+150°C Storage Temperature Range .....-65°C to +150°C Lead Temperature (soldering, 10s) .........+300°C
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
(VCC = 3.3V ±10%, TA =TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V and TA = +25°C.) (Note 1)
PARAMETER DRIVER RL = 100 (RS422), Figure 1 Differential Driver Output Change in Magnitude of Differential Output Voltage Driver Common-Mode Output Voltage Change in Magnitude of Common-Mode Voltage Input High Voltage Input Low Voltage Input Hysteresis Input Current Input Impedance First Transition Input Current SRL Input High Voltage SRL Input Middle Voltage SRL Input Low Voltage SRL Input Current Output Leakage (Y and Z) Full Duplex IO SRL = VCC SRL = GND DE = GND, VCC = GND or 3.6V VIN = +12V VIN = -7V -100 -75 125 IIN2 VOD RL = 54 (RS485), Figure 1 No load VOD VOC VOC VIH VIL V HYS IIN1 RL = 100 or 54, Figure 1 (Note 2) RL = 100 or 54, Figure 1 RL = 100 or 54, Figure 1 (Note 2) DE, DI, RE, TXP, RXP, H/F DE, DI, RE, TXP, RXP, H/F DE, DI, RE, TXP, RXP, H/F DE, DI, RE DE TXP, RXP, H/F internal pulldown 1 10 VCC - 0.4 VCC x 0.4 VCC x 0.6 0.4 75 100 ±1 10 40 2 0.8 V CC / 2 2 1.5 VCC VCC VCC 0.2 3 0.2 V V V V V mV µA k µA V V V µA µA V SYMBOL CONDITIONS MIN TYP MAX UNITS
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+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 3.3V ±10%, TA =TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V and TA = +25°C.) (Note 1)
PARAMETER Driver Short-Circuit Output Current Driver Short-Circuit Foldback Output Current Thermal-Shutdown Threshold Thermal-Shutdown Hysteresis Input Current (A and B) RECEIVER Receiver Differential Threshold Voltage Receiver Input Hysteresis RO Output High Voltage RO Output Low Voltage Three-State Output Current at Receiver Receiver Input Resistance Receiver Output Short-Circuit Current SUPPLY CURRENT No load, RE = 0, DE = VCC Supply Current Supply Current in Shutdown Mode ESD PROTECTION ESD Protection for Y, Z, A, and B Human Body Model ±15 kV ICC No load, RE = VCC, DE = VCC No load, RE = 0, DE = 0 ISHDN RE = VCC, DE = GND 0.8 0.8 0.8 0.05 1.5 1.5 1.5 10 µA mA VTH VTH VOH VOL IOZR RIN IOSR -7V VCM 12V VA + VB = 0V IO = -1mA IO = 1mA 0 VO VCC -7V VCM 12V 0V VRO VCC 96 ±80 VCC - 0.6 0.4 ±1 -200 -125 15 -50 mV mV V V µA k mA SYMBOL IOSD IO S D F TTS TTSH IA, B DE = GND, VCC = GND or 3.6 VIN = +12V VIN = -7V -100 CONDITIONS 0 VOUT 12V (Note 3) -7V VOUT VCC (Note 3) (VCC - 1V) VOUT 12V (Note 3) -7V VOUT 1V (Note 3) 175 15 125 MIN 40 -250 20 -20 TYP MAX 250 -40 UNITS mA mA °C °C µA
MAX3070EMAX3079E
Note 1: All currents into the device are positive. All currents out of the device are negative. All voltages are referred to device ground, unless otherwise noted. Note 2: VOD and VOC are the changes in VOD and VOC, respectively, when the DI input changes state. Note 3: The short-circuit output current applies to peak current just prior to foldback current limiting. The short-circuit foldback output current applies during current limiting to allow a recovery from bus contention.
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