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Part: MAX3291E
Category:
Interface and Interconnect
Description: RS-485/RS-422 Transceivers With Preemphasis For High-Speed, Long-distance Communication
Company: Maxim Integrated Products
Datasheet: Download MAX3291E datasheet File size : 232 kB
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Datasheet text preview:
19-1405; Rev 1; 4/99
RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication
________________General Description
The MAX3291/MAX3292 high-speed RS-485/RS-422 transceivers feature driver preemphasis circuitry, which extends the distance and increases the data rate of reliable communication by reducing intersymbol interfere n c e (ISI) caused by long cables. The MAX3291 is p r o g r a m m a b l e for data rates of 5Mbps to 10Mbps, while the MAX3292 is programmable for data rates up to 10Mbps by using a single external resistor. The MAX3291/MAX3292 are full-duplex devices that operate from a single +5V supply and offer a low-current shutdown mode that reduces supply current to 100nA. They feature driver output short-circuit current limiting and a fail-safe receiver input that guarantees a logic-high output if the input is open circuit. A 1/4-unitload receiver input impedance allows up to 128 transceivers on the bus.
____________________________Features
o Preemphasis Increases the Distance and Data Rate of Reliable RS-485/RS-422 Communication o Data Rate Optimized for 5Mbps to 10Mbps (MAX3291) Programmable up to 10Mbps (MAX3292) o 100nA Low-Current Shutdown Mode o Allow Up to 128 Transceivers on the Bus o -7V to +12V Common-Mode Input Voltage Range o Pin-Compatible with '75180, MAX489, MAX491 MAX3080, MAX3083, MAX3086, MAX1482
MAX3291/MAX3292
_______________Ordering Information
PART MAX3291CSD TEMP. RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 14 SO 14 Plastic DIP 14 SO 14 Plastic DIP 14 SO 14 Plastic DIP 14 SO 14 Plastic DIP
________________________Applications
Long-Distance, High-Speed RS-485/RS-422 Communications Telecommunications Industrial-Control Local Area Networks
MAX3291CPD MAX3291ESD MAX3291EPD MAX3292CSD MAX3292CPD MAX3292ESD MAX3292EPD
Typical Operating Circuit and Functional Diagram
RPSET* RPSET*
1µF PEE (PSET) CPSET* VCC 14 1 (VCCD) RO RE DE DI 2 3 4 5 Z 10 Y9 R = ZO R = ZO 11 12 B A 13 R = ZO R = ZO 9 10 Y Z A 12 B 11 PEE (PSET) CPSET* VCC 14 1 (VCCD)
1µF
13 5
DI
4 DE 3 RE 2 RO ( ) ARE FOR MAX3292 * MAX3292 ONLY ZO = THE CHARACTERISTIC IMPEDANCE OF THE CABLE
MAX3291 MAX3292
7(6) GND
MAX3291 MAX3292
7(6) GND
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication MAX3291/MAX3292
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC, VCCD) .......+6V Control Input Voltage (RE, DE, PEE, PSET, DI) .......-0.3V to (VCC + 0.3V) Driver Output Voltage (Y, Z) ........-7.5V to +12.5V Receiver Input Voltage (A, B)......-7.5V to +12.5V Receiver Output Voltage (RO)...........-0.3V to (VCC + 0.3V) Continuous Power Dissipation (TA = +70°C) 14-Pin SO (derate 8.7mW/°C above +70°C)........695mW 14-Pin Plastic DIP (derate 10.0mW/°C above +70°C) ..800mW Operating Temperature Ranges MAX329_C_ D......0°C to +70°C MAX329_E_ D .........-40°C to +85°C Storage Temperature Range .....-65°C to +160°C Lead Temperature (soldering, 10sec) .....+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
(Typical Operating Circuit, VCC = +5V ±5%, RPSET = 0 (MAX3292), VCC = VCCD (MAX3292), TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) PARAMETER DRIVER Differential Driver Output Differential Driver Output with Preemphasis Differential Driver Preemphasis Ratio Change in Magnitude of Differential Output Voltage (Normal and Preemphasis) Driver Common-Mode Output Voltage (Normal and Preemphasis) Change in Magnitude of Common-Mode Voltage (Normal and Preemphasis) Change in Magnitude of Common-Mode Output Voltage (Normal to Preemphasis) Input High Voltage Input Low Voltage Input Current PEE Input Current (MAX3291) PSET Input Current (MAX3292) Output Leakage (Y and Z) Driver Short-Circuit Output Current 2 VOD VODP DPER VOD, VODP Figure 1 R = 27 Figure 1, R = 27 (Note 3) R = 27 No load (Note 2) 2.4 1.65 2.0 2.35 1.5 5.0 5.25 V V V SYMBOL CONDITIONS MIN TYP MAX UNITS
Figure 1, R = 27 (Note 4)
0.2
V
VOC
Figure 1, R = 27
VCC / 2
3
V
VOC
Figure 1, R = 27 (Note 5)
0.3
V
VNP
Figure 1, R = 27 DE, DI, RE PEE DE, DI, RE, PEE DE, DI, RE -15 VPSET = VCC DE = GND, VCC = GND or 5.25V VY = VZ = +12V VY = VZ = -7V ±30
50
mV
VIH VIL IIN IPEE IPSET IO IOSD
2.4 3.75 0.8 ±2 -30 70 -45 110 25 -25 ±250
V V µA µA µA µA mA
-7V VOUT +12V (Note 6)
_______________________________________________________________________________________
RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication MAX3291/MAX3292
DC ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, VCC = +5V ±5%, RPSET = 0 (MAX3292), VCC = VCCD (MAX3292), TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) PARAMETER RECEIVER Input Current (A and B) Receiver Differential Threshold Voltage Receiver Input Hysteresis Receiver Output High Voltage Receiver Output Low Voltage Three-State Output Current at Receiver Receiver Input Resistance Receiver Output Short-Circuit Current SUPPLY CURRENT No-Load Supply Current Supply Current in Shutdown Mode ICC + ICCD RE = GND, DE = VCC ISHDN RE = VCC, DE = GND, VY = VZ = 0 to VCC or floating 2.0 0.1 3.0 1 mA µA IA, B VTH VTH VOH VOL IOZR RIN IOSR DE = GND, VCC = GND or 5.25V -7V VCM +12V VA = VB = 0 IO = -4mA, VA - VB = VTH IO = 4mA, VA - VB = -VTH 0 VO VCC -7V VCM +12V 0 VRO VCC 48 ±15 ±95 0.1 3.5 0.4 ±1 VIN = +12V VIN = -7V -200 35 250 -150 200 µA mV mV V V µA k mA SYMBOL CONDITIONS MIN TYP MAX UNITS
SWITCHING CHARACTERISTICS
(Typical Operating Circuit, VCC = +5V ±5%, RPSET = 0 (MAX3292), VCC = VCCD (MAX3292), TA = +25°C, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) PARAMETER Driver Propagation Delay Driver Differential Output Rise or Fall Time SYMBOL tDPLH tDPHL tHL tLH CONDITIONS Figures 3 and 5, RDIFF = 54, CL1 = CL2 = 50pF Figures 3 and 5, RDIFF = 54, CL1 = CL2 = 50pF Figures 3 and 10, RDIFF = 54, CL1 = CL2 = 50pF MAX3291/MAX3292, RPSET = 0 MAX3292, RPSET = 523k 80 0.75 MIN TYP 41 44 12 100 1 30 3 10 8 120 1.25 MAX 65 65 UNITS ns ns ns µs ns ns Mbps
Driver Preemphasis Interval
tPRE
Preemphasis Voltage Level to Normal Voltage Level Delay Differential Driver Output Skew tDPLH - tDPHL Maximum Data Rate
tPTND tDSKEW fMAX
Figures 3 and 10, RDIFF = 54, CL1 = CL2 = 50pF Figures 3 and 5, RDIFF = 54, CL1 = CL2 = 50pF
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