Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - transceivers RS422, RS485 1/1 SOIC 8 N

AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

_______________General Description

The MAX3483, MAX3485, MAX3486, MAX3488,

MAX3490, and MAX3491 are 3.3V, low-power trans-

ceivers for RS-485 and RS-422 communication. Each

part contains one driver and one receiver. The

MAX3483 and MAX3488 feature slew-rate-limited dri-

vers that minimize EMI and reduce reflections caused

by improperly terminated cables, allowing error-free

data transmission at data rates up to 250kbps. The par-

tially slew-rate-limited MAX3486 transmits up to

2.5Mbps. The MAX3485, MAX3490, and MAX3491

transmit at up to 10Mbps.

Drivers are short-circuit current limited and are protect-

ed 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 output if both

inputs are open circuit.

The MAX3488, MAX3490, and MAX3491 feature full-

duplex communication, while the MAX3483, MAX3485,

and MAX3486 are designed for half-duplex communi-

cation.

________________________Applications

Low-Power RS-485/RS-422 Transceivers

Telecommunications

Transceivers for EMI-Sensitive Applications

Industrial-Control Local Area Networks

____________________________Features

♦ Operate from a Single 3.3V Supply—

No Charge Pump!

♦ Interoperable with +5V Logic

♦ 8ns Max Skew (MAX3485/MAX3490/MAX3491)

♦ Slew-Rate Limited for Errorless Data Transmission

(MAX3483/MAX3488)

♦ 2nA Low-Current Shutdown Mode

(MAX3483/MAX3485/MAX3486/MAX3491)

♦ -7V to +12V Common-Mode Input Voltage Range

♦ Allows up to 32 Transceivers on the Bus

♦ Full-Duplex and Half-Duplex Versions Available

♦ Industry Standard 75176 Pinout

(MAX3483/MAX3485/MAX3486)

♦ Current-Limiting and Thermal Shutdown for

Driver Overload Protection

______________Ordering Information

Ordering Information continued at end of data sheet.

* Contact factory for for dice specifications.

3.3V-Powered, 10Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

19-0333; Rev 0; 12/94

PART

MAX3483CPA

MAX3483CSA

MAX3483C/D 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

8 Plastic DIP

8 SO

Dice*

PART

NUMBER

GUARANTEED

DATA RATE

(Mbps)

SUPPLY

VOLTAGE

(V)

HALF/FULL

DUPLEX

SLEW-RATE

LIMITED

DRIVER/

RECEIVER

ENABLE

SHUTDOWN

CURRENT

(nA)

COUNT

MAX3483

0.25 Half Yes Yes 2 8

MAX3485

10 Half No Yes 2 8

MAX3486

2.5 Half Yes Yes 2 8

MAX3488

0.25 Full Yes No — 8

MAX3490

10 Full No No — 8

MAX3491

3.0 to 3.6

Full No Yes 2 14

______________________________________________________________Selection Table

MAX3483EPA

MAX3483ESA -40°C to +85°C

-40°C to +85°C 8 Plastic DIP

8 SO

MAX3485CPA

MAX3485CSA

MAX3485C/D 0°C to +70°C

0°C to +70°C

0°C to +70°C 8 Plastic DIP

8 SO

Dice*

MAX3485EPA

MAX3485ESA -40°C to +85°C

-40°C to +85°C 8 Plastic DIP

8 SO

MAX3483/MAX3485/MAX3486/

MAX3488/MAX3490/MAX3491

Summary of content (17 pages)

PAGE 1
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 LE AVAILAB 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers _______________General Description The MAX3483, MAX3485, MAX3486, MAX3488, MAX3490, and MAX3491 are 3.3V, low-power transceivers for RS-485 and RS-422 communication. Each part contains one driver and one receiver.
PAGE 2
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC) ...............................................................7V Control Input Voltage (RE, DE) ...................................-0.3V to 7V Driver Input Voltage (DI) .............................................-0.3V to 7V Driver Output Voltage (A, B, Y, Z)..........................-7.5V to 12.5V Receiver Input Voltage (A, B) ........
PAGE 3
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers DC ELECTRICAL CHARACTERISTICS (continued) (VCC = 3.3V ±0.3V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C) PARAMETER Supply Current SYMBOL ICC Supply Current in Shutdown Mode ISHDN Driver Short-Circuit Output Current IOSD Receiver Short-Circuit Output Current IOSR CONDITIONS No load, DI = 0V or VCC MIN TYP MAX DE = VCC, RE = 0V or VCC 1.
PAGE 4
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers DRIVER SWITCHING CHARACTERISTICS—MAX3483 and MAX3488 (VCC = 3.
PAGE 5
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers __________________________________________Typical Operating Characteristics (VCC = 3.3V, TA = +25°C, unless otherwise noted.) -18 10 -14 -12 -10 -8 -6 -4 5 1.0 1.5 2.0 3.0 0 3.5 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT HIGH VOLTAGE (V) RECEIVER OUTPUT LOW VOLTAGE vs. TEMPERATURE DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE 100 90 OUTPUT CURRENT (mA) 0.7 0.6 0.
PAGE 6
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers _____________________________Typical Operating Characteristics (continued) SHUTDOWN CURRENT vs. TEMPERATURE SUPPLY CURRENT vs. TEMPERATURE 90 1.1 DE = VCC, RE = X 1.0 DE = 0, RE = 0 0.9 MAX3483-10 100 MAX3483-09 X = DON’T CARE SHUTDOWN CURRENT (nA) SUPPLY CURRENT (mA) 1.2 0.8 80 70 60 50 40 30 20 10 0.
PAGE 7
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers TOP VIEW RO 1 RE 2 DE 3 DI 4 R D 1 VCC RO 7 B RE 2 6 A DE 3 5 GND DI 4 8 R MAX3483 MAX3485 MAX3486 8 VCC 7 B Rt 6 A 5 GND D DE D B DI Rt A RO R DIP/SO RE NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH. Figure 1.
PAGE 8
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 375Ω RL 2 VCM = -7V to +12V VOD D D RL 2 VCC VOD RL VOC VCC Figure 4. Driver VOD and VOC VID 375Ω Figure 5. Driver VOD with Varying Common-Mode Voltage R 0V VOL IOL (+) VOH IOH (-) Figure 6. Receiver VOH and VOL 3V IN 1.5V 1.5V CL D GENERATOR (NOTE 4) 0V RL = 60Ω OUT tDO 50Ω VCC OUT CL CL = 15pF (NOTE 5) 50% 10% tTD tDO 90% ≈ 90% 50% 10% 2.0V ≈ -2.
PAGE 9
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 3V VOM IN 1.5V 1.5V RL = 27Ω 0V S1 GENERATOR (NOTE 4) tPLH OUT D 50Ω CL = 15pF (NOTE 5) VCC VOM = VOH + VOL 2 tPHL VOH Y OUT VOM VOM VOL tPHL ≈ 1.5V tPLH VOH Z OUT VOM VOM VOL Figure 8. Driver Propagation Times 3V S1 0V OR 3V GENERATOR (NOTE 4) OUT D IN 0V RL = 110Ω CL = 50pF (NOTE 5) 1.5V 1.5V tPZH tPHZ 50Ω 0.
PAGE 10
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 3.0V GENERATOR (NOTE 4) VID OUT R 50Ω IN CL = 15pF (NOTE 5) 1.5V 1.5V 0V tRPLH tRPHL VCC 1.5V VOM = 0V VOM OUT VCC 2 VOM 0V Figure 11. Receiver Propagation Delay S1 S3 1.5V 1k -1.5V VID VCC R S2 CL (NOTE 5) GENERATOR (NOTE 4) 50Ω 3V IN 1.5V 0V 3V S1 OPEN S2 CLOSED S3 = 1.5V IN 0V tPRZH tPRSH tPRZL tPRSL VOH OUT VCC OUT 1.5V 1.
PAGE 11
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers ____________________Function Tables Devices with Receiver/Driver Enable (MAX3483/MAX3485/MAX3486/MAX3491) Table 1. Transmitting INPUTS OUTPUTS RE DE DI B* A* X 1 0 1 0 X 1 0 1 0 1 0 X 0 High-Z X High-Z MODE 1 Normal High-Z Normal High-Z Normal Shutdown * B and A outputs are Z and Y, respectively, for full-duplex part (MAX3491).
PAGE 12
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers B 1V/div DI 2V/div A 1V/div Z 1V/div RO 2V/div Y 1V/div 20ns/div 20ns/div Figure 15. MAX3485/MAX3490/MAX3491 Driver Propagation Delay Figure 16. MAX3485/MAX3490/MAX3491 Receiver Propagation Delay Driven by External RS-485 Device B 1V/div DI 2V/div A 1V/div Z 1V/div Y 1V/div RO 2V/div 1µs/div 1µs/div Figure 17.
PAGE 13
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 120Ω 120Ω DI DE B B D D DI DE A B A B A A R R RO RE RO RE R MAX3483 MAX3485 MAX3486 R D D DI DE RO RE DI DE RO RE Figure 21. MAX3483/MAX3485/MAX3486 Typical RS-485 Network Driver Output Protection Excessive output current and power dissipation caused by faults or by bus contention are prevented by two mechanisms.
PAGE 14
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers A R RO RE Y 120Ω 120Ω Z Z B DE 120Ω D DI D B Y 120Ω Z Y B A Y Z R A DE RE RO DE R RE RO A R D D DI B DI DI DE RE RO MAX3488 MAX3490 MAX3491 NOTE: RE AND DE ON MAX3491 ONLY. Figure 22.
PAGE 15
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers _Ordering Information (continued) PART MAX3486CPA MAX3486CSA MAX3486C/D MAX3486EPA MAX3486ESA MAX3488CPA MAX3488CSA MAX3488C/D MAX3488EPA MAX3488ESA MAX3490CPA MAX3490CSA MAX3490C/D MAX3490EPA MAX3490ESA MAX3491CPD MAX3491CSD MAX3491C/D MAX3491EPD MAX3491ESD TEMP.
PAGE 16
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers ________________________________________________________Package Information DIM D 0°-8° A 0.101mm 0.004in. e B A1 C E L SO SMALL OUTLINE PACKAGE (0.150 in.) H D L A1 B1 B A A1 A2 A3 B B1 C D1 E E1 e eA eB L C eA eB Plastic DIP PLASTIC DUAL-IN-LINE PACKAGE (0.300 in.) 8 14 16 MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 3.80 4.00 1.27 5.80 6.20 0.40 1.
PAGE 17
MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed.