Datasheet

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General Description

Devices in the MAX3483E family (MAX3483E/MAX3485E/

MAX3486E/MAX3488E/MAX3490E/MAX3491E) are

±15kV ESD-protected, +3.3V, low-power transceivers for

RS-485 and RS-422 communications. Each device con-

tains one driver and one receiver. The MAX3483E and

MAX3488E feature slew-rate-limited drivers that minimize

EMI and reduce reflections caused by improperly termi-

nated cables, allowing error-free data transmission at

data rates up to 250kbps. The partially slew-rate-limited

MAX3486E transmits up to 2.5Mbps. The MAX3485E,

MAX3490E, and MAX3491E transmit at up to 12Mbps.

All devices feature enhanced electrostatic discharge

(ESD) protection. All transmitter outputs and receiver

inputs are protected to ±15kV using IEC 1000-4-2 Air-

Gap Discharge, ±8kV using IEC 1000-4-2 Contact

Discharge, and ±15kV using the Human Body Model.

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 MAX3488E, MAX3490E, and MAX3491E feature

full-duplex communication, while the MAX3483E,

MAX3485E, and MAX3486E are designed for half-

duplex communication.

Applications

Telecommunications

Industrial-Control Local Area Networks

Transceivers for EMI-Sensitive Applications

Integrated Services Digital Networks

Packet Switching

Features

♦ ESD Protection for RS-485 I/O Pins

±15kV—Human Body Model

±8kV—IEC 1000-4-2, Contact Discharge

±15kV—IEC 1000-4-2, Air-Gap Discharge

♦ Operate from a Single +3.3V Supply—

No Charge Pump Required

♦ Interoperable with +5V Logic

♦ Guaranteed 12Mbps Data Rate

(MAX3485E/MAX3490E/MAX3491E)

♦ Slew-Rate Limited for Errorless Data Transmission

(MAX3483E/MAX3488E)

♦ 2nA Low-Current Shutdown Mode

(MAX3483E/MAX3485E/MAX3486E/MAX3491E)

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

♦ Full-Duplex and Half-Duplex Versions Available

♦ Industry-Standard 75176 Pinout

(MAX3483E/MAX3485E/MAX3486E)

♦ Current-Limiting and Thermal Shutdown for

Driver Overload Protection

MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected, 12Mbps and

Slew-Rate-Limited True RS-485/RS-422 Transceivers

________________________________________________________________

Maxim Integrated Products

19-1474; Rev 0; 4/99

PART

MAX3483ECSA

MAX3483ECPA 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

8 SO

8 Plastic DIP

PART

NUMBER

GUARANTEED

DATA RATE

(Mbps)

SUPPLY

VOLTAGE

(V)

HALF/FULL

DUPLEX

SLEW-RATE

LIMITED

DRIVER/

RECEIVER

ENABLE

SHUTDOWN

CURRENT

(nA)

COUNT

MAX3483E 0.25 Half Yes Yes 2 8

MAX3485E 12 Half No Yes 2 8

MAX3486E 2.5 Half Yes Yes 2 8

MAX3488E 0.25 Full Yes No — 8

MAX3490E 12 Full No No — 8

MAX3491E 12

3.0 to 3.6

Full No Yes 2 14

Selector Guide

MAX3483EESA

MAX3483EEPA -40°C to +85°C

-40°C to +85°C 8 SO

8 Plastic DIP

MAX3485ECSA

MAX3485ECPA 0°C to +70°C

0°C to +70°C 8 SO

8 Plastic DIP

MAX3485EESA

MAX3485EEPA -40°C to +85°C

-40°C to +85°C 8 SO

8 Plastic DIP

Ordering Information

Ordering Information continued at end of data sheet.

±15kV

ESD

PROTECTION

Yes

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.

Summary of content (16 pages)

PAGE 1
9-1474; Rev 0; 4/99 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Devices in the MAX3483E family (MAX3483E/MAX3485E/ MAX3486E/MAX3488E/MAX3490E/MAX3491E) are ±15kV ESD-protected, +3.3V, low-power transceivers for RS-485 and RS-422 communications. Each device contains one driver and one receiver.
PAGE 2
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps 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.
PAGE 3
.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E DC ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.3V ±0.3V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers DRIVER SWITCHING CHARACTERISTICS—MAX3483E/MAX3488E (VCC = +3.3V, TA = +25°C.
PAGE 5
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers -18 OUTPUT CURRENT (mA) 15 10 3.30 -14 -12 -10 -8 -6 -4 5 IRO = 1.5mA 3.25 OUTPUT HIGH VOLTAGE (V) -16 20 OUTPUT CURRENT (mA) RECEIVER OUTPUT HIGH VOLTAGE vs. TEMPERATURE MAX3483E-02 -20 MAX3483E-01 25 OUTPUT CURRENT vs. RECEIVER OUTPUT HIGH VOLTAGE MAX3483E-03 OUTPUT CURRENT vs. RECEIVER OUTPUT LOW VOLTAGE 3.20 3.15 3.10 3.05 -2 0 0.5 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 3.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +3.3V, TA = +25°C, unless otherwise noted.) SHUTDOWN CURRENT vs. TEMPERATURE SUPPLY CURRENT vs. TEMPERATURE X = DON’T CARE 90 SHUTDOWN CURRENT (nA) 1.1 DE = VCC, RE = X 1.0 MAX3483E-10 100 MAX3483E-09 1.2 SUPPLY CURRENT (mA) MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers DE = 0, RE = 0 0.9 80 70 60 50 40 30 20 0.8 10 0.
PAGE 7
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E TOP VIEW R 1 8 VCC RO RE 2 7 B RE 2 DE 3 6 A DE 3 5 GND DI 4 RO 1 DI 4 D R 8 VCC 7 B Rt 6 A 5 GND D DE MAX3483E MAX3485E MAX3486E D DI B Rt A RO R RE SO/DIP 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
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 375Ω RL 2 VOD D D RL VCC 2 VOC VCC Figure 4. Driver VOD and VOC VID VCM = -7V to +12V RL VOD 375Ω Figure 5. Driver VOD with Varying Common-Mode Voltage R 0 VOL IOL (+) VOH IOH (-) Figure 6. Receiver VOH and VOL 3V IN 1.5V 1.5V CL D GENERATOR (NOTE 4) 0 RL = 60Ω OUT tDD tDD ≈ 2.
PAGE 9
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E 3V VOM IN 1.5V 1.5V RL = 27Ω 0V S1 GENERATOR (NOTE 4) tPLH OUT D 50Ω CL = 15pF (NOTE 5) VCC tPHL VOH Y OUT VOM VOM VOL VOM = VOH + VOL 2 tPHL ≈ 1.5V tPLH VOH Z OUT VOM VOM VOL Figure 8. Driver Propagation Times 3V S1 0 OR 3V OUT D IN 1.5V 1.5V 0 GENERATOR (NOTE 4) RL = 110Ω CL = 50pF (NOTE 5) tPZH tPHZ 50Ω 0.
PAGE 10
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 3.0V GENERATOR (NOTE 4) VID OUT R IN 50Ω 1.5V 1.5V CL = 15pF (NOTE 5) 0 tRPLH tRPHL VCC 1.5V VOM = 0 VOM OUT VCC 2 VOM 0 Figure 11. Receiver Propagation Delay S1 S3 1.5V VCC 1k -1.5V VID R S2 CL (NOTE 5) GENERATOR (NOTE 4) 50Ω 3V IN 1.5V 0 3V S1 OPEN S2 CLOSED S3 = 1.5V IN 1.5V 0 tPRZH tPRSH tPRZL tPRSL VOH OUT VCC OUT 1.
PAGE 11
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers ___________Applications Information Devices with Receiver/Driver Enable (MAX3483E/MAX3485E/MAX3486E/MAX3491E) The MAX3483E/MAX3485E/MAX3486E/MAX3488E/ MAX3490E/MAX3491E are low-power transceivers for RS-485 and RS-422 communications. The MAX3483E and MAX3488E can transmit and receive at data rates up to 250kbps, the MAX3486E at up to 2.5Mbps, and the MAX3485E/MAX3490E/MAX3491E at up to 12Mbps.
PAGE 12
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps 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 Figure 15. MAX3485E/MAX3490E/MAX3491E Driver Propagation Delay 20ns/div Figure 16. MAX3485E/MAX3490E/MAX3491E 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
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX3483E family of devices have extra protection against static electricity.
PAGE 14
RC 1M CHARGE-CURRENT LIMIT RESISTOR RD 1500Ω IP 100% 90% DISCHARGE RESISTANCE Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES HIGHVOLTAGE DC SOURCE Cs 100pF STORAGE CAPACITOR DEVICE UNDER TEST 36.8% 10% 0 0 tDL CURRENT WAVEFORM Figure 22b. Human Body Current Waveform Figure 22a.
PAGE 15
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers DI MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E 120Ω 120Ω DE B B D D DI DE B A A B A A R R RO RE RO RE R R D D MAX3483E MAX3485E MAX3486E DE DI RO RE DI RO RE DE Figure 24.
PAGE 16
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Ordering Information (continued) PART TEMP.