Datasheet

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AVAILABLE

EVALUATION KIT 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 MAX3080–MAX3089 high-speed transceivers for

RS-485/RS-422 communication contain one driver and

one receiver. These devices feature fail-safe circuitry,

which guarantees a logic-high receiver output when the

receiver inputs are open or shorted. This means that

the receiver output will be a logic high if all transmitters

on a terminated bus are disabled (high impedance).

The MAX3080/MAX3081/MAX3082 feature reduced

slew-rate drivers that minimize EMI and reduce reflec-

tions caused by improperly terminated cables, allowing

error-free data transmission up to 115kbps. The

MAX3083/MAX3084/MAX3085 offer higher driver out-

put slew-rate limits, allowing transmit speeds up to

500kbps. The MAX3086/MAX3087/MAX3088’s driver

slew rates are not limited, making transmit speeds up

to 10Mbps possible. The MAX3089’s slew rate is

selectable between 115kbps, 500kbps, and 10Mbps

by driving a selector pin with a single three-state driver.

These transceivers typically draw 375µA of supply

current when unloaded, or when fully loaded with the

drivers disabled.

All devices have a 1/8-unit-load receiver input imped-

ance that allows up to 256 transceivers on the bus. The

MAX3082/MAX3085/MAX3088 are intended for half-

duplex communications, while the MAX3080/MAX3081/

MAX3083/MAX3084/MAX3086/MAX3087 are intended

for full-duplex communications. The MAX3089 is selec-

table between half-duplex and full-duplex operation. It

also features independently programmable receiver

and transmitter output phase via separate pins.

Next Generation Device Features

♦ For Fault-Tolerant Applications:

MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4-

Unit Load, +3.3V RS-485 Transceiver

♦ For Low-Voltage Applications:

MAX3362: +3.3V, High-Speed, RS-485/RS-422

Transceiver in a SOT23 Package

♦ For Multiple Transceiver Applications:

MAX3030E–MAX3033E: ±15kV ESD-Protected,

+3.3V, Quad, RS-422 Transmitters

MAX3040–MAX3045: ±10kV ESD-Protected, Quad,

+5V, RS-485/RS-422 Transmitters

Applications

RS-422/RS-485 Communications

Level Translators

Transceivers for EMI-Sensitive Applications

Industrial-Control Local Area Networks

Fail-Safe, High-Speed (10Mbps),

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

19-1138; Rev 3; 12/05

Selection Table

*Pin-compatible with 75180, with additional features implemented using pins 1, 6, 8, and 13.

Ordering Information continued at end of data sheet.

Ordering Information

PART

MAX3080CSD

MAX3080CPD

MAX3080ESD -40°C to +85°C

0°C to +70°C

TEMP RANGE PIN-PACKAGE

14 SO

14 Plastic DIP

14 SO

MAX3080EPD -40°C to +85°C 14 Plastic DIP

Part

Half/Full

Duplex

Data

Rate

(Mbps)

Slew

Rate

Limited

Low-

Power

Shutdown

Receiver/

Driver

Enable

Quiescent

Current

(µA)

Transceivers

Bus

Count

Industry-

Standard

Pinout

MAX3080

Full 0.115 Yes Yes Yes 375 256 14 75180

MAX3081

Full 0.115 Yes No No 375 256 8 75179

MAX3082

Half 0.115 Yes Yes Yes 375 256 8 75176

MAX3083

Full 0.5 Yes Yes Yes 375 256 14 75180

MAX3084

Full 0.5 Yes No No 375 256 8 75179

MAX3085

Half 0.5 Yes Yes Yes 375 256 8 75176

MAX3086

Full 10 No Yes Yes 375 256 14 75180

MAX3087

Full 10 No No No 375 256 8 75179

MAX3088

Half 10 No Yes Yes 375 256 8 75176

MAX3089

Selectable Selectable Selectable

Yes Yes 375 256 14 75180*

MAX3080–MAX3089

Summary of content (21 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers LE AVAILAB General Description The MAX3080–MAX3089 high-speed transceivers for RS-485/RS-422 communication contain one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted.
PAGE 2
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC) ............................................................+7V Control Input Voltage (RE, DE)...................-0.3V to (VCC + 0.3V) Special Input Voltage (H/F, SRL, TXP, RXP)..................................-0.3V to (VCC + 0.3V) Driver Input Voltage (DI).............................-0.3V to (VCC + 0.3V) Driver Output Voltage (A, B, Y, Z)..............................
PAGE 3
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers DC ELECTRICAL CHARACTERISTICS (continued) (VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS -200 -125 -50 mV 0.
PAGE 4
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers SWITCHING CHARACTERISTICS—MAX3080–MAX3082, and MAX3089 with SRL = Unconnected (VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.
PAGE 5
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers SWITCHING CHARACTERISTICS—MAX3083–MAX3085, and MAX3089 with SRL = VCC (VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.
PAGE 6
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers SWITCHING CHARACTERISTICS—MAX3086–MAX3088, and MAX3089 with SRL = GND (VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.
PAGE 7
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers Typical Operating Characteristics (VCC = +5V, TA = +25°C, unless otherwise noted.) A DE = GND B 375 A B: MAX3080–MAX3085, MAX3089 WITH SRL = OPEN OR VCC B 325 10 300 0 20 40 60 80 100 MAX3080/3089 TOC-3 10 0 0 3 2 1 5 4 0 3 2 1 5 4 TEMPERATURE (°C) OUTPUT LOW VOLTAGE (V) OUTPUT HIGH VOLTAGE (V) SHUTDOWN CURRENT vs. TEMPERATURE RECEIVER OUTPUT LOW VOLTAGE vs.
PAGE 8
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers Typical Operating Characteristics (continued) (VCC = +5V, TA = +25°C, unless otherwise noted.) 720 680 640 600 55 50 45 40 35 30 -60 -40 -20 0 20 40 60 80 100 DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE 1.86 1.85 40 60 80 -60 -40 -20 100 0 40 20 60 80 TEMPERATURE (°C) TEMPERATURE (°C) OUTPUT CURRENT vs. DRIVER OUTPUT LOW VOLTAGE OUTPUT CURRENT vs.
PAGE 9
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers Typical Operating Characteristics (continued) (VCC = +5V, TA = +25°C, unless otherwise noted.
PAGE 10
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers Pin Description PIN PIN MAX3080 MAX3081 MAX3082 MAX3083 MAX3084 MAX3085 MAX3086 MAX3087 MAX3088 FULL-DUPLEX DEVICES 10 MAX3089 HALFFULLDUPLEX DUPLEX DEVICES MODE NAME FUNCTION HALFDUPLEX MODE — — — 1 1 H/F Half/Full-Duplex Selector Pin. Connect H/F to VCC for half-duplex mode; connect to GND or leave unconnected for full-duplex mode. 2 2 1 2 2 RO Receiver Output.
PAGE 11
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers Pin Description (continued) PIN MAX3080 MAX3081 MAX3082 MAX3083 MAX3084 MAX3085 MAX3086 MAX3087 MAX3088 MAX3089 NAME HALFFULLDUPLEX DUPLEX DEVICES MODE FULL-DUPLEX DEVICES FUNCTION HALFDUPLEX MODE 12 8 — 12 — A Noninverting Receiver Input — — — — 12 A Receiver Input Resistors* — — 6 — — A Noninverting Receiver Input and Noninverting Driver Output — — — 13 13 RXP Receiver Phase.
PAGE 12
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers Function Tables (continued) MAX3082/MAX3085/MAX3088 MAX3089 TRANSMITTING TRANSMITTING INPUTS INPUTS OUTPUTS OUTPUTS RE DE DI B/Z A/Y TXP RE DE DI Z Y X 1 1 0 1 0 X 1 1 0 1 X 1 0 1 0 0 X 1 0 1 0 0 0 X High-Z High-Z 1 X 1 1 1 0 1 0 X 1 X 1 0 0 1 X 0 0 X High-Z High-Z X 1 0 X Shutdown Shutdown RECEIVING INPUTS 12 OUTPUT RE DE A-B RO 0 X ≥ -
PAGE 13
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers VCC DE TOP VIEW TOP VIEW 4 N.C. 1 14 VCC R RO 2 RE 3 12 A DE 4 11 B 5 10 Z DI 13 N.C. D GND 6 GND 7 9 Y 8 N.C. VCC RE 0.1µF 14 9 5 DI Y MAX3080 MAX3083 MAX3086 Rt D RO R 10 Z 12 2 RO R A Rt D 11 DI B NC 1, 8, 13 3 DIP/SO 6, 7 GND GND RE DE Figure 1. MAX3080/MAX3083/MAX3086 Pin Configuration and Typical Full-Duplex Operating Circuit TOP VIEW 0.
PAGE 14
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers Detailed Description The MAX3080–MAX3089 high-speed transceivers for RS-485/RS-422 communication contain one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled (see Fail-Safe section).
PAGE 15
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers Y TEST POINT RECEIVER OUTPUT CRL 15pF R VOD R 1kΩ VCC S1 1kΩ VOC S2 Z Figure 5. Driver DC Test Load Figure 6. Receiver Enable/Disable Timing Test Load Fail-Safe The MAX3080 family guarantees a logic-high receiver output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled.
PAGE 16
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers 3V DE DI CL1 Y 500Ω RDIFF OUTPUT UNDER TEST VID Z CL CL2 S2 Figure 7. Driver Timing Test Circuit Figure 8. Driver Enable/Disable Timing Test Load 3V 3V DI 1.5V 0V DE 1.5V 1.5V 1.5V 0V tPHL tPLH 1/2 VO tZL(SHDN), tZL tLZ Y, Z Z VO 2.3V OUTPUT NORMALLY LOW VOL Y 1/2 VO VO VDIFF 0V -VO VCC S1 10% VDIFF = V (Y) - V (Z) VOH -0.5V 2.3V 90% tR OUTPUT NORMALLY HIGH Y, Z 90% VOL +0.
PAGE 17
MAX3080/3089 FIG-14 MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers B ATE VID RECEIVER OUTPUT RR 20dB/div A 0Hz MAX3080/3089 FIG-16 A B 20dB/div 0Hz 100kHz/div 1MHz Figure 14. Driver Output Waveform and FFT Plot of MAX3086/MAX3087/MAX3088, and MAX3089 with SRL = GND, Transmitting a 20kHz Signal MAX3080/3089 FIG-15 Figure 13. Receiver Propagation Delay Test Circuit 100kHz/div 1MHz A B 20dB/div 0Hz 100kHz/div 1MHz Figure 15.
PAGE 18
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers MAX3080/3089 FIG-18 MAX3080/MAX3081/MAX3083/ MAX3084/MAX3086/MAX3087/ MAX3089 (FULL DUPLEX) DI 5V/div VA - VB 1V/div RO 5V/div A RO RE R 120Ω B DATA IN DE Z DI D 120Ω Y DATA OUT 5µs/div NOTE: RE AND DE ON MAX3080/MAX3083/MAX3086/MAX3089 ONLY. Figure 17.
PAGE 19
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers MAX3080/3089 FIG-19 MAX3080/3089 FIG-20 DI 5V/div DI 5V/div VA - VB 1V/div VA - VB 1V/div RO 5V/div RO 5V/div 2µs/div 1µs/div Figure 19. MAX3083/MAX3084/MAX3085, and MAX3089 with SRL = VCC, System Differential Voltage at 50kHz Driving 4000 feet of Cable Figure 20.
PAGE 20
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers A Y 120Ω R RO RE 120Ω D B Z Z B DE DI DE DI 120Ω D Y 120Ω Z Y B A Y Z R A R A R D D DI B RE RO DE RE RO DI NOTE: RE AND DE ON MAX3080/MAX3083/MAX3086/MAX3089 ONLY. DE RE RO MAX3080 MAX3081 MAX3083 MAX3084 MAX3086 MAX3087 MAX3089 (FULL-DUPLEX) Figure 22.
PAGE 21
MAX3080–MAX3089 Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited 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.