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MAX3060E/MAX3061E/MAX3062E

±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-Rate-

Limited RS-485/RS-422 Transceivers in a SOT

________________________________________________________________ Maxim Integrated Products 1

General Description

The MAX3060E/MAX3061E/MAX3062E 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 is a logic high if all

transmitters on a terminated bus are disabled (high

impedance). These devices also feature hot-swap cir-

cuitry that eliminates data glitches during hot insertion.

The MAX3060E features slew-rate-limited drivers that

minimize EMI and reduce reflections caused by

improperly terminated cables, allowing error-free data

transmission up to 115kbps. The MAX3061E, also slew-

rate limited, transmits up to 500kbps. The MAX3062E

driver is not slew-rate limited, allowing transmit speeds

up to 20Mbps. All transmitter outputs are protected to

±15kV using the Human Body Model.

These transceivers typically draw 910µA of supply

current when unloaded, or 790µA 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. These

devices are intended for half-duplex communication.

Applications

RS-422/RS-485 Communications

Level Translators

Transceivers for EMI-Sensitive Applications

Industrial-Control Local-Area Networks

Features

♦ True Fail-Safe Receiver While Maintaining

EIA/TIA-485 Compatibility

♦ Enhanced Slew-Rate Limiting Facilitates

Error-Free Data Transmission (MAX3060E and

MAX3061E)

♦ 1nA Low-Current Shutdown Mode

♦ Hot-Swappable for Telecom Applications

♦ ESD Protection: ±15kV Human Body Model

♦ Allow Up to 256 Transceivers on the Bus

♦ Space-Saving 8-Pin SOT23 Package

19-2536; Rev 1; 7/07

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX3060EEKA-T

-40°C to +85°C 8 SOT23-8

AAKI

MAX3060EEKA#T

-40°C to +85°C 8 SOT23-8

AEPA*

MAX3061EEKA-T

-40°C to +85°C 8 SOT23-8

AAKJ

MAX3061EEKA#T

-40°C to +85°C 8 SOT23-8

AEPB*

MAX3062EEKA-T

-40°C to +85°C 8 SOT23-8

AAKK

MAX3062EEKA#T

-40°C to +85°C 8 SOT23-8

AEPC*

Selector Guide

PART

DATA

RATE

(Mbps)

SLEW-

RATE

LIMITED

TRANSCEIVERS

ON BUS

MAX3060E

0.115 Yes 256

MAX3061E

0.5 Yes 256

MAX3062E

20 No 256

MAX3060E

MAX3061E

MAX3062E

0.1μF

GND

TOP VIEW

+5V

Typical Operating Circuit/Pin Configuration

*Indicates an RoHS-compliant part

T = Tape and Reel

Summary of content (17 pages)

PAGE 1
9-2536; Rev 1; 7/07 ±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT Features The MAX3060E/MAX3061E/MAX3062E high-speed transceivers for RS-485/RS-422 communication contain one driver and one receiver. These devices feature failsafe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means that the receiver output is a logic high if all transmitters on a terminated bus are disabled (high impedance).
PAGE 2
MAX3060E/MAX3061E/MAX3062E ±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT ABSOLUTE MAXIMUM RATINGS All Voltages with Respect to GND Supply Voltage (VCC) ............................................................+7V Input Voltage (RE, DE, DI)..........................-0.3V to (VCC + 0.3V) Driver Output/Receiver Input Voltage (A, B) .......-7.5V to +12.5V Receiver Output Voltage (RO)....................-0.3V to (VCC + 0.
PAGE 3
±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT (VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.
PAGE 4
MAX3060E/MAX3061E/MAX3062E ±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT SWITCHING CHARACTERISTICS—MAX3060E (VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Notes 1, 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS tDPLH, tDPHL Figures 3 and 5, RDIFF = 54Ω, CDIFF = 50pF 1.0 1.7 2.
PAGE 5
±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT MAX3060E/MAX3061E/MAX3062E SWITCHING CHARACTERISTICS—MAX3061E (VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.
PAGE 6
MAX3060E/MAX3061E/MAX3062E ±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT SWITCHING CHARACTERISTICS—MAX3062E (VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.
PAGE 7
±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT MAX3060E/MAX3061E/MAX3062E A R RECEIVER OUTPUT 1kΩ TEST POINT VCC S1 CL 15pF VOD2 R 1kΩ VOC S2 B Figure 2. Receiver Enable/Disable Timing Test Load Figure 1. Driver DC Test Load 5V DE DI A VOD2 RDIFF VCC S1 500Ω OUTPUT UNDER TEST CDIFF B CL S2 Figure 3. Driver Timing Test Circuit Figure 4. Driver Enable/Disable Timing Test Load 5V DI 1.5V 0 5V 1.
PAGE 8
5V RE 1.5V 1.5V 0 RO VOH A -1V B tRLZ tRZL(SHDN), tRZL 1.5V VOL 1V tRPHL VCC RO 1.5V OUTPUT 1.5V OUTPUT NORMALLY LOW VOL + 0.5V tRPLH OUTPUT NORMALLY HIGH INPUT RO VOH - 0.5V 1.5V 0 tRZH(SHDN), tRZH Figure 7. Receiver Propagation Delays tRHZ Figure 8. Receiver Enable and Disable Times B VID ATE RECEIVER OUTPUT RR A Figure 9. Receiver Propagation Delay Test Circuit Typical Operating Characteristics (VCC = +5V, TA = +25°C, unless otherwise noted.
PAGE 9
±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT 3.0 2.5 2.0 1.5 1.0 0.35 0.30 0.25 0.20 IRO = -8mA 4.0 3.8 3.6 3.4 0 3.2 0.10 -40 -15 10 35 60 85 -40 -15 10 35 60 -40 85 -15 10 35 60 TEMPERATURE (°C) TEMPERATURE (°C) RECEIVER PROPAGATION DELAY (MAX3060E/MAX3061E) vs. TEMPERATURE RECEIVER PROPAGATION DELAY (MAX3062E) vs. TEMPERATURE DRIVER PROPAGATION DELAY (MAX3060E) vs. TEMPERATURE 50 45 40 35 CL = 15pF 65 60 55 50 45 40 35 1.
PAGE 10
Typical Operating Characteristics (continued) (VCC = +5V, TA = +25°C, unless otherwise noted.) DRIVER OUTPUT CURRENT vs. OUTPUT LOW VOLTAGE 1 0.1 MAX3060E toc14 120 80 70 DRIVER OUTPUT CURRENT (mA) 10 90 DRIVER OUTPUT CURRENT (mA) MAX3060E toc13 100 DRIVER OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE 60 50 40 30 20 MAX3060E toc15 DRIVER OUTPUT CURRENT vs.
PAGE 11
±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT PIN NAME FUNCTION 1 RO Receiver Output. When RE is low and when A - B ≥ -50mV, RO is high; if A - B ≤ -200mV, RO is low. RO is high impedance when RE is high. 2 RE Receiver Output Enable. Drive RE low to enable RO; RO is high impedance when RE is high. Drive RE high and DE low to enter low-power shutdown mode. RE is a hot-swap input and reverts to a standard CMOS input after the first low transition.
PAGE 12
MAX3060E/MAX3061E/MAX3062E ±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT Functional Tables Table 2. Receiver Functional Table Table 1. Transmitter Functional Table TRANSMITTING RECEIVING INPUTS OUTPUTS INPUTS OUTPUT RO RE DE DI B A RE DE A-B X 1 1 0 1 0 X ≥ -0.05V 1 0 X 1 0 1 0 0 X ≤ -0.2V 0 0 X High-Z High-Z 0 X Open/shorted 1 1 0 X 1 1 X High-Z 1 0 X Shutdown Shutdown* X = Don’t care.
PAGE 13
±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT MAX3060E/MAX3061E/MAX3062E Hot-Swap Line Transient The circuit of Figure 11 shows a typical offset termination used to guarantee a greater than 200mV offset when a line is not driven (the 50pF represents the minimum parasitic capacitance that would exist in a typical application).
PAGE 14
MAX3060E/MAX3061E/MAX3062E ±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT ESD Test Conditions ESD performance depends on a number of conditions. Contact Maxim for a reliability report that documents test setup, methodology, and results. Human Body Model Figure 15a shows the Human Body Model, and Figure 15b shows the current waveform it generates when discharged into a low impedance.
PAGE 15
±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT For example, the MAX3060E’s rise time is typically 1850ns, which results in excellent waveforms with a stub length up to 123ft. A system can work well with longer unterminated stubs, even with severe reflections, if the waveform settles out before the UART samples them. 20dB/div 0 125kHz/div 1.25MHz Figure 17.
PAGE 16
MAX3060E/MAX3061E/MAX3062E ±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT 120Ω 120Ω DI DE B B D D DI DE RO RE A B A B A A R R RO RE R R D D MAX3060E/MAX3061E/ MAX3062E (HALF-DUPLEX) DI DE RO RE DI DE RO RE Figure 20. Typical Half-Duplex RS-485 Network Typical Applications The MAX3060E family of transceivers are designed for bidirectional data communications on multipoint bus transmission lines.
PAGE 17
±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-RateLimited RS-485/RS-422 Transceivers in a SOT SOT23, 8L.EPS MARKING 0 0 PACKAGE OUTLINE, SOT-23, 8L BODY 21-0078 G 1 1 Revision History Pages changed at Rev 1: 1, 16, 17 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.