Rainbow-electronics MAX3079E User Manual

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General Description
The MAX3070E–MAX3079E 3.3V, ±15kV ESD-protected,
RS-485/RS-422 transceivers feature one driver and one
receiver. These devices include fail-safe circuitry, guar-
anteeing a logic-high receiver output when receiver
inputs are open or shorted. The receiver outputs a logic
high if all transmitters on a terminated bus are disabled
(high impedance). The MAX3070E–MAX3079E include a
hot-swap capability to eliminate false transitions on the
bus during power-up or hot insertion.
The MAX3070E/MAX3071E/MAX3072E feature reduced
slew-rate drivers that minimize EMI and reduce reflec-
tions caused by improperly terminated cables, allowing
error-free data transmission up to 250kbps. The
MAX3073E/MAX3074E/MAX3075E also feature slew-
rate-limited drivers but allow transmit speeds up to
500kbps. The MAX3076E/MAX3077E/MAX3078E driver
slew rates are not limited, making transmit speeds up to
16Mbps possible. The MAX3079E slew rate is pin
selectable for 250kbps, 500kbps, and 16Mbps.
The MAX3072E/MAX3075E/MAX3078E are intended for
half-duplex communications, and the MAX3070E/
MAX3071E/MAX3073E/MAX3074E/MAX3076E/MAX307
7E are intended for full-duplex communications. The
MAX3079E is selectable for half-duplex or full-duplex
operation. It also features independently programmable
receiver and transmitter output phase through
separate pins.
The MAX3070E–MAX3079E transceivers draw 800µA
of supply current when unloaded or when fully loaded
with the drivers disabled. All devices have a 1/8-unit
load receiver input impedance, allowing up to 256
transceivers on the bus.
Applications
Lighting Systems
Industrial Control
Telecom
Security Systems
Instrumentation
Features
3.3V Operation
Electrostatic Discharge (ESD) Protection for
RS-485 I/O Pins
±15kV Human Body Model
True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
Hot-Swap Input Structure on DE and RE
Enhanced Slew-Rate Limiting Facilitates Error-
Free Data Transmission
(MAX3070E–MAX3075E/MAX3079E)
Low-Current Shutdown Mode (Except
MAX3071E/MAX3074E/MAX3077E)
Pin-Selectable Full-/Half-Duplex Operation
(MAX3079E)
Phase Controls to Correct for Twisted-Pair
Reversal (MAX3079E)
Allow Up to 256 Transceivers on the Bus
Available in Industry-Standard 8-Pin SO Package
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-2668; Rev 1; 1/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
MAX3070EEPD -40°C to +85°C 14 Plastic DIP
MAX3070EESD -40°C to +85°C 14 SO
MAX3070EAPD -40°C to +125°C 14 Plastic DIP
MAX3070EASD -40°C to +125°C 14 SO
MAX3071EEPA -40°C to +85°C 8 Plastic DIP
MAX3071EESA -40°C to +85°C 8 SO
MAX3071EAPA -40°C to +125°C 8 Plastic DIP
MAX3071EASA -40°C to +125°C 8 SO
Selector Guide, Pin Configurations, and Typical Operating
Circuits appear at end of data sheet.
Ordering Information continued at end of data sheet.
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Summary of Contents

Page 1 - MAX3070E–MAX3079E

General DescriptionThe MAX3070E–MAX3079E 3.3V, ±15kV ESD-protected,RS-485/RS-422 transceivers feature one driver and onereceiver. These devices includ

Page 2

MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers10 _______________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers__________________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers12 _______________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers__________________________________________________________

Page 6

MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers14 _______________________________________________________

Page 7

Detailed DescriptionThe MAX3070E–MAX3079E high-speed transceivers forRS-485/RS-422 communication contain one driver andone receiver. These devices fea

Page 8

MAX3070E–MAX3079EMAX3079E ProgrammingThe MAX3079E has several programmable operatingmodes. Transmitter rise and fall times are programma-ble, resultin

Page 9

current in IEC 1000-4-2, because series resistance islower in the IEC 1000-4-2 model. Hence, the ESD with-stand voltage measured to IEC 1000-4-2 is ge

Page 10

MAX3070E–MAX3079ELow-Power Shutdown Mode (ExceptMAX3071E/MAX3074E/MAX3077E)Low-power shutdown mode is initiated by bringing bothRE high and DE low. In

Page 11

MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers__________________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers2 ________________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers20 _______________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers__________________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers22 _______________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers__________________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers24 _______________________________________________________

Page 18

MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 TransceiversMaxim cannot assume responsibility for use of any circuitr

Page 19

MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers__________________________________________________________

Page 20

MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers4 ________________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers__________________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers6 ________________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers__________________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers8 ________________________________________________________

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MAX3070E–MAX3079E+3.3V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers__________________________________________________________

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