MAX490EESA Maxim Integrated Products, MAX490EESA Datasheet

MAX490EESA

Manufacturer Part Number

MAX490EESA

Description

+-15kV ESD-protected, low-power, RS-485/RS-422 transceiver. Full-duplex. Data rate 2.5Mbps. Slew-rate limited - n0. Low-power shutdown - no. Receiver/driver enable - no. Quiescent current - 300 microA. Number of transmitter on bus - 32.

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX490EESA.pdf (16 pages)

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The MAX481E, MAX483E, MAX485E, MAX487E–MAX491E,

and MAX1487E are low-power transceivers for RS-485 and

RS-422 communications in harsh environments. Each driver

output and receiver input is protected against ±15kV electro-

static discharge (ESD) shocks, without latchup. These parts

contain one driver and one receiver. The MAX483E,

MAX487E, MAX488E, and MAX489E feature reduced slew-

rate drivers that minimize EMI and reduce reflections caused

by improperly terminated cables, thus allowing error-free

data transmission up to 250kbps. The driver slew rates of the

MAX481E, MAX485E, MAX490E, MAX491E, and MAX1487E

are not limited, allowing them to transmit up to 2.5Mbps.

These transceivers draw as little as 120µA supply current

when unloaded or when fully loaded with disabled drivers

(see Selection Table ). Additionally, the MAX481E,

MAX483E, and MAX487E have a low-current shutdown

mode in which they consume only 0.5µA. All parts operate

from a single +5V supply.

Drivers are short-circuit current limited, and are protected

against excessive power dissipation by thermal shutdown

circuitry that places their outputs into a high-impedance

state. The receiver input has a fail-safe feature that guaran-

tees a logic-high output if the input is open circuit.

The MAX487E and MAX1487E feature quarter-unit-load

receiver input impedance, allowing up to 128 transceivers

on the bus. The MAX488E–MAX491E are designed for full-

duplex communications, while the MAX481E, MAX483E,

MAX485E, MAX487E, and MAX1487E are designed for half-

duplex applications. For applications that are not ESD sen-

sitive see the pin- and function-compatible MAX481,

MAX483, MAX485, MAX487–MAX491, and MAX1487.

________________________Applications

19-0410; Rev 3; 7/96

______________________________________________________________Selection Table

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

_______________General Description

MAX1487E

MAX481E

MAX483E

MAX485E

MAX487E

MAX488E

MAX489E

MAX490E

MAX491E

NUMBER

PART

Low-Power RS-485 Transceivers

Low-Power RS-422 Transceivers

Level Translators

Transceivers for EMI-Sensitive Applications

Industrial-Control Local Area Networks

±15kV ESD-Protected, Slew-Rate-Limited,

HALF/FULL

DUPLEX

________________________________________________________________ Maxim Integrated Products

Half

Full

Low-Power, RS-485/RS-422 Transceivers

DATA RATE

(Mbps)

0.25

2.5

SLEW-RATE

LIMITED

Yes

LOW-POWER

SHUTDOWN

Yes

____________________________Features

Ordering Information continued on last page.

______________Ordering Information

MAX481ECPA

MAX481ECSA

MAX481EEPA

MAX481EESA

ESD Protection: ±15kV—Human Body Model

Slew-Rate Limited for Error-Free Data

Transmission (MAX483E/487E/488E/489E)

Low Quiescent Current:

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

Three-State Outputs

30ns Propagation Delays, 5ns Skew

(MAX481E/485E/490E/491E/1487E)

Full-Duplex and Half-Duplex Versions Available

Allows up to 128 Transceivers on the Bus

(MAX487E/MAX1487E)

Current Limiting and Thermal Shutdown for

Driver Overload Protection

RECEIVER/

120µA (MAX483E/487E/488E/489E)

230µA (MAX1487E)

300µA (MAX481E/485E/490E/491E)

ENABLE

DRIVER

PART

Yes

QUIESCENT

CURRENT

-40°C to +85°C

( A)

300

120

300

120

300

230

TEMP. RANGE

0°C to +70°C

TRANSMITTERS

NUMBER OF

ON BUS

128

PIN-PACKAGE

8 Plastic DIP

8 SO

8 Plastic DIP

8 SO

COUNT

Related parts for MAX490EESA

MAX490EESA Summary of contents

Page 1

... Full 2.5 MAX491E Full 2.5 MAX1487E Half 2.5 ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 ____________________________Features ESD Protection: ±15kV—Human Body Model Slew-Rate Limited for Error-Free Data Transmission (MAX483E/487E/488E/489E) Low Quiescent Current: 120µA (MAX483E/487E/488E/489E) 230µ ...

Page 2

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers ABSOLUTE MAXIMUM RATINGS Supply Voltage (V ) .............................................................12V CC – — – Control Input Voltage ( DE)...................-0. Driver Input Voltage (DI).............................-0. Driver Output Voltage ( ...

Page 3

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers DC ELECTRICAL CHARACTERISTICS (continued ±5 unless otherwise noted.) (Notes MIN MAX PARAMETER SYMBOL No-Load Supply Current I CC (Note 3) Supply ...

Page 4

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers SWITCHING CHARACTERISTICS—MAX481E/MAX485E, MAX490E/MAX491E, MAX1487E ( ±5 unless otherwise noted.) (Notes MIN MAX PARAMETER SYMBOL Driver Enable from Shutdown to t ZH(SHDN) Output ...

Page 5

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers NOTES FOR ELECTRICAL/SWITCHING CHARACTERISTICS Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. Note 2: All ...

Page 6

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers ____________________________Typical Operating Characteristics (continued 5V +25°C, unless otherwise noted DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURE 2 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 -60 ...

Page 7

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers ______________________________________________________________Pin Description PIN MAX481E/MAX483E MAX488E MAX485E/MAX487E MAX490E MAX1487E — 3 — — 5 — — — — — — — ...

Page 8

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers TOP VIEW GND DIP/SO Figure 1. MAX481E/MAX483E/MAX485E/MAX487E/MAX1487E Pin Configuration and Typical Operating Circuit TOP VIEW V ...

Page 9

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers __________Function Tables (MAX481E/MAX483E/MAX485E/MAX487E/MAX1487E) Table 1. Transmitting INPUTS High-Z X High Don't care High-Z = High impedance * Shutdown ...

Page 10

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers 1500 C D DISCHARGE CHARGE CURRENT LIMIT RESISTOR RESISTANCE HIGH C s STORAGE VOLTAGE 100pF CAPACITOR DC SOURCE Figure 4. Human Body ESD Test Model R 50M to 100M R 330 ...

Page 11

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers DIFF Figure 10. Driver/Receiver Timing Test Circuit PLH PHL 1/2 ...

Page 12

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers 10dB/div 0Hz 500kHz/div Figure 16. Driver Output Waveform and FFT Plot of MAX485E/MAX490E/MAX491E/MAX1487E Transmitting a 150kHz Signal The major difference between tests done using the Human Body Model and IEC1000-4-2 is higher peak current ...

Page 13

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers 100pF Z B TTL < 6ns 100pF Figure 18. Receiver Propagation Delay Test Circuit It takes the drivers and receivers longer to ...

Page 14

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers A 500mV/div B RO 5V/div 25ns/div Figure 19. MAX481E/MAX485E/MAX490E/MAX1487E Receiver t PHL A 500mV/div B RO 5V/div 200ns/div Figure 21. MAX483E/MAX487E–MAX489E Receiver s/div Figure 23. ...

Page 15

ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers 120 MAX481E MAX483E MAX485E MAX487E MAX1487E Figure 25. MAX481E/MAX483E/MAX485E/MAX487E/MAX1487E Typical Half-Duplex RS-485 Network A 120 120 ...

Page 16

... Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1996 Maxim Integrated Products PART MAX489ECPD MAX489ECSD MAX489EEPD MAX489EESD MAX490ECPA MAX490ECSA MAX490EEPA MAX490EESA MAX491ECPD MAX491ECSD MAX491EEPD MAX491EESD MAX1487ECPA MAX1487ECSA MAX1487EEPA MAX1487EESA Printed USA is a registered trademark of Maxim Integrated Products. ...

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