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MAX14850

Six-Channel Digital Isolator

Typical Operating Circuits

19-6161; Rev 2; 11/14

Ordering Information appears at end of data sheet.

PMBus is a trademark of SMIF, Inc.

EVALUATION KIT AVAILABLE

General Description

The MAX14850 is a six-channel digital isolator utilizing

Maxim’s proprietary process technology, whose monolithic

design provides a compact and low-cost transfer of digital

signals between circuits with different power domains. The

technology enables low power consumption and stable

high-temperature performance.

The four unidirectional channels are each capable of DC

to 50Mbps, with two of the four channels passing data

across the isolation barrier in each direction. The two

bidirectional channels are open-drain; each capable of

data rates from DC to 2Mbps.

Independent 3.0V to 5.5V supplies on each side of the

isolator also make it suitable for use as a level translator.

The MAX14850 can be used for isolating SPI buses, I

buses, RS-232, RS-485/RS-422 buses, and general-pur-

pose isolation. When used as a bus isolator, extra chan-

nels are available for power monitoring and reset signals.

The MAX14850 is available in a narrow body,16-pin SOIC

(10mm x 4mm) package (for which an evaluation kit is

available) and 16-pin QSOP (3.9mm x 4.94mm) package.

The packages are specified over the -40NC to +125NC

automotive temperature range.

Applications

● Industrial Control Systems

● I

C, SPI, SMBus, PMBusK Interfaces

● Isolated RS-232, RS-485/RS-422

● Telecommunication Systems

● Battery Management

● Medical Systems

Benets and Features

● Protection from High-Voltage Environments

• 600VRMS Isolation for 60 Seconds

• Short-Circuit Protection on Unidirectional Outputs

• 200V

RMS

Working Isolation Voltage for 50 Years

● Complete Digital Isolation Solution

• Four Unidirectional Signal Paths: 2-In/2-Out

• Two Bidirectional Open-Drain Signal Paths

• 50Mbps (max) Unidirectional Data Rate

• 2Mbps (max) Bidirectional Data Rate

● Compatible with Many Interface Standards

• I

• SPI

• RS-232, RS-422/RS-485

• SMBus, PMBus Interfaces

I/OA1 RST

SCLK ADC

MOSI

MISO

GPIO1

I/OA2GPIO2

INA1SCLK

INA2MOSI

OUTA1MISO

OUTA2

I/OB1

I/OB2

OUTB1

OUTB2

INB1

INB2GPIO3

µC

GNDA GNDB

CCA

CCB

PUA

PUB

0.1µF 0.1µF

3.3V 5V

CCB

MONITOR

MAX14850

600V

RMS

ISOLATION

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s

website at www.maximintegrated.com.

Summary of content (17 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX14850 Six-Channel Digital Isolator General Description The MAX14850 is a six-channel digital isolator utilizing Maxim’s proprietary process technology, whose monolithic design provides a compact and low-cost transfer of digital signals between circuits with different power domains. The technology enables low power consumption and stable high-temperature performance.
PAGE 2
MAX14850 Six-Channel Digital Isolator Absolute Maximum Ratings VCCA to GNDA.........................................................-0.3V to +6V VCCB to GNDB.........................................................-0.3V to +6V OUTA1, OUTA2 to GNDA...................... -0.3V to (VCCA + 0.3V) OUTB1, OUTB2 to GNDB...................... -0.3V to (VCCB + 0.3V) INB1, INB2, I/OA1, I/OA2 to GNDA.........................-0.3V to +6V INA1, INA2, I/OB1, I/OB2 to GNDB.........................-0.
PAGE 3
MAX14850 Six-Channel Digital Isolator ELECTRICAL CHARACTERISTICS (continued) (VCCA - VGNDA = 3.0V to 5.5V, VCCB - VGNDB = 3.0V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCCA - VGNDA = 3.3V, VCCB - VGNDB = 3.3V, and TA = +25°C.
PAGE 4
MAX14850 Six-Channel Digital Isolator ELECTRICAL CHARACTERISTICS (continued) (VCCA - VGNDA = 3.0V to 5.5V, VCCB - VGNDB = 3.0V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCCA - VGNDA = 3.3V, VCCB - VGNDB = 3.3V, and TA = +25°C.
PAGE 5
MAX14850 Six-Channel Digital Isolator ELECTRICAL CHARACTERISTICS (continued) (VCCA - VGNDA = 3.0V to 5.5V, VCCB - VGNDB = 3.0V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCCA - VGNDA = 3.3V, VCCB - VGNDB = 3.3V, and TA = +25°C.
PAGE 6
MAX14850 Six-Channel Digital Isolator INSULATION AND SAFETY CHARACTERISTICS PARAMETER SYMBOL CONDITIONS VALUE UNIT 4.2 3.81 4.2 3.81 0.
PAGE 7
MAX14850 Six-Channel Digital Isolator Test Circuits/Timing Diagrams VCCA INA1, INA2 50% GNDA VCCA 0.1µF VCCA 0.1µF VCCB 50% tDPLH VCCB tDPHL VCCB MAX14850 50Ω OUTB1 INA_ TEST SOURCE OUTB_ GNDA 50% 50% GNDB GNDB RL CL tDSKEWCC VCCB 90% 50% OUTB2 (A) 10% GNDB tR tF (B) Figure 1. Test Circuit (A) and Timing Diagram (B) for Unidirectional Channels VCCA R1 0.1µF I/OA_ CL1 0.
PAGE 8
MAX14850 Six-Channel Digital Isolator Typical Operating Characteristics (VCCA – VGNDA = 3.3V, VCCB – VGNDB = 3.3V, all inputs idle, TA = +25NC, unless otherwise noted. ICCB vs. DATA RATE 7 5 5 4 INB1/INB2 SWITCHING 5 4 INA1/INA2 SWITCHING 3 2 2 1 1 0 0.001 0 0.001 0.1 1 10 100 0.01 6 9 TA = -40°C 8 10 100 2 1 PULLUP = 2k TA = +125°C 9 0.1 1 5 TA = +25°C 4 2 1 1 0 3.0 3.5 4.5 5.0 5.5 3.0 3.5 5 5 ICCB VCCA = 5V 4 5.0 5 4 5.5 2 3 2 VCCA = 3.3V 3 2 4.
PAGE 9
MAX14850 Six-Channel Digital Isolator Typical Operating Characteristics (continued) (VCCA – VGNDA = 3.3V, VCCB – VGNDB = 3.3V, all inputs idle, TA = +25NC, unless otherwise noted. VCCB = 3.3V 2 1 3 VCCB = 3.3V 2 14 PROPAGATION DELAY (ns) 4 OUTB_ VOL (V) 4 16 MAX14850 toc11 VCCB = 5V OUTB_ VOH (V) 5 MAX14850 toc10 5 3 PROPAGATION DELAY vs. SUPPLY VOLTAGE OUTB_ VOL vs.
PAGE 10
MAX14850 Six-Channel Digital Isolator Typical Operating Characteristics (continued) (VCCA – VGNDA = 3.3V, VCCB – VGNDB = 3.3V, all inputs idle, TA = +25NC, unless otherwise noted. 30 12 HIGH TO LOW 8 6 4 25 20 15 10 VDDA = VDDB I/OA_ TO I/OB_ LOW TO HIGH TRANSITION PULLUP = 1kI 5 2 INB_ TO OUTA_ 0 VGNDB - VGNDA = -100V VGNDB - VGNDA = 0V 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 3.0 TA (°C) 3.5 4.0 4.5 5.0 VDDA = VDDB I/OA_ TO I/OB_ HIGH TO LOW TRANSITION 3.5 3.0 4.
PAGE 11
MAX14850 Six-Channel Digital Isolator Pin Configuration TOP VIEW + 16 VCCB VCCA 1 INA1 2 INA2 3 OUTA1 4 OUTA2 5 12 INB2 I/OA1 6 11 I/OB1 I/OA2 7 10 I/OB2 GNDA 8 9 15 OUTB1 MAX14850 14 OUTB2 13 INB1 GNDB SOIC/QSOP Pin Description PIN NAME FUNCTION VOLTAGE RELATIVE TO 1 VCCA Supply Voltage of Logic Side A. Bypass VCCA with a 0.1FF ceramic capacitor to GNDA. GNDA 2 INA1 Logic Input 1 on Side A. INA1 is translated to OUTB1. GNDA 3 INA2 Logic Input 2 on Side A.
PAGE 12
MAX14850 Six-Channel Digital Isolator Pin Description (continued) PIN NAME FUNCTION VOLTAGE RELATIVE TO 11 I/OB1 Bidirectional Input/Output 1 on Side B. I/OB1 is translated to/from I/OA1 and is a open-drain output. GNDB 12 INB2 Logic Input 2 on Side B. INB2 is translated to OUTA2. GNDB 13 INB1 Logic Input 1 on Side B. INB1 is translated to OUTA1. GNDB 14 OUTB2 Logic Output 2 on Side B. OUTB2 is a push-pull output. GNDB 15 OUTB1 Logic Output 1 on Side B. OUTB1 is a push-pull output.
PAGE 13
MAX14850 Six-Channel Digital Isolator Ground Isolation/Level Shifting The MAX14850 tolerates a ground difference of 600VRMS. Therefore, VGNDA can be 850VDC higher or lower than VGNDB. In addition, the device translates logic levels when (VCCA–VGNDA) is higher or lower voltage than (VCCB–VGNDB), as long as each is within the valid 3.0V to 5.5V range. Unidirectional and Bidirectional Channels The MAX14850 operates both as a unidirectional device and bidirectional device simultaneously.
PAGE 14
MAX14850 Six-Channel Digital Isolator LIFE EXPECTANCY vs. WORKING ISOLATION VOLTAGE 1000 VCCB 5V/div VOUTA_ VOUTB_ VI/OA_ VI/OB_ 400µs/div WORKING LIFE - YEARS (LOG SCALE) VCCA 100 50 VIOWM = 200VRMS 10 1 0.1 0.001 0 100 200 300 400 500 600 700 800 WORKING ISOLATION VOLTAGE (VIOWM) - VRMS Figure 3. Undervoltage Lockout Behavior Figure 4. Life Expectancy vs.
PAGE 15
MAX14850 Six-Channel Digital Isolator Typical Operating Circuits (continued) 0.1µF 3.3V 0.
PAGE 16
MAX14850 Six-Channel Digital Isolator Typical Operating Circuits (continued) 0.1µF 3.3V 0.
PAGE 17
MAX14850 Six-Channel Digital Isolator Revision History REVISION NUMBER REVISION DATE 0 3/12 Initial release 1 5/14 Updated General Description, Benefits and Features, Bidirectional Channels section, Table 2, and Typical Operating Circuits 2 11/14 Added QSOP package and related information Added additional package and ordering information for QSOP DESCRIPTION PAGES CHANGED — 1, 13, 15, 16 1, 2, 6, 11, 13, 16 Maxim Integrated cannot assume responsibility for use of any circuitry other than circui