MAX14432FASE+ datasheet(21/31 Pages) MAXIM

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Detailed Description

The MAX14430–MAX14432 are a family of 4-channel

digital isolators. The MAX14430–MAX14432 have an iso-

lation rating of 3kVRMS (QSOP package) or 3.75kVRMS

(narrow SOIC package) for 60 seconds. The MAX14430–

MAX14432 family offers all three possible unidirectional

channel configurations to accommodate any 4-channel

design, including SPI, RS-232, RS-485, and digital I/O

applications. For applications requiring bidirectional chan-

nels, such as I2C, see the MAX14933 and MAX14937.

The MAX14430 features four channels transferring digital

signals in one direction for applications such as isolated

digital I/O. The MAX14431 has three channels transmitting

data in one direction and one channel transmitting in the

opposite direction, making it ideal for applications such as

isolated SPI and RS-485 communication. The MAX14432

provides further design flexibility with two channels in each

direction for isolated RS-232 or other applications.

Devices are available either in the 16-pin narrow-body

SOIC package and are rated for up to 3.75kVRMS, or in the

16-pin QSOP package and are rated for up to 3kVRMS.This

family of digital isolators offers low-power operation, high

electromagnetic interference (EMI) immunity, and stable

temperature performance through Maxim’s proprietary

process technology. The devices isolate different ground

domains and block high-voltage/high-current transients

from sensitive or human interface circuitry.

Devices are available with a maximum data rate of either

25Mbps (B/E/R/U versions) or 200Mbps (C/F/S/V versions).

Each device can be ordered with default-high or default-

low outputs. The default is the state the output assumes

when the input is not powered or if the input is open circuit.

The devices have two supply inputs (VDDA and VDDB)

that independently set the logic levels on either side of

the device. VDDA and VDDB are referenced to GNDA and

GNDB, respectively. The MAX14430–MAX14432 family

also features a refresh circuit to ensure output accuracy

when an input remains in the same state indefinitely.

Digital Isolation

The MAX14430–MAX14432 family provides galvanic iso-

lation for digital signals that are transmitted between two

ground domains. Two isolation ratings are available in two

different package options. The devices in the narrow-body

SOIC package withstand differences of up to 3.75kVRMS

for up to 60 seconds, and up to 630VPEAK of continuous

isolation. The devices in the QSOP package withstand

differences of up to 3kVRMS for up to 60 seconds, and up

to 630VPEAK of continuous isolation. See the Ordering

Information and Product Selector Guide for suffixes asso-

ciated with each option.

Level-Shifting

The wide supply voltage range of both VDDA and VDDB

allows the MAX14430–MAX14432 family to be used for

level translation in addition to isolation. VDDA and VDDB

can be independently set to any voltage from 1.71V

to 5.5V. The supply voltage sets the logic level on the

corresponding side of the isolator.

Unidirectional Channels

Each channel of the MAX14430–MAX14432 is unidirectional;

it only passes data in one direction, as indicated in the

functional diagram. Each device features four unidirectional

channels that operate independently with guaranteed data

rates from DC up to 25Mbps (B/E/R/U versions), or from

DC to 200Mbps (C/F/S/V versions). The output driver of each

channel is push-pull, eliminating the need for pullup

resistors. The outputs are able to drive both TTL and

CMOS logic inputs.

www.analog.com

Analog Devices │ 21

MAX14430–MAX14432

Four-Channel, Fast, Low-Power,

3kVRMS and 3.75kVRMS Digital Isolators

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