ISO6541F 4-Channel Digital Isolator Carrier, 3/1, Default Low, Functional Isolation

This module is a carrier board for TI’s ISO6541F general purpose functional isolator, which enables four channels of galvanically isolated digital communication between two devices at up to 50 Mbps per channel.

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This module is a carrier board for TI’s ISO6541F general purpose functional isolator, which enables four channels of galvanically isolated digital communication between two devices at up to 50 Mbps per channel. It provides three forward channels and one reverse channel, and they default to low in the event of input power or signal loss.

Description

Overview

These modules are carrier boards or breakout boards for the ISO654x general purpose functional isolators from Texas Instruments; we therefore recommend referring to the ISO654x datasheet for detailed specifications. The ISO654x features four digital channels that enable communication between two galvanically (electrically) isolated devices at up to 50 Mbps per channel. This isolation means that current cannot flow from one side to the other, and incorrect connections or bad voltages on one side cannot propagate through to damage the device on the other side. It also means the logic voltage can be at different levels on the two sides, allowing these carrier boards to function as level shifters.

The six IC versions feature different combinations of channel directions and default output behaviour as shown in the table below:

	Pololu Item #	IC part number	Default output	Channels	Max data rate	Working voltage ¹	Min PCB Creepage ²	Size	Price

ISO654x carrier	#5740	ISO6540	high	4 forward, 0 reverse	50 Mbps	400 V_RMS	5.3 mm	0.6″×0.7″	$2.75
	#5741	ISO6540F	low	4 forward, 0 reverse
	#5742	ISO6541	high	3 forward, 1 reverse
	#5743	ISO6541F	low	3 forward, 1 reverse
	#5744	ISO6542	high	2 forward, 2 reverse
	#5745	ISO6542F	low	2 forward, 2 reverse

Note 1: IC component functional isolation rating per manufacturer datasheet.
Note 2: Minimum creepage along PCB surface based on layout design only. Other creepage distances, e.g. along the body of the component, may be lower.

Pinouts of the ISO654x 4-Channel Digital Isolator Carrier series.

Details for item #5743

This is the version features the ISO6541F, which has three forward channels and one reverse channel and defaults to low in the event of input power or signal loss. It can be differentiated from the other versions by the “6541F” marking on the IC, and there is also a blank white rectangle on the bottom silkscreen for adding your own distinguishing marks.

Pinout of the ISO6541/ISO6541F 4-Channel Digital Isolator Carrier.

ISO654x 4-Channel Digital Isolator Carrier, bottom view with dimensions and a US quarter for size reference.

PIN	Type	Description
VCC1		Side 1 power supply. Valid ranges: 1.71 V to 1.89 V or 2.25 V to 5.5 V. Note: Side 1 channel output states are undetermined for 1.05 V < VCC1 < 1.71 V and 1.89 V < VCC1 < 2.25 V .
GND1		Ground connection for VCC1.
VCC2		Side 2 power supply. Valid ranges: 1.71 V to 1.89 V or 2.25 V to 5.5 V. Note: Side 2 channel output states are undetermined for 1.05 V < VCC2 < 1.71 V and 1.89 V < VCC2 < 2.25 V .
GND2		Ground connection for VCC2.
INA	input	Input, channel A
INB	input	Input, channel B
INC	input	Input, channel C
IND	input	Input, channel D
OUTA	output	Output, channel A
OUTB	output	Output, channel B
OUTC	output	Output, channel C
OUTD	output	Output, channel D
EN1	input	Side 1 output enable. Output pins on side 1 are enabled when EN1 is high or open and in a high-impedance state when EN1 is low
EN2	input	Side 2 output enable. Output pins on side 2 are enabled when EN2 is high or open and in a high-impedance state when EN2 is low

Each side must be powered separately across its respective VCCx and GNDx pins, and the voltages on the two sides can be at different levels. The two sides are galvanically isolated (GND1 is NOT connected to GND2).

Schematic diagram of the ISO654x 4-Channel Digital Isolator Carrier.

Isolation rating and board creepage considerations

The ISO654x provides functional isolation with a manufacturer-rated working voltage of 400 V_RMS. The IC package has a clearance and creepage of >3.7 mm, and our carrier PCB has a routed slot under the IC that increases the PCB creepage to 5.3 mm. A rough rule of thumb is that uncontaminated FR4 PCBs should have roughly 1 mm of creepage per 100 V_RMS of isolation. Please note that these carrier boards are not certified to any particular safety standard.

Specifications

Dimensions

Size:	0.6″ × 0.7″ × 0.11″
Weight:	0.5 g

General specifications

Maximum data rate:	50 Mbps
Minimum operating voltage:	1.71 V¹
Maximum operating voltage:	5.5 V¹
Channel directions:	3 forward, 1 reverse
Default output:	low
Working isolation voltage:	400 VRMS
Isolated power transfer?:	N
IC part number:	ISO6541F

Identifying markings

PCB dev codes:	iso05a
Other PCB markings:	0J16075, blank white box

Notes:

1: Note: VCC1 and VCC2 can be set independently from each other. Side x channel outputs are in an undetermined state for 1.05V < VCCx < 1.71V and 1.89V < VCCx < 2.25V.