Texas Instruments 4Q 2006 Digital Isolators Selection Guide, Key Features, Vpeakisolation

10Digital Isolators

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Design Considerations

Reliability — Best-in-class, high voltage and functional reliability with > 25 years.

Magnetic Immunity — Immunity from external magnetic fields to prevent data corruption is a critical consideration for industrial applications. 1E6 times higher magnetic immunity than inductive couplers.

Signaling rate — TI offers digital isolators with the highest signaling rates of up to

Technical Information

The ISO72xx is a family of digital isolators using the industry’s first application of digital capacitive isolation technology. Digital buffers capacitively couple data signals through a silicone-dioxide (SiO2) insulation barrier which provides galvanic isolation of up to 4000 V. The device receives digital inputs and provides clean digital outputs while preventing noise currents and/or excessive voltages from entering the local ground.

Recently introduced alternative isolation techniques that use magnetic coupling may still share the deficiencies of the older opto- coupler solutions such as a restricted operating temperature along with new concerns such as the absence of a fail-safe output, an inability to operate with DC-only signals and concerns associated with susceptibility to external magnetic fields and operating life under high- voltage conditions. TI isolation solutions are designed to eliminate such problems.

150 Mbps.

Jitter — To ensure signal integrity,

jitter reduction is a priority. ISO72xx products offer the lowest jitter with 1-ns jitter at 150-Mbps PRBS NRZ data input.

Key Features

•4000-Vpeakisolation

•UL 1577, IEC 60747-5-2 (VDE 0884, Rev. 2)

•IEC 61010-1 and CSA approved

•50-kV/µs transient immunity

•Signaling rate 0 Mbps to 150 Mbps

•Low propagation delay

•Low pulse skew (pulse-width distortion)

•Low-power sleep mode

•High-electromagnetic immunity

•Low-input current requirement of 10 µA

•Fail-safe output

	Magnetic Flux Density vs. Frequency
		ISO721	Inductive	IEC61000-4-9	IEC61000-4-8
	100E+6					Isol
						ato
						I	rs
						SO
							721
	100E+0
2
Wb/m	100E-6
	100E-12
	100E-18	0.01	0.1	1	10		100
	0.001
				MHz

Digital Isolators Selection Guide

			Low-Power		Transient
		Isolation	Sleep	Data Rate	Immunity	Supply
Device	Description	Rating (UL)	Mode	(Max)	(Min)	Voltage	Price*
ISO721	Single channel (TTL)	2500 VRMS	No	100 Mbps	25 kV/µs	3.3 V, 5 V	1.65
ISO721M	Single channel (CMOS)	2500 VRMS	Yes	150 Mbps	25 kV/µs	3.3 V, 5 V	1.65
ISO722	Single channel OUT EN (TTL)	2500 VRMS	Yes	100 Mbps	25 kV/µs	3.3 V, 5 V	1.75
ISO722M	Single channel OUT EN (CMOS)	2500 VRMS	Yes	150 Mbps	25 kV/µs	3.3 V, 5 V	1.75
ISO150	Dual channel bi-directional	1500 VRMS	No	80 Mbps	1.6 kV/µs	5 V	8.10
ISO7220A	Dual channel uni-directional (TTL)	2500 VRMS	No	1 Mbps	25 kV/µs	3.3 V, 5 V	1.10
ISO7220C	Dual channel uni-directional (TTL)	2500 VRMS	No	25 Mbps	25 kV/µs	3.3 V, 5 V	2.00
ISO7220M	Dual channel uni-directional (CMOS)	2500 VRMS	No	150 Mbps	25 kV/µs	3.3 V, 5 V	2.50
ISO7221A	Dual channel bi-directional (TTL)	2500 VRMS	No	1 Mbps	25 kV/µs	3.3 V, 5 V	1.10
ISO7221C	Dual channel bi-directional (TTL)	2500 VRMS	No	25 Mbps	25 kV/µs	3.3 V, 5 V	2.00
ISO7221M	Dual channel bi-directional (CMOS)	2500 VRMS	No	150 Mbps	25 kV/µs	3.3 V, 5 V	2.50

*Suggested resale price in U.S. dollars in quantities of 1,000.

New products are listed in bold red. Preview products are listed in bold blue.

Interface Selection Guide Texas Instruments 4Q 2006