Filter
Top Products
Interface Selection Guide Texas Instruments 4Q 2006
D
esign Considerations
Reliability — Best-in-class, high voltage
and functional reliability with > 25 years.
M
agnetic 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
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-V
peak
isolation
••
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
T
echnical Information
T
he ISO72xx is a family of digital isolators
u
sing the industry’s first application of digital
capacitive isolation technology. Digital buffers
c
apacitively couple data signals through a
silicone-dioxide (SiO
2
) 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
t
he 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.
10
Digital Isolators
➔
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 V
RMS
No
100 Mbps
25 kV/
µs 3.3 V, 5 V 1.65
ISO721M Single channel (CMOS) 2500 V
RMS
Yes 150 Mbps 25 kV/µs 3.3 V, 5 V 1.65
ISO722 Single channel OUT EN (TTL) 2500 V
RMS
Yes 100 Mbps 25 kV/µs 3.3 V, 5 V 1.75
ISO722M Single channel OUT EN (CMOS)
2500 V
RMS
Y
es
150 Mbps 25 kV/µs 3.3 V, 5 V 1.75
ISO150 Dual channel bi-directional 1500 V
RMS
No 80 Mbps 1.6 kV/µs 5 V 8.10
ISO7220A Dual channel uni-directional (TTL) 2500 V
RMS
No 1 Mbps 25 kV/µs 3.3 V, 5 V 1.10
ISO7220C Dual channel uni-directional (TTL)
2500 V
RMS
No
25 Mbps
25 kV/µs 3.3 V, 5 V 2.00
ISO7220M Dual channel uni-directional (CMOS) 2500 V
RMS
No 150 Mbps 25 kV/µs 3.3 V, 5 V 2.50
ISO7221A Dual channel bi-directional (TTL) 2500 V
RMS
No 1 Mbps 25 kV/µs 3.3 V, 5 V 1.10
ISO7221C Dual channel bi-directional (TTL)
2500 V
RMS
No
25 Mbps
25 kV/µs 3.3 V, 5 V 2.00
ISO7221M Dual channel bi-directional (CMOS) 2500 V
RMS
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.
Magnetic Flux Density vs. Frequency
100E-18
100E-12
100E-6
100E+0
100E+6
0.001 0.01 0.1 1 10 100
MHz
Wb/m
ISO721 Inductive IEC61000-4-9 IEC61000-4-8
2
ISO
721
Isol
ato
rs