Interface Guide Texas Instruments 1Q 2009
10
?
Digital Isolators
Design Considerations
Reliability — Proven reliability of silicon-
dioxide (SiO
2)
insulation; stable over
temperature and moisture; life span
> 25 years .
Highest Noise Immunity — Only TI uses
differential signals to cross the isolation
barrier . Giving the highest immunity from
external magnetic and electric fields to
prevent data corruption .
Signaling Rate — TI offers digital isolators
with the highest signaling rates of up to
200 Mbps . With the lowest skew and
pulse distortion of only 1 ns .
Lowest 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/ μ s transient immunity
? Signaling rate: 0 Mbps to 200 Mbps
Passes DC single levels
Low pulse skew
(pulse-width distortion)
? – 40° to 125 ° C operation
? Low-input current requirement of 10 μA
? Fail-safe output
Technical Information
The ISO72xx is a family of digital isolators
using the industry ’ s first application of
silicon-based digital capacitive isolation
technology . Digital buffers capacitively
couple data signals through a dual
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 .
TI produces the SiO
2
insulation in TI
isolation devices in semiconductor
fabrication process producing a near
zero defect glass insulation layer . Then
the input signal crosses this isolation
barrier, as a differential signal to insure
the highest immunity to external noise .
All these features come together to make
the longest lasting, most reliable isolation
devices on the market .
Device Description
Isolation
Rating
(UL, VDE, CSA)
Channel
Direction
Data Rate (Max)
Mbps
Transient
Immunity
(Min) (kV/ μ s)
Supply
Voltage
(V) Price*
Digital Isolators
ISO721/M Single Channel (TTL) 4000 V 1/0 100/150 25 3.3, 5 1.40
ISO722/M Single Channel, OUT EN 4000 V 1/0 100/150 25 3.3, 5 1.40
ISO150 Dual Channel Configurable 2400 V
rms
Config 80 1.6 5 8.10
ISO7220/A/B/C/M Dual Channel 4000 V 2/0 1/5/25/150 25 3.3, 5 0.95
ISO7221/A/B/C/M Dual Channel 4000 V 1/1 1/5/25/150 25 3.3, 5 0.95
ISO7230/A /C/M Triple Channel 4000 V 3/0 1/25/150 25 3.3, 5 1.50
ISO7231/A/C/M Triple Channel 4000 V 2/1 1/25/150 25 3.3, 5 1.50
ISO7240/A/C/M Quad Channel 4000 V 4/0 1/25/150 25 3.3, 5 1.90
ISO7241/A/C/M Quad Channel (TTL) 4000 V 3/1 1/25/150 25 3.3, 5 1.90
ISO7242/A/C/M Quad Channel 4000 V 2/2 1/25/150 25 3.3, 5 1.90
ISO3082/ISO3088 Isolated Half Duplex RS-485 4000 V 2/1 0.2/20 25 5 3.25
ISO3080/ISO3086 Isolated Full Duplex RS-485 4000 V 2/1 0.2/20 25 5 3.25
ISO15/ISO13 Isolated Half Duplex RS-485 4000 V 2/1 1/20 25 3.3 3.00
ISO35/ISO33 Isolated Full Duplex RS-485 4000 V 2/1 1/20 25 3.3 3.00
ISO1176 Isolated PROFIBUS 4000 V 2/1 40 Mbps 25 5 3.35
ISO1050 Isolated CAN Transceiver 4000 V 1/1 1 Mbps 25 5 2.00
AMC1203 Isolated 2nd-Order ? ∑ Modulator 4000 V N/A 10 Mbps 25 5 2.50
*Suggested resale price in U.S. dollars in quantities of 1,000. Preview products are listed in bold blue.
TI ISO Life Expectancy vs. Voltage
Vpeak (continuous)
L
i
f
e
t
i
m
e
i
n
Y
e
a
r
s
200 400 600 800
20
15
11
23
31
43
59
85
28
40
62
Tj = 150C
Tj = 85C
100
10
1000