ISO7230C, ISO7230M
ISO7231C, ISO7230M
www.ti.com.................................................................................................................................................. SLLS867F–SEPTEMBER 2007–REVISED JUNE 2008
HIGH SPEED, TRIPLE DIGITAL ISOLATORS
1
FEATURES
•
25 and 150-Mbps Signaling Rate Options
•
•
High Electromagnetic Immunity
(See Application Note SLLA181)
–
–
–
Low Channel-to-Channel Output Skew;
1 ns max
–40°C to 125°C Operating Range
Low Pulse-Width Distortion (PWD);
2 ns max
APPLICATIONS
•
•
•
•
Industrial Fieldbus
Low Jitter Content; 1 ns Typ at 150 Mbps
Computer Peripheral Interface
Servo Control Interface
Data Acquisition
•
•
Typical 25-Year Life at Rated Working Voltage
(See Application Note SLLA197 and Figure 14)
4000-Vpeak Isolation, 560-Vpeak VIORM
–
UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2),
IE 61010-1 and CSA Approved
•
•
4 kV ESD Protection
Operate With 3.3-V or 5-V Supplies
DESCRIPTION
The ISO7230 and ISO7231 are triple-channel digital isolators each with multiple channel configurations and
output enable functions. These devices have logic input and output buffers separated by TI’s silicon dioxide
(SiO2) isolation barrier. Used in conjunction with isolated power supplies, these devices block high voltage,
isolate grounds, and prevent noise currents on a data bus or other circuits from entering the local ground and
interfering with or damaging sensitive circuitry.
The ISO7230 triple-channel device has all three channels in the same direction while the ISO7231 has two
channels in one direction and one channel in opposition. These devices have an active-high output enable that
when driven to a low level, places the output in a high-impedance state.
The ISO7230C and ISO7231C have TTL input thresholds and a noise-filter at the input that prevents transient
pulses of up to 2 ns in duration from being passed to the output of the device, while the ISO7230M and
ISO7231M have CMOS VCC/2 input thresholds and do not have the input noise-filter or the additional propagation
delay.
In each device, a periodic update pulse is sent across the isolation barrier to ensure the proper dc level of the
output. If this dc-refresh pulse is not received, the input is assumed to be unpowered or not being actively driven,
and the failsafe circuit drives the output to a logic high state. (Contact TI for a logic low failsafe option).
These devices require two supply voltages of 3.3-V, 5-V, or any combination. All inputs are 5-V tolerant when
supplied from a 3.3-V supply and all outputs are 4-mA CMOS. These devices are characterized for operation
over the ambient temperature range of –40°C to 125°C.
ISO7230
ISO7231
DW PACKAGE
DW PACKAGE
V
V
V
V
CC2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CC1
CC2
CC1
GND1
GND2
GND1
GND2
IN
A
IN
B
IN
C
OUT
A
IN
IN
OUT
A
A
OUT
B
OUT
B
B
IN
C
OUT
C
OUT
C
NC
NC
NC
NC
NC
EN
EN
EN
2
1
GND1
GND2
GND1
GND2
1
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
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Copyright © 2007–2008, Texas Instruments Incorporated