ISO7240CF, ISO7240C, ISO7240M
ISO7241C, ISO7241M
ISO7242C, ISO7242M
www.ti.com ........................................................................................................................................ SLLS868I–SEPTEMBER 2007–REVISED DECEMBER 2008
HIGH SPEED QUAD DIGITAL ISOLATORS
1
FEATURES
•
Selectable Failsafe Output (ISO7240CF)
•
•
•
4 kV ESD Protection
•
25 and 150-Mbps Signaling Rate Options
Operate With 3.3-V or 5-V Supplies
–
–
–
Low Channel-to-Channel Output Skew;
1 ns Max
High Electromagnetic Immunity
(see application report SLLA181)
•
–40°C to 125°C Operating Range
Low Pulse-Width Distortion (PWD);
2 ns Max
APPLICATIONS
Low Jitter Content; 1 ns Typ at 150 Mbps
•
•
•
•
Industrial Fieldbus
•
•
Typical 25-Year Life at Rated Working Voltage
(see application note SLLA197 and Figure 17)
Computer Peripheral Interface
Servo Control Interface
Data Acquisition
4000-Vpeak Isolation, 560-Vpeak VIORM
–
UL 1577 , IEC 60747-5-2 (VDE 0884, Rev 2),
IEC 61010-1, IEC 60950-1 and CSA
Approved
DESCRIPTION
The ISO7240, ISO7241 and ISO7242 are quad-channel digital isolators 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 from entering the local ground and interfering with or damaging
sensitive circuitry.
The ISO7240 has all four channels in the same direction while the ISO7241 has three channels the same
direction and one channel in opposition. The ISO7242 has two channels in each direction.
The C option devices have TTL input thresholds and a noise-filter at the input that prevents transient pulses from
being passed to the output of the device. The M option devices have CMOS Vcc/2 input thresholds and do not
have the input noise-filter or the additional propagation delay.
The ISO7240CF has an input disable function on pin 7, and a selectable high or low failsafe-output function with
the CTRL pin (pin 10). The failsafe-output is a logic high when a logic-high is placed on the CTRL pin or it is left
unconnected. If a logic-low signal is applied to the CTRL pin, the failsafe-output becomes a logic-low output
state. The ISO7240CF input disable function prevents data from being passed across the isolation barrier to the
output. When the inputs are disabled, the outputs are set by the CTRL pin.
These devices may be powered from either 3.3-V or 5-V supplies on either side in any 3.3-V / 3.3-V, 5-V / 5-V,
5-V / 3.3-V, or 3.3-V / 5-V combination. Note that the signal input pins are 5-V tolerant regardless of the voltage
supply level being used.
These devices are characterized for operation over the ambient temperature range of –40°C to 125°C.
ISO7240
ISO7241
ISO7242
ISO7240CF
V
1
2
3
4
5
6
7
8
V
V
V
V
V
V
V
CC2
16
1
2
3
4
5
6
7
8
16
15
1
2
3
4
5
6
7
8
16
15
1
2
3
4
5
6
7
8
16
15
CC2
CC1
CC1
CC2
CC1
CC2
CC1
15
GND2
GND1
GND1
GND2 GND1
GND2 GND1
GND2
14
13
12
11
10
9
OUT
A
IN
A
IN
B
IN
C
IN
A
IN
B
IN
C
14
13
12
11
10
9
OUT
OUT
OUT
IN
IN
IN
14
13
12
11
10
9
OUT
OUT
OUT
IN
IN
14
13
12
11
10
9
OUT
A
A
B
C
A
A
B
C
A
B
C
OUT
B
OUT
B
B
OUT
C
OUT
OUT
IN
C
C
OUT
D
OUT
EN
OUT
IN
D
IN
D
IN
D
IN
D
D
D
D
CTRL
GND2
EN
EN
1
DISABLE
GND1
NC
EN
2
EN
2
1
GND1
GND2 GND1
GND2 GND1
GND2
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007–2008, Texas Instruments Incorporated
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