ISO7240CF, ISO7240C, ISO7240M
ISO7241C, ISO7241M
ISO7242C, ISO7242M
www.ti.com
SLLS868O – SEPTEMBER 2007 – REVISED NOVEMBER 2012
HIGH SPEED QUAD DIGITAL ISOLATORS
Check for Samples: ISO7240CF, ISO7240C, ISO7240M, ISO7241C, ISO7241M, ISO7242C, ISO7242M
FEATURES
1
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•
•
•
•
Selectable Failsafe Output (ISO7240CF)
25 and 150-Mbps Signaling Rate Options
– Low Channel-to-Channel Output Skew;
1 ns Max
– Low Pulse-Width Distortion (PWD);
2 ns Max
– Low Jitter Content; 1 ns Typ at 150 Mbps
Typical 25-Year Life at Rated Working Voltage
(see application note SLLA197 and Figure 18)
4000-Vpeak VIOTM, 560-Vpeak VIORM per IEC 607475-2 (VDE 0884, Rev 2)
UL 1577 , IEC 61010-1, IEC 60950-1 and CSA
Approved
•
•
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4 kV ESD Protection
Operates With 2.8-V (ISO7241C), 3.3-V or 5-V
Supplies
High Electromagnetic Immunity
(see application report SLLA181)
–40°C to 125°C Operating Range
APPLICATIONS
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Industrial Fieldbus
Computer Peripheral Interface
Servo Control Interface
Data Acquisition
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 2.8-V (ISO7241C only), 3.3-V or 5-V supplies on either side in any
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.
VCC1
GND1
INA
INB
INC
IND
DISABLE
GND1
1
2
3
4
5
6
7
8
ISO7240CF
16
15
14
13
12
11
10
9
ISO7240
VCC2 VCC1
GND2 GND1
OUTA
INA
INB
OUTB
INC
OUTC
OUTD
IND
CTRL
NC
GND2 GND1
1
2
3
4
5
6
7
8
ISO7241
16
15
14
13
12
11
10
9
VCC2
GND2
OUTA
OUTB
OUTC
OUTD
EN
GND2
VCC1
GND1
INA
INB
INC
OUTD
EN1
GND1
1
2
3
4
5
6
7
8
ISO7242
16
15
14
13
12
11
10
9
VCC2
GND2
OUTA
OUTB
OUTC
IND
EN2
GND2
VCC1
GND1
INA
INB
OUTC
OUTD
EN1
GND1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC2
GND2
OUTA
OUTB
INC
IND
EN2
GND2
1
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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 © 2007–2012, Texas Instruments Incorporated
