ISO7240_1 Datasheet, PDF (1/25 Pages) Texas Instruments – QUAD DIGITAL ISOLATORS

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ISO7240
ISO7241
ISO7242
SLLS868A – SEPTEMBER 2007 – REVISED DECEMBER 2007
QUAD DIGITAL ISOLATORS
FEATURES
1
• 1, 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 15)
• 4000-V_peak Isolation, 560-V_peak Working Voltage
• UL 1577 Certified
• 4 kV ESD Protection
• Operate With 3.3-V or 5-V Supplies
• High Electromagnetic Immunity
(see application report SLLA181)
• –40°C to 125°C Operating Range
APPLICATIONS
• 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 A and 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.
A periodic update pulse is sent across the 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 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.
V_CC1
GND1
IN_A
IN_B
IN_C
IN_D
NC
GND1
ISO7240
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
V_CC2
GND2
OUT_A
OUT_B
OUT_C
OUT_D
EN
GND2
V_CC1
GND1
IN_A
IN_B
IN_C
OUT_D
EN₁
GND1
ISO7241
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
V_CC2
GND2
OUT_A
OUT_B
OUT_C
IN_D
EN₂
GND2
V_CC1
GND1
IN_A
IN_B
OUT_C
OUT_D
EN₁
GND1
ISO7242
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
V_CC2
GND2
OUT_A
OUT_B
IN_C
IN_D
EN₂
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, Texas Instruments Incorporated