ISO7242ADWRG4 Datasheet, PDF (1/21 Pages) Texas Instruments – 1-Mbps QUAD DIGITAL ISOLATORS

www.ti.com
Not Recommended for New Designs
ISO7240A
ISO7241A
ISO7242A
SLLS905E – MAY 2008 – REVISED JANUARY 2010
1-Mbps QUAD DIGITAL ISOLATORS
Check for Samples: ISO7240A, ISO7241A, ISO7242A
FEATURES
1
• 4000-V_peak Isolation, 560-V_peak V_IORM
– UL 1577 , IEC 60747-5-2 (VDE 0884, Rev 2),
IEC 61010-1, IEC 60950-1 and CSA
Approved
• 4 kV ESD Protection
• Operate With 3.3-V or 5-V Supplies
• Typical 25-Year Life at Rated Working Voltage
(See Application Note (SLLA197 ) and
Figure 10)
• 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
See the Product Notification section. The ISO7240A, ISO7241A and ISO7242A 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 ISO7240A has all four channels in the same direction while the ISO7241A has three channels the same
direction and one channel in opposition. The ISO7242A has two channels in each direction.
The 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.
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. (See ISO7240CF (SLLS869) or 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.
ISO7240A
ISO7241A
ISO7242A
V_CC1 1
GND1 2
IN_A 3
IN_B 4
IN_{C 5}
IN_D 6
NC 7
GND1 8
16 VCC2
15 GND2
14 OUT_A
13 OUT_B
12 OUT_C
11 OUT_D
10 EN
9 GND2
V_CC1 1
GND1 2
IN_A 3
IN_B 4
IN_{C 5}
OUT_D 6
EN₁ 7
GND1 8
16 VCC2
15 GND2
14 OUT_A
13 OUT_B
12 OUT_C
11 IN_D
10 EN₂
9 GND2
V_CC1 1
GND1 2
IN_A 3
IN_B 4
OUT_C 5
OUT_D 6
EN₁ 7
GND1 8
16 VCC2
15 GND2
14 OUT_A
13 OUT_B
12 IN_C
11 IN_D
10 EN₂
9 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 © 2008–2010, Texas Instruments Incorporated