ISO7240CF Datasheet, PDF (1/16 Pages) Texas Instruments – QUAD DIGITAL ISOLATOR WITH SELECTABLE FAILSAFE OUTPUT

ISO7240CF
www.ti.com ................................................................................................................................................ SLLS869B – SEPTEMBER 2007 – REVISED APRIL 2008
QUAD DIGITAL ISOLATOR WITH SELECTABLE FAILSAFE OUTPUT
FEATURES
1
• 0-Mbps (DC) to 25 Mbps Signaling Rate
– Low Channel-to-Channel Output Skew;
2 ns Max
– Low Pulse-Width Distortion (PWD);
2.5 ns Max
• Typical 25-Year Life at Rated Working Voltage
(see application note SLLA197 and Figure 11)
• 4000-V_peak Isolation, 560 V_peak V_IORM
– UL 1577 , IEC 60747-5-2 (VDE 0884, Rev 2),
IEC 61010-1 and CSA Approved
• 4 kV ESD Protection
• Operates with 3.3-V or 5-V Supplies
• High Electromagnetic Immunity
(see application note SLLA181)
• –40°C to 125°C Operating Range
APPLICATIONS
• Flat Plasma Display Panels
• Industrial Fieldbus
• Computer Peripheral Interface
• Servo Control Interface
• Data Acquisition
DESCRIPTION
The ISO7240CF is a quad-channel digital isolator with an input disable function and a selectable high or low
failsafe-output function with the CTRL pin (pin 10). The device has logic input and output buffers separated by
TI’s silicon dioxide (SiO₂) isolation barrier. When used in conjunction with isolated power supplies, the device
blocks high voltage, isolates grounds, and prevents noise currents from entering the local ground and interfering
with or damaging sensitive circuitry.
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 for more than 4 µs, the input is assumed to be unpowered or not being actively driven, and
the failsafe circuit drives the output to the logic state selected by the user.
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 also includes an input disable function that 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.
This device may be powered from either 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.
The device is characterized for operation over the ambient temperature range of –40°C to 125°C.
V_CC1
GND1
IN_A
IN_B
IN_C
IND
DISABLE
GND1
ISO7240CF
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
CTRL
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 © 2007–2008, Texas Instruments Incorporated