ISO7230A Datasheet, PDF (1/17 Pages) Texas Instruments – One Megabit per Second Triple Digital Isolators

ISO7230A
ISO7231A
www.ti.com ........................................................................................................................................................................................................ SLLS906 – MAY 2008
One Megabit per Second Triple Digital Isolators
FEATURES
1
• 1-Mbps Signaling Rate
– 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 10)
• 4000-V_peak Isolation, 560-V_peak V_IORM
– UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2),
IE 61010-1 and CSA Approved
• 4 kV ESD Protection
• Operate With 3.3-V or 5-V Supplies
• High Electromagnetic Immunity
(see application note SLLA181)
• –40°C to 125°C Operating Range
APPLICATIONS
• Industrial Fieldbus
• Computer Peripheral Interface
• Servo Control Interface
• Data Acquisition
DESCRIPTION
The ISO7230A and ISO7231A are triple-channel digital isolators each 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 on a data bus or other circuits from entering the local ground and
interfering with or damaging sensitive circuitry.
The ISO7230 triple-channel device has all three channels in the same direction while the ISO7231 has two
channels in one direction and one channel in opposition. These devices have an active-high output enable that
when driven to a low level, places the output in a high-impedance state and turns off internal bias circuitry to
conserve power.
The ISO7230A and ISO7231A have TTL input thresholds and a noise-filter at the input that prevents transient
pulses of up to 2 ns in duration from being passed to the output of the device.
In each device a periodic update pulse is sent across the isolation 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 require two supply voltages of 3.3-V, 5-V, or any combination. All inputs are 5-V tolerant when
supplied from a 3.3-V supply and all outputs are 4-mA CMOS. 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
NC
NC
GND1
ISO7230
DW PACKAGE
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
NC
EN
GND2
V_CC1
GND1
IN_A
IN_B
OUT_C
NC
EN₁
GND1
ISO7231
DW PACKAGE
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
NC
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 © 2008, Texas Instruments Incorporated