ISO7220A-Q1
ISO7221A-Q1
ISO7221C-Q1
www.ti.com
SLLS965C –JULY 2009–REVISED MAY 2012
DUAL DIGITAL ISOLATORS
Check for Samples: ISO7220A-Q1, ISO7221A-Q1, ISO7221C-Q1
1
FEATURES
•
Qualified for Automotive Applications
•
4000-Vpeak Isolation, 560 Vpeak VIORM
•
1-Mbps and 25-Mbps Signaling Rate Options
–
UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2),
IEC 61010-1, IEC 60950-1 and CSA
Approved
–
–
–
Low Channel-to-Channel Output Skew:
1 ns (Max)
–
50 kV/μs Typical Transient Immunity
Low Pulse-Width Distortion (PWD):
1 ns (Max)
•
•
•
•
Operates with 3.3-V or 5-V Supplies
4 kV ESD Protection
Low Jitter Content: 1 ns (Typ) at 150 Mbps
•
25-Year (Typ) Life at Rated Voltage
(See Application Report SLLA197 and
Figure 14)
High Electromagnetic Immunity
–40°C to 125°C Operating Free-Air
Temperature Range
DESCRIPTION
The ISO7220 and ISO7221 are dual-channel digital isolators. To facilitate PCB layout, the channels are oriented
in the same direction in the ISO7220 and in opposite directions in the ISO7221. These devices have a logic input
and output buffer separated by TI’s silicon-dioxide (SiO2) isolation barrier, providing galvanic isolation of up to
4000 V. 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.
A binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation
barrier. Across the isolation barrier, a differential comparator receives the logic transition information, then sets or
resets a flip-flop and the output circuit accordingly. 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 every 4 μs, the input is assumed to be
unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state.
The small capacitance and resulting time constant provide fast operation with signaling rates available from 0
Mbps (dc) to 25 Mbps.(1)The A-option 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.
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.
(1) The signaling rate of a line is the number of voltage transitions that are made per second expressed in the units bps (bits per second).
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.
Copyright © 2009–2012, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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