ISO7220A-Q1 Datasheet, PDF (1/24 Pages) Texas Instruments – DUAL DIGITAL ISOLATORS

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ISO7220A-Q1
ISO7221A-Q1
ISO7221C-Q1
SLLS965C – JULY 2009 – REVISED MAY 2012
DUAL DIGITAL ISOLATORS
Check for Samples: ISO7220A-Q1, ISO7221A-Q1, ISO7221C-Q1
FEATURES
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• Qualified for Automotive Applications
• 1-Mbps and 25-Mbps Signaling Rate Options
– Low Channel-to-Channel Output Skew:
1 ns (Max)
– Low Pulse-Width Distortion (PWD):
1 ns (Max)
– Low Jitter Content: 1 ns (Typ) at 150 Mbps
• 25-Year (Typ) Life at Rated Voltage
(See Application Report SLLA197 and
Figure 14)
• 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
– 50 kV/μs Typical Transient Immunity
• Operates with 3.3-V or 5-V Supplies
• 4 kV ESD Protection
• 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).
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
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