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ISO7221C-Q1 Datasheet(PDF) 16 Page - Texas Instruments

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Part # ISO7221C-Q1
Description  DUAL DIGITAL ISOLATORS
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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ISO7220A-Q1
ISO7221A-Q1
ISO7221C-Q1
SLLS965C – JULY 2009 – REVISED MAY 2012
www.ti.com
Insulation:
Operational insulation — Insulation needed for the correct operation of the equipment.
Basic insulation — Insulation to provide basic protection against electric shock.
Supplementary insulation — Independent insulation applied in addition to basic insulation in order to ensure
protection against electric shock in the event of a failure of the basic insulation.
Double insulation — Insulation comprising both basic and supplementary insulation.
Reinforced insulation — A single insulation system which provides a degree of protection against electric shock
equivalent to double insulation.
Pollution Degree:
Pollution Degree 1 — No pollution, or only dry, nonconductive pollution occurs. The pollution has no influence.
Pollution Degree 2 — Normally, only nonconductive pollution occurs. However, a temporary conductivity caused
by condensation must be expected.
Pollution Degree 3 — Conductive pollution occurs or dry nonconductive pollution occurs which becomes
conductive due to condensation which is to be expected.
Pollution Degree 4 – Continuous conductivity occurs due to conductive dust, rain, or other wet conditions.
Installation Category:
Overvoltage Category — This section is directed at insulation co-ordination by identifying the transient
overvoltages which may occur, and by assigning 4 different levels as indicated in IEC 60664.
I: Signal Level — Special equipment or parts of equipment.
II: Local Level — Portable equipment etc.
III: Distribution Level — Fixed installation
IV: Primary Supply Level — Overhead lines, cable systems
Each category should be subject to smaller transients than the category above.
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