REVISION

DATE

DESCRIPTION

PAGES

CHANGED

033005

Redid the formatting based on newer template style. Also deleted the 0F Read ROM command

and added a note about presence pulse criteria.

1–8

10/08

Created newer template-style data sheet.

All

Updated Ordering Information with lead-free part numbers.

1

Deleted Meets UL 913 (4th Edit); Intrinsically Safe Apparatus: Approved Under Entity Concept

for Use in Class I, Division I, Group A, B, C, and D from the Common iButton Features and

iButton Can Physical Specification sections.

1, 3

Updated Electrical Characteristics table:

Deleted Output High Voltage parameter.

Moved 1-Wire Pullup voltage parameter from table header to table body.

Changed VILMAX from 0.8V to 0.3V.

Added Note 14 to the tW0L specification.

Changed tW1LMAX from 15µs – ε to 15µs.

2

Added the epsilon timing to the Write-Zero Time Slot in Figure 7.

8

11/21

Added the DS1990AA part number and related changes

1–6

DS1990A

Serial Number iButton

Revision History

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