WF5028 series

SEIKO NPC CORPORATION —4

VERSION DISCRIMINATION INTERNAL COMPONENTS

The WF5028 series device version is not determined solely by the mask pattern, but can also be determined by

the trimming of internal trimming fuses.

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Version determined by laser trimming:

These chips are produced from a common device by the laser trimming of fuses corresponding to the ordered

version, shown in table 1. These devices are shipped for electrical characteristics testing. Laser-trimmed ver-

sions are identified externally by the combination of the version name marking (1) and the locations of

trimmed fuses (2).

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Version determined by mask pattern:

These chips are fabricated using the mask corresponding to the ordered version, and do not require trimming.

Mask-fabricated versions are identified externally by the version name marking (1) only.

Since the WF5028 series devices are manufactured using 2 methods, there are 2 types of IC chip available

(identified externally) for the same version name. The identification markings for all WF5028 series device

versions is shown in table 2.

(750,690)

NPC

F1

F2

F3

F4

F5

F6

F7

F8

F9

(2) Trimming fuses

(1) Version code on die

Table 1. Version and trimming fuses

Version

*1. –: untrimmed,

×: trimmed, F4 to F9 not used

F1

F2

F3

WF5028

×1

–––

WF5028

×2

×

––

WF5028

×3–

×

–

WF5028

×4

××

–

WF5028

×5–

–

×

WF5028

×6

×

–

×

WF5028

×7–

××

I

5028

×1 trimming fuses (untrimmed)

I

5028

×2 trimming fuses (F1 link trimmed)

I

5028

×3 trimming fuses (F2 link trimmed)

I

5028

×4 trimming fuses (F1 and F2 links trimmed)

: trimmed device