Seiko Instruments Inc.

1

64-bit FUSE ROM

S-2100R

The S-2100R is a CMOS 64-bit serial FUSE ROM.

It has a low standby

current (0.3

range.

Data can be read serially by clock pulses from address 1 to

address 64.

All the addresses are initialized at “H” so writing into “L”

can be done only once.

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n Block Diagram

CE/PE

8-pin SOP

Top view

8-pin DIP

Top view

Figure 1

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n Features

·

Low standby current (0.3

·

Wide operating voltage range

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n Applications

·

Pager ID ROM

·

Cordless telephone

·

Security equipment

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n Pin Assignment

COUNTER

OUT

8

7

6

5

4

3

2

5

6

7

8

4

1

2

3

1

RST

CLK

DATA

DATA

CE/PE

COUNTER

OUT

RS

CL

Figure 2

DE

VPI

A1

A0

A2

A3

A4

A5

DOUT

DIN

VP

RS

CL

COUT

…

COUNTER

OUT

‡

†

ƒ

‚

•

READ /

WRITE

CONTROL

6-BIT

COUNTER

64-BIT

FUSE ROM

MEMORY

CELL

MATRIX

SENSE

AMP.

COLUMN

DECODER

DATA

CONTROL

CONTROL

CLK

RST

CE/PE

DATA

ROW

DECODER