BR25S256FVM-WE2 datasheet(3/19 Pages) ROHM

Part #	BR25S256FVM-WE2

Description	High Reliability Series Serial EEPROMs

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Manufacturer	ROHM [Rohm]

Direct Link	http://www.rohm.com

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Technical Note

3/18

BR25S□□□ Series

www.rohm.com

2010.12 - Rev.B

●Block diagram

●Operating timing characteristics (Ta=-40～+85°C, unless otherwise specified, load capacity CL=30pF)

Parameter

Symbol

1.7≦Vcc<2.5V

1.8≦Vcc<2.5V

2.5≦Vcc<4.5V

4.5≦Vcc<5.5V

Unit

Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.

SCK frequency

fSCK

-

3

-

5

-

10

-

20

MHz

SCK high time

tSCKWH

125

-

80

-

40

-

20

-

ns

SCK low time

tSCKWL

125

-

80

-

40

-

20

-

ns

CSB high time

tCS

250

-

90

-

40

-

20

-

ns

CSB setup time

tCSS

100

-

60

-

30

-

15

-

ns

CSB hold time

tCSH

100

-

60

-

30

-

15

-

ns

SCK setup time

tSCKS

100

-

50

-

20

-

15

-

ns

SCK hold time

tSCKH

100

-

50

-

20

-

15

-

ns

SI setup time

tDIS

30

-

20

-

10

-

5

-

ns

SI hold time

tDIH

50

-

20

-

10

-

5

-

ns

Data output delay time

tPD

-

125

-

80

-

40

-

20

ns

Output hold time

tOH

0

-

0

-

0

-

0

-

ns

Output disable time

tOZ

-

200

-

80

-

40

-

20

ns

HOLDB setting setup time

tHFS

100

-

0

-

0

-

0

-

ns

HOLDB setting hold time

tHFH

100

-

20

-

10

-

5

-

ns

HOLDB release setup time

tHRS

100

-

0

-

0

-

0

-

ns

HOLDB release hold time

tHRH

100

-

20

-

10

-

5

-

ns

Time from HOLDB to output High-Z

tHOZ

-

100

-

80

-

40

-

20

ns

Time from HOLDB to output change

tHPD

-

100

-

80

-

40

-

20

ns

SCK rise time

*1

tRC

-

1

-

1

-

1

-

1

μs

SCK fall time

*1

tFC

-

1

-

1

-

1

-

1

μs

OUTPUT rise time

*1

tRO

-

100

-

50

-

40

-

20

ns

OUTPUT fall time

*1

tFO

-

100

-

50

-

40

-

20

ns

Write time

tE/W

-

5

-

5

-

5

-

5

ms

*1 NOT 100% TESTED

Fig.1

Block diagram

INSTRUCTION DECODE

CONTROL CLOCK

GENERATION

VOLTAGE

DETECTION

WRITE

INHIBITION

HIGH VOLTAGE

GENERATOR

INSTRUCTION

REGISTER

32～256K

EEPROM

ADDRESS

REGISTER

DATA

REGISTER

ADDRESS

DECODER

READ/WRITE

AMP

8bit

STATUS REGISTER

1

CSB

2

SO

3

WPB

4

GND

8 Vcc

7 HOLDB

6 SCK

5 SI

12～15bit *1

8bit

12～15bit *1

*1 12bit: BR25S320-W

13bit: BR25S640-W

14bit: BR25S128-W

15bit: BR25S256-W

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