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●

Pin assignment and description

Terminal name Input/Output

Function

Vcc

–

Power source to be connected

GND

–

All input / output reference voltage, 0V

CSB

Input

Chip select input

SCK

Input

Serial clock input

SI

Input

Start bit, ope code, address, and serial data input

SO

Output

Serial data output

HOLDB

Input

Hold input

Command communications may be suspended temporarily

(HOLD status)

WPB

Input

Write protect input

Write command is prohibited

*1

Write status register command is prohibited.

*1:BR25H010/020/040-W

●

Operating timing characteristics

2.5≤Vcc≤5.5V

Parameter

Symbol

Min.

Typ. Max

Unit

SCK frequency

fSCK

–

–

5

MHz

SCK high time

tSCKWH

85

–

–

ns

SCK low time

tSCKWL

85

–

–

ns

CSB high time

tCS

85

–

–

ns

CSB setup time

tCSS

90

–

–

ns

CSB hold time

tCSH

85

–

–

ns

SCK setup time

tSCKS

90

–

–

ns

SCK hold time

tSCKH

90

–

–

ns

SI setup time

tDIS

20

–

–

ns

SI hold time

tDIH

30

–

–

ns

Data output delay time1

tPD1

–

–

70

ns

Data output delay time1

tPD2

–

–

55

ns

Output hold time

tOH

0

–

–

ns

Output disable time

tOZ

–

–

100

ns

HOLDB setting

setup time

tHFS

0

–

–

ns

HOLDB setting

hold time

tHFH

40

–

–

ns

HOLDB release

setup time

tHRS

0

–

–

ns

HOLDB release

hold time

tHRH

70

–

–

ns

Time from HOLDB

to output High-Z

tHOZ

–

–

100

ns

Time from HOLDB

To output change

tHPD

–

–

70

ns

SCK rise time

tRC

–

–

1

μs

SCK fall time

tFC

–

–

1

μs

OUTPUT

rise time

tRO

–

–

50

ns

OUTPUT

fall time

tFO

–

–

50

ns

Write time

tE/W

–

–

5

ms

●

Sync data input / output

timing

SI is taken into IC inside in sync with data rise edge of SCK.

Input address and data from the most significant bit MSB.

SO is output in sync with data fall edge of SCK. Data is output

from the most significant bit MSB.

●

AC measurement conditions

Limits

Parameter

Symbol

Min.

Typ.

Max

Unit

Load capacity 1

–

–

100

pF

Load capacity 2

–

–

30

pF

Input rise time

–

–

–

50

ns

Input fall time

–

–

–

50

ns

Input voltage

–

0.2Vcc/0.8Vcc

V

Input / Output judgment voltage

–

0.3Vcc/0.7Vcc

V

Vcc

HOLDB SCK

SI

CSB

SO

WPB

GND

BR25H010-W

BR25H020-W

BR25H040-W

BR25H080-W

BR25H160-W

BR25H320-W

Fig.2 Pin assignment diagram

Fig.3 Input timing

Fig.4 Input / Output timing

Fig.5 HOLD timing

CSB

SCK

SI

SO

tPD

tOH

tRO,tFO

tOZ

tCSH tSCKH

tCS

High-Z

CSB

SCK

SI

SO

tCS

tCSS

tSCKS

tSCKWL

tSCKWH

tDIS tDIH

tRC

tFC

High-Z

CSB

SCK

SI

n+1

"H"

"L"

n

Dn

n-1

Dn

Dn-1

HOLDB

SO

Dn+1

tHFS tHFH

tHOZ

tHRS tHRH

tDIS

tHPD

High-Z