Datasheet

Technical Note
3/18
BR25S□□□ Series
www.rohm.com
2010.12 - Rev.B
© 2010 ROHM Co., Ltd. All rights reserved.
●Block diagram
●Operating timing characteristics (Ta=-40～+85°C, unless otherwise specified, load capacity C
L
=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
t
HFS 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
t
HRH 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
t
E/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