Datasheet

13/16
BR25L010-W, BR25L020-W, BR25L040-W, BR25L080-W, BR25L160-W, BR25L320-W, BR25L640-W
Technical Note
SO load capacity condition
Other cautions
In order to realize more stable high speed operation, it is recommended to make the values of R
PU, RPD as large as
possible, and make the amplitude of signal input to EEPROM close to the amplitude of VCC / GND level.
(*1 At this moment, operating timing guaranteed value is guaranteed.)
Load capacity of SO output pin affects upon delay characteristic of SO output. (Data output delay time, time from HOLD
to High-Z) In order to make output delay characteristic into higher speed, make SO load capacity small. In concrete, "Do
not connect many devices to SO bus", "Make the wire between the controller and EEPROM short", and so forth.
Make the wire length from the microcontroller to EEPROM input signal same length, in order to prevent setup / hold violation
to EEPROM, owing to difference of wire length of each input.
tPD-VIL characteristics
Fig.55 VIL dependency of
data output delay time
Fig.56 SO load dependency of data output delay time
0 0.2 0.4 0.6 0.8 1
VIL[V]
55
65
70
75
80
tPD [ns]
60
VCC
=
1. 8 V
Ta
=
25°C
VIH
=
V
CC
CL
=
100pF
tPD-CL characteristics
40
50
60
70
80
020406080100120
CL [V]
tPD [ns]
VCC
=
1. 8 V Ta
=
25°C
VIH/VIL
=
0.8V
CC/0.2VCC
EEPROM
CL
SO
2010.07 - Rev. B
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.