BU2505FV View Datasheet(PDF) - ROHM Semiconductor
Part Name
Description
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BU2505FV Datasheet PDF : 11 Pages
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BU2506FV,BU2505FV
Technical Note
●Cascade Connection
A data output terminal for cascade connection (DO) is available for reducing the number of parts when it is increased.
The DO terminal can be connected to a data input terminal (DI) of the next IC.
However, DO transition is synchronized with rising edge of clock signal, DO signal should be delayed, to keep a limit of data hold
time.
For example RC passive filter can be used.
Also in some cases, an operation frequency of logic signal have to be decreased to ensure a margin of data setup time.
DO
LD
CLK
BU2505 FV
DI
BU2506 FV
(#2)
LD
CLK
CPU
DI
DO
LD
CLK
BU2505 FV
DI
BU2506 FV
(#1)
Therefore, it is better to control LD port of each LSI separately, if extra CPU ports are available.
In this case, more ports to control LD signals are needed, but a consideration described above doesn’t have do be done.
LD1
LD2
DI
CLK
LD
CLK BU2505FV
DI
BU2506FV
( #1)
LD
CLK BU2505FV
DI
BU2506FV
(#2)
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© 2011ROHM Co., Ltd. All rights reserved.
4/10
2011.04 - Rev.B
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