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BU2152FS-E2 データシート(PDF) 19 Page - Rohm

部品番号 BU2152FS-E2
部品情報  Serial / Parallel 4-input Drivers
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メーカー  ROHM [Rohm]
ホームページ  http://www.rohm.com
Logo ROHM - Rohm

BU2152FS-E2 データシート(HTML) 19 Page - Rohm

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BU2050F,BU2092F,BU2092FV,BU2099FV,BD7851FP,BU2152FS
Technical Note
19/24
www.rohm.com
2009.06 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
BU2152FS】
Pin descriptions
Pin
No.
Pin Name
I/O
Function
1
VSS
-
Ground
2
CLK
I
Clock Input
3
VSS
-
Ground
4
DATA
I
Serial Data Input
5~28
P1~P24
O
Parallel Data Output
29
SO
O
Cascade Output
30
STB
I
Strobe Signal Input active “L”
31
CLB
I
Clear Signal Input active “L”
32
VDD
-
Power Supply
Timing chart
Fig. 18
1.
After the power is turned on and the voltage is stabilized, STB should be activated, after clocking 24 data bits into
the DATA terminal.
2.
Pn parallel output data of the shift register is set after the 24
th clock by the LCK.
3.
Since the STB is a label latch, data is retained in the “H” section and renewed in the “L” section of the STB.
4.
The final stage data of the shift register is outputted to the SO by synchronizing with the rise time of the CLOCK.
Truth Table]
Input
Function
CLK
STB
CLB
×
×
L
All the data of the latch circuit are set to “H” (data of shift register does not
change), all the parallel outputs are “H”.
H
H
Serial data of DATA pin are latched to the shift register.
At this time, the data of the latch circuit does not change.
L
L
H
The data of the shift register are transferred to the latch circuit, and the data of
the latch circuit are outputted from the parallel output pin.
H
The data of the shift register shifts 1bit, and the data of the latch circuit and
parallel output also change.
CLK
STB
DATA
DATA24
DATA23
DATA22
DATA2
DATA1
SO
Previous
DATA24
Previous
DATA23
Previous
DATA2
DATA24
Previous
DATA1
DATA23
DATA22
Pn
Previous DATA
DATA


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