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BU4021B Datasheet(PDF) 1 Page - Rohm

Part No. BU4021B
Description  8-bit static shift register
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Maker  ROHM [Rohm]
Homepage  http://www.rohm.com
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BU4021B Datasheet(HTML) 1 Page - Rohm

   
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1
Standard ICs
8-bit static shift register
BU4021B / BU4021BF
The BU4021B and BU4021BF are 8-bit static shift registers consisting of 8 register cells, each of which has parallel
input. Control of the parallel / serial control input (P / S) enables serial input / serial output with clock synchronization,
as well as parallel input / serial output conversions.
Logic circuit diagram
Truth table
Serial operation
D
Ds
(11)
P / S
(9)
CLOCK
(10)
Q
C
DQ
C
DQ
C
DQ
C
DQ
C
DQ
Q
C
DQ
Q
C
D
Q
C
(2)
Q6
P8
(1)
P7
(15)
P6
(14)
P5
(13)
P4
(4)
P3
(5)
P2
(6)
P1
(7)
(12)
Q7
(3)
Q8
t
CLOCK
nL
L
0
??
n + 1H
L
1
0
?
n + 2
L
L
010
n + 3
H
L
101
XL
Q6
Q7
Q8
Q6
Q7
Q8
DS
P / S
(t = n + 6) (t = n + 7) (t = n + 8)
Block diagram
2
Q6
P8
P4
P3
P2
P1
Q8
3
4
5
6
7
8
15
14
13
12
11
10
9
VSS
1
P7
VDD
P5
Q7
DS
CLOCK
P6
P / S
16
Q6
P8
P4
P3
P2
P1
Q8
P7
P5
Q7
DS
CLOCK
P6
P / S
CLOCK
XH
L
L
XH
H
H
DS
Dm
Qm
X: Irrelevant
: Q6, Q7, and Q8 are external
P / S
Absolute maximum ratings (VSS = 0V, Ta = 25°C)
Parameter
Symbol
Limits
Unit
Power supply voltage
VDD
V
Power dissipation
mW
Operating temperature
Topr
°C
Storage temperature
Tstg
°C
Input voltage
VIN
– 0.3 ~ VDD + 0.3
V
1000 (DIP), 500 (SOP)
Pd
– 0.3 ~ + 18
– 40 ~ + 85
– 55 ~ + 150
Parallel operation


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