BU4021B Datasheet, PDF (1/5 Pages) Rohm – 8-bit static shift register

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.
•^{Absolute maximum ratings (VSS = 0V, Ta = 25°C)}
Parameter
Symbol
Limits
Unit
Power supply voltage
VDD
– 0.3 ~ + 18
V
Power dissipation
Pd
1000 (DIP), 500 (SOP)
mW
Operating temperature
Topr
– 40 ~ + 85
°C
Storage temperature
Tstg
– 55 ~ + 150
°C
Input voltage
VIN
– 0.3 ~ VDD + 0.3
V
•^{Logic circuit diagram}
•^{Block diagram}
P/S
(9)
Ds
(11)
CLOCK
(10)
P1
P2
P3
P4
P5
P6
P7
P8
(7) (6) (5) (4) (13) (14) (15) (1)
DQ
C
DQ
C
DQ DQ DQ
C
C
C
DQ
CQ
DQ
CQ
D
CQ
(2) (12) (3)
Q6
Q7
Q8
P8 1
Q6 2
Q8 3
P4 4
P3 5
P2 6
P8
P7
Q6
P6
Q8
P5
P4
Q7
P3
DS
P2
CLOCK
16 VDD
15 P7
14 P6
13 P5
12 Q7
11 DS
P1 7
P1
P/S
10 CLOCK
VSS 8
9 P/S
•^{Truth table}
Serial operation
t
CLOCK
DS
P
/
S
(t
Q6
=n+
6)
(t
Q7
=n+
7)
(t
Q8
=n+
8)
n
LL
0
?
?
n+1
HL
1
0
?
n+2
LL
0
1
0
n+3
HL
1
0
1
XL
Q6
Q7
Q8
Parallel operation
CLOCK DS P / S Dm Qm^∗
XHL
L
XHH
H
X: Irrelevant
∗: Q6, Q7, and Q8 are external
1