1
Standard ICs
Dual 4-bit static shift register
BU4015B / BU4015BF
The BU4015B and BU4015BF are 4-stage static shift registers, each consisting of two circuits.
The D flip-flops for each stage share a common reset input, enabling external asynchronous reset at any point.
Also, the flip-flops at each stage are triggered by the rising edge of the clock input.
“H” level reset input resets the contents of all stages to “L”, regardless of the clock and data input, and sets data outputs Q0 to Q3 to “L”.
•
Features
1) Low power dissipation.
2) Wide range of operating power supply voltages.
3) High input impedance.
4) High fan-out.
5) Direct drive of 2 L-TTL inputs and 1 LS-TTL input.
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Block diagram
2
Q
3B
Q1A
Q0A
DA
Q2B
3
4
5
6
RESET
A
7
8
15
14
13
12
11
10
9
V
SS
1
CLOCK
B
D
B
VDD
Q0B
Q1B
Q2B
Q3A
RESET
B
CLOCK
A
16
Q3 Q2 Q1
CL R D
Q
0
CL R D
Q
0 Q1 Q2
Q3
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Logic circuit diagram
D
Q
0 Q1 Q2 Q3
CLOCK
RESET
DQ
CL
Q
R
DQ
CL
Q
R
DQ
CL
Q
R
DQ
CL
Q
R
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Truth table
CLOCK D RESET Q
0
Q
1
Q
2
Q
3
LL LQ0Q
1
Q
2
HL HQ0Q
1
Q
2
X L No Change
XXH L LL
L
X : Irrelevant
2
Standard ICs BU4015B / BU4015BF
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Absolute maximum ratings (VSS = 0V, Ta = 25°C)
Parameter Symbol Limits Unit
Power supply voltage V
DD – 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 V
IN – 0.3 ~ VDD + 0.3 V
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Electrical characteristics
DC characteristics (unless otherwise noted, Ta = 25°C, V
SS = 0V)
Parameter Symbol Min. Typ. Max. Unit Conditions
V
DD (V)
Input high level voltage V
IH
3.5 ——
V
5
—7.0 —— 10
11.0 —— 15
Input low level voltage V
IL
——1.5
V
5
———3.0 10
——4.0 15
Input high level current I
IH ——0.3 µ
A15V
IH = 15V
Input low level current I
IL — — – 0.3 µ
A15V
IL = 0V
Output high level voltage V
OH
4.95 ——
V
5
I
O = 0mA9.95 —— 10
14.95 —— 15
Output low level voltage V
OL
——0.05
V
5
I
O = 0mA——0.05 10
——0.05 15
Output high level current I
OH
– 0.16
——
mA
5V
OH = 4.6V
– 0.4 —— 10 V
OH = 9.5V
– 1.2 —— 15 V
OH = 13.5V
Output low level current I
OL
0.44 ——
mA
5VOL = 0.4V
1.1 —— 10 V
OL = 0.5V
3.0 —— 15 V
OL = 1.5V
Static current dissipation I
DD
——20
µ
A
5
V
I = VDD or GND——40 10
——80 15
3
Standard ICs BU4015B / BU4015BF
Switching characteristics (unless otherwise noted, Ta = 25°C, VSS = 0V, CL = 50pF)
Parameter Symbol Min. Typ. Max. Unit Conditions
V
DD
(V)
t
TLH
—
180
—
ns
5
——
90
—
10
—
65
—
15
t
THL
—
100
—
ns
5
——
50
—
10
—
40
—
15
Propagation delay time,
CLOCK, D
→
Q
t
PLH
t
PHL
—
310
—
ns
5
——
125
—
10
—
90
—
15
Propagation delay time,
RESET to Q
t
PLH
t
PHL
—
460
—
ns
5
——
180
—
10
—
120
—
15
Setup time t
su
—
100
—
ns
5
——
50
—
10
—
40
—
15
Minimum clock
pulse width
—
185
—
ns
5
——
85
—
10
—
55
—
15
Minimum reset
pulse width
—
200
—
ns
5
——
80
—
10
—
60
—
15
Maximum clock
frequency
—
20
—
MHz
5
——
6.0
—
10
—
7.5
—
15
Maximum clock rise
time and fall time
—
100
—
µ
s
5
——
40
—
10
15
—
15
—
Input capacitance C
IN
—
5
—
pF
——
t
WH (CLK)
t
WH (R)
f
(CLK) Max.
t
r (CLK)
t
f (CLK)
Output rise time
Output fall time
4
Standard ICs BU4015B / BU4015BF
•
Measurement circuits
Q3
Q2
Q1
CL
R
DQ
0P. G. 2
P. G. 1
CL
VSS
VDD
CL CL CL
Fig.1 Switching characteristics measurement circuit
GND
CLOCK
RESET
D
Q
0
20ns
20ns
tPHL
20ns
20ns20ns
50%
50%
90%
10%10%
20ns
tSU
tSU
tWH (R)
tWHtWH
tTLH
tPLH
tTHL
50%
90%
10%
tPHL
Fig.2 Switching time measurement waveform
•
Electrical characterisistic curve
POWER DISSIPATION : Pd (mW)
1200
1000
800
600
400
200
0
0 25 50 75 100 125 150
AMBIENT TEMPERATURE : Ta (°C)
SOP16
DIP16
Fig.3 Power dissipation vs.
ambient temperature
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External dimensions (Units: mm)
SOP16
BU4015B BU4015BF
DIP16
0.4 ± 0.11.27
0.15
0.15 ± 0.1
0.3Min.
4.4 ± 0.2
6.2 ± 0.3
0.11
1.5 ± 0.1
1
16
10.0 ± 0.2
8
9
0.51Min.
0.3
± 0.1
916
81
6.5 ± 0.3
3.2
±
0.2
4.25
±
0.3
0.5 ± 0.1
19.4 ± 0.3
2.54
0° ~ 15°
7.62
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