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 out-
puts 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.
•Block diagram
2
Q3B
Q1A
Q0A
DA
Q2B 3
4
5
6
RESET
A
7
8
15
14
13
12
11
10
9
VSS
1
CLOCK
B
DB
VDD
Q0B
Q1B
Q2B
Q3A
RESET
B
CLOCK
A
16
Q3Q2Q1
CL R D
Q0
CL R D
Q0Q1Q2Q3
•Logic circuit diagram
D
Q0Q1Q2Q3
CLOCK
RESET
DQ
CL Q
R
DQ
CL Q
R
DQ
CL Q
R
DQ
CL Q
R
•Truth table
CLOCK D RESET Q0Q1Q2Q3
LL LQ
0Q1Q2
HL HQ
0Q1Q2
X L No Change
XXH LLL L
X : Irrelevant
2
Standard ICs BU4015B / BU4015BF
•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
•Electrical characteristics
DC characteristics (unless otherwise noted, Ta = 25°C, VSS = 0V)
Parameter Symbol Min. Typ. Max. Unit Conditions
VDD (V)
Input high level voltage VIH
3.5 ——
V
5
—7.0 —— 10
11.0 —— 15
Input low level voltage VIL
——1.5
V
5
———3.0 10
——4.0 15
Input high level current IIH ——0.3 µA15V
IH = 15V
Input low level current IIL — — – 0.3 µA15V
IL = 0V
Output high level voltage VOH
4.95 ——
V
5
IO = 0mA9.95 —— 10
14.95 —— 15
Output low level voltage VOL
——0.05
V
5
IO = 0mA——0.05 10
——0.05 15
Output high level current IOH
– 0.16 ——
mA
5V
OH = 4.6V
– 0.4 —— 10 VOH = 9.5V
– 1.2 —— 15 VOH = 13.5V
Output low level current IOL
0.44 ——
mA
5VOL = 0.4V
1.1 —— 10 VOL = 0.5V
3.0 —— 15 VOL = 1.5V
Static current dissipation IDD
——20
µA
5
VI = 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
→
Qt
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
CLCLCL
Fig.1 Switching characteristics measurement circuit
GND
CLOCK
RESET
D
Q0
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
00 25 50 75 100 125 150
AMBIENT TEMPERATURE : Ta (°C)
SOP16
DIP16
Fig.3 Power dissipation vs.
ambient temperature
•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
