Standard ICs
Dual monostable multivibrator
BU4528B / BU4528BF
The BU4528B and BU4528BF are monostable multivibrators with trigger and reset functions that can be activated.
Each chip has two built-in circuits.
Triggers can initiate both rising and falling in response to Input A and Input B. As the output monostable pulse width
is determined by the time constant of the external resistance (Rx) and the capacitor (Cx), a wide range of output
pulse widths can be set.
Setting the RESET input to "L" enables external asynchronous resetting and this RESET input can be utilized to
reduce the time from the trigger disable input or the power on until the BU4528B and BU4528BF are ready for mono-
stable operation.
•
Features dissipation.
1) Low power
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
T
11
1
16 V
DD
T
21
RESET
1
2
15 T
12
3
14 T
22
A
1
B
1
4
13 RESET
2
5
12 A
2
Q
1
Q
1
6
11 B
2
7
10 Q
2
V
SS
8
9
Q
2
•
Truth table
INPUT
RESET
H
A
B
H
L
L
H
L, H,
L
X
X
H
L, H,
X
X
Not Triggered
Not Triggered
Not Triggered
Not Triggered
L
H
Q
OUTPUT
Q
•
Logic circuit diagram
C
X
R
X
V
DD
H
H
H
H
H
L
T
1
A
B
RESET
T
2
Q
Q
Not Triggered
1
Standard ICs
BU4528B / BU4528BF
SS
•
Absolute maximum ratings (Ta = 25°C, V
Parameter
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Input voltage
Symbol
V
DD
Pd
Topr
Tstg
V
IN
= 0V)
Limits
– 0.3 ~ + 18
1000 (DIP), 500 (SOP)
– 40 ~ + 85
– 55 ~ + 150
– 0.3 ~ V
DD
+ 0.3
Unit
V
mW
°C
°C
V
•
Electrical characteristics otherwise noted, Ta = 25°C, V
DC characteristics (unless
Parameter
Symbol
Min.
3.5
Input high level voltage
V
IH
7.0
11.0
—
Input low level voltage
V
IL
—
—
Input high level current
Input low level current
I
IH
I
IL
—
—
4.95
Output high level voltage
V
OH
9.95
14.95
—
Output low level voltage
V
OL
—
—
– 0.16
Output high level current
I
OH
– 0.4
– 1.2
0.44
Output low level current
I
OL
1.1
3.0
—
Static current dissipation
I
DD
—
—
Typ.
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
SS
= 0V)
Max.
—
—
—
1.5
3.0
4.0
0.3
µA
µA
V
V
Unit
Conditions
V
DD
(V)
5
10
15
5
10
15
15
15
5
—
—
V
IH
= 15V
V
IL
= 0V
– 0.3
—
—
—
0.05
0.05
0.05
—
—
—
—
—
—
20
40
80
V
10
15
5
I
O
= 0mA
V
10
15
5
I
O
= 0mA
V
OH
= 4.6V
V
OH
= 9.5V
V
OH
= 13.5V
V
OL
= 0.4V
V
OL
= 0.5V
V
OL
= 1.5V
mA
10
15
5
mA
10
15
5
µA
10
15
V
I
= V
DD
or GND
2
Standard ICs
Switching characteristics (Ta = 25°C, C
L
= 50pF, V
SS
= 0V)
Parameter
Symbol
Min.
—
Output rise time
t
TLH
—
—
—
Output fall time
t
THL
—
—
—
Propagation delay time,
A or B to Q or Q
t
PLH
t
PHL
—
—
—
Propagation delay time,
A or B to Q or Q
t
PLH
t
PHL
—
—
—
—
Propagation delay,
Reset to Q or Q
t
PLH
t
PHL
—
—
—
—
—
Minimum input
pulse width
t
WIN
—
—
—
Output pulse width
t
WOUT1
—
—
25
Output pulse width
t
WOUT2
10
15
—
Minimum trigger time
t
rr
—
—
Input capacitance
C
IN
—
Typ.
100
50
40
100
50
40
325
120
90
705
290
210
325
90
60
1000
300
250
70
30
30
550
350
300
40
50
55
0
0
0
5
Max.
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
55
90
95
—
—
—
—
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
µs
µs
ns
ns
ns
pF
BU4528B / BU4528BF
V
DD
(V)
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
—
Conditions
—
—
C
X
= 15pF, R
X
= 5kΩ
C
X
= 1000pF, R
X
= 10kΩ
C
X
= 15pF, R
X
= 5kΩ
C
X
= 1000pF, R
X
= 10kΩ
C
X
= 1000pF, R
X
= 10kΩ
C
X
= 15pF, R
X
= 5kΩ
C
X
= 15pF, R
X
= 5kΩ
C
X
= 1000pF, R
X
= 10kΩ
C
X
= 1000pF, R
X
= 10kΩ
C
X
= 15pF, R
X
= 5kΩ
—
3
Standard ICs
BU4528B / BU4528BF
•
Measurement circuits
V
DD
R
X
C
X
V
DD
A
Q
B
Q
RESET
P.G.
P.G.
P.G.
C
L
C
L
T
2
T
1
V
SS
Fig. 1 Switching time measurement circuit
20ns
20ns
90%
50%
A
20ns
B
90%
50%
10%
20ns
RESET
90%
50%
10%
t
PLH
t
WOUT
t
PLH
t
f
90%
50%
Q
t
PHL
Q
90%
50%
50%
50%
10%
t
WOUT
50%
t
PHL
50%
50%
10%
t
r
10%
t
f
t
PHL
t
r
90%
50%
t
PHL
t
rr
20ns
20ns
10%
50%
Fig. 2 Switching time waveform
4
Standard ICs
BU4528B / BU4528BF
•
Timing chart
A
IN
B
IN
RESET
Q
Q
t
N
: TRIGGER
: RESET
: RETRIGGER
t
N
t
1
[0.2 + 0.1 (V
DD
– V
SS
) ] · RxCx
5
t
2
t
3
t
N
t
N
: (Cx > 0.01µF) t
N
t
1
, t
2
, t
3
: t
1
,t
2
,t
3
< t
N
Fig. 3
•
Electrical characteristic curve
1200
POWER DISSIPATION: Pd (mW)
1000
DIP16
800
600
SOP16
400
200
0
0
25
50
75
100
125
150
AMBIENT TEMPERATURE: Ta (°C)
Fig. 4 Power dissipation vs. Ta
•
External dimensions (Units: mm)
BU4528B
BU4528BF
10.0
±
0.2
19.4
±
0.3
16
9
6.5
±
0.3
16
6.2
±
0.3
4.4
±
0.2
9
1
0.51Min.
3.2
±
0.2 4.25
±
0.3
8
1.5
±
0.1
7.62
1
8
0.3
±
0.1
0.11
1.27
0.4
±
0.1
0.3Min.
0.15
2.54
0.5
±
0.1
0° ~ 15°
DIP16
SOP16
0.15
±
0.1
5
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