1
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
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
Truth table
RESET
1
1
T
11
V
DD
T
12
T
22
RESET
2
A
2
B
2
Q
2
T
21
A
1
B
1
Q
1
V
SS
16
15
14
13
12
11
10
9
2
3
4
5
6
7
8
Q
1
Q
2
INPUT
OUTPUT
RESET
A
B
Q
Q
H
H
H
L
H
L
Not Triggered
H
H
Not Triggered
H
L, H,
H
Not Triggered
H
L
L, H,
Not Triggered
L
X
X
L
H
X
X
Not Triggered
Logic circuit diagram
B
A
Q
Q
C
X
R
X
V
DD
T
2
T
1
RESET
2
Standard ICs
BU4528B / BU4528BF
Absolute maximum ratings (Ta = 25C, V
SS
= 0V)
Parameter
Symbol
Limits
Unit
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Input voltage
V
DD
V
mW
Topr
C
Tstg
C
V
IN
0.3 ~ V
DD
+ 0.3
V
Pd
0.3 ~ + 18
40 ~ + 85
55 ~ + 150
1000 (DIP), 500 (SOP)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Conditions
V
DD
(V)
Input high level voltage
Input low level voltage
Input high level current
Input low level current
Output high level voltage
Output low level voltage
Output high level current
Output low level current
Static current dissipation
V
IH
3.5
--
--
V
5
--
7.0
--
--
10
11.0
--
--
15
V
IL
--
--
1.5
V
5
--
--
--
3.0
10
--
--
4.0
15
I
IH
--
--
0.3
A
15
V
IH
= 15V
I
IL
--
--
0.3
A
15
V
IL
= 0V
V
OH
4.95
--
--
V
5
I
O
= 0mA
9.95
--
--
10
14.95
--
--
15
V
OL
--
--
0.05
V
5
I
O
= 0mA
--
--
0.05
10
--
--
0.05
15
I
OH
0.16
--
--
mA
5
V
OH
= 4.6V
0.4
--
--
10
V
OH
= 9.5V
1.2
--
--
15
V
OH
= 13.5V
I
OL
0.44
--
--
mA
5
V
OL
= 0.4V
1.1
--
--
10
V
OL
= 0.5V
3.0
--
--
15
V
OL
= 1.5V
I
DD
--
--
20
A
5
V
I
= V
DD
or GND
--
--
40
10
--
--
80
15
Electrical characteristics
DC characteristics (unless otherwise noted, Ta = 25C, V
SS
= 0V)
3
Standard ICs
BU4528B / BU4528BF
Parameter
Symbol
Min.
Typ.
Max.
Unit
Conditions
V
DD
(V)
t
TLH
--
100
--
ns
5
--
--
50
--
ns
10
--
40
--
ns
15
t
THL
--
100
--
ns
5
--
--
50
--
ns
10
--
40
--
ns
15
t
PLH
t
PHL
--
325
--
ns
5
--
120
--
ns
10
--
90
--
ns
15
t
PLH
t
PHL
--
705
--
ns
5
--
290
--
ns
10
--
210
--
ns
15
t
PLH
t
PHL
--
325
--
ns
5
--
90
--
ns
10
--
60
--
ns
15
--
1000
--
ns
5
--
300
--
ns
10
--
250
--
ns
15
t
WIN
--
70
--
ns
5
--
30
--
ns
10
--
30
--
ns
15
t
WOUT1
--
550
--
ns
5
--
350
--
ns
10
--
300
--
ns
15
t
WOUT2
25
40
55
s
5
10
50
90
s
10
15
55
95
s
15
t
rr
--
0
--
ns
5
--
0
--
ns
10
--
0
--
ns
15
C
IN
--
5
--
pF
--
--
C
X
= 15pF, R
X
= 5k
C
X
= 1000pF, R
X
= 10k
C
X
= 15pF, R
X
= 5k
C
X
= 1000pF, R
X
= 10k
C
X
= 1000pF, R
X
= 10k
C
X
= 15pF, R
X
= 5k
C
X
= 1000pF, R
X
= 10k
C
X
= 15pF, R
X
= 5k
C
X
= 15pF, R
X
= 5k
C
X
= 1000pF, R
X
= 10k
Output rise time
Output fall time
Propagation delay time,
A or B to Q or Q
Propagation delay time,
A or B to Q or Q
Propagation delay,
Reset to Q or Q
Minimum input
pulse width
Output pulse width
Output pulse width
Minimum trigger time
Input capacitance
Switching characteristics (Ta = 25C, C
L
= 50pF, V
SS
= 0V)
4
Standard ICs
BU4528B / BU4528BF
P.G.
P.G.
P.G.
C
X
C
L
C
L
R
X
V
DD
RESET
A
B
Q
Q
V
DD
T
2
T
1
Fig. 1 Switching time measurement circuit
V
SS
Measurement circuits
A
B
RESET
Q
Q
50%
90%
50%
10%
20ns
20ns
50%
50%
50%
50%
50%
50%
50%
20ns
20ns
t
rr
90%
10%
90%
50%
10%
20ns
20ns
t
PLH
t
PHL
t
PHL
t
WOUT
t
PLH
t
f
t
r
t
r
t
PHL
t
f
t
PHL
90%
90%
10%
50%
10%
90%
50%
t
WOUT
10%
Fig. 2 Switching time waveform
5
Standard ICs
BU4528B / BU4528BF
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. 4 Power dissipation vs. Ta
Electrical characteristic curve
SOP16
BU4528B
BU4528BF
DIP16
0.4
0.1
1.27
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
9
16
8
1
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
External dimensions (Units: mm)
A
IN
B
IN
RESET
Q
: TRIGGER
: RESET
: RETRIGGER
Q
t
N
t
N
t
N
t
1
t
2
t
3
t
N
: (Cx > 0.01
F) t
N
[0.2 + 0.1
] RxCx
t
1
, t
2
, t
3
: t
1
,t
2
,t
3
< t
N
5
(V
DD
V
SS
)
Fig. 3
Timing chart
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