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
RESET1
1T11 VDD
T12
T22
RESET2
A2
B2
Q2
T21
A1
B1
Q1
VSS
16
15
14
13
12
11
10
9
2
3
4
5
6
7
8
Q1
Q2
INPUT OUTPUT
RESET A B Q Q
HH
HL
H L Not Triggered
H H Not Triggered
HL, H, H Not Triggered
HL
L, H, Not Triggered
LXXLH
X X Not Triggered
•Logic circuit diagram
B
AQ
Q
CXRXVDD
T2T1
RESET
2
Standard ICs BU4528B / BU4528BF
•Absolute maximum ratings (Ta = 25°C, VSS = 0V)
Parameter Symbol Limits Unit
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Input voltage
VDD V
mW
Topr °C
Tstg °C
VIN – 0.3 ~ VDD + 0.3 V
Pd
– 0.3 ~ + 18
– 40 ~ + 85
– 55 ~ + 150
1000 (DIP), 500 (SOP)
Parameter Symbol Min. Typ. Max. Unit Conditions
VDD (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
VIH
3.5 ——
V
5
—
7.0 —— 10
11.0 —— 15
VIL
——1.5
V
5
———3.0 10
——4.0 15
IIH ——0.3 µA15V
IH = 15V
IIL ——
– 0.3 µA15V
IL = 0V
VOH
4.95 ——
V
5
IO = 0mA9.95 —— 10
14.95 —— 15
VOL
——
0.05
V
5
IO = 0mA
——
0.05 10
——
0.05 15
IOH
– 0.16 ——
mA
5VOH = 4.6V
– 0.4 —— 10 VOH = 9.5V
– 1.2 —— 15 VOH = 13.5V
IOL
0.44 ——
mA
5VOL = 0.4V
1.1 —— 10 VOL = 0.5V
3.0 —— 15 VOL = 1.5V
IDD
——20
µA
5
VI = VDD or GND
——40 10
——80 15
•Electrical characteristics
DC characteristics (unless otherwise noted, Ta = 25°C, VSS = 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
µ
s5
10 50 90
µ
s10
15 55 95
µ
s15
t
rr
—
0
—
ns 5
—
0
—
ns 10
—
0
—
ns 15
C
IN
—
5
—
pF
——
C
X
=
15pF,
R
X
=
5k
Ω
C
X
=
1000pF,
R
X
=
10k
Ω
C
X
=
15pF,
R
X
=
5k
Ω
C
X
=
1000pF,
R
X
=
10k
Ω
C
X
=
1000pF,
R
X
=
10k
Ω
C
X
=
15pF,
R
X
=
5k
Ω
C
X
=
1000pF,
R
X
=
10k
Ω
C
X
=
15pF,
R
X
=
5k
Ω
C
X
=
15pF,
R
X
=
5k
Ω
C
X
=
1000pF,
R
X
=
10k
Ω
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 = 25°C, CL= 50pF, VSS = 0V)
4
Standard ICs BU4528B / BU4528BF
P.G. P.G. P.G.
CX
CLCL
RX
VDD
RESET
A
BQ
Q
VDD T2T1
Fig. 1 Switching time measurement circuit
VSS
•Measurement circuits
A
B
RESET
Q
Q
50%
90%
50%
10%
20ns 20ns
50%
50% 50%
50%
50% 50%
50%
20ns20ns
trr
90%
10%
90%
50%
10%
20ns 20ns
tPLH
tPHL tPHL
tWOUT tPLH tf
tr
trtPHL
tftPHL
90%
90%
10%
50%
10%
90%
50%
tWOUT
10%
Fig. 2 Switching time waveform
5
Standard ICs BU4528B / BU4528BF
POWER DISSIPATION: Pd (mW)
1200
1000
800
600
400
200
00255075100125150
AMBIENT TEMPERATURE: Ta (°C)
SOP16
DIP16
Fig. 4 Power dissipation vs. Ta
•Electrical characteristic curve
SOP16
BU4528B BU4528BF
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
•External dimensions (Units: mm)
AIN
BIN
RESET
Q
: TRIGGER
: RESET
: RETRIGGER
Q
tNtNtNt1t2t3
tN : (Cx > 0.01µF) tN ⱌ [0.2 + 0.1 ] · RxCx
t1, t2, t3 : t1,t2 ,t3 < tN5
(VDD – VSS)
Fig. 3
•Timing chart
Appendix
Appendix1-Rev1.0
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
