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.
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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
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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
H H
H L
H L Not Triggered
H H Not Triggered
H L, H, H Not Triggered
HLL, H, Not Triggered
LXXLH
X X Not Triggered
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Logic circuit diagram
B
A
Q
Q
CX
RX
VDD
T2T1
RESET