BU4538B Datasheet, PDF (1/5 Pages) Rohm – Dual precision monostable multivibrator

Standard ICs
Dual precision monostable
multivibrator
BU4538B
The BU4538B is a monostable multivibrator that can be reset and retriggered. It is triggered from either edge of an
input pulse. As the output pulse width and accuracy are determined by the external timing constants Cx and Rx, a
wide range of accurate output pulse widths is available. Linear CMOS technology makes it possible to control the
output pulse width with greater accuracy. Determination is made based on tWOUT = Rx · Cx throughout the entire
power supply voltage range, eliminating the necessity for other coefficients.
•^Features
1) Low power dissipation.
2) Wide range of operating power supply voltages.
3) High input impedance.
•^{Block diagram}
4) High fan-out.
5) Direct drive of 2 L-TTL inputs and 1 LS-TTL input.
T1A 1
T2A 2
CDA 3
AA 4
BA 5
QA 6
QA 7
VSS 8
BA
T1
CD
Q
QT²
BA
T1
CD
Q
QT²
16 VDD
15 T1B
14 T2B
13 CDB
12 AB
11 BB
10 QB
9 QB
•^{Logic circuit diagram}
VDD
VDD
RX
2 (14)
T2
CX _{1 (15)}
T1
4 (12)
A
B
5 (11)
CD
3 (13)
Vref1 Enable
Vref2 Enable
Control
RQ
SQ
Output
Latch
SQ Reset LatchQ R
6 (10)
7 (9)
•^{Truth table}
INPUT
A
B
CD
H
H
L
H
H
H
L
H
X
X
L
OUTPUT
Q
Q
L
H
L
H
L
H
1