BU4538B Datasheet by Rohm Semiconductor

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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.
4) High fan-out.
5) Direct drive of 2 L-TTL inputs and 1 LS-TTL input.
Block diagram
Logic circuit diagram
2
T2A
T1A
AA
BA
QA
Q
CDT1
T2
Q
QA
CDA 3
4
5
6
7
8
15
14
13
12
11
10
9
VSS
1
T1B
VDD
CDB
AB
BB
QB
T2B
QB
16
BA
Q
CDT1
T2
Q
BA
VDD
RX
2 (14)
1 (15)
4 (12)
T1
Vref1 Enable
SR
Vref2
Reset Latch
QQ
Enable
A
B
CX
VDD
Control
Output
Latch
QS
QR
T2
CD5 (11)
3 (13)
6 (10)
7 (9)
Truth table
INPUT OUTPUT
ABC
DQQ
HH
LH L H
HLH
LH
XXL L H
H
2
Standard ICs BU4538B
Absolute maximum ratings (Ta = 25°C, VSS = 0V)
Parameter Symbol Limits Unit
VDD – 0.3 ~ + 18 V
mW
°C
°C
VIN – 0.3 ~ VDD + 0.3 V
1000 (DIP)
– 55 ~ + 150
– 40 ~ + 85
Pd
Topr
Tstg
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Input voltage
Parameter Symbol Min. Typ. Max. Unit Conditions
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
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
Electrical characteristics
DC characteristics (unless otherwise noted, Ta = 25°C, VSS = 0V)
3
Standard ICs BU4538B
Parameter Symbol Min. Typ. Max. Unit Conditions
tTLH
— 100 —
ns
5
— 50 — 10
— 40 — 15
tTHL
— 100 —
ns
5
— 50 — 10
— 40 — 15
tPLH
tPHL
— 300 —
ns
5
— 150 — 10
— 100 — 15
tPLH
tPHL
— 250 —
ns
5
— 125 — 10
— 95 — 15
tWIN
— 50 —
ns
5
— 30 — 10
— 25 — 15
tWOUT1
185 200 215
µs
5
185 200 215 10
185 200 215 15
tWOUT2
8.8 9.4 10.0
ms
5
8.8 9.4 10.0 10
8.8 9.4 10.0 15
trr
— 0 —
ns
5
— 0 — 10
— 0 — 15
CIN 5 — pF ——
CX = 2000pF, RX = 100k
CX = 0.1µF, RX = 100k
V
DD
(
V
)
Output rise time
Output fall time
Propagation delay
time A, B to Q, Q
Propagation delay
time CD to Q, Q
Minimum input
pulse width
Output pulse width 1
Output pulse width 2
Minimum retrigger
time
Input capacitance
Switching characteristics (unless otherwise noted, Ta = 25°C, CL= 50pF, VSS = 0V)
Recommended operating conditions
Parameter Symbol Min. Typ. Max. Unit Conditions
RX51000 k
CXNo Limit pF
External timing resistance
External timing capacitance
4
Standard ICs BU4538B
Timing chart
tWtWt2t3tW
t1
A
B
CD
Q
Q
t1, t2, t3 < tW
Measurement circuits
P. G. P. G. P. G. CLCL
VDD
RX
CX
CD
A
VDD T2T1
BQ
Q
Fig. 1 (a) Switching time
VSS
A
B
CD
Q
Q
50% 90% 50%
10%
20ns 20ns
50%
50%
50%
50% 50%
50% 50%
50%
20ns 20ns
trr
90%
10%
90%
50%
10%
20ns 20ns
tPLH
tPHL tPHL
tWOUT tPLH tTHL
tTLH
tTLH tPHL
tTHL tPHL
90%
90%
10%
10%
90%
10%
50%
tWOUT
Fig. 1 (b) Switching time measurement waveforms
:JJ
5
Standard ICs BU4538B
POWER DISSIPATION: Pd (mW)
1200
1000
800
600
400
200
00255075100125150
AMBIENT TEMPERATURE: Ta (°C)
Fig. 2 Power dissipation vs. Ta
Electrical characteristic curve
DIP16
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)
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.

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