BU4538B [ROHM]
Dual precision monostable multivibrator; 双精密单稳多谐振荡器
| 型号： | BU4538B |
| 厂家： | 
ROHM |
| 描述： | Dual precision monostable multivibrator |
| 文件： | 总5页 (文件大小：62K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
4) High fan-out.
2) Wide range of operating power supply voltages.
3) High input impedance.
5) Direct drive of 2 L-TTL inputs and 1 LS-TTL input.
Block diagram
•
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
T1A
T2A
CDA
AA
VDD
T1B
T2B
BA
T1
T2
CD
Q
Q
CDB
AB
BA
BA
T1
T2
BB
QA
CD
Q
Q
QA
QB
QB
VSS
Logic circuit diagram
Truth table
•
•
INPUT
OUTPUT
VDD
VDD
A
B
H
L
CD
H
H
H
H
L
Q
Q
RX
CX
2 (14)
L
L
H
H
T2
6 (10)
7 (9)
R
S
Q
Q
Vref1
Enable
Vref2
Enable
1 (15)
H
L
T1
Output
Latch
4 (12)
A
Control
Q
X
X
L
H
B
5 (11)
Q
CD
S
Reset Latch
R
3 (13)
1
Standard ICs
BU4538B
Absolute maximum ratings (Ta = 25°C, VSS = 0V)
•
Parameter
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Input voltage
Symbol
VDD
Limits
Unit
V
– 0.3 ~ + 18
1000 (DIP)
Pd
mW
°C
°C
V
Topr
Tstg
VIN
– 40 ~ + 85
– 55 ~ + 150
– 0.3 ~ VDD + 0.3
Electrical characteristics
•
DC characteristics (unless otherwise noted, Ta = 25°C, VSS = 0V)
Parameter
Symbol
Min.
Typ.
Max.
Unit
V
Conditions
VDD (V)
5
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
3.5
7.0
11.0
—
—
—
Input high level voltage
VIH
10
15
5
—
1.5
3.0
4.0
0.3
– 0.3
—
—
Input low level voltage
VIL
V
10
15
15
15
5
—
—
Input high level current
Input low level current
IIH
IIL
µA
µA
VIH = 15V
VIL = 0V
—
4.95
9.95
14.95
—
—
VOH
VOL
IOH
IOL
V
10
15
5
IO = 0mA
IO = 0mA
Output high level voltage
Output low level voltage
Output high level current
Output low level current
Static current dissipation
—
0.05
0.05
0.05
—
—
V
10
15
5
—
– 0.16
– 0.4
– 1.2
0.44
1.1
3.0
—
VOH = 4.6V
VOH = 9.5V
VOH = 13.5V
VOL = 0.4V
VOL = 0.5V
VOL = 1.5V
—
mA
mA
µA
10
15
5
—
—
—
10
15
5
—
20
—
IDD
40
10
15
VI = VDD or GND
—
80
2
Standard ICs
BU4538B
Switching characteristics (unless otherwise noted, Ta = 25°C, CL = 50pF, VSS = 0V)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Conditions
—
V
DD
(V)
—
—
100
50
—
—
5
Output rise time
tTLH
ns
10
15
5
—
40
—
—
100
50
—
Output fall time
tTHL
—
—
ns
ns
ns
ns
µs
ms
10
15
5
—
—
40
—
—
300
150
100
250
125
95
—
Propagation delay
time A, B to Q, Q
tPLH
tPHL
—
—
10
15
5
—
—
—
—
—
Propagation delay
time CD to Q, Q
tPLH
tPHL
—
—
—
—
10
15
5
—
—
—
50
—
Minimum input
pulse width
tWIN
—
30
—
10
15
5
—
25
—
185
185
185
8.8
8.8
8.8
—
200
200
200
9.4
9.4
9.4
0
215
215
215
10.0
10.0
10.0
—
tWOUT1
10
15
5
CX = 2000pF, RX = 100kΩ
CX = 0.1µF, RX = 100kΩ
Output pulse width 1
Output pulse width 2
tWOUT2
10
15
5
Minimum retrigger
time
trr
—
0
—
ns
10
15
—
—
—
—
0
—
CIN
—
5
—
pF
Input capacitance
Recommended operating conditions
•
Parameter
Symbol
RX
Min.
Typ.
—
Max.
1000
Unit
kΩ
Conditions
—
—
External timing resistance
External timing capacitance
5
CX
No Limit
pF
3
Standard ICs
BU4538B
Timing chart
•
A
B
CD
Q
Q
tW
tW
t2
t3
tW
t1
t1, t2, t3 < tW
Measurement circuits
•
VDD
RX
CX
VDD T2 T1
A
Q
Q
B
CD
P. G. P. G.
CL
CL
P. G.
VSS
Fig. 1 (a) Switching time
20ns
20ns
90%
50%
50%
10%
20ns
A
B
20ns
90%
50%
10%
20ns
20ns
CD
90%
50%
10%
tTLH
tPHL
trr
tPLH tTHL
tWOUT
tPLH
90%
90%
50%
50%
tPHL
50%
tPHL
50%
10%
10%
Q
Q
tPHL
tTLH
tTHL
90%
50%
50%
50%
50%
10%
tWOUT
Fig. 1 (b) Switching time measurement waveforms
4
Standard ICs
BU4538B
Electrical characteristic curve
•
1200
1000
800
600
400
200
0
0
25
50
75
100
125
150
AMBIENT TEMPERATURE: Ta (°C)
Fig. 2 Power dissipation vs. Ta
External dimensions (Units: mm)
•
19.4 ± 0.3
16
1
9
8
7.62
2.54
0.5 ± 0.1
0° ~ 15°
DIP16
5
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