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 monostable 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
H
H
H
L
H L Not Triggered
H H Not Triggered
H
L, H,
H Not Triggered
HL
L, H,
Not Triggered
LXXLH
X X Not Triggered
•
Logic circuit diagram
B
A
Q
Q
CX
RX
VDD
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
V
DD V
mW
Topr
°C
Tstg °C
V
IN – 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
V
DD (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
V
IH
3.5
——
V
5
—
7.0
——
10
11.0
——
15
V
IL
——
1.5
V
5
———
3.0 10
——
4.0 15
I
IH
——
0.3 µ
A15V
IH = 15V
I
IL
——
– 0.3 µ
A15V
IL = 0V
V
OH
4.95
——
V
5
I
O = 0mA9.95
——
10
14.95
——
15
V
OL
——
0.05
V
5
I
O = 0mA
——
0.05 10
——
0.05 15
I
OH
– 0.16
——
mA
5VOH = 4.6V
– 0.4
——
10 V
OH = 9.5V
– 1.2
——
15 V
OH = 13.5V
I
OL
0.44
——
mA
5VOL = 0.4V
1.1
——
10 V
OL = 0.5V
3.0
——
15 V
OL = 1.5V
I
DD
——
20
µ
A
5
V
I = VDD or GND
——
40 10
——
80 15
•
Electrical characteristics
DC characteristics (unless otherwise noted, Ta = 25°C, V
SS = 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
——
CX =
15pF, RX = 5kΩ
CX =
1000pF, RX =
10k
Ω
CX =
15pF, RX = 5kΩ
CX =
1000pF, RX =
10k
Ω
CX =
1000pF, RX =
10k
Ω
CX =
15pF, RX = 5kΩ
CX =
1000pF, RX =
10k
Ω
CX =
15pF,
RX = 5kΩ
CX =
15pF, RX = 5kΩ
CX =
1000pF, RX =
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
B
Q
Q
VDD T2 T1
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
t
rr
90%
10%
90%
50%
10%
20ns 20ns
tPLH
tPHL tPHL
tWOUT tPLH tf
tr
tr
tPHL
tf
tPHL
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
0
0255075100125150
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
t
N tN tNt1 t2 t3
tN : (Cx > 0.01µF) tN ⱌ [0.2 + 0.1 ] · RxCx
t
1, t2, t3 : t1,t2 ,t3 < tN
5
(V
DD – VSS)
Fig. 3
•
Timing chart
Loading...