Document
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
T11 1 16 VDD T21 RESET1 2 15 T12
3
14 T22
A1 B1
4
13 RESET2
5
12 A2
Q1 Q1
6
11 B2
7
10 Q2
VSS
8
9
Q2
•Truth table
INPUT RESET H A B H L L H L, H, L X X H L, H, X X Not Triggered Not Triggered Not Triggered Not Triggered L H Q OUTPUT Q
•Logic circuit diagram
CX RX VDD
H
H H H H L
T1 A B RESET
T2 Q Q
Not Triggered
1
Standard ICs
BU4528B / BU4528BF
SS
•Absolute maximum ratings (Ta = 25°C, V
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Input voltage Symbol VDD Pd Topr Tstg VIN
= 0V)
Limits – 0.3 ~ + 18 1000 (DIP), 500 (SOP) – 40 ~ + 85 – 55 ~ + 150 – 0.3 ~ VDD + 0.3 Unit V mW °C °C V
Electrical characteristics • DC characteristics (unless otherwise noted, Ta = 25°C, V
Parameter Symbol Min. 3.5 Input high level voltage VIH 7.0 11.0 — Input low level voltage VIL — — Input high level current Input low level current IIH IIL — — 4.95 Output high level voltage VOH 9.95 14.95 — Output low level voltage VOL — — – 0.16 Output high level current IOH – 0.4 – 1.2 0.44 Output low level current IOL 1.1 3.0 — Static current dissipation IDD — — Typ. — — — — — — — — — — — — — — — — — — — — — — —
SS
= 0V)
Max. — — — 1.5 3.0 4.0 0.3 µA µA V V Unit Conditions
VDD (V) 5 10 15 5 10 15 15 15 5
—
—
VIH = 15V VIL = 0V
– 0.3 — — — 0.05 0.05 0.05 — — — — — — 20 40 80
V
10 15 5
IO = 0mA
V
10 15 5
IO = 0mA
VOH = 4.6V VOH = 9.5V VOH = 13.5V VOL = 0.4V VOL = 0.5V VOL = 1.5V
mA
10 15 5
mA
10 15 5
µA
10 15
VI = VDD or GND
2
Standard ICs
Switching characteristics (Ta = 25°C, CL = 50pF, VSS = 0V)
Parameter Symbol Min. — Output rise time tTLH — — — Output fall time tTHL — — — Propagation delay time, A or B to Q or Q tPLH tPHL — — — Propagation delay time, A or B to Q or Q tPLH tPHL — — — — Propagation delay, Reset to Q or Q tPLH tPHL — — — — — Minimum input pulse width tWIN — — — Output pulse width tWOUT1 — — 25 Output pulse width tWOUT2 10 15 — Minimum trigger time trr — — Input capacitance CIN — Typ. 100 50 40 100 50 40 325 120 90 705 290 210 325 90 60 1000 300 250 70 30 30 550 350 300 40 50 55 0 0 0 5 Max. — — — — — — — — — — — — — — — — — — — — — — — — 55 90 95 — — — — Unit ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns µs µs µs ns ns ns pF
BU4528B / BU4528BF
VDD (V) 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 —
Conditions
—
—
CX = 15pF, RX = 5kΩ
CX = 1000pF, RX = 10kΩ
CX = 15pF, RX = 5kΩ
CX = 1000pF, RX = 10kΩ
CX = 1000pF, RX = 10kΩ CX = 15pF, RX = 5kΩ
CX = 15pF, RX = 5kΩ
CX = 1000pF, RX = 10kΩ
CX = 1000pF, RX = 10kΩ CX = 15pF, RX = 5kΩ —
3
Standard ICs
BU4528B / BU4528BF
•Measurement circuits
VDD RX CX VDD A Q B Q RESET P.G. P.G. P.G. CL CL T2 T1
VSS
Fig. 1 Switching time measurement circuit
20ns
20ns
90% 50% A 20ns B 90% 50% 10% 20ns RESET 90% 50% 10% tPLH tWOUT tPLH tf 90% 50% Q tPHL Q 90% 50% 50% 50% 10% tWOUT 50% tPHL 50% 50% 10% tr 10% tf tPHL tr 90% 50% tPHL trr 20ns 20ns 10% 50%
Fig. 2 Switching time waveform
4
Standard ICs
BU4528B / BU4528BF
•Timing chart
AIN BIN
RESET
Q
Q
tN : TRIGGER : RESET : RETRIGGER
tN
t1
t2
t3
tN
tN : (Cx > 0.01µF) tN Լ [0.2 + 0.1 (VDD – VSS) ] · RxCx 5 t1, t2, t3 : t1,t2 ,t3 < tN
Fig. 3
•Electrical characteristic curve
1200 POWER DISSIPATION: Pd (mW) 1000 DIP16 800
600
SOP16
400
200 0
0
25
50
75
100
125
150
AMBIENT TEMPERATURE: Ta (°C)
Fig. 4 Power dissipation vs. Ta
•External dimensions (Units: mm)
BU4528B BU4528BF
10.0 ± 0.2
19.4 ± 0.3 16 9 6.5 ± 0.3
16 6.2 ± 0.3 4.4 ± 0.2
9
1 0.51Min. 3.2 ± 0.2 4.25 ± 0.3
8
1.5 ± 0.1
7.62
1
8
0.3 ± 0.1
0.11
1.27
0.4 ± 0.1
0.3Min. 0.15
2.54
0.5 ± 0.1
0° ~ 15°
DIP16
SOP16
0.15 ± 0.1
5
.