ROHM BU4528BF, BU4528B Datasheet

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

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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

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Electrical characteristics

DC characteristics (unless otherwise noted, Ta = 25°C, V

SS = 0V)