HCF4098B_01 datasheet(2/10 Pages) STMICROELECTRONICS

No de pièce	HCF4098B

Description	DUAL MONOSTABLE MULTIVIBRATOR

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

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HCF4098B

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An unused RESET input should be tied to VDD .

However, if an entire section of the HCF4098B is

not used, its reset should be tied to VSS (see table

1). In normal operation the circuit triggers (extends

the output pulse one period) on the application of

each new trigger pulse. For operation in the

non-retiggerable mode, Q is connected to -TR

when leading edge triggering (+TR) is used or Q is

connected to +TR when trailing edge triggering

(-TR) is used. The time period (T) for this

multivibrator can be calculated by : T = 1/2 RX CX

for CX > 0.01µF. The min. value of external

resistance, RX, is 5KΩ. The max. values of

external capacitance, CX, is 100 µF. The output

pulse width has variations of

±2.5% typically, over

the temperature range of -55

°C to 125 °C for

CX=1000pF and RX = 100KΩ . For power supply

variation of

±5% typically , for V

DD = 10V and 15V

and

±1% typically for V

DD = 5V at CX = 1000pF

and RX = 5KΩ .

IINPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

FUNCTIONAL DIAGRAM

PIN No

SYMBOL

NAME AND FUNCTION

4, 12

+TR

Leading Trigger Inputs

5, 11

-TR

Trailing Trigger Inputs

3, 13

RESET

Reset Inputs

1, 15

CX1, CX2

External Capacitors

2, 14

RXCX1

RXCX2

External resistors to Vdd

6, 7

Q1, Q1

Ouputs Mono 1

10, 9

Q2, Q2

Outputs Mono 2

8

VSS

Negative Supply Voltage

16

VDD

Positive Supply Voltage

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