NE555D Просмотр технического описания (PDF) - Tiger Electronic

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Компоненты Описание

производитель

NE555D

Single Timer

Tiger Electronic 

NE555N/NE555D

APPLICATION INFORMATION

Table below is the basic operating table of D555/D555F timer

T h r e s h o l d Vo l t a g e

(Vth)(PIN6)

Don’t care

Vth>2Vcc/3

Vcc/3<Vth<2Vcc/3

Vth<Vcc/3

Tr i g g e r Vo l t a g e

(Vtr)(PIN2)

Don’t care

Vth>2Vcc/3

Vcc/3<Vth<2Vcc/3

Vth<Vcc/3

Reset(PIN4)

Low

High

High

High

Output(PIN3)

Low

Low

High

Discharging Tr.

(PIN7)

ON

ON

OFF

When the low signal input is applied to the reset terminal, the timer output remains

low regardless of the threshold voltage or the trigger voltage. Only when the high signal is

applied to the reset terminal, the timer's output changes according to threshold voltage and

trigger voltage.

When the threshold voltage exceeds 2/3 of the supply voltage while the timer output is

high, the timer's internal discharge Tr. turns on, lowering the threshold voltage to below 1/3

of the supply voltage. During this time, the timer output is maintained low. Later, if a low

signal is applied to the trigger voltage so that it becomes 1/3 of the supply voltage, the

timer's internal discharge Tr. turns off, increasing the threshold voltage and driving the

timer output again at high.

1、 Monostable Operation

4/11

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