NE555N 查看數據表（PDF） - Tiger Electronic

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产品描述 (功能)

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NE555N

Single Timer

Tiger Electronic 

2、 Astable Operation

NE555N/NE555D

An astable timer operation is achieved by adding resistor RB to Figure 1 and

configuring as shown on Figure 5. In the astable operation, the trigger terminal and the

threshold terminal are connected so that a self-trigger is formed, operating as a multi

vibrator. When the timer output is high, its internal discharging Tr. turns off and the VC1

increases by exponential function with the time constant (RA+RB)*C.

When the VC1, or the threshold voltage, reaches 2Vcc/3, the comparator output on the

trigger terminal becomes high, resetting the F/F and causing the timer output to become low.

This in turn turns on the discharging Tr. and the C1 discharges through the discharging

channel formed by RB and the discharging Tr. When the VC1 falls below Vcc/3, the

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