UMW NE556DR(UMW)

NE556 dual-channel independent timer circuit is a controller that can produce highly accurate time delay or oscillation. In the time delay mode in operation, the time is precisely controlled by an external resistor and capacitor. For stable operation such as an oscillator, the free-running frequency Both rate and duty cycle are accurately controlled by two external resistors and a capacitor. The circuit can be triggered or reset on the falling edge waveform, and the output structure can output or input current up to 200mA.

• Low turn-off time
• The maximum operating frequency is greater than 500kHz
• Time ranges from microseconds to several hours
• There are two working modes: the intermediate steady state and the monostable state
• High output current source or sink 200mA current
• Adjustable duty cycle
• TTL compatibility
• Temperature stability 0.005%/°C

• For a tone pulse train generator, the first timer is used as a monostable and determines the tone duration, which is triggered by a positive pulse at pin 6, and the second timer is triggered by a positive pulse, which is enabled by a high output monostable. It is connected as an unsteady state and determines the frequency of the tone.