Description
Description:
The NE555 Timer IC is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The NE555 Timer IC may be triggered and reset on falling waveforms, and the output circuit can source or sink up to 200mA or drive TTL circuits.
Specifications:
- Package/Case: DIP-8
- Minimum Supply Voltage: 4.5V
- Maximum Supply Voltage: 16V
- Product Series: NE555
- No. of Timers/Counters: 1
- Operating Temperature Range: 0 ~ 70°C
Features:
- Timing from microseconds through hours
- NE555 Timer IC operates in both astable and monostable modes
- NE555 Timer IC has adjustable duty cycle
- Output can source or sink 200 mA
- Output and supply TTL compatible
- NE555 Timer IC has normally on and normally off output
- NE555 Timer IC is available in 8-pin MSOP package
Pin Description:
| Pin | Name | Purpose |
| 1 | GND | Ground reference voltage, low level (0 V) |
| 2 | TRIG | The OUT pin goes high and a timing interval starts when this input falls below 1/2 of CTRL voltage (which is typically 1/3 Vcc, CTRL being 2/3 Vcc by default if CTRL is left open). In other words, OUT is high as long as the trigger low. The output of the timer totally depends upon the amplitude of the external trigger voltage applied to this pin. |
| 3 | OUT | This output is driven to approximately 1.7 V below +Vcc, or to GND. |
| 4 | RESET | A timing interval may be reset by driving this input to GND, but the timing does not begin again until RESET rises above approximately 0.7 volts. Overrides TRIG which overrides threshold. |
| 5 | CTRL | Provides “control” access to the internal voltage divider (by default, 2/3 Vcc). |
| 6 | THR | The timing (OUT high) interval ends when the voltage at threshold is greater than that at CTRL (2/3 Vcc if CTRL is open). |
| 7 | DIS | Open collector output which may discharge a capacitor between intervals. In phase with output. |
| 8 | VCC | Positive supply voltage, which is usually between 3 and 15 V depending on the variation. |
Package Included:
1 x NE555 Timer IC 555 DIP-8 General Purpose Single Bipolar Timer IC
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