NE556 IC
Two independent timing circuits in one package for versatile operation.
- Spec name: NE556 IC
- Parameter: Two independent timing circuits
- Operation Modes: Astable or Monostable
- Timing Control: External resistor-capacitor (RC)
- Threshold Levels: Two-thirds and one-third of VCC
- Control Voltage Input: Modulates the bias
- Output: TTL-Compatible, can sink or source up to 150 mA
- Reset Input: Overrides other inputs for new timing cycle
Top Features:
- Two Precision Timing Circuits Per Package
- Astable or Monostable Operation
- TTL-Compatible Output Can Sink or Source up to 150 mA
- Active Pull up or Pull down
The NE556 IC devices provide two independent timing circuits of the NE555 type in each package. These circuits can be operated in the a stable or the monostable mode with external resistor-capacitor (RC) timing control. The basic timing provided by the RC time constant can be controlled actively by modulating the bias of the control-voltage input. The threshold (THRES) and trigger (TRIG) levels normally are two-thirds and one-third, respectively, of VCC. These levels can be altered by using the control voltage (CONT) terminal. When the trigger input falls below trigger level, the flip-flop is set and the output goes high. If the trigger input is above the trigger level and the threshold input is above the threshold level, the flip-flop is reset, and the output is low. The reset (RESET) input can override all other inputs and can be used to initiate a new timing cycle. When RESET goes low, the flip-flop is reset and the output goes low. When the output is low, a low-impedance path is provided between the discharge (DISCH) terminal and ground (GND).
- Supply voltage: 4.5 - 16 V
- Input voltage: vcc V
- Output current: ±200 mA
- Operating temperature: 0 - 70 °C
Related Document: NE556 IC Data Sheet
* Images are for illustration only; actual product may vary.