Overview
The NE555V, produced by Texas Instruments, is a highly versatile and widely used integrated circuit (IC) known for its precision timing capabilities. It is part of the 555 timer family, which has been a cornerstone in electronic design for decades due to its robust design and wide range of functionalities. The NE555V can operate in various modes, including monostable, astable, and bistable, making it suitable for a variety of applications such as pulse generation, oscillators, and flip-flop functions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 4.5 | - | 16 (NE555), 18 (SE555) | V |
| Operating Free-Air Temperature | -40 | - | 105 (NE555), -55 to 125 (SE555) | °C |
| Output Current | -200 | - | 200 | mA |
| Trigger Voltage Level | 1.45 | 1.67 | 1.9 | V |
| Threshold Voltage Level | 8.8 | 10 | 11.2 | V |
| Output-Pulse Rise Time (CL = 15 pF) | 100 | - | 200 | ns |
| Output-Pulse Fall Time (CL = 15 pF) | 100 | - | 200 | ns |
Key Features
- Precision timing from microseconds to hours
- Astable or monostable operation with adjustable duty cycle
- TTL-compatible output capable of sinking or sourcing up to 200mA
- Internal structure includes comparators, RS flip-flop, and a discharge transistor
- Voltage divider creates reference voltages at 1/3 and 2/3 of VCC
- Robust output stage capable of driving a wide range of loads directly
- Operates with supply voltages from 5V to 15V
Applications
- Pulse generation and modulation
- Sequential timing and time delay generation
- Oscillator functions and waveform generation
- Flip-flop applications and linear ramp generation
- Experimental physics, data acquisition, and communication devices
- Both simple hobby projects and sophisticated industrial applications
Q & A
- What are the primary operating modes of the NE555V?
The NE555V can operate in monostable, astable, and bistable modes.
- What is the range of supply voltage for the NE555V?
The NE555V operates with supply voltages from 4.5V to 16V (18V for SE555).
- How much current can the output of the NE555V handle?
The output can sink or source up to 200mA.
- What are the trigger and threshold voltage levels for the NE555V?
The trigger level is approximately one-third of the supply voltage, and the threshold level is approximately two-thirds of the supply voltage.
- How does the control voltage pin affect the NE555V's operation?
The control voltage pin can alter the trigger and threshold levels by changing the reference voltages.
- What is the purpose of the discharge pin in the NE555V?
The discharge pin is used to discharge the capacitor in the timing circuit when the transistor saturates.
- Can the NE555V drive loads directly from its output pin?
Yes, the NE555V can drive a wide range of loads directly from its output pin, up to 200mA.
- What are some common applications of the NE555V?
Common applications include pulse generation, oscillators, flip-flop functions, experimental physics, data acquisition, and communication devices.
- How does the NE555V handle temperature variations?
The NE555V is designed to be robust and reliable across a wide temperature range, from -40°C to 105°C (or -55°C to 125°C for SE555).
- What is the significance of the voltage divider in the NE555V?
The voltage divider creates reference voltages at 1/3 and 2/3 of the supply voltage, which are used by the comparators.
