Overview
The NE556NS, produced by Texas Instruments, is a dual precision timer integrated circuit. It integrates two independent timing circuits, each similar to the NE555 timer, into a single package. This IC is designed for a wide range of timing applications, offering the convenience of having two timers in a single chip, which reduces the form factor and complexity of the system.
The NE556NS operates in both astable and monostable modes, with external resistor-capacitor (RC) timing control. The device features TTL-compatible outputs that can sink or source up to 200mA, making it versatile for various applications. It is available in several package types, including SOIC, PDIP, and SSOP, to suit different design requirements.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | - | 16 | V |
| Operating Free-Air Temperature (TA) | 0 | - | 70 | °C |
| Output Current (IO) | - | - | ±200 | mA |
| Threshold Voltage Level (VT) | 2.4 | 3.3 | 4.2 | V (at VCC = 5V) |
| Trigger Voltage Level (VTRIG) | 1.1 | 1.67 | 2.2 | V (at VCC = 5V) |
| Reset Voltage Level (VRESET) | 0.3 | 0.7 | 1 | V |
| Low-Level Output Voltage (VOL) | 0.1 | 0.25 | - | V (at IOL = 10mA, VCC = 15V) |
| High-Level Output Voltage (VOH) | 12.75 | 13.3 | - | V (at IOH = -100mA, VCC = 15V) |
Key Features
- Two precision timing circuits per package, similar to the NE555 timer.
- Astable or monostable operation with external RC timing control.
- TTL-compatible output that can sink or source up to 200mA.
- Active pullup or pulldown capability.
- Control voltage pin to modulate the output waveform.
- Reset input to initiate a new timing cycle.
- Available in various packages including SOIC, PDIP, and SSOP.
Applications
- Precision timers from microseconds to hours.
- Pulse-shaping circuits.
- Missing-pulse detectors.
- Pulse-width modulators.
- Pulse-position modulators.
- Sequential timers.
- Pulse generators.
- Frequency dividers.
- Application timers.
- Industrial controls.
Q & A
- What is the NE556NS IC?
The NE556NS is a dual precision timer integrated circuit produced by Texas Instruments, featuring two independent timing circuits similar to the NE555 timer.
- What are the operating modes of the NE556NS?
The NE556NS operates in both astable and monostable modes.
- What is the typical operating voltage of the NE556NS?
The typical operating voltage is +5V, with a maximum of +16V.
- How much current can the output of the NE556NS handle?
The output can sink or source up to 200mA.
- What are the key applications of the NE556NS?
Key applications include precision timers, pulse-shaping circuits, missing-pulse detectors, pulse-width modulators, and industrial controls.
- What packages is the NE556NS available in?
The NE556NS is available in SOIC, PDIP, and SSOP packages.
- How does the control voltage pin affect the NE556NS?
The control voltage pin can be used to modulate the threshold and trigger levels, thus affecting the pulse width of the output waveform.
- What is the purpose of the reset input on the NE556NS?
The reset input is used to initiate a new timing cycle by resetting the flip-flop.
- What are the thermal characteristics of the NE556NS?
The operating free-air temperature range is from 0°C to 70°C, with specific thermal metrics provided in the datasheet.
- How does the NE556NS differ from the NE555 IC?
The NE556NS has two timers in a single package, reducing form factor and complexity compared to using two NE555 ICs.
