Overview
The NE556NG4, produced by Texas Instruments, is a dual precision timer integrated circuit. This device integrates two independent timing circuits, each similar to the NE555 timer, into a single package. It is designed for a wide range of timing applications and offers both astable and monostable operation modes. The NE556NG4 is known for its high precision and versatility, making it suitable for various industrial and electronic projects.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VCC Supply Voltage | 4.5 | - | 16 | V |
| Operating Temperature (TA) | 0 | - | 70 | °C |
| Output Current (IO) | - | - | ±200 | mA |
| Threshold Voltage Level (VT) | 8.8 | 10 | 11.2 | V (at VCC = 15V) |
| Trigger Voltage Level (VTRIG) | 4.5 | 5 | 5.6 | V (at VCC = 15V) |
| Reset Voltage Level (VRESET) | 0.3 | 0.7 | 1 | V |
| Output Pulse Rise Time (tr) | 100 | 300 | - | ns (CL = 15pF, TA = 25°C) |
| Output Pulse Fall Time (tf) | 100 | 300 | - | ns (CL = 15pF, TA = 25°C) |
Key Features
- Two independent precision timing circuits per package, similar to the NE555 timer.
- Astable or monostable operation modes.
- TTL-compatible output can sink or source up to 200mA.
- Active pullup or pulldown capability.
- External resistor-capacitor (RC) timing control with adjustable thresholds using the control voltage pin (CONT).
- Reset input (RESET) to initiate a new timing cycle.
- Low-impedance discharge path between the discharge pin (DISCH) and ground (GND) when the output is low.
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 NE556NG4?
The NE556NG4 is a dual precision timer integrated circuit produced by Texas Instruments, integrating two independent timing circuits similar to the NE555 timer.
- What are the operating temperature ranges for the NE556NG4?
The NE556NG4 operates within a temperature range of 0°C to 70°C.
- What is the maximum output current of the NE556NG4?
The NE556NG4 can sink or source up to 200mA.
- How does the NE556NG4 support adjustable timing thresholds?
The NE556NG4 allows adjustable thresholds using the control voltage pin (CONT).
- What is the purpose of the reset input (RESET) on the NE556NG4?
The reset input (RESET) is used to initiate a new timing cycle by forcing the output and discharge low.
- What types of applications can the NE556NG4 be used for?
The NE556NG4 can be used for precision timers, pulse-shaping circuits, missing-pulse detectors, pulse-width modulators, and more.
- What is the typical threshold voltage level for the NE556NG4?
The typical threshold voltage level is around 10V at VCC = 15V.
- How does the discharge pin (DISCH) function on the NE556NG4?
The discharge pin (DISCH) provides a low-impedance path to ground when the output is low.
- What is the output pulse rise and fall time for the NE556NG4?
The output pulse rise and fall times are typically between 100ns to 300ns at CL = 15pF and TA = 25°C.
- What are the package options available for the NE556NG4?
The NE556NG4 is available in SOIC (D), PDIP (N), SSOP (DB), and SOP (NS) packages.
