Overview
The NE556D, manufactured by Texas Instruments, is a dual precision timer IC that integrates two independent timing circuits similar to the NA555, NE555, SA555, or SE555 types. This device is designed to provide accurate and highly stable time delays or oscillations, making it versatile for various timing applications. Each timer section can operate in either astable or monostable mode, controlled by external resistor-capacitor (RC) timing circuits. The NE556D is available in 14-pin SOIC and PDIP packages, catering to different design requirements.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 4.5 | - | 16 | V |
| Operating Temperature Range | 0 | - | 70 | °C |
| Output Current | - | - | ±200 | mA |
| Trigger Voltage Level (VCC = 15V) | 4.5 | 5 | 5.6 | V |
| Threshold Voltage Level (VCC = 15V) | 8.8 | 10 | 11.2 | V |
| Low-Level Output Voltage (VCC = 15V, IOL = 10mA) | 0.1 | 0.25 | - | V |
| High-Level Output Voltage (VCC = 15V, IOH = -100mA) | 12.75 | 13.3 | - | V |
| Temperature Coefficient of Timing Interval (Monostable) | 50 | - | 100 | ppm/°C |
Key Features
- Two precision timing circuits per package, similar to NA555, NE555, SA555, or SE555 types.
- Astable or monostable operation with external RC timing control.
- TTL-compatible output can sink or source up to 200mA.
- Active pullup or pulldown.
- Trigger and threshold levels adjustable via the control voltage pin (CONT).
- Reset input (RESET) to initiate a new timing cycle.
- Low power consumption with a minimum power-down current of 0.1 µA.
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 NE556D?
The NE556D is a dual precision timer IC manufactured by Texas Instruments, featuring two independent timing circuits similar to the NA555, NE555, SA555, or SE555 types.
- What are the operating modes of the NE556D?
The NE556D can operate in either astable or monostable mode.
- What is the output current capability of the NE556D?
The output can sink or source up to 200mA.
- How is the timing controlled in the NE556D?
The timing is controlled by external resistor-capacitor (RC) circuits and can be modulated by the control voltage pin (CONT).
- What are the trigger and threshold voltage levels for the NE556D?
The trigger level is approximately one-third of the supply voltage, and the threshold level is approximately two-thirds of the supply voltage.
- What is the purpose of the reset input (RESET) in the NE556D?
The reset input (RESET) overrides all other inputs and is used to initiate a new timing cycle.
- What are some common applications of the NE556D?
Common applications include precision timers, pulse-shaping circuits, missing-pulse detectors, pulse-width modulators, and industrial controls.
- What are the available packages for the NE556D?
The NE556D is available in 14-pin SOIC and PDIP packages.
- What is the operating temperature range for the NE556D?
The operating temperature range is from 0°C to 70°C.
- How does the NE556D handle power consumption?
The NE556D has low power consumption with a minimum power-down current of 0.1 µA.
