NE556DT
Dual general-purpose timer ICs in 14-pin SOIC packaging
Manufacturer： stm
series introduction
# NE556DT Product Series Introduction
## 1. Overview
The NE556DT is a highly versatile and widely used integrated circuit product series that belongs to the timer and oscillator family. It combines the functionality of two 555 timers in a single package, offering enhanced performance and flexibility for a wide range of electronic applications. This dual - timer configuration makes it an ideal choice for designers looking to save board space and reduce component count while achieving complex timing and control functions.
## 2. Key Features
### 2.1 Dual - Timer Design
The most prominent feature of the NE556DT is its dual - timer architecture. Each of the two 555 - style timers within the package can operate independently or in conjunction with the other. This allows for the creation of more complex timing sequences, such as generating two different pulse widths or frequencies simultaneously. For example, in a robotics application, one timer can be used to control the movement speed of a robot's wheels, while the other can be used to time the activation of sensors at specific intervals.
### 2.2 Wide Supply Voltage Range
The NE556DT can operate over a wide supply voltage range, typically from 2 V to 18 V. This wide range makes it suitable for a variety of power sources, including battery - powered devices and standard power supplies. In portable electronics, the ability to work with low - voltage batteries extends the device's battery life, while in industrial applications, it can tolerate the higher voltages commonly found in power distribution systems.
### 2.3 High Output Current Capability
Each timer in the NE556DT can source and sink relatively high currents. The output can typically drive loads up to 200 mA, which is sufficient to directly drive many types of external components such as LEDs, relays, and small motors. This eliminates the need for additional buffer circuits in many cases, simplifying the overall circuit design.
### 2.4 Adjustable Timing
The timing intervals of the NE556DT can be easily adjusted using external resistors and capacitors. By changing the values of these passive components, designers can precisely control the time periods of the output signals, such as the on - time and off - time of a pulse. This adjustability is crucial in applications like frequency generators, where different frequencies need to be generated for various purposes.
### 2.5 Temperature Stability
The NE556DT exhibits good temperature stability, ensuring reliable operation over a wide temperature range. This is important in applications where the device may be exposed to varying environmental conditions, such as automotive electronics or outdoor monitoring systems. The stable performance helps to maintain the accuracy of the timing functions and reduces the risk of malfunctions due to temperature changes.
## 3. Pin Configuration and Functionality
The NE556DT is typically available in a 14 - pin dual in - line package (DIP) or a surface - mount package. Here is a brief description of the key pins and their functions:
### 3.1 Timer 1 Pins
- **Pin 1 (GND)**: Ground reference for the first timer.
- **Pin 2 (Trigger 1)**: A low - level input on this pin triggers the first timer, causing the output to go high.
- **Pin 3 (Output 1)**: The output of the first timer, which can be used to drive external loads.
- **Pin 4 (Reset 1)**: A low - level input on this pin resets the first timer, forcing the output to go low.
- **Pin 5 (Control Voltage 1)**: This pin can be used to externally adjust the threshold and trigger levels of the first timer.
- **Pin 6 (Threshold 1)**: When the voltage on this pin exceeds 2
Images for reference
14-SOIC
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