Overview
The NE556DBR, produced by Texas Instruments, is a dual precision timer integrated circuit. It provides two independent timing circuits, each similar to the NA555, NE555, SA555, or SE555 type, within a single package. This device is capable of operating in both astable and monostable modes, with timing controlled by external resistor-capacitor (RC) networks. The NE556DBR is designed for a wide range of timing applications, offering high precision and versatility.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 16 | V | |
| Operating Temperature (TA) | 0 | 70 | °C | |
| Output Current (IO) | ±200 | mA | ||
| Threshold Voltage Level | 8.8 | 10 | 11.2 | V (at VCC = 15V) |
| Trigger Voltage Level | 4.5 | 5 | 5.6 | V (at VCC = 15V) |
| Reset Voltage Level | 0.3 | 0.7 | 1 | V |
| Low-Level Output Voltage | 0.1 | 0.25 | V (at IOL = 10mA, VCC = 15V) | |
| High-Level Output Voltage | 12.75 | 13.3 | V (at IOH = -100mA, VCC = 15V) | |
| Output Pulse Rise Time | 100 | 300 | ns (CL = 15pF, TA = 25°C) | |
| Output Pulse Fall Time | 100 | 300 | ns (CL = 15pF, TA = 25°C) |
Key Features
- Two independent precision timing circuits per package.
- Astable or monostable operation.
- TTL-compatible output can sink or source up to 200mA.
- Active pullup or pulldown.
- External resistor-capacitor (RC) timing control.
- Control voltage input to adjust threshold and trigger levels.
- Reset input to initiate a new timing cycle.
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 NE556DBR? The NE556DBR is a dual precision timer integrated circuit produced by Texas Instruments.
- What are the operating modes of the NE556DBR? The NE556DBR can operate in both astable and monostable modes.
- What is the supply voltage range for the NE556DBR? The supply voltage range is from 4.5V to 16V.
- What is the maximum output current of the NE556DBR? The maximum output current is ±200mA.
- How is the timing controlled in the NE556DBR? Timing is controlled by external resistor-capacitor (RC) networks.
- What are the typical applications of the NE556DBR? Typical applications include precision timers, pulse-shaping circuits, missing-pulse detectors, and industrial controls.
- What is the temperature range for the NE556DBR? The operating temperature range is from 0°C to 70°C.
- Can the NE556DBR be used in high-frequency applications? For higher-frequency operation above 100kHz, consider using the TLC556 LinCMOS™ Timer instead.
- How many timing circuits are included in the NE556DBR package? The NE556DBR includes two independent timing circuits.
- What is the purpose of the control voltage input in the NE556DBR? The control voltage input is used to adjust the threshold and trigger levels.
