Overview
The NE556DR, produced by Texas Instruments, is a dual precision timer integrated circuit. It contains two independent timing circuits, each similar to the NE555 timer, in a single 14-pin package. This device is designed for general-purpose timing applications and can operate in both astable and monostable modes. The NE556DR is versatile and can be used in a wide range of applications, from precision timers and pulse-shaping circuits to missing-pulse detectors and pulse-width modulators.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | - | 16 | V |
| Operating Temperature (TA) | -40 | - | 85 | °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 |
| Discharge Switch Off-State Current | 20 | - | 100 | nA |
| 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
- Designed to be interchangeable with Signetics NE556, SA556, and SE556
- Precision timers from microseconds to hours
- Control voltage pin (CONT) for adjusting trigger and threshold levels
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 NE556DR? The NE556DR is a dual precision timer integrated circuit produced by Texas Instruments.
- What are the operating modes of the NE556DR? The NE556DR can operate in both astable and monostable modes.
- What is the supply voltage range for the NE556DR? The supply voltage range is from 4.5V to 16V.
- What is the operating temperature range for the NE556DR? The operating temperature range is from -40°C to 85°C.
- How much current can the output of the NE556DR sink or source? The output can sink or source up to 200mA.
- What are some common applications of the NE556DR? Common applications include precision timers, pulse-shaping circuits, missing-pulse detectors, and pulse-width modulators.
- Can the NE556DR be used in high-frequency applications? For frequencies above 100kHz, it is recommended to use the TLC556 LinCMOS™ Timer instead.
- How do the trigger and threshold levels work in the NE556DR? The trigger level is approximately one-third of the supply voltage, and the threshold level is approximately two-thirds of the supply voltage. These levels can be adjusted using the control voltage pin (CONT).
- What is the function of the reset input in the NE556DR? The reset input overrides all other inputs and is used to initiate a new timing cycle.
- What are the package options for the NE556DR? The NE556DR is available in SOIC (D), PDIP (N), SSOP (DB), and SO (NS) packages.
