Overview
The SA556N, produced by Texas Instruments, is a dual monolithic timing circuit that offers high stability and precision in timing applications. This device is part of the 556 family, which includes the NE556 and SE556, and is designed to provide two independent timing circuits in a single package. The SA556N operates in both astable and monostable modes, making it versatile for a wide range of timing and oscillation needs.
Key Specifications
| Parameter | Unit | Min | Max | |
|---|---|---|---|---|
| VCC Supply Voltage | V | 4.5 | - | 16 |
| Operating Free-Air Temperature | °C | -40 | - | 105 |
| Output Current | mA | -200 | - | 200 |
| Threshold Voltage Level (VCC = 15V) | V | 8.8 | 10 | 11.2 |
| Trigger Voltage Level (VCC = 15V) | V | 4.5 | 5 | 5.6 |
| Low-Level Output Voltage (VCC = 15V, IOL = 10mA) | V | 0.1 | 0.25 | - |
| High-Level Output Voltage (VCC = 15V, IOH = -100mA) | V | 12.75 | 13.3 | - |
| Output Pulse Rise Time (CL = 15pF, TA = 25°C) | ns | 100 | 300 | - |
| Output Pulse Fall Time (CL = 15pF, TA = 25°C) | ns | 100 | 300 | - |
Key Features
- Two independent timing circuits per package, similar to the NA555, NE555, SA555, or SE555 type.
- Operates in both astable and monostable modes.
- TTL-compatible output can source or sink up to 200 mA.
- Active pullup or pulldown capability.
- Adjustable duty cycle.
- Temperature stability of 0.005% per °C.
- Maximum operating frequency greater than 500 kHz.
- Low turn-off time.
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 are the operating temperature ranges for the SA556N?
The SA556N operates over a temperature range of -40°C to +105°C.
- What are the supply voltage requirements for the SA556N?
The SA556N requires a supply voltage between 4.5V and 16V.
- Can the SA556N operate in both astable and monostable modes?
- What is the maximum output current of the SA556N?
The SA556N can source or sink up to 200 mA.
- How is the timing interval controlled in the SA556N?
The timing interval is controlled by external resistor-capacitor (RC) timing circuits and can be adjusted using the control voltage pin (CONT).
- What are some common applications of the SA556N?
- What is the maximum operating frequency of the SA556N?
The SA556N can operate at frequencies greater than 500 kHz.
- How does the SA556N handle temperature stability?
The SA556N has a temperature stability of 0.005% per °C.
- What is the purpose of the reset input (RESET) in the SA556N?
The reset input (RESET) overrides all other inputs and is used to initiate a new timing cycle, resetting the flip-flop and setting the output low).
- How should unused inputs be handled in the SA556N?
Unused inputs should be tied to an appropriate logic level to prevent false triggering).
