SA556NG4

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	555 Type, Timer/Oscillator (Dual)
Count:	--
Frequency:	100kHz
Voltage - Supply:	4.5 V ~ 16 V
Current - Supply:	20mA
Operating Temperature:	-40°C ~ 85°C
Package / Case:	14-DIP (0.300", 7.62mm)
Supplier Device Package:	14-PDIP
Mounting Type:	Through Hole
Base Part Number:	SA556

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Introduction The SA556NG4 is a Programmable Timers and Oscillators device designed by Texas Instruments (TI). The SA556NG4 is suitable for timing and frequency applications, enabling designers to rapidly create time bases. This device is commonly used in automotive and industrial applications requiring safe, repeatable, and reliable timing sequences. Features/Benefits The SA556NG4 features a special electronic switch (ETS) built in which helps prevent simultaneous switching of timing signals. This feature helps to ensure reliable timing and reduce the possibility of false triggering, which is particularly useful in safety-critical applications. Furthermore, the device can be configured in two operating modes: monostable (one-shot) and astable (oscillator), where the timer remains ’on’ for a period referenced by its intermittent output of pulses. Additionally, the device is resistant to shock and temperature, offering reliable performance in harsh environments. Applications The SA556NG4 is generally used in automotive and industrial applications requiring reliable timing sequences in hazardous environments. Examples of applications for the SA556NG4 include frequency and pulse monitoring, motor speed control and power supply monitoring. The device is also suitable for use in automotive sensors, airbag modules and heaters. Working Principle The SA556NG4 utilizes a special electronic switch (ETS) built into the device. This switch helps prevent simultaneous switching of timing signals and ensures reliable timing. The device can be configured into two operating modes: monostable and astable. In the monostable mode, the timer activates by a transition (either high-to-low, or low-to-high) of the input signal. A transition on the input signal becomes a pulse on the output enable transition. During this transition, the internal capacitor is discharged, then timing is initiated when the threshold voltage is reached. With the astable operating mode, the transition on the input signal triggers an iterative process, bringing the internal capacitor back to its original voltage level. An output pulse that matches the input pulse is generated, and the output enable signal will be returned to its original state. This process is repeated until the timer is disabled, then the output enable signal switches back to its original state and the output pulse vanishes. Conclusion The SEAL556NG4 is a Programmable Timers and Oscillators device designed by Texas Instruments. It features a special electronic switch which prevents simultaneous switching of timing signals, enabling it to perform reliably in hazardous environments. This device is suitable for applications such as frequency and pulse monitoring, motor speed control and power supply monitoring. The working principle of the SA556NG4 involves the use of an internal capacitor, which is activated when an input pulse is received. Upon activation, the capacitor behaves differently depending on the operating mode selected; monostable or astable.

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