MC14555BD

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The MC14555BD device is a programmable timer that provides multiple pulse duration selection, making it an ideal device for applications involving repetitive timing in industrial, commercial and consumer applications. This device is an important building block in applications ranging from process control, industrial machine control, remote terminal unit (RTU) control and home automation.

It is a logic - signal switch, used to switch a signal between two sources. Generally, this type of switch is used in multiplexers, decoders, Flip-flop and other logic circuits. It is specially designed with a variety of features to allow flexibility when used as a timer, or in other circuit applications.

The MC14555BD can be programmed for pulse duration selection, enabling stable operation over long periods of time. Its pinout includes a band-programmable pulse width selector, a stop/start input, an enable output, and a power down pin. The output is composed of a totem-pole type with integrated high current output drive technology for heavy load applications. This device can drive up to 500mA load current and can be powered with a single 5V DC supply.

The circuit operations of the MC14555BD device are based on two flip-flops. The start/stop pin is connected to the Set input of first flip-flop and enable output is connected to the Reset input of second flip-flop, in order to control the timing operation of the device. When the Set input is activated, a ‘1’ is set to the output of the first flip-flop and the enable output will be disconnected, this will start the device operation, the output of the first flip-flop is connected to the Clock input of the second flip-flop and when the second flip-flop is set to ‘1’, the device will keep running until the output waveform of the second flip-flop goes low.

The output waveform of the MC14555BC is programmable for pulse duration selection. It can provide a pulse width ranging from 0.5 to 8.5 seconds. The programmable pulse duration selection is provided by a 4-bit binary coded input, with the combination of 4 pins. The programming of the pulse duration is done by inserting a jumper on selected pins. This will automate the process and reduce the time required to adjust the device as per the user’s requirements.

The power down pin allows the user to further save the power by putting the device in power down mode. The device will enter the power down mode when the power down pin is activated. This will reduce the power consumption of the device when used in applications where the pulse width is not required.

The MC14555BD is a widely used programmable timer and is widely used in automation and industrial applications. Its flexible programming and high output drive capability makes it an ideal choice for applications involving continuous pulse width selection.

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