SN74AS163DRE4

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SN74AS163DRE4 Application Field and Working Principle

The SN74AS163DRE4 is a 4-bit synchronous Binary Counter with Synchronous Reset Counter (SRC) developed by Texas Instruments for logic devices. It is typically used in applications such as frequency divide-by-20 circuits, frequency dividers operating with Schmitt trigger oscillators, data multiplexers and partial address decoding. The SN74AS163DRE4 is based on high-speed BiCMOS technology, and features a wide operating range of 2.7 V to 5.5 V, high speed capability with a maximum toggle frequency of 20 MHz, and low power consumption. Furthermore, this device is designed with a synchronous reset which eliminates any unwanted propagation delays associated with asynchronous reset.

In order to understand the use of the SN74AS163DRE4 in an application, it is necessary to first understand its working principle. The SN74AS163DRE4 consists of an asynchronous presettable 4-bit binary counter with a synchronous reset. An internal oscillator provides the clock pulses for the counter. The SN74AS163DRE4 is enabled by the Clock Enable (CE) input. CE is active high, so the counters must be enabled by a logic high input. The Data Input (DIN) is used to preset the counter. DIN is asynchronous to the clock signals and is enabled by the Preset Enable (PE) signal. PE is active high, so the counters must be enabled by a logic high input. The asynchronous reset signal (Reset) is applied to the Reset (R) input and is used to reset the individual stages of the counter. Reset is enabled by the Reset Enable (RE) signal. The Q outputs are the outputs of each stage of the Counter while a Qbar output is provided as the compliment of Q0.

In a frequency divider application, the SN74AS163DRE4 can be used to divide an incoming signal frequency by either 2 or 10. This is done by connecting the Clock Input (CLK) of the SN74AS163DRE4 to the frequency signal and setting the CE, PE and RE inputs to high. The SN74AS163DRE4 will then cycle through its states and the divided signal frequency will be available at the Q outputs. The Q0 output is the divided signal frequency and the remaining Q outputs represent the count of each stage. By setting the DIN input low, the counter will be preset to its initial state. The RE signal is used to reset the individual stages of the counter.

In multiplexer applications, the SN74AS163DRE4 can be used to control the selection of data. This is done by connecting the Clock Input (CLK) of the SN74AS163DRE4 to the control signal and setting the CE, PE and RE inputs to high. The SN74AS163DRE4 will then cycle through its states. The Q0 output can then be used to control the multiplexing of data while the remaining Q outputs represent the address of each stage. The DIN input can be used to preset the counter while the reset input can be used to reset the counter.

In address decoding applications, the SN74AS163DRE4 can be used to decode a given address. This is done by connecting the Clock Input (CLK) of the SN74AS163DRE4 to the address signal and setting the CE, PE and RE inputs to high. The SN74AS163DRE4 will then cycle through its states. The Q0 output can then be used to control the address decode while the remaining Q outputs represent the address of each stage. The DIN input can be used to preset the counter while the reset input can be used to reset the counter.

The SN74AS163DRE4 is a versatile, high-speed synchronous counter with synchronous reset counter designed to meet the needs of logic applications. It is easy to incorporate into an application and offers a wide variety of features and benefits for the user. Its high-speed capability and low power consumption make it ideal for frequency division and data multiplexer applications, and its onboard synchronous reset eliminates any unwanted propagation delays associated with asynchronous reset.

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