SN74ALS193ADR

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The SN74ALS193ADR is a monolithic counter device manufactured by Texas Instruments, Inc. (TI). It falls under the Logic - Counters, Dividers category and represents a 4-bit bidirectional shift register for use in high-speed binary-coded-decimal (BCD) or binary applications. The device is capable of counting in either direction and has a presettable reset count. It is fabricated with TI’s advanced low-power BiMOS process. The SN74ALS193ADR is part of the TI Logic and Interface Product family, which provides support components designed to simplify the design of today’s software-driven digital systems.

The SN74ALS193ADR is a synchronous logic device and its basic operation consists of a counter that counts in a single direction based on the state of the count clock signal applied to the clock input (CL). When the CL is low, the counter may be preset to the desired count. When CL goes high, the count output (Q) goes low. When CL goes low again, the next count is stored. The counter will continue to count in this fashion until the count reaches its maximum value of 15 in binary or 9 in BCD, upon which it will reset itself to zero. It is also possible to force a reset count by applying a signal to the RESET input.

The SN74ALS193ADR can be used in many applications, such as counters and frequency dividers. In a counter application, the device is initialized to the desired initial count by asserting the RESET for a brief period of time. The counter advances the output count by one each time the CL signal goes low, cycling through the entire sequence of 0-15 or 0-9 in BCD (depending on the application) before returning to zero. In a frequency divider application, the clock signal to the CL pin can be a higher-frequency signal than the output Q signal. Each time a set number of CL pulses have been counted, the output Q will toggle. The SN74ALS193ADR is also used in digital logic devices, such as multiplexers, to provide a way to select which of several circuits will be connected to an output.

The SN74ALS193ADR is extremely reliable, with a mean time between failure (MTBF) of about 1 million hours. It also has very good signal-to-noise ratio and no degradation of output due to environmental factors. The device is available in a variety of packages and can operate over a wide range of temperatures, from -55°C to +125°C. In short, the SN74ALS193ADR offers a simple and easy way to implement rapid, low-power, and reliable counting and frequency division functions. It is an ideal choice for use in high-speed BCD or binary applications.

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