SN74AS161DE4

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The SN74AS161DE4 is a 4-bit asynchronous binary synchronous reset counter that is part of the SNx4AS family of devices from Texas Instruments. These devices are designed to handle the needs of high-transition-rate applications, providing up to 4-bit ripple counters up to 128-bit synchronous counters. The SN74AS161DE4 is a synchronous binary counter which contains four D-type flip-flops that are clocked simultaneously on the rising edge of the clock (CP) input and is reset with logic “1” on the reset (R) input. The SN74AS161DE4 can be used in a variety of counter applications from low-to-high frequency, pulse-width-modulation, up/down and frequency-division applications.

SN74AS161DE4 is available in a variety of package types including a 14-pin plastic dual-in-line package (PDIP), a 14-pin plastic small outline package (SOIC) and a 14-pin ceramic leadless chip carrier (CLCC). The PDIP and SOIC packages are available in commercial and industrial temperature ranges while the CLCC is available in only an industrial temperature range. The SN74AS161DE4 features a wide power supply voltage range of 3V to 15V and is capable of receiving Clock (CP) and Reset (R) inputs from either the same logic supply or from different logic supplies. Current consumption for the SN74AS161DE4 is typically 1.0mA.

The SN74AS161DE4 is designed to be a 4-bit synchronous binary counter. The synchronous feature allows all four flip-flops to be clocked at the same time from the CP input. The output from each flip-flop, QA–QD, is connected to the D input of the next higher flip-flop in the chain. Inputs A–D are common to all four flip-flops and are used to reset each flip-flop when the reset input is active. When reset is low the flip-flops count up on the falling edge of the CP input, while when reset is high the flip-flops are reset to a known initial state (i.e., all output stages are low).

The SN74AS161DE4 is designed for use in a variety of high-transition-rate applications. One of the most common uses for the SN74AS161DE4 is in pulse-width-modulation applications. This type of application requires an asynchronous reset, which the SN74AS161DE4 supports. In such applications, the CP and R inputs will be connected to the same logic supply and the CLK input connected to the signal that will be used to modulate the pulse width.

Another common application for the SN74AS161DE4 is in frequency-division applications. In this application, the CP and R inputs are connected to the same logic supply, but the CLK input is connected to a signal that is input at a particular rate. The output of the SN74AS161DE4 is then connected to a frequency divider circuit that will divide the input signal by 2n (where n is the number of stages in the counter). This type of application is often used in digital frequency synthesis or in clock rate reduction applications.

The SN74AS161DE4 can also be used in applications that require an up/down counter. In this type of application, the CP, R, and A–D inputs are connected to the same logic supply and the UP/DOWN input is connected to a signal that will be used to indicate whether the counter should count up or down. The output of the SN74AS161DE4 is then connected to a counter that will count up or down depending on the value of the UP/DOWN signal. These types of applications are commonly used in digital frequency synthesis and rate reduction applications.

The SN74AS161DE4 is a versatile device and can be used in a variety of counter applications. It features a wide power supply voltage range and can be clocked from either the same logic supply or from different logic supplies. The SN74AS161DE4 is available in a variety of package types and can be used in pulse-width-modulation, frequency-division and up/down counter applications.

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