SN74AS867DWE4

Timing:	Synchronous
Base Part Number:	74AS867
Supplier Device Package:	24-SOIC
Package / Case:	24-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
Voltage - Supply:	4.5V ~ 5.5V
Trigger Type:	Positive Edge
Count Rate:	50MHz
Series:	74AS
Reset:	Asynchronous
Number of Bits per Element:	8
Number of Elements:	1
Direction:	Up, Down
Logic Type:	Binary Counter
Part Status:	Active
Packaging:	Tube

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Introduction to the SN74AS867DWE4

The SN74AS867DWE4 is a CMOS synchronous 8-bit binary counter with reset, manufactured by Texas Instruments. This device has several popular applications, as it can be used to measure frequency, enable ripple counters, and count digital events. The 74AS867DWE4 also contains a diode logic with a recirculation and reset logic. This chip is classified as belonging to the category of logic —counters, dividers, or frequency dividers.

Application

The SN74AS867DWE4 is a universal device which is suitable for use in various applications, such as, precision frequency dividers and digitally controlled applications. This device is often used in waveform generators, as its logic design enables it to form a timely waveform by dividing the frequency or signals applied. In this application, the device is used as a frequency divider as its output carries a signal at a pre-programmed rate. In addition to this, this device also finds its application in various digital integrated circuits such as microcontrollers, video displays, and volatile memory chips. This device is also widely used in applications related to digital pulse shaping and pulse width-modulation.

Features and Specifications

The SN74AS867DWE4 is a synchronous 8-bit binary counter with reset. It is assembled in an 16-pin plastic dual-in-line package (PDIP). This device has five modes of operation -- Cascade, Parallel, Master Reset, Reset and Normal Counting. It also has an active LOW fault/ latch reset, synchronous parallel data loading, synchronous Master Reset and power up reset. The supply voltage required ranges from 4.75V to 5.25V and the operating temperature range is from 0°C to 70°C.

Working Principle

The SN74AS867DWE4 works on the principle of binary counting. The device functions as an 8-bit counter which can count from 0 to 255. The count will increment by one on every low-to-high transition of the clock input. The device has an active LOW fault/ latch reset which clears the count to a value of 0 when a low active signal is applied on the reset pin. The synchronous parallel data loading function helps to load a binary data directly into the counter. The device also has a synchronous Master Reset which clears the count to a value of 0 when a low active signal is applied on the master reset pin.

Conclusion

The SN74AS867DWE4 is a CMOS synchronous 8-bit binary counter with reset, manufactured by Texas Instruments. This device has several popular applications, as it can be used to measure frequency, enable ripple counters, and count digital events. The 74AS867DWE4 is classified as belonging to the category of logic - counters, dividers, or frequency dividers. This device is suitable for a variety of applications such as, waveform generation, frequency division and pulse shaping. The SN74AS867DWE4 works on the principle of binary counting and has features like active low fault/ latch reset and synchronous parallel data loading.

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