SN74LS393NSR

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The SN74LS393NSR is a logic counter / divider device from Texas Instruments which is used in manyindustrial, hobbyist, and educational applications. The device is typically used in microcontroller basedprojects - providing a way to count inputs pulses within a predetermined amount of time, or divide ahigher frequency signal into a lower frequency one.

The SN74LS393NSR device integrates two 4-bit synchronous counters in the same package, referred toas ‘A’ and ‘B’ respectively. These counters contain four octal flip-flops, allowing for a maximum countof 15 (1111 binary) before the counter rolls over back to zero. These flip-flops also drive two decimalcounts (BCD, binary-coded decimal) outputs and several other outputs, giving plenty of bells and whistlesfor the user to take advantage of.

The clock mode (upward and downward counting) of the counter can be set through the ‘RESET’ and‘CLK’ input pins. These pins will either count up or down, depending on their logic level. Additionalfunctionality such as enabling and disabling the counter, setting the reset value, and counting everyother pulse can be controlled from the ‘ENAB’, ‘OUT’, ‘LOAD’, and ‘CLKx2’ input pins.

The SN74LS393NSR device can be used to achieve a variety of counter and divider applications. Forexample, a 3-bit counter can be created with the device by connecting four switches to the ‘RESET’ and‘CLK’ pins, four resistors to the ‘ENAB’ and ‘LOAD’ pins, and an LED to the corresponding BCD output.This rudimentary device can count up or down depending on how the switches are configured.

In addition to this basic functionality, the SN74LS393NSR can be used to divide a higher frequencydigital signal into a lower frequency one. This is accomplished by feeding a square wave signal into the‘CLK’ pin and a control signal (logic 1 or logic 0) into the ‘LOAD’ pin. When the ‘LOAD’ pin is a logic 0,the counter will cycle through the counting process and generate a new output pulse with each cycle. Byconfiguring the ‘SET’ pin to a logic 1, the counter will reset and start again from the beginning of thecounting sequence.

The SN74LS393NSR device can also be used to drive analog displays. By simply substituting a digitaloutput from the counter for an analog signal, the display can cycle through various images or animationswith each clock signal received by the device. This application requires the use of digital-to-analoganalog signal converter for the output of the device.

The SN74LS393NSR is a powerful counter / divider device which can be used to create a variety ofcounter, division and display applications. With its wide range of input / output capabilities, this deviceis an indispensable tool for any microcontroller-based project.

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