SN74LS93DRE4

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The SN74LS93DRE4 is a 4-bit binary ripple counter and can be used as a divide-by-two counter and a divide-by-sixteen counter. It is a gate array with D flip-flops as its core, each having an edge-triggered D-type flip-flop composed of four NAND gates. The chip also features four Clock Enable (CE) inputs which can be used in either active high or active low modes, providing a means of putting the flip-flops into a high impedance state so that the counter values are not changed if the Clock Enable input is used.

With its logic inputs and outputs, this counter can be used to control a variety of devices such as encoders, motors, and sequencers. For example, the SN74LS93DRE4 can be used as a divide-by-two counter in a stepper motor driver circuit to routinely move the motor at a certain speed. In addition, the counter can be used to generate specific output sequences when used in conjunction with other digital logic components, such as NAND or NOR gates.

In order to make the SN74LS93DRE4 operational, the first step is to connect the power to the positive supply voltage and the ground pins, which are indicated with a + and a - sign respectively. The clock input pin (CLK), reset input pin (RST) and Clock Enable pins (CEx) can then be connected to the digital signals that will be used to control the counter. Once the necessary connections have been made to the counter, the counter will begin to count when its clock input is applied with a rising edge.

When the counter reaches the maximum count of 15, it is reset to a count of 0 by receiving a pulse on the RST pin. The CE1 and CE4 pins can be used to put the flip-flops of the counter into a high impedance state, meaning that the counters will not be affected by any clock input until the CEx pin is reset to logic high. In addition, the SN74LS93DRE4 possesses an asynchronous clear input (CLR) which can be used to clear the counter without the need for a reset pulse.

The SN74LS93DRE4 is designed to be used in a variety of applications, such as in digital clocks, counters and dividers, frequency dividers, encoders, and motor controls. The counter can be also used in conjunction with digital logic components to form more complex digital systems. This low power 4-bit ripple counter is suitable for use in most TTL control systems, and offers the ability to handle higher input and output rates due to its wide power supply voltage range.

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