SN74LS593DW

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The SN74LS593DW is a 4-bit binary synchronous programmable counter. It is designed to provide counters, dividers and other sequencer logic within a 16-pin dual-in-line package (DIP). This device contains two separate 4-bit counters that can be clocked either from an internal oscillator or from an external signal. It also features input and output functions that are intended to create shift-register and other complex logic routines.

The SN74LS593DW has a wide range of possible application fields. It is mostly used in embedded systems or analog to digital converters. In the latter case, this device is typically used to divide down a high-frequency reference clock to a lower frequency clock with a programmable divisor. In systems with a fixed clock, a 4-bit counter is typically used to sequence through a series of address words. This enables multiple memories to be selected in the same address space.

The SN74LS593DW is a versatile device that can operate in a number of different modes. In its most simple mode, it can operate as a simple 4-bit up-counter. The counter can be clocked either from the on-chip oscillator or from an external source. The device can also be programmed with a programmable divisor, allowing the external clock input frequency to be divided down to a user-specified frequency. Furthermore, the device can be programmed to operate as a 2-bit or 3-bit down-counter.

In order to implement complex logic routines, the SN74LS593DW also features active-low synchronous reset and carry functions. When the counter reaches its maximum value, an active-low carry output will be TTL-compatible when the preset inputs are connected to a logic high. The active-low synchronous reset is triggered by a logic high on all four preset inputs, regardless of the clock input.

In order to get the most out of the SN74LS593DW, the designer should take advantage of the device’s wide range of application fields and its versatile mode-programming features. When designing for embedded systems, this device can be used to sequence through a series of address words, thereby enabling multiple related memories to be selected simultaneously without the need for multiple address bits. Additionally, in analog-to-digital converter systems, the device can be used as a frequency divider circuit, allowing the reference clock to be divided down to a fraction of the original frequency. Additionally, it can be used to generate complex shift-register and other complex logic routines.

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