Overview of SN74LS169B, SN54S169 Binary Counters
The SN74LS169B and SN54S169 presented in this datasheet are synchronous 4-bit up/down binary counters designed by Texas Instruments. These devices are notable for their fully synchronous operation, facilitating high-speed counting and programming in applications where precision timing is crucial.
Key Features
These binary counters boast a range of features to enhance performance and usability:
- Programmable look-ahead for efficient, high-speed counting
- Cascade capability with a carry output for extending bit-count without a need for additional gating
- Independent clock circuitry to ensure stable and precise operations
- Internal look-ahead and synchronous load operation enhances the functionality during complex counting tasks
Functional Capabilities
Operationally, the counters can easily switch between counting up and down, based on the level of the up/down input signal, enabling versatile usage in different counting applications. All flip-flops within the counters are clocked simultaneously, which leads to unified and spike-free output changes – a stark contrast to the asynchronous counters that might suffer from output counting spikes.
The counters are programmable, allowing the outputs to be preset to desired levels. Synchronous loading is enabled via a specific input, which ensures alignment with the data inputs following a clock pulse. Moreover, an efficient carry look-ahead feature permits seamless cascading for broader synchronous counting applications without any need for extra gating. This is primarily facilitated by two count-enable inputs and one carry output.
Enhancing the design convenience, all inputs feature diode-clamping which minimizes transmission-line effects, simplifying system design.
Design Specifications
Both the ‘LS169B and ‘S169 variants support a typical maximum counting clock frequency of 35MHz (‘LS169B) and 55MHz (‘S169), with typical power dissipation standing at 500 mW for ‘S169 and 300 mW for ‘LS169B.
Product Information and Quality Assurance
The datasheet asserts the contemporaneousness of the product information with the caveat that products adhere to the specifications guaranteed by Texas Instruments’ standard warranty. It also notes that production processing may exclude testing of all parameters.
Logic Symbol and Packaging
The counters come in multiple package options including D, J, N, and W with a distinct logic symbol that complies with ANSII/IEEE Std. 91-1984 and IEC Publication 617-12. This section of the datasheet provides a visual depiction of the logic symbol, indicating various features such as load, count, and up/down inputs along with the corresponding pin numbers for each package type.
Datasheet Control
The information provided is specific to the models SN74LS169B, and SN54S169, with the datasheet reference number SDLS134 and a revision status dated March 1988, building upon its initial release in October 1976.
References:
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