# Timing Library Format

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**Timing Library Format** (abbreviated **TLF**) is a file format used by [electronic design automation](/source/Electronic_design_automation) tools. A TLF file is a [text file](/source/Text_file) in nature[1] and contains timing and logical information about a collection of cells ([circuit elements](/source/Circuit_element)).

The TLF file contains information on the timing and power parameters of the cell library. It is used to determine delays of [I/O ports](/source/I%2FO_port) and interconnects of the final design.

## References

1. **[^](#cite_ref-1)** ["Timing Library Format Reference"](https://web.archive.org/web/20210506174636/https://www.ee.virginia.edu/~mrs8n/soc/SynthesisTutorials/ct_tlfref.pdf) (PDF). [Cadence Design Systems](/source/Cadence_Design_Systems). October 2000. Archived from [the original](https://www.ee.virginia.edu/~mrs8n/soc/SynthesisTutorials/ct_tlfref.pdf) (PDF) on 2021-05-06. Retrieved 6 May 2021.

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