SDYU001AC June 2015 – November 2025 LSF0101 , LSF0102 , LSF0108 , SN74GTL2014 , SN74HC245 , SN74LS07 , SN74LV123A , SN74LV1T08 , SN74LV1T34 , SN74LV244AT , SN74LV245A , SN74LV4T125 , SN74LVC14A , SN74LVC1G08 , SN74LVC1G125 , SN74LVC245A , SN74LVTH125 , SN74LVTH16244A , SN74LVTH16245A , SN74LVTH245A
- 1
- Trademarks
- 1Introduction
- 2Logic Overview
-
3Logic Families
- 3.1 Legacy Logic
- 3.2 AC(T): Advanced CMOS
- 3.3 AHC(T): Advanced High-Speed CMOS
- 3.4 ALVC: Advanced Low-Voltage CMOS
- 3.5 AUC: Advanced Ultra Low Voltage CMOS
- 3.6 AUP: Advanced Ultra-Low Power
- 3.7 AVC: Advanced Very-Low-Voltage CMOS
- 3.8 HC(T): High-Speed CMOS
- 3.9 HCS: High-Speed CMOS with Schmitt-trigger inputs
- 3.10 LV-A(T): Low Voltage
- 3.11 LVxT: Low-Voltage CMOS Single Supply Translating Logic
- 3.12 LVC: Low-Voltage CMOS
- 3.13 LVT: Low-Voltage BiCMOS Technology
- 4Appendix A: Logic Packages
- 5Appendix B: Competitor Family Cross Reference
- 6Appendix C: Logic Part Number Naming Conventions
- 7Appendix D: Standard Logic Functions
- 8Revision History
2.2 Comparison of Switching Standards
The following figures provide a comprehensive comparison of different I/O standards for logic devices. Figure 2-2 illustrates the evolution of 5V I/O standards, from traditional TTL devices to advanced CMOS and Schmitt-trigger input devices, highlighting the differences in voltage thresholds and output levels.
Figure 2-3 provides a detailed comparison of multiple voltage standards, including 5V, 3.3V, 2.5V, 1.8V, 1.2V, and 0.8V, enabling easy evaluation and selection of the most appropriate I/O standard for a given application. The graphics show the minimum switching levels (VIH and VIL) for normal operation, as well as the approximate switching threshold (Vt) and output levels (VOH and VOL) for each supply voltage (VCC) specified, enabling designers to make informed decisions about logic device selection.
Figure 2-2 5V Logic I/O Standards
Figure 2-3 CMOS Logic I/O
Standards