SN74LS21DR datasheet by Texas Instruments

SN74LS21DR Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of the SN74LS21DR?
  The maximum operating frequency of the SN74LS21DR is 25 MHz.
• Is the SN74LS21DR compatible with 3.3V or 5V logic?
  The SN74LS21DR is compatible with 5V logic, but it is not recommended for use with 3.3V logic due to its limited output drive capability.
• What is the power consumption of the SN74LS21DR?
  The typical power consumption of the SN74LS21DR is 20 mW, but it can vary depending on the operating frequency and load conditions.
• Can the SN74LS21DR be used in a high-temperature environment?
  The SN74LS21DR is rated for operation up to 70°C, but it can be used in high-temperature environments up to 85°C with some derating of the operating frequency.
• Is the SN74LS21DR radiation-hardened?
  No, the SN74LS21DR is not radiation-hardened and is not suitable for use in high-radiation environments.