These devices SN54F21 SN74F21 contain two independent 4-input AND Gates They perform the Boolean functions Y = A B C D or Y = A + B + C + D in positive Logic The SN54F21 is characterized for operation over the full military temperature range of 55C to 125C. The SN74F21 is characterized for operation from 0C to 70C. By Texas Instruments
SN54F21 's PackagesSN54F21 's pdf datasheet

SN54F21 Pinout, Pinouts
SN54F21 pinout,Pin out
This is one package pinout of SN54F21,If you need more pinouts please download SN54F21's pdf datasheet.

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