SN74LS21N

邏輯門 Dual 4-Input

SN74LS21NE4

邏輯門 Dual 4-input Positive-AND Gates

SN74LS21NSR

邏輯門 Dual 4-input Positive-AND Gates

SN74LS21NSRE4

邏輯門 Dual 4-input Positive-AND Gates

SN74LS21NSRG4

邏輯門 Dual 4 input pos AND gates

SN74LS221

SN74LS221D

單穩態多諧振蕩器 Dual Mono

SN74LS221DBR

單穩態多諧振蕩器 Dual w/Schmitt-trgr inputs

SN74LS221DBRE4

單穩態多諧振蕩器 Dual w/Schmitt-trgr inputs

SN74LS221DBRG4

單穩態多諧振蕩器 Dual 單穩態多諧振蕩器s

SN74LS221DE4

單穩態多諧振蕩器 Dual w/Schmitt-trgr inputs

SN74LS221DG4

單穩態多諧振蕩器 Dual 單穩態多諧振蕩器s