型号:GD74HC298
GD74HC32
GD74HC34
GD74HC368
GD74HC58
GD74HC646
GD74HCT10
GD74HCT125
GD74HCT20
GD74HCT241
GD74HCT27
GD74HCT368
GD74HCT646
GD74LS05
GD74LS05J
GD74LS07
GD74LS112
GD74LS123J/B
GD74LS138
GD74LS138J
GD74LS139
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