SN74LVC244APW SN74LVC244APW(LC244A) SN74LVC244APWE4 SN74LVC244APWG4 SN74LVC244APWLE SN74LVC244APWR SN74LVC244APWR . SN74LVC244APWR IC SN74LVC244APWR TSSOP20 SN74LVC244APWR 逻辑IC