TEXAS INSTRUMENTS
与非门, 74S20, 4输入, 20mA, 4.75V至5.25V, DIP-14
或非门, 74S260, 5输入, 20mA, 4.75V至5.25V, SOIC-14
或门, 74S32, 2输入, 20 mA, 4.75 V至5.25 V, DIP-14