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I74F257AD-T 
品牌： NXP(恩智浦)
描述：
Quad 2-line to 1-line selector/multiplexer, non-inverting (3-State) - Description: Quad 2-Input Multiplexer (3-State) ; Logic switching levels: TTL ; Number of pins: 16 ; Output drive capability: -3/+24 mA ; Propagation delay: 4.5 ns; Voltage: 4.5-5.5 V
Quad 2-line to 1-line selector/multiplexer, non-inverting (3-State) - Description: Quad 2-Input Multiplexer (3-State) ; Logic switching levels: TTL ; Number of pins: 16 ; Output drive capability: -3/+24 mA ; Propagation delay: 4.5 ns; Voltage: 4.5-5.5 V
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