74VHCT257ATTR集成電路（IC）的信號開關多路復用器解碼器規(guī)格書PDF中文資料

74VHCT257ATTR屬于集成電路（IC）的信號開關多路復用器解碼器。由意法半導體集團制造生產(chǎn)的74VHCT257ATTR信號開關，多路復用器，解碼器邏輯型信號開關、多路復用器和編碼器 IC 可用于對以數(shù)字格式表示數(shù)據(jù)的電信號進行路由和選擇。這些器件與設計用于模擬信號的類似產(chǎn)品有所不同，它們保留的信息表示為兩個電狀態(tài)之一，而不是兩個外部界限內(nèi)的無窮變化量。

DESCRIPTION

The 74VHCT257A is an advanced high-speed CMOS QUAD 2 CHANNEL MULTIPLEXER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology.

■ HIGH SPEED: tPD = 5.8 ns (TYP.) at VCC =5V

■ LOWPOWER DISSIPATION: ICC = 4 μA (MAX.) at TA = 25 °C

■ COMPATIBLEWITH TTL OUTPUTS: VIH = 2V (MIN), VIL = 0.8V(MAX)

■ POWER DOWN PROTECTION ON INPUTS & OUTPUTS

■ SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN)

■ BALANCEDPROPAGATIONDELAYS: tPLH ? tPHL

■ OPERATINGVOLTAGERANGE: VCC (OPR) = 4.5Vto 5.5V

■ PIN AND FUNCTION COMPATIBLE WITH 74 SERIES257

■ IMPROVEDLATCH-UP IMMUNITY

■ LOWNOISE: VOLP =0.8V (Max.)