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.)

74VHCT257A属于集成电路（IC） > 信号开关，多路复用器，解码器。意法半导体（ST）集团制造生产的74VHCT257A信号开关，多路复用器，解码器逻辑型信号开关、多路复用器和编码器 IC 可用于对以数字格式表示数据的电信号进行路由和选择。这些器件与设计用于模拟信号的类似产品有所不同，它们保留的信息表示为两个电状态之一，而不是两个外部界限内的无穷变化量。