74VHC14屬于集成電路（IC）的門反相器。由意法半導(dǎo)體集團(tuán)制造生產(chǎn)的74VHC14門和反相器邏輯柵極和逆變器系列中的產(chǎn)品對(duì)單個(gè)邏輯信號(hào)執(zhí)行基本邏輯運(yùn)算（例如 AND、NOT、OR 等）。與觸發(fā)器不同，它們不能夠存儲(chǔ)信息，不會(huì)對(duì)提供給其輸入的信號(hào)立即做出響應(yīng)。雖然早就被集成電路實(shí)施形式所取代，以用于實(shí)現(xiàn)復(fù)雜功能，但分立柵極仍可在僅需要非常簡(jiǎn)單邏輯功能的情況下使用。

描述 Description

The 74VHC14 is an advanced high-speed CMOS HEX SCHMITT inverter fabricated with submicron silicon gate and double-layer metal wiring C2MOS technology.

The internal circuit is composed of 3 stages including buffer output, which enables high noise immunity and stable output.

Power down protection is provided on all inputs and 0 to 7V can be accepted on inputs with no regard to the supply voltage. This device can be used to interface 5V to 3V.

Pin configuration and function are the same as those of the 74VHC04 but the 74VHC14 has hysteresis.

This together with its schmitt trigger function allows it to be used on line receivers with slow rise/fall input signals.

All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.

特性 Features

■ High speed: tPD = 5.5ns (typ.) at VCC = 5V

■ Low power dissipation:

ICC = 2 μA (Max.) at TA = 25°C

■ Typical hysteresis: Vh = 1V at VCC = 4.5V

■ Power down protection on inputs

■ Symmetrical output impedance:

|IOH| = IOL = 8 mA (Min)

■ Balanced propagation delays: tPLH ? tPHL

■ Operating voltage range:

■ VCC(Opr) = 2V to 5.5V

■ Pin and function compatible with 74 series 14

■ Improved latch-up immunity

■ Low noise: VOLP = 0.8V (Max.)