DESCRIPTION The 74VHCT20A is an advanced high-speed CMOS DUAL 4-INPUT NAND GATE fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. The internal circuit is composed of 3 stages including buffer output, which provides high noise immunity and stable output. ■ HIGH SPEED: tPD = 5 ns (TYP.) at VCC = 5V ■ LOW POWER DISSIPATION: ICC = 2 µA (MAX.) at TA=25°C ■ COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN.), VIL = 0.8V (MAX) ■ POWER DOWN PROTECTION ON INPUTS & OUTPUTS ■ SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN) ■ BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL ■ OPERATING VOLTAGE RANGE: VCC(OPR) = 4.5V to 5.5V ■ PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 20 ■ IMPROVED LATCH-UP IMMUNITY
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