3-8线解码器 3 TO 8 LINE DECODER
DESCRIPTION
The 74VHC238 is an advanced high-speed CMOS 3 TO 8 LINE DECODER fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. If the device is enabled, 3 binary select inputs A, B, and C determine which one of the outputs will go high. If enable input G1 is held low or either G2A or G2B is held high, decoding function is inhibited and all the 8 outputs go to low.
■ HIGH SPEED: tPD = 5.5 ns TYP. at VCC = 5V
■ LOW POWER DISSIPATION: ICC = 4 µA MAX. at TA=25°C
■ HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC MIN.
■ POWER DOWN PROTECTION ON INPUTS
■ SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA MIN
■ BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL
■ OPERATING VOLTAGE RANGE: VCCOPR = 2V to 5.5V
■ PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 238
■ IMPROVED LATCH-UP IMMUNITY