TC74VHC238F

The TC74VHC238F is one of the TC74VHC238 series.The TC74VHC238F is an advanced high speed CMOS 3-to-8 DECODER fabricated with silicon gate C2MOS technology.It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation.When the device is enabled, 3 Binary Select inputs (A, B andC) determine which one of the outputs (Y0-Y7) will go High.When enable input G1 is held low or either G2A or G2B is held high, decoding function is inhibited and all outputs go Low.G1 G2A , and G2B inputs are provided to ease cascade connection and for use as an address decoder for memory systems.An input protection circuit ensures that 0 to 5.5 V can be applied to the input pins without regard to the supply voltage.This device can be used to interface 5 to 3 V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages.

Features of the TC74VHC238F are:(1)High speed: tpd = 5.5 ns (typ.) at VCC = 5 V;(2)Low power dissipation: ICC = 4 A (max) at Ta = 25°C;(3)High noise immunity: VNIH = VNIL = 28% VCC (min);(4)Power down protection is provided on all inputs;(5)Wide operating voltage range: VCC (opr) = 2 to 5.5 V;(6)Pin and function compatible with 74ALS238.

The absolute maximum ratings of the TC74VHC238F can be summarized as:(1)Supply voltage range:-0.5 to 7.0 V;(2)DC input voltage:-0.5 to 7.0 V;(3)DC output voltage:-0.5 to VCC + 0.5 V;(4)Input diode current:-20 mA;(5)Output diode current:±20 mA;(6)DC output current:±25 mA;(7)DC VCC/ground current:±75 mA;(8)Power dissipation:180 mW;(9)Storage temperature:-65 to 150 °C.