TC74ACT138FT

The TC74ACT138FT is one of the TC74ACT138 series.The TC74ACT138FT is an advanced high speed CMOS 3-to-8 LINE DECODER fabricated with silicon gate and double-layer metal wiring C2MOS technology.It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation.This device may be used as a level converter for interfacing TTL or NMOS to High Speed CMOS. The inputs are compatible with TTL, NMOS and CMOS output voltage levels.When the device is enabled, 3 Binary Select inputs (A, B and C) determine which one of the outputs ( Y0 - Y7 ) will go low.When enable input G1 is held low or either G2A or G2B is held high, decoding function is inhibited and all outputs go high.G1, G2A , and G2B inputs are provided to ease cascade connection and for use as an address decoder for memory systems.All inputs are equipped with protection circuits against static discharge or transient excess voltage.

Features of the TC74ACT138FT are:(1)High speed: tpd = 6.0 ns (typ.) at VCC = 5 V;(2)Low power dissipation: ICC = 8 A (max) at Ta = 25°C;(3)Compatible with TTL outputs: VIL = 0.8 V (max) VIH = 2.0 V (min);(4)Symmetrical output impedance: |IOH| = IOL = 24 mA (min) Capability of driving 50 transmission lines.;(5)Pin and function compatible with 74F138.

The absolute maximum ratings of the TC74ACT138FT can be summarized as:(1)Supply voltage range:-0.5 to 7.0 V;(2)DC input voltage:-0.5 to VCC + 0.5 V;(3)DC output voltage:-0.5 to VCC + 0.5 V;(4)Input diode current:±20 mA;(5)Output diode current:±50 mA;(6)DC output current:±50 mA;(7)DC VCC/ground current:±200 mA;(8)Power dissipation:500 (DIP) (Note 2)/180 (SOP/TSSOP) mW;(9)Storage temperature:-65 to 150 °C.