3-to-8 Line Decoder The TC74ACT138 is an advanced high speed CMOS 3-to-8 LINE DECODER fabricated with silicon gate and double-layer metal wiring C2MOS technology. Features • High speed: tpd = 6.0 ns (typ.) at VCC = 5 V • Low power dissipation: ICC = 8 μA (max) at Ta = 25°C • Compatible with TTL outputs: VIL = 0.8 V (max) VIH = 2.0 V (min) • Symmetrical output impedance: |IOH| = IOL = 24 mA (min) Capability of driving 50 Ω transmission lines. • Balanced propagation delays: tpLH ∼ − tpHL • Pin and function compatible with 74F138
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