Octal Bus Buffer

TC74ACT240P/F/FT Inverted, 3-State Outputs

TC74ACT244P/F/FT Non-Inverted, 3-State Outputs

The TC74ACT240 and 244 are advanced high speed CMOS OCTAL BUS BUFFERs fabricated with silicon gate and double-layer metal wiring C2 MOS technology. They achieve the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation.

The 74ACT240 is an inverting 3-state buffer while the 74ACT244 is non-inverting. Both devices have two active-low output enables. These devices are designed to be used in such applications as 3-state memory address drivers. All inputs are equipped with protection circuits against static

discharge or transient excess voltage.

特性 Features

? High speed: tpd =5.0 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 74F240/244