DM74LS240CW

Octal 3-STATE Buffer/Line Driver/Line Receiver

General Description

These buffers/line drivers are designed to improve both the performance and PC board density of 3-STATE buffers/ drivers employed as memory-address drivers, clock driv ers, and bus-oriented transmitters/receivers. Featuring 400 mV of hysteresis at each low current PNP data line input, they provide improved noise rejection and high fanout outputs and can be used to drive terminated lines down to 133Ω.

Features

■3-STATE outputs drive bus lines directly

■PNP inputs reduce DC loading on bus lines

■Hysteresis at data inputs improves noise margins

■Typical IOLsink current  24 mA

■Typical IOHsource current  −15 mA

■Typical propagation delay times

   Inverting 10.5 ns

   Noninverting 12 ns

■Typical enable/disable time 18 ns

■Typical power dissipation enabled

   Inverting 130 mW

   Noninverting 135 mW