DM74LS245N

三态八路总线收发器 3-STATE Octal Bus Transceiver

General Description

These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control function implementation minimizes external timing requirements. The device allows data transmission from the A Bus to the B Bus or from the B Bus to the A Bus depending upon the logic level at the direction control DIR input. The enable input G can be used to disable the device so that the buses are effectively isolated.

Features

■Bi-Directional bus transceiver in a high-density 20-pin package

■3-STATE outputs drive bus lines directly

■PNP inputs reduce DC loading on bus lines

■Hysteresis at bus inputs improve noise margins

■Typical propagation delay times, port-to-port 8 ns

■Typical enable/disable times 17 ns

■IOLsink current 24 mA

■IOHsource current −15 mA