These bus buffers feature three-state outputs that, when enabled, have the low impedance characteristics of a TTL output with additional drive capability at high logic levels to permit driving heavily loaded bus lines without external pullup resistors. When disabled, both output transistors are turned off, presenting a high-impedance state to the bus so the output will act neither as a significant load nor as a driver. The SN74LS125AN devices outputs are disabled when G is high.
Quad Bus Buffers
Separate Control for Each Channel
14 pin DIP. Manufactured by Motorola.