This is transceiver.
Part Number : 74HC245, MM74HC245
Function : Octal 3-STATE Transceiver
Package : DIP 20 Pin Type
Manufacturers : Fairchild Semiconductor
The 74HC245, 3-STATE bidirectional buffer utilizes advanced silicon-gate CMOS technology, and is intended for two-way asynchronous communication between data buses. It has high drive current outputs which enable high speed operation even when driving large bus capacitances. This circuit possesses the low power consumption and high noise immunity usually associated with CMOS circuitry, yet has speeds comparable to low power Schottky TTL circuits.
Pinout and Truth Table
5. High output drive: 6 mA (minimum)
Other data sheets within the file : MM74HC245ACW, MM74HC245AMTC, MM74HC245AMTCX, MM74HC245AN
74HC245 Datasheet PDF Download