Dual 4-bit bus buffer — supply rail and drive current
The SN74ABT2244ADBR: Output drive is 32mA source and 12mA sink per channel, which means it can fan out to multiple TTL loads or drive a 50-ohm backplane termination — the asymmetric drive is typical of ABT logic, optimised for the push-pull dynamics of a heavily loaded bus.
Package, temperature, and layout fit
Housed in a 20-SSOP (5.30mm body width, 0.209-inch pitch) with surface-mount termination — the 0.65mm lead pitch is a standard fine-pitch SOIC variant that routes cleanly on a two-layer board if the bus traces stay short, but a four-layer stack-up helps keep the 5V rail clean when all eight outputs switch simultaneously.