The X28C513EMB-15 is a 512Kbit parallel EEPROM organized as 64K x 8 bits, with a 150 ns access time and a 4.5 V supply.
The 150 ns access time means the EEPROM can be read by a processor running at up to roughly 6.7 MHz without wait states, assuming typical memory-controller setup and hold margins. For faster CPUs, the bus controller adds wait cycles or a ready/busy handshake.
Package and temperature grade — design-in realities
The 32CLCC is a ceramic leaded chip carrier with a hermetic seal, suited for high-reliability and space-grade assemblies. The 4.5 V supply is a nominal minimum — the part is not a 3.3 V or 5.0 V ±10% device, so the power rail must be regulated to at least 4.5 V across all load and temperature conditions. Surface-mount soldering to a PCB follows standard CLCC footprint guidelines; the ceramic body is MSL 1 but still requires a bake if the moisture barrier bag is compromised.