The AMD AM27S281A/BLA is an 8Kbit (1K x 8) parallel PROM in a 24-pin ceramic DIP, rated across the full military temperature range of -55°C to 125°C. It is a one-time-programmable non-volatile memory intended for code or lookup-table storage in applications where field updates are not required. The 50 ns access time is the critical timing parameter — it sets the bus margin for the address-to-data path in the target system; a slower part will cause read failures, a faster one is fine as long as the output hold times still meet the controller's setup window.
Package and mounting
The 24-pin ceramic DIP (24CDIP) is a through-hole package. It is designed for socketed or soldered installation on a PCB or wire-wrap board. The -55°C to 125°C operating temperature range (case temperature) confirms it is rated for high-reliability deployments.