27C513

The Intel 27C513 is a 5V-only, 524,288-bit ultraviolet erasable and electrically programmable read only memory.It is organized as 4 pages of 18K 8-bit words. The 27C513's paged organization brings 64 K byte storage capacity to existing 126K EPROM-based designs and to popular 8-bit microprocessor or microcontroller systems that have 64 Kbyte total addressing capability.The 27C513 provides an ideal means of quadrupling current 16 Kbyte code space.

The 27C513 has the following features including:(1)170 ns access time; (2)two line control; (3)TTL and CMOS compatible; (4)software carrier capacity.The 27C513's large storage capability of 64 K bytes and 170 ns access time enables it to function as a high density software carrier.Entire operating systems, diagnostics,high-level language programs and specialized application software can reside in a 27C513 EPROM directly on a system's memory bus.This permits immediate microprocessor access and execution of software and eliminates the need for time-consuming disk accesses and downloads.The 27C513 has an automatic page clear circuit for ease of use of the page-addressed organization. The page-select latch is automatically cleared to the lowest order page upon system power up.Two-line control and industry standard 28-pin packaging are features common to all Intel high-density EPROMs.This assures easy microprocessor interfacing and minimum design efforts when upgrading,adding or choosing between nonvolatile memory alternatives.

The absolute maximum ratings of the 27C513 are:(1)voltage on any pin with respect to ground:-2 to 7V; (2)voltage on Ag with respect to ground:-2 to 13.5V; (3)operating temperature during read:0 to 70; (4)storage temperature:-65 to 125.Care should be taken in organizing software programs such that the number of page changes is minimized.This allows maximum system performance.Also, the processor's program counter status must be considered when page changes occur in the middle of an opcode sequence. After a page-select write, the program counter will be incremented to the next location (or further in pipelined systems) in the new page relative to that of the page-select write opcode in the previous page.