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27C040 - 4 /194 /304-Bit 512K x 8 High Performance CMOS EPROM

General Description

The NM27C040 is a high performance, 4,194,304-bit Electrically Programmable UV Erasable Read Only Memory.

It is organized as 512K words of 8 bits each.

Its pin-compatibility with byte-wide JEDEC EPROMs enables upgrades through 8 Mbit EPROMs.

Key Features

  • s High performance CMOS.
  • 120, 150ns access time.
  • s Simplified upgrade path.
  • VPP is a “Don’t Care” during normal read operation s Manufacturer’s identification code s JEDEC standard pin configuration.
  • 32-pin PDIP.
  • 32-pin PLCC.
  • 32-pin CERDIP.
  • Note: New revision meets 70ns. Please check with factory for availability. Block Diagram VCC GND VPP OE CE/PGM Output Enable, Chip Enable, and Program Logic Data Outputs O0 - O7 Output Buffers Y Decoder.

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NM27C040 4,194,304-Bit (512K x 8) High Performance CMOS EPROM February 1999 NM27C040 4,194,304-Bit (512K x 8) High Performance CMOS EPROM General Description The NM27C040 is a high performance, 4,194,304-bit Electrically Programmable UV Erasable Read Only Memory. It is organized as 512K words of 8 bits each. Its pin-compatibility with byte-wide JEDEC EPROMs enables upgrades through 8 Mbit EPROMs. The “Don’t Care” feature on VPP during read operations allows memory expansions from 1M to 8 Mbits with no printed circuit board changes. The NM27C040 provides microprocessor-based systems extensive storage capacity for large portions of operating system and application software. Its 120ns access time provides high speed operation with high-performance CPUs.