EEPROM Memory | CAT28C257

256 kb Parallel EEPROM Memory

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The CAT28C257 is a fast, low power, 5.0 V-only CMOS parallel EEPROM organized as 32k x 8-bits. It requires a simple interface for in-system programming. On-chip address and data latches, self-timed write cycle with autoclear and VCC power up/down write protection eliminate additional timing and protection hardware. DATA Polling and Toggle status bits signal the start and end of the selftimed write cycle. Additionally, the CAT28C257 features hardware and software write protection.
The CAT28C257 is manufactured using onsemi's advanced CMOS floating gate technology. It is designed to endure 100,000 program/erase cycles and has a data retention of 100 years. The device is available in JEDEC approved 28-pin DIP or 32-pin PLCC packages.

  • Automotive Systems
  • Communications Systems
  • Computer Systems
  • Consumer Systems
  • Industrial Systems

  • Fast read access times: 120/150ns
  • Low power CMOS dissipation:
    – Active: 25 mA max.
    – Standby: 150 μA max.
  • Simple write operation:
    – On-chip address and data latches
    – Self-timed write cycle with auto-clear
  • Fast write cycle time:
    – 5ms max.
  • CMOS and TTL compatible I/O
  • Hardware and software write protection
  • Commercial, industrial and automotive temperature ranges
  • Automatic page write operation:
    – 1 to 128 bytes in 5ms
    – Page load timer
  • End of write detection:
    – Toggle bit
    – DATA polling
  • 100,000 program/erase cycles
  • 100 year data retention

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