HN27C256HG Series
32768-word × 8-bit CMOS UV Erasable and Programmable ROM
Maintenance only
Description
The Hitachi HN27C256HG is a 256-kbit ultraviolet erasable and electrically programmable ROM, featuring
sub-100-ns access times. The HN27C256HG realizes access time of 70 ns and 85 ns, employing the
advanced fine process and high speed circuitry technique. The timing conditions such as access time or
output hold time are designed as same as our byte-wide SRAMs’, allowing to use with SRAMs on the same
memory board by the same read timings. So its board design in 16-bit microprocessor systems is easy. Also,
the HN27C256HG realizes faster programming time than our conventional 256-kbit EPROM by Hitachi’s
Fast High-Reliability Programming Algorithm. Pin arrangement, pin configuration and programming voltage
are compatible with our 256-kbit EPROM series, therefore existing programmers can be used with the
HN27C256HG.
Features
• High speed: Access time 70/85 ns (max)
• Low power dissipation
Active mode: 30 mW (typ) (f = 1 MHz)
• High reliability and fast programming
Programming voltage: +12.5 V DC
Fast High-Reliability Programming Algorithm available
• Device identifier mode
Manufacturer code and device code
Ordering Information
Type No.
Access Time
Package
HN27C256HG-70
HN27C256HG-85
70 ns
85 ns
600-mil 28-pin cerdip (DG-28)
Note: This device is not available for new application.
