描述 Description

The Hitachi HN58C256A and HN58C257A are electrically erasable and programmable ROMs organized as 32768-word × 8-bit. They have realized high speed low power consumption and high reliability by employing advanced MNOS memory technology and CMOS process and circuitry technology. They also have a 64-byte page programming function to make their write operations faster.

特性 Features

? Single 5 V supply: 5 V ±10

? Access time: 85 ns/100 ns (max)

? Power dissipation

? - Active: 20 mW/MHz, (typ)

? - Standby: 110 μW (max)

? On-chip latches: address, data, CE, OE, WE

? Automatic byte write: 10 ms max

? Automatic page write (64 bytes): 10 ms max

? Ready/Busy (only the HN58C257A series)

? Data polling and Toggle bit

? Data protection circuit on power on/off

? Conforms to JEDEC byte-wide standard

? Reliable CMOS with MNOS cell technology

? 105 erase/write cycles (in page mode)

? 10 years data retention

? Software data protection

? Write protection by RES pin (only the HN58C257A series)

? Industrial versions (Temperatur range: – 20 to 85?C and – 40 to 85?C) are also available.