HN58C257A Overview
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.
HN58C257A Key Features
- Single 5 V supply: 5 V ±10%
- Access time: 85 ns/100 ns (max)
- Power dissipation
- 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