XM28C020 is a 2Mbit E2PROM with 5V power supply, byte alterable, and fast write cycle.
The XM28C020 is a high‑density 2 Megabit (256K × 8) E2PROM module composed of four X28C513 LCCs on a ceramic substrate. It supports 5 V operation, 128‑byte page writes, and offers both data‑polling and toggle‑bit methods for write‑completion detection.
Key features include a 150 ns access time over a –55 °C to +125 °C range, three temperature specifications (commercial, industrial, military), 100 000 write‑cycle endurance, and hardware protections such as noise protection and write‑inhibit. The manual details pin functions, command sequences for software data protection, system‑level considerations, and absolute maximum ratings.
| Memory density | 2 Megabit (256K × 8) |
|---|---|
| Access time | 150 ns (–55 °C to +125 °C) |
| Supply voltage | 5 V |
| Endurance | 100,000 write cycles |
| Temperature ranges | Commercial 0 °C‑+75 °C, Industrial –40 °C‑+85 °C, Military –55 °C‑+125 °C |
| Active current | 100 mA |
| Standby current | 5 mA |
| Absolute maximum temperature | –65 °C to +135 °C |
The page write feature allows up to 128 bytes of data to be written consecutively before the internal programming cycle starts.
The XM28C020 provides DATA Polling on I/O7 and a Toggle Bit on I/O6 to indicate write‑cycle completion.
The device operates from a 5 V supply.
It is rated for commercial (0 °C‑+75 °C), industrial (–40 °C‑+85 °C), and military (–55 °C‑+125 °C) temperature ranges.