XM28C040 is a high density 4 Megabit (512K x 8) module from Xicor company with 200ns access time, working temperature range of –55°C to +125°C. The module consists of four X28C010s mounted on a co-fired multilayered ceramic substrate. XM28C040 is configured as 512K x 8 bit and supports a 256-byte page write operation. The module also supports DATA Polling or Toggle Bit Polling, effectively providing a 39µs/byte write cycle, enabling the entire array to be rewritten in 10 seconds. XM28C040 provides the same high endurance and data retention as the X28C010.
The XM28C040 is a high‑density 4 Megabit (512 K × 8) E2PROM module operating at 5 V. It offers an access time of 200 ns, supports three temperature ranges (Commercial 0 °C‑+75 °C, Industrial ‑40 °C‑+85 °C, Military ‑55 °C‑+125 °C), and provides 100 000 write‑cycle endurance. The module uses a 256‑byte page‑write architecture that can rewrite the entire array in about 10 seconds.
Key features include fast write cycles (≈5 ms per byte), DATA Polling and Toggle‑Bit status bits for write‑completion detection, and both hardware (noise protection, VCC sense, write‑inhibit) and software data‑protection mechanisms that can be enabled via a defined command sequence.
| Memory Capacity | 512K × 8 bits |
|---|---|
| Access Time | 200 ns |
| Supply Voltage | 5 V |
| Temperature Range – Commercial | 0 °C to +75 °C |
| Temperature Range – Industrial | -40 °C to +85 °C |
| Temperature Range – Military | -55 °C to +125 °C |
| Endurance | 100 000 write cycles |
| Page Write Size | 256 bytes |
| Typical Byte Write Time | ≈5 ms |
| Package Type | 32‑pin dual‑in‑line module |
The XM28C040 has an access time of 200 ns.
It supports Commercial (0 °C‑+75 °C), Industrial (‑40 °C‑+85 °C) and Military (‑55 °C‑+125 °C) ranges.
During a write, DATA Polling lets the host read a status bit; when the bit reflects true data the internal programming cycle is finished.
Noise protection (WE pulse <10 ns ignored), default VCC sense (functions inhibited below 3 V), and write‑inhibit (OE held low prevents writes during power‑up/down).