This datasheet provides the features and characteristics of IDT71256, including high performance, low power consumption and battery backup
The IDT71256 is a 256‑Kbit (32K × 8‑bit) high‑speed CMOS static RAM offered in standard and low‑power versions. It is available in several 28‑pin and 32‑pin packages and meets MIL‑STD‑883 Class B for military applications.
Key features include fast address access times (as low as 20 ns for commercial parts), low standby power (<15 µW), and optional battery‑backed data retention at 2 V. The device operates from a 5.0 V supply with a ±10 % tolerance and supports a wide temperature range, from –55 °C to +125 °C for military grades and 0 °C to +70 °C for commercial grades.
| Memory size | 256 K (32 K × 8‑bit) |
|---|---|
| Address access time (commercial) | 20 ns (max) |
| Address access time (military) | 25 ns (max) |
| Typical power consumption | 350 mW |
| Standby power (low‑power mode) | <15 µW |
| Battery backup retention power | 5 µW at 2 V |
| Military temperature range | -55 °C to +125 °C |
| Commercial temperature range | 0 °C to +70 °C |
It is a 262,144‑bit static RAM organized as 32 K × 8‑bit, giving a total of 256 K bits.
The military version works from –55 °C to +125 °C, while the commercial version is rated from 0 °C to +70 °C.
Yes, in low‑power mode standby current is under 15 µW, and a 2 V battery can retain data with a consumption of about 5 µW.