The IDT 71256 is a 262,144-bit high-speed static RAM organized as 32K x 8. It is fabricated using IDT's high-performance, high-reliability CMOS technology. Address access times as fast as 20ns are available with power consumption of only 350mW (typ.). The circuit also offers a reduced power standby mode. When CS goes HIGH, the circuit will automatically go to and remain in, a low-power standby mode as long as CS remains HIGH. In the full standby mode, the low-power device consumes less than 15µW, typically. This capability provides significant system level power and cooling savings. The low-power (L) version also offers a battery backup data retention capability where the circuit typically consumes only 5µW when operating off a 2V battery. The IDT71256 is packaged in a 28-pin (300 or 600 mil) ceramic DIP, a 28-pin 300 mil SOJ, a 28-pin 600 mil DIP, and a 32-pin LCC.
The IDT71256S/L is a 256‑Kbit (32K × 8) CMOS static RAM offered in several temperature grades—military, industrial and commercial. It is fabricated with IDT's high‑performance CMOS process and provides TTL‑compatible I/O. The device supports low‑power standby mode and a battery‑backup version that retains data at 2 V.
The datasheet details electrical characteristics, timing diagrams, pin configurations, package options (28‑pin ceramic or plastic DIP, SOU, 32‑pin LCC) and ordering information for each temperature and speed grade. It also includes absolute maximum ratings and a document history.
| Memory capacity | 256 Kbit (32K × 8) |
|---|---|
| Military temperature range | -65 °C to +125 °C |
| Industrial temperature range | -40 °C to +85 °C |
| Commercial temperature range | 0 °C to +70 °C |
| Standby power consumption (full standby) | < 15 mW |
| Package options | 28‑pin ceramic DIP, 28‑pin plastic DIP, 28‑pin SOU, 32‑pin LCC |
In full standby the low‑power version consumes less than 15 mW.
The RAM is available in 28‑pin ceramic DIP, 28‑pin plastic DIP, 28‑pin SOU and 32‑pin LCC packages.