The Hitachi HM628128A is a 131,072-word×8-bit high performance static RAM. It is manufactured with 0.8µm Hi-CMOS process technology and features high speed and low power consumption. The HM628128A is packaged in a 525-mil SOP, 600-mil plastic DIP, or 8×20mm TSOP, suitable for high density mounting.
The HM628128A series is a high‑speed CMOS static RAM organized as 128 kword × 8 bit. It offers fast access times, low active and standby power, and can operate from a single 5 V supply. The device is available in several packages, including 600‑mil plastic DIP, 525‑mil SOP, and 8 mm × 20 mm TSOP, making it suitable for high‑density mounting and battery‑back‑up applications.
The datasheet provides detailed electrical characteristics such as access times ranging from 55 ns to 100 ns, active power of 75 mW (typ), standby power of 10 pW (typ), and supply voltage specifications of 4.5 V to 5.5 V. It also includes absolute maximum ratings, recommended operating conditions, and timing diagrams for read cycles and low‑voltage data retention.
| Access time | 55/70/85/100 ns (max) |
|---|---|
| Active power consumption | 75 mW typ |
| Standby power consumption | 10 pW typ |
| Supply voltage (typical) | 4.5‑5.5 V |
| Operating temperature range | 0 °C to +70 °C |
| Package options | 600‑mil DIP, 525‑mil SOP, 8 mm × 20 mm TSOP |
The access time ranges from 55 ns to 100 ns depending on the device version.
The standby power consumption is typically 10 pW.
The device operates with a supply voltage between 4.5 V and 5.5 V.