The Hitachi HM628128A is a CMOS static RAM organized 128 kword × 8 bit. It realizes higher density, higher performance and low power consumption by employing 0.8 µm Hi-CMOS process technology.
It offers low power standby power dissipation; therefore, it is suitable for battery back-up systems. The device, packaged in a 525-mil SOP (460-mil body SOP) or a 600-mil plastic DIP, or a 8 × 20 mm TSOP with thickness of 1.2 mm, is available for high density mounting. TSOP package is suitable for cards, and reverse type TSOP is also provided.

FEATUREs
• High speed
   — Fast access time: 55/70/85/100 ns (max)
• Low power
   — Active: 75 mW (typ)
   — Standby: 10 µW (typ)
• Single 5 V supply
• Completely static memory
   No clock or timing strobe required
• Equal access and cycle times
• Common data input and output
   Three state output
• Directly TTL compatible
   All inputs and outputs
• Capability of battery back up operation
   2 chip selection for battery back up