Description
The Hitachi HM628128D Series is 1-Mbit static RAM organized 131,072-kword × 8-bit.  HM628128D Series has realized higher density, higher performance and low power consumption by employing HiCMOS process technology.  The HM628128D Series offers low power standby power dissipation; therefore, it is suitable for battery backup systems.  It has package variations of standard 32-pin plastic DIP, standard 32-pin plastic SOP and standard 32-pin plastic TSOPI.

FEATUREs
• Single 5 V supply: 5 V ± 10%
• Access time: 55 ns/70 ns (max)
• Power dissipation
    - Active: 30 mW/MHz (typ)
    - Standby: 10 µW (typ)
• 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
• Battery backup operation
    - 2 chip selection for battery backup