 Single 4.5V~5.5V power supply
 Small stand-by current: 0.6μA (5.0V, typical)
 No clocks, No refresh
 All inputs and outputs are TTL compatible.
 Easy memory expansion by CS1# and CS2
 Common Data I/O
 Three-state outputs: OR-tie Capability
 OE# prevents data contention on the I/O bus