High Speed NMOS SRAM
• 45 ns maximum access time
• No clocks or strobes required
• Automatic CE power down
• Identical cycle and access times
• Single +5V supply (± 10%)
• Pinout and function compatible to SY2147
• Total TTL compatible:
All inputs and outputs
• Separate data input and output
• High density 18-pin package
• Three-state output
The UMC UM2147 is a 4096-Bit Static Random Access
Memory organized 4096 words by 1-bit and is fabricated
using UMC's new scaled N-channel silicon gate technology.
It is designed using fully static circuitry, therefore requiring
no clock or refreshing to operate. Address set-up times
are not required and the data is read out non-destructively
with the same polarity as the input data. Separate data
input and output pins provide maximum design flexibility.
The three-state output facilitates memory expansion by
allowing the outputs to be OR-tied to other devices.
The UM2147 offers an automatic power down feature.
Power down is controlled by the Chip Enable input. When
Chip Enable (CE) goes high, thus deselecting the UM2147
the device will automatically power down and r€main
in a standby power mode as long as CE remain high. This
unique feature provides system level power savings as
much as 80%.
The UM2147 is packaged in an 18-pin DIP for the highest
possible density. The device is fully TTL compatible and
has a si ngle +5V. power supply.
A1 - V C C
CE - -.....-11-,