HT23C256 Datasheet, PDF (1/8 Pages) Holtek Semiconductor Inc – CMOS 32Kx 8-Bit Mask ROM

HT23C256
CMOS 32K×8-Bit Mask ROM
Features
• _{Operating voltage 2.7V~5.5V}
• _{Low power consumption}
– _{Operation: 25mA max. (VCC=5V)}
10mA max. (VCC=3V)
– _{Standby: 30µA max. (VCC=5V)}
10µA max. (VCC=3V)
• _{Access time:150ns max. (VCC=5V)}
250ns max. (VCC=3V)
General Description
The HT23C256 is a read-only memory with
high performance CMOS storage device whose
256K of memory is arranged into 32768 words
by 8 bits.
For application flexibility, the chip enable and
output enable control pins can be selected as
active high or active low. This flexibility not
only allows easy interface with most microproc-
• _{32768×8 bits of mask ROM}
• _{Mask options: chip enable CE/CE/OE1/OE1 and}
output enable OE/OE/NC
• _{TTL compatible inputs and outputs}
• _{Tristate outputs}
• _{Fully static operation}
• _{Package type: 28-pin DIP/SOP}
essors, but also eliminates bus contention in
multiple bus microprocessor systems. An addi-
tional feature of the HT23C256 is its ability to
enter the standby mode whenever the chip en-
able (CE/CE) is inactive, thus reducing current
consumption to below 30µA. The combination of
these functions makes the chip suitable for high
density low power memory applications.
Block Diagram
1
24th Aug ’98