HT23C020
CMOS 256K
×
8-Bit Mask ROM
Features
•
•
•
Operating voltage 2.7V~5.5V
Low power consumption
–
Operation: 25mA max. (V
CC
=5V)
10mA max. (V
CC
=3V)
–
Standby: 30
µ
A max. (V
CC
=5V)
10
µ
A max. (V
CC
=3V)
Access time:150ns max. (V
CC
=5V)
250ns max. (V
CC
=3V)
•
•
•
•
•
•
262144
×
8 bits of mask ROM
Mask options: chip enable CE/CE/OE1/OE1,
CE1/CE1/OE2/OE2/NC and output enable
OE/OE/NC
TTL compatible inputs and outputs
Tristate outputs
Fully static operation
Package type: 32-pin DIP/SOP/PLCC
General Description
The HT23C020 is a read-only memory with
high performance CMOS storage device whose
2048K of memory is arranged into 262144
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-
essors, but also eliminates bus contention in
multiple bus microprocessor systems. An addi-
tional feature of the HT23C020 is its ability to
enter the standby mode whenever the chip en-
able (CE/CE or CE1/CE1) is inactive, thus re-
ducing current consumption to below 30
µ
A. The
combination of these functions make the chip
suitable for high density low power memory
applications.
Block Diagram
1
21st Aug ’98