HT23C040

CMOS 512K´8-Bit Mask ROM Features · · HT23C040 · Operating voltage: 2.7V~5.5V Low power consumption – Operation: 25mA max. (V CC=5V) 10mA max. (VCC=3V) – Standby: 30mA max. (V CC=5V) 10mA max. (VCC=3V) Access time: 120ns max. (VCC=5V) 250ns max. (VCC=3V) · · · · · · 524288´8-bit of mask ROM Mask option: chip enable CE/CE/OE1/OE1, and output enable OE/OE/NC TTL compatible inputs and outputs Tristate outputs Fully static operation Package type: 32-pin DIP/SOP General Description The HT23C040 is a read-only memory with high performance CMOS storage device whose 4096K of memory is arranged into 524288 word 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 microprocessors, but also eliminates bus contention in multiple bus microprocessor systems. An additional feature of the HT23C040 is its ability to enter the standby mode whenever the chip enable (CE/CE) is inactive, thus reducing current consumption to below 30mA. The combination of these functions makes the chip suitable for high density low power memory applications. 1 January 20, 2000 HT23C040 Block Diagram P re -c h a rg e C K T A 0 X Y P re -d e c o d e r A d d re s s B u ffe rs A 1 8 A T D X -D e c Y -D e c P u ll- h ig h N M O S R O M C e ll A rra y ( 5 1 2 K ´ 8 - B its ) Z -D e c Z - s e le c to r S e n s e A m p lifie r s C E /C E /O E 1 /O E 1 O E /O E /N C M u x C...