HT23C128

HT23C128 CMOS 16K×8-Bit Mask ROM Features Operating voltage: 2.7V~5.5V Low power consumption – Operation: 25mA Max. (V CC=5V) 10mA Max. (VCC=3V) – Standby: 30µA Max. (VCC=5V) 10µA Max. (VCC=3V) Access time:150ns Max. (VCC=5V) 250ns Max. (VCC=3V) 16384×8 bits of mask ROM Mask options: chip enable CE/CE/OE2/OE2 and output enable OE/OE/NC & OE1/ OE1/NC TTL compatible inputs and outputs Tristate outputs Fully static operation Package type: 28-pin DIP/SOP General Description The HT23C128 is a read-only memory with high performance CMOS storage device whose 128K of memory is arranged into 16384 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 microprocessors, but also eliminates bus contention in multiple bus microprocessor systems. An additional feature of the HT23C128 is its ability to enter the standby mode whenever the chip enable (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 HT23C128 Pin Assignment Pin Description Pin Name NC A0~A13 D0~D7 VSS CE/CE/OE2/OE2 OE/OE/NC OE1/OE1/NC VCC I/O — I O I I I I I No connection Address inputs Data outputs Negative power supply Description Chip enable/Output enable input Output enable input Output enable input...