INS8154 Datasheet | National Semiconductor

e~.National ~ Semiconcluctor INS&154 N.ChanRel 12&.by.& Bit RAM Input/Outriit (RAM 1/0) General Description The RAM Input/Output Chip if'.' LSI device wh/ch provides random access memor' Peripheral interfacing for microputer syste he RAM portion contains 1024 bits of static R anized as 128x8, The 1/0 portion consists of t ripheral ports of eight bits each. Each of the 1/0 im ln the two ports may be defined as an input or': -output to provide maximum flexibility. Each port iv be read from or written to in a parallel (8-bit b ' (mode. To improve efficiency and simplify programrijing in control-based applications, a single bit of 1/0 II' either port may be Set, cleared or read with a...