UPB8228 Datasheet (NEC) - 8080A SYSTEM CONTROLLER AND BUS DRIVER

UPB8228, 8080A SYSTEM CONTROLLER AND BUS DRIVER

BLOCK DIAGRAM PROCESSOR 03 DATA BUS SYSTEM DATA BUS vee@- GNO@-I STSTS(1) * 572 MEMR MEMW IIOR I/OW I3USEN ~PB8228/8238 ABSOLUTE MAXIMUM RATINGS * Operating Temperature .

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Storage Temperature .

All Output or Supply Voltages ..

All Input Voltages .

Output Currents O°C to +70

NEe Microcomputers, Inc.

fttIEC Jl,PB8228 J.I PB8238 8080A SYSTEM CONTROLLER AND BUS DRIVER OESCR IPTION The pPB8228/8238 is a single chip cOntroller and bus driver for 8080A based systems.

All the required interface signals rrecessary to connect RAM, ROM and I/O components to a pPD8080A are generated.

The pPB8228/8238 provides a bi directional three state bus driver for high TTL fan-out and isolation of the processor data bus from the system data bus for increased noise immunity.