MB88304 Datasheet | Fujitsu Semiconductor Limited

FUJITSU MB 88304 MB 88305 April 1986 Edition 1.1 NMOS INPUT/OUTPUT EXPANDER The Fujitsu MB 88304/MB 88305 are peripheral integrated circuits that can be connected to a 4-bit or 8-bit single-chip microputer (MCU) to provide additional I/O ports. Besides furnishing simple I/O port expansion, the MB 88304 and MB 88305 can AND or OR port data with data from the MCU, on instruction from the MCU. The MB 88304/MB 88305 are pseudo-bidirectional ports. They are accessed in 4-bit units, but each individual bit can be used for either input or output, and input and output can be intermixed. The interface to the MCU requires only the connection of a 4-bit interface port and a strobe signal. All output ports of the MB 88304 are open-drain; MB 88305 output ports all have pull-up resistors. The output ports on both chips are reset to the high-impedance state at power-up. The MB 88304/MB 88305 are fabricated with N-channel silicon-gate E/D MOS process, and packaged in 24-pin plastic DIP. Also, they are powered with a single +5V power supply, and operate over the ambient temperature range of _30°C to +70°C. Features - Four 4-bit I/O ports (16 lines) - Four Functions: parallel input, parallel output, AND output, and OR output - AND and OR functions provide individual output capability - Single-bit input/output: Input and output can be intermixed on each port - High output drive - Built-in power-on reset circuit - CS pin for simplified input/output expansion - Two output circuit types: Open-drain output (MB 88304) 3-state output (MB 88305) - Easily connectable to MCUs with 8243 interface - Single +5V power supply - _30°C to +70°C operating temperature range - N-channel silicon-gate E/D MOS process - 24-pin plastic DIP (Suffix: -PI 2-171 PLASTIC DIP DIP-24P-MOl PIN ASSIGNMENT PBO" PAO" PAl' 3 PA2' PA3- 5 TOP VIEW 7 013 012 011 Vee PB1" PB2' PB3- PCO' PC1" PC2" PC3' P03' P02' POI' POO' - {MB 88304:...