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MB88305 - NMOS Input / Output Expander

Download the MB88305 datasheet PDF. This datasheet also covers the MB88304 variant, as both devices belong to the same nmos input / output expander family and are provided as variant models within a single manufacturer datasheet.

General Description

The MB 88304/88305 have two interfaces: One is the processor interface; C$, LDI, and DI3-DI0, which are used for the processor to communicate with the MB 88304/5 devices.

Another is the expansion I/O ports; Ports A, B, C, and D, which serve as an expansion of the processor's I/O.

Key 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).

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (MB88304-Fujitsu.pdf) that lists specifications for multiple related part numbers.

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Other Datasheets by Fujitsu Semiconductor Limited

Part Number Description
MB88301A NMOS 1 Channel / 13 Bit and 3 Channel / 6 Bit D/A Converter
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MB88304 NMOS Input / Output Expander
MB88306 (MB88306 - MB88309) CMOS Output Expander
MB88307 (MB88306 - MB88309) CMOS Output Expander

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
FUJITSU 11111111111111111111111111111111111111111111111111111111111111111 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 microcomputer (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.