CDP1874C

The CDP1872C, CDP1874C and CDP1875C devices are high-speed 8-bit parallel input and output ports designed for use in the CDP1800 microprocessor system and for general use in other microprocessor systems. The CDP1872C and CDP1874C are 8-bit input ports; the CDP1875C is an 8-bit output port.

CDP1874C have flexible capabilities as buffers and data latches and are reset by CLR input when the data strobe is not active.

The CDP1872C and CDP1874C are functionally identical except for device selects.The CDP1872C has one active low and one active high select; the CDP1874C has two active high device selects. These devices also feature Three-state outputs when deselected. Data is strobed into the register on the leading edge of the CLOCK and latched on the trailing edge of the CLOCK.

The CDP1875C is an output port with data latched into the registers when the device selects are active. There are two active high and one active low selects. The output buffers are enabled at all times.