Cmos Programmable I/o Interface

THE CDP1851 and CDP1851C are CMOS programmable two- port I/Os designed for use as general-purpose I/O devices. They are directly compatible with CDP1800-series micropro- cessors functioning at maximum Clock frequency. Each port CAN be programmed in either byte-I/O or bit-programmable modes for interfacing with peripheral devices such as printers and keyboards. Both ports A and B CAN be separately programmed to be 8-bit input or output ports with handshaking control lines, RDY and STROBE. Only port A CAN be programmed to be a bidirectional port. This conguration provides a means for communicating with a peripheral device or Microprocessor system on a single 8-bit bus for both transmitting and receiving data. Handshaking signals are provided to maintain proper bus access control. Port A handshaking lines are used for input control and port B handshaking lines are used for output; therefore port B must be in the bit-programmable mode where handshaking is not used. Ports A and B CAN be separately bit programmed so that each individual line CAN be designated as an input or output line. The handshaking lines may also be individually programmed as input or output when port A is not in bidirectional mode. The CDP1851 has a supply-voltage range of 4V to 10.5V, and the CDP1851C has a range of 4V to 6.5V. Both types are sup- plied in 40-lead dual-in-line plastic (E sufx) or hermetic ceramic (D sufx) packages. The CDP1851C is also available in chip form (H sufx). By Intersil Corporation
Part Manufacturer Description Datasheet Samples
CDP1851CDX Rochester Electronics LLC Parallel I/O Port, 20 I/O, CMOS, CDIP40, DIP-40
CDP1851CEX Rochester Electronics LLC Parallel I/O Port, 20 I/O, CMOS, PDIP40, DIP-40
CDP1851CD Rochester Electronics LLC Parallel I/O Port, 20 I/O, CMOS, CDIP40, DIP-40
CDP1851E Rochester Electronics LLC Parallel I/O Port, 20 I/O, CMOS, PDIP40
CDP1851CE Rochester Electronics LLC Parallel I/O Port, 20 I/O, CMOS, PDIP40
CDP1851CH Rochester Electronics LLC Replacement for Intersil part number CDP1851CH. Buy from authorized manufacturer Rochester Electronics.
CDP1851DX Rochester Electronics LLC Parallel I/O Port, 20 I/O, CMOS, CDIP40
CDP1851 's PackagesCDP1851 's pdf datasheet
CDP1851CE
CDP1851E
CDP1851CEX
CDP1851CD
CDP1851CDX
CDP1851DX
CDP1851C




CDP1851 Pinout, Pinouts
CDP1851 pinout,Pin out
This is one package pinout of CDP1851,If you need more pinouts please download CDP1851's pdf datasheet.

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