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CDP1851CD Datasheet(PDF) 1 Page - Intersil Corporation |
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CDP1851CD Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 14 page 4-5 CDP1851, CDP1851C CMOS Programmable I/O Interface Description 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 configuration 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 suffix) or hermetic ceramic (D suffix) packages. The CDP1851C is also available in chip form (H suffix). Features • 20 Programmable I/O Lines • Programmable for Operation in Four Modes: - Input - Output - Bidirectional - Bit-programmable • Operates in Either I/O or Memory Space Ordering Information PACKAGE TEMP. RANGE 5V 10V PKG. NO. PDIP -40oC to +85oC CDP1851CE CDP1851E E40.6 Burn-In CDP1851CEX - E40.6 SBDIP -40oC to +85oC CDP1851CD - D40.6 Burn-In CDP1851CDX CDP1851DX D40.6 March 1997 File Number 1056.2 Pinout CDP1851, CDP1851C (PDIP, SBDIP) TOP VIEW 13 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 17 18 19 20 CLOCK CS RA0 RA1 BUS0 BUS1 BUS2 BUS3 BUS4 BUS5 BUS6 BUS7 CLEAR A INT B INT B RDY B B0 B1 VSS 28 40 39 38 37 36 35 34 33 32 31 30 29 27 26 25 24 23 22 21 VDD RD/WE WR/RE TPB A RDY A A0 A1 A2 A3 A4 A5 A6 A7 B7 B6 B5 B4 B3 B2 STROBE STROBE CDP1851 Programming Modes MODE (8) PORT A DATA PINS (2) PORT A HANDSHAKING PINS (8) PORT B DATA PINS (2) PORT B HANDSHAKING PINS Input Accept Input Data READY, STROBE Accept Input Data READY, STROBE Output Output Data READY, STROBE Output Data READY, STROBE Bidirectional (Port A Only) Transfer In- put/Output Data Input Handshaking for Port A Must be Previous- ly Set to Bit-Pro- grammable Mode Output Handshaking for Port A Bit-Program- mable Programmed In- dividually as In- puts or Outputs Programmed Individ- ually as Inputs or Outputs Programmed Indi- vidually as Inputs or Outputs Programmed Individ- ually as Inputs or Outputs CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999 |
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