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CDP1871A - CMOS Keyboard Encoder

Description

The CDP1871A is a keyboard encoder designed to directly interface between a CDP1800-series microprocessor and a mechanical keyboard array, providing up to 53 ASCII coded keys and 32 HEX coded keys, as shown in the system diagram (Figure 1).

Features

  • Directly Interfaces with CDP1800-Series Microprocessor.
  • Low Power Dissipation.
  • Three-State Outputs.
  • Scans and Generates Code for 53 Key ASCII Keyboard Plus 32 HEX Keys (SPST Mechanical Contact Switches).
  • Shift, Control, and Alpha Lock Input.
  • RC-Controlled Debounce Circuitry.
  • Single Supply 4V to 10.5V.
  • . . . (CDP1871A) 4V to 6.5V.
  • . . . (CDP1871AC).
  • N-Key Lockout Ordering Information PACKAG.

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Full PDF Text Transcription

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CDP1871A, CDP1871AC REFERENCE APP NOTE 7374 August 1996 CMOS Keyboard Encoder Description The CDP1871A is a keyboard encoder designed to directly interface between a CDP1800-series microprocessor and a mechanical keyboard array, providing up to 53 ASCII coded keys and 32 HEX coded keys, as shown in the system diagram (Figure 1). The keyboard may consist of simple single-pole single-throw (SPST) mechanical switches. Inputs are provided for alpha-lock, control, and shift functions, allowing 160 unique codes. An external R-C input is available for user-selectable debounce times. The Nkey lock-out feature prevents unwanted key codes if two or more keys are pressed simultaneously. The CDP1871A and CDP1871AC are functionally identical.
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