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