CDP1871A 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...
CDP1871A Key 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