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CDP1871AC

Part Number	CDP1871AC
Manufacturer	Intersil Corporation
Description	CMOS Keyboard Encoder
Published	Mar 23, 2005
Detailed Description	CDP1871A, CDP1871AC REFERENCE APP NOTE 7374 August 1996 CMOS Keyboard Encoder Description The CDP1871A is a keyboard en...
Datasheet	CDP1871AC PDF File

Overview

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.
They differ in that the CDP1871A has a recommended operating voltage range of 4V to 10.
5V, and the CDP1871AC has a recommended operating voltage range 4V to 6.
5V.
These types are supplied in 40 lead dual-in-line ceramic packages (D sufﬁx), and 40 lead dual-in...

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