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CDP1871

Part Number	CDP1871
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	CDP1871 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-line plastic packages (E sufﬁx), and 44 lead plastic chip-carrier packages (Q sufﬁx).
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.
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(CDP1871A) 4V to 6.
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(CDP1871AC) • N-Key Lockout Ordering Information PACKAGE PDIP PLCC SBDIP Burn-In TEMP.
RANGE 5V 10V PKG.
NO.
-40oC to +85oC CDP1871ACE -40oC to +85oC CDP1871ACQ -40oC to +85oC CDP1871ACD CDP1871ACDX CDP1871AE E40.
6 N44.
65 CDP1871AD D40.
6 D40.
6 Pinouts CONTROL DEBOUNCE 40 LEAD PDIP, CERDIP TOP VIEW D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 S1 S2 S3 S4 S5 S6 S7 S8 VSS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 VDD SHIFT CONTROL ALPHA DEBOUNCE RTP TPB...

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