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CDP1871A Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer CDP1871A
Beschreibung CMOS Keyboard Encoder
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 10 Seiten
CDP1871A Datasheet, Funktion
REFERENCE APP NOTE 7374
August 1996
CDP1871A,
CDP1871AC
CMOS Keyboard Encoder
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
PACKAGE
PDIP
PLCC
SBDIP
TEMP. RANGE
5V
-40oC to +85oC CDP1871ACE
-40oC to +85oC CDP1871ACQ
-40oC to +85oC CDP1871ACD
PKG.
10V NO.
CDP1871AE E40.6
- N44.65
CDP1871AD D40.6
Burn-In
CDP1871ACDX
- D40.6
Description
The CDP1871A is a keyboard encoder designed to
directly interface between a CDP1800-series micro-
processor 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 N-
key 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).
Pinouts
40 LEAD PDIP, CERDIP
TOP VIEW
D1 1
D2 2
D3 3
D4 4
D5 5
D6 6
D7 7
D8 8
D9 9
D10 10
D11 11
S1 12
S2 13
S3 14
S4 15
S5 16
S6 17
S7 18
S8 19
VSS 20
40 VDD
39 SHIFT
38 CONTROL
37 ALPHA
36 DEBOUNCE
35 RTP
34 TPB
33 DA
32 BUS 7
31 BUS 6
30 BUS 5
29 BUS 4
28 BUS 3
27 BUS 2
26 BUS 1
25 BUS 0
24 CS4
23 CS3
22 CS2
21 CS1
44 LEAD PLCC
(Q Suffix) TOP VIEW
6 5 4 3 2 1 44 43 42 41 40
D5 7
D6 8
D7 9
D8 10
D9 11
D10 12
D11 13
S1 14
S2 15
S3 16
S4 17
39
38
37
36
35
34
33
32
31
30
29
18 19 20 21 22 23 24 25 26 27 28
RPT
TPB
DA
BUS 7
BUS 6
BUS 5
BUS 4
BUS 3
BUS 2
BUS 1
NC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
4-66
File Number 1374.2






CDP1871A Datasheet, Funktion
CPU
CDP1800- Series Signal
CDP1871A, CDP1871AC
CS4
MRD
MRD
MRD
TABLE 2. VALID N-LINE CONNECTIONS
CDP1871A SIGNAL
CS3 CS2 CS1
N2 N0 N1
N0 N1 N2
N2 N1 N0
CPU INPUT
INSTRUCTION
INP5
INP3
INP6
SENSE
LINES
S1
D1
SP 0
0
S2 ! 1
1
S3 “ 2
2
S4 # 3
3
S5 $ 4
4
S6 % 5
5
S7 & 6
6
S8 ‘ 7
7
TABLE 3. DRIVE AND SENSE LINE KEYBOARD CONNECTIONS (NOTE 2)
DRIVE LINES
D2
(8
8
D3
‘@
@ NUL
D4
HH
h BS
D5
PP
p DLE
D6
XX
x CA
N
D7
Space
D8 D9
801 8816
6
D10
9016
D11
9816
) 9 A A I I QQY Y
9 a SOH i HT q DC1 y EM
811 8916
6
9116
9916
*
: B B J J RRZ Z
Line
821 8A16 9216 9A16
Feed
6
: b STX j LF r DC2 z SU
B
+ ; C C K K S S { [ Escape 831 8B16 9316 9B16
; c ETX k VT s DC3 [ ES
6
C
< , DD LLTT | \
|
, d EOT I FF t DC4 \ FS
841 8C16
6
9416
9C16
= - E E M M U U } ] Carriage 851 8D16 9516 9D16
Return
6
- e ENQ m CR u NA ] GS
K
> . F F NNVV~
. f ACK n SO v SY RS
N
861 8E16
6
9616
9E16
? / G G O O W W Del - Delete 871 8F16 9716 9F16
/ g BEL o SI W ETB - US
6
KEY:
SHIFT (Note 1)
NORMAL
ALPHA (Note 1)
CONTROL (Note 1)
NOTES:
1. CONTROL overrides SHIFT and ALPHA
= No Response
2. Showing ASCII outputs for all combinations with and without SHIFT, ALPHA LOCK and CONTROL.
3. Drive lines 8, 9, 10 and 11 generate non-ASCII hex values which can be used for special codes.
4-71

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