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CDP1871A Просмотр технического описания (PDF) - Intersil
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Компоненты Описание
Список матч
CDP1871A
CMOS Keyboard Encoder
Intersil
CDP1871A Datasheet PDF : 10 Pages
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CDP1871A, CDP1871AC
V
DD
100K
0.1
µ
F
N0-N2
MRD
TPB
21
CONTROL
23
24
34
40
36
DEBOUNCE
CS1,
CS2,
CS3
11
D11
CS4
TPB
CDP1800-SERIES
CPU
CDP1871A
V
DD
SHIFT
39
SHIFT
1
D1
UP TO 11 SETS
OF 8 SWITCHES EACH
BUS0-BUS7
CONTROL
38
CONTROL
ALPHA LOCK
37
ALPHA
NORMAL
8 BIT DATA BUS
BUS0-BUS7
25 32
S1
12
S2
13
S3
14
S4
15
S5
16
S6
17
S7
18
S8
19
FIGURE 1. TYPICAL CDP1800 SERIES MICROPROCESSOR SYSTEM USING THE CDP1871A
CS1 21
CS2 22
CS3 23
CS4 24
TPB 34
CS
SCAN CLOCK
THREE-STAGE
SCAN COUNTER
CONTROL
LOGIC
KEY
V
DD
DETECT
F/F
R
X
DEBOUNCE
36
C
X
R
N
FIVE-STAGE
SCAN COUNTER
BUS ENABLE
C1-C3
C4-C8
THREE-STATE
OUTPUT
BUFFERS
25 BUS 0
32 BUS 7
V
DD
40
V
SS
20
DA 33
RPT 35
STATUS
LATCHES
KEY DOWN
DETECT
LATCH
1 OF 8
R
PD
MUX
R
PD
FROM
KEY BOARD
12
19
SENSE
LINES
II
DECODER/
DRIVERS
TO
KEY BOARD
1
11
DRIVE
DI
LINES
DII
FIGURE 2. CDP1871A BLOCK DIAGRAM
R
PD
R
PD
37
39
38
ALPHA SHIFT CONTROL
4-67
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