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LS7220 数据表(PDF) 3 Page - LSI Computer Systems

部件名 LS7220
功能描述  DIGITAL LOCK FOR AUTOMOTIVE IGNITIONS
PDF  4 Pages
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制造商  LSI [LSI Computer Systems]
网页  http://www.lsicsi.com
标志 LSI - LSI Computer Systems

LS7220 数据表(HTML) 3 Page - LSI Computer Systems

  LS7220 Datasheet HTML 1Page - LSI Computer Systems LS7220 Datasheet HTML 2Page - LSI Computer Systems LS7220 Datasheet HTML 3Page - LSI Computer Systems LS7220 Datasheet HTML 4Page - LSI Computer Systems  
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SENSE Input
I1
I2
LOCK
LOCK STATUS
SAVE Input
SAVE STATUS
LOCK Input
FIGURE 3.
LS7220 TIMING DIAGRAM
TPW
T PW
TPW
TPW
TCE
TSE
TSE
TSE
TSE
TSD
T SD
I3
I4
6
5
4
3
2
13
12
UNSELECTED
KEYS (RESET)
SEQUENTIAL
DETECTOR
INCORRECT
SEQUENCE
CORRECT
SEQUENCE
SEQUENTIAL
MEMORY
POWER
ON
RESET
SAVE
MEMORY
LOGIC "1"
LEVEL
RESTORE
LOCK
LOCK STATUS
8
10
SAVE STATUS
CONVENIENCE DELAY
-
+
V SS
C
SELECTED KEYS (IN SEQUENCE)
I 1
I 2
I3
I4
1
14
9
V SS
V DD
(+V)
(-V)
V SS
V SS
V SS
V SS
V DD
11
7
R
S
Q
R
S
Q
Q
SAVE
INPUT
LOCK
INPUT
Capacitor
Discharge
Current
FIGURE 4. LS7220 BLOCK DIAGRAM
SENSE
INPUT
(ENABLE)
R
External Capacitor
FIGURE 2. CONVENIENCE DELAY TIME vs POWER SUPPLY
(with External Capacitor C, Pin 12)
Typical Curve for C = 5µF
TA = 25
°C
(V SS-V DD), Volts
5
10
15
18
8
4
6
2
14
0
12
10
7220-012703-3



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