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LS7210 Datasheet(PDF) 4 Page - LSI Computer Systems

Part # LS7210
Description  PROGRAMMABLE DIGITAL DELAY TIMER
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Manufacturer  LSI [LSI Computer Systems]
Direct Link  http://www.lsicsi.com
Logo LSI - LSI Computer Systems

LS7210 Datasheet(HTML) 4 Page - LSI Computer Systems

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13
7
OUTPUT
LATCH
TIMER
CONTROL LOGIC
POR
GENERATOR
PRESCALER
÷ 1023
(SEE NOTE)
CLOCK
SELECT
LOGIC
LATCH
LATCH
LATCH
4
6
5
2
1
3
TRIGGER
B
A
OSC
CLOCK
SELECT
EXT
CLOCK
+V
8
9
10
11
12
+V
FIGURE 5. LS7210 BLOCK DIAGRAM
14
OUT
+V
+V
+V
+V
+V
-V
V SS
V DD
WB4
WB3
WB2
WB1
WB0
+V
2
NOTE:
÷ 1023 is standard. Any number from 1 to 1022 can be mask programmed.
7210-020298-4
B
A
TRIG
CS
OSC
EXT
CLK
V DD
V SS
OUT
WB0
WB1
WB2
WB3
WB4
FIGURE 6. ASYMMETRICAL FLASHER
NOTE:
Inputs A, B in Dual-Delay mode. For symmetical flasher tie Pins 8, 9, 10, 11 & 12 to fixed logic level.
8.068 s
323ms
68K
47K
+V
+V
f = 3.17KHz
.005µF
7
6
5
4
2
1
14
13
12
11
10
9
8
3
OUT
OUT
f


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