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LS7213R Datasheet(PDF) 4 Page - LSI Computer Systems

Part # LS7213R
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

LS7213R Datasheet(HTML) 4 Page - LSI Computer Systems

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7213R-120205-4
A
B
D
C
E
F
G
H
OUT1(DLD)
OUT1(OFD)
OUT1(OND)
OUT1(OST)
RESET
TRIG
A. Turn-on delay in OND and DLD modes; Pulse-width in OST mode.
B. Turn-off delay in OFD and DLD modes.
C. Pulse-width extended by re-trigger in OST mode. No effect in
OND and DLD modes because TRIG switches back low before
turn-on delay has timed out.
D. Turn-off delay in OFD mode.
FIGURE 3.
MODE ILLUSTRATION
WITH TRIG, OUT1 AND RESET
E. Turn-on delay in OND and DLD modes; pulse-width in OST mode.
F. No effect in OND, OFD and DLD modes because of Trig’s
switching back to opposite levels.
G. Time-out aborted and OUT1 forced high by RESET.
H. After the removal of RESET, OUT1 switches to the inverse polarity
of TRIG immediately (OFD) or after the timeout (OND, DLD).
No effect in OST.
The table below shows the delays obtained with the
following components R1 = 56k
Ω, R2 = 500kΩ and
C2 = 0.002µF. At any scale factor, the delay changes
from minimum to maximum as the potentiometer, R2
is varied from minimum to maximum.
D3 D2 D1
TIMING RANGE
0
0
0
0.1 sec - 1 sec.
0
0
1
1 sec. - 10 sec.
0
1
0
10 sec - 100 sec.
0
1
1
0.1 min. to 1 min.
1
0
0
1 min. - 10 min
1
0
1
10 min. - 100 min.
1
1
0
0.1 hr. - 1 hr.
1
1
1
1 hr. - 10 hr.
C1 = 0.22µF, produces flash pulses of 0.1 sec
duration at Out2
LATCH
LATCH
LATCH
LATCH
LATCH
D3
D2
D1
RC
A
TRIGGER
RANGE
DECODER
TIMER
OSC
CONTROL LOGIC
POR
GENERATOR
OUTPUT
DRIVER
OUT1
OUT2
LATCH
B
LATCH
FLASHEN
FIGURE 2. LS7213R BLOCK DIAGRAM
1
2
3
10
4
5
6
8
+V
-V
14
VDD
7
Vss
OUTPUT
DRIVER
OSC
CAP
9
13
12
RESET
11
1
2
3
4
5
7
6
D3
D2
D1
A
B
FLASHEN
Vss (-V)
V DD (+V)
14
OUT1
13
OUT2
12
RESET
11
RC
10
CAP
9
8
RESET INPUT
FIGURE 4. TYPICAL APPLICATION WITH OUT1 AS
RELAY DRIVE AND OUT2 AS FLASHER
TRIGGER INPUT
LS7213R
+5V
LED
C2
C1
300
R1
R2
TRIGGER


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