LS7212 LSI Computer Systems, LS7212 Datasheet - Page 7

• Manufacturer Part Number: LS7212
• Description: PROGRAMMABLE DIGITAL DELAY TIMER
• Manufacturer: LSI Computer Systems

FIGURE 9. PROGRAMMABLE ACCURATE REAL-TIME DELAY GENERATION
25pF
25pF
TRIGGER IN
+V
OUTPUT
+V
470K
NOTE : Crystal Frequency, ƒ = 32,768Hz
ƒ
S1
Switch: S1 low: Delay increment = 1s; Maximum Delay = 255s
10M
S1 high: Delay increment = 1m; Maximum Delay = 255m
18
1
2
4
5
6
7
8
9
A
B
TRIG
XTLI
XTLO
PSCLS
RESET
Vss
OUT
LS7212
WB0
WB1
WB2
WB3
WB4
WB5
WB6
WB7
V
DD
17
16
15
14
13
12
11
10
3
+V
s = seconds
m = minutes
1s/1m
2s/2m
4s/4m
8s/8m
1 6 s / 1 6 m
3 2 s / 3 2 m
6 4 s / 6 4 m
1 2 8 s / 1 2 8 m