ls7211 LSI Computer Systems, Inc., ls7211 Datasheet - Page 7

• Manufacturer Part Number: ls7211
• Description: Programmable Digital Delay Timer
• Manufacturer: LSI Computer Systems, Inc.

7211-012703-7
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
16s/16m
32s/32m
64s/64m
128s/128m