ls7215 LSI Computer Systems, Inc., ls7215 Datasheet - Page 7

• Manufacturer Part Number: ls7215
• Description: Programmable Digital Delay Timer
• Manufacturer: LSI Computer Systems, Inc.

7215-072009-7
FIGURE 10. LATCHING WEIGHTING BITS FROM A MCU
(Example showing separate relay and logic supplies)
25pF
25pF
S1
OUTPUT
TRIGGER IN
FIGURE 9. PROGRAMMABLE ACCURATE REAL-TIME DELAY GENERATION
+V
+V
MCU
470k
ƒ
+3V
V
V
DD
SS
NOTE : Crystal Frequency, ƒ = 32,768Hz
IO
IO
IO
Switch: S1 low: Delay increment = 1s; Maximum Delay = 255s
10M
19
1
2
4
5
8
9
6
7
S1 high: Delay increment = 1m; Maximum Delay = 255m
OUT
A
B
TRIG
XTLI
XTLO
PSCLS
RESET
Vss
8
LS7216
11-18
11-18
20
20
WB0-WB7
LOAD
WB0-WB7
LOAD
WB3
WB4
WB5
WB6
WB7
WB0
WB1
WB2
LS7215/16
LS7215/16
V
DD
+3V
V
V
18
17
16
15
12
11
14
13
DD
SS
3
3
8
ODOUT
ODOUT
+3V
V
V
+V
DD
SS
3
8
s = seconds
m = minutes
10
10
+3V
+3V
128s/128m
1s/1m
2s/2m
8s/8m
16s/16m
64s/64m
4s/4m
32s/32m
+18V
+9V