LS7212N LSI [LSI Computer Systems], LS7212N Datasheet - Page 7

• Manufacturer Part Number: LS7212N
• Description: PROGRAMMABLE DIGITAL DELAY TIMER
• Manufacturer: LSI [LSI Computer Systems]

7211N-052606-7
FIGURE 9. PROGRAMMABLE ACCURATE REAL-TIME DELAY GENERATION
25pF
25pF
S1
OUTPUT
TRIGGER IN
+V
+V
470k
ƒ
NOTE : Crystal Frequency, ƒ = 32,768Hz
Switch: S1 low: Delay increment = 1s; Maximum Delay = 255s
10M
18
2
4
9
1
5
6
7
8
S1 high: Delay increment = 1m; Maximum Delay = 255m
OUT
TRIG
XTLO
PSCLS
RESET
A
B
XTLI
Vss
LS7212N
WB0
WB1
WB2
WB3
WB4
WB5
WB6
WB7
The information included herein is believed to be
accurate and reliable. However, LSI Computer Systems,
Inc. assumes no responsibilities for inaccuracies, nor for
any infringements of patent rights of others which may
result from its use.
V
DD
17
16
15
14
13
12
11
10
3
+V
m = minutes
s = seconds
1s/1m
2s/2m
4s/4m
8s/8m
16s/16m
32s/32m
64s/64m
128s/128m