FIGURE 9. PROGRAMMABLE ACCURATE REAL-TIME DELAY GENERATION

17

10

11

12

13

14

15

16

18

WB0

WB1

WB2

WB3

WB4

WB5

WB6

WB7

1

2

3

4

10M

A

B

TRIG

XTLI

5

XTLO

6

PSCLS

7

RESET

8

9

OUT

Vss

OUTPUT

+V

S1

+V

470k

ƒ

25pF

25pF

TRIGGER IN

+V

1s/1m

2s/2m

4s/4m

8s/8m

16s/16m

32s/32m

64s/64m

128s/128m

NOTE : Crystal Frequency, ƒ = 32,768Hz

Switch: S1 low: Delay increment = 1s; Maximum Delay = 255s

S1 high: Delay increment = 1m; Maximum Delay = 255m

LS7212N

s = seconds

m = minutes

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.

7211N-052606-7