2

SL490B

ELECTRICAL CHARACTERISTICS

These characteristics are guaranteed over the following conditions (unless otherwise stated):

Characteristic

Value

Min.

4

4

17

17

2,3

2

3

5-15

18

16

2,3

2,3

2,3

2,3

2,3

2,3

4·1

20

15

1·4

Pin

9·5

40

30

Typ.

Max.

16

10

4·9

1

1

1

5

80

60

610

610

64

64

1·6

Units

mA

µA

V

mA

V

V

V

k

Ω

k

Ω

k

Ω

%

%

%

%

Unloaded

R1 = 15k

Ω

R1 = 60k

Ω

Derived by counting

Conditions

Fig. 4

Operating supply current

Standby supply current

Output voltage swing

Output voltage

Output voltage

Keypad switch resistance

Carrier time constant resistor, R2

PPM time constant resistor, R1

using fixed timing components

1

10V

10

11

12

13

14

15

16

17

18

9

8

7

6

5

4

3

2

1

SL490B

C2

680p

C1

0·22

µ

1

µ

R2

100k

=

5k

EDC

000

001

010

011

100

101

110

111

BA

00

BA

01

BA

10

BA

11

0·1

µ

0·1

µ

1·8k

900







TO

SCOPE

1

—

≈ 0·7 C2 R2

40k

15k

R1

Fig. 4 Test circuit

1

0

1

1

0

1

0

Fig. 3 PPM word notation and timing definitions

peak value ,1ms