HC5503T

FN4506 Rev 2.00

Page 5 of 6

June 2004

Applications Diagram

Typical Component Values

C1 = 0.3F, 30V, 20%.

C2 = 0.01F, 100V,20%.

C3 = 0.01F, 20V, 20%.

C4 = 0.5F, 20V, 20%.

C5 = 0.5

F, 30V, 20%.

RB1 = RB2 = RB3 = RB4 = 150

PTC used as ring generator ballast.

NOTES:

4. Secondary protection diode bridge recommended is a 2A, 200V type.

5. All grounds (AG, BG, and DG) must be applied before VCC or VBAT. Failure to do so may result in premature failure of the part. If a user wishes

to run separate grounds off a line card, the AG must be applied first.

6. Application shows Ring Injected Ringing.

RB4

RING

RING FEED

TIP

VBAT

SLIC

HC5503T

RB2

RB1

RING

RB3

SUBSCRIBER

LOOP

-48V

SYSTEM CONTROLLER

1

9

10

2

TIP FEED

TIP

RX

TX

C1

VBAT BGND DGND AGND

VCC

SHD

13

11

12

6

23

C3

3

VCC

C2

C1

21

24

20

19

18

5

C4

C5

5V

PRIMARY

PROTECTION

(NOTE 4)

PIN NUMBERS GIVEN FOR SOIC PACKAGE.

K1A

PTC

Z1

-48V

RING GENERATOR

RS

7

T3

T2

T1

FIGURE 1. TYPICAL LINE CIRCUIT APPLICATION WITH THE MONOLITHIC SLIC

K1A