2-122

MH88612K

Preliminary Information

Figure 2 - Pin Connections

Pin Description

Pin #

Name

Description

1TF

Tip Feed. Connects to external diode for protection. Internally connected to pin 21.

2RF

Ring Feed (Input). is normally connected to ring relay for negative battery feed voltage

and ringing voltage input.

3

IC/NC

No Connections to be made to this pin, used for internal connection.

4

IC/NC

No Connections to be made to this pin, used for internal connection.

5

IC/NC

No Connections to be made to this pin, used for internal connection.

6

IC/NC

No Connections to be made to this pin, used for internal connection.

7

IC/NC

No Connections to be made to this pin, used for internal connection.

8

TIP

Connects to the “Tip” lead of the telephone line.

9

IC/NC

No Connections to be made to this pin, used for internal connection.

10

RING

Connects to the “Ring” lead of the telephone line.

11

RC2

Relay Control 2 (Input). Active high to reverse Tip/Ring.

12

LPGND

GNDA.

13

IC/NC

No Connections to be made to this pin, used for internal connection.

14

VR

Voice Receive (Input) is the 4-wire analog signal to the SLIC.

15

VRef

Voltage Reference (Input). to set the constant current feed to the subscriber line.

grounded for normal 25mA loop current.

16

CAP

Connects external capacitor to ground for ring trip.

17

SHK

Switch Hook Detect (Output). Active high

18

GNDA

Analog Ground (0V)

19

VEE

Negative Power Supply Voltage (-5V).

20

VDD

Positive Power Supply Voltage (+5V).

21

TF

Tip Feed. Connect an external diode for protection. Internally connected to pin 1.

22

VBat

Negative Battery Feed Supply Voltage (-48V).

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

TF

RF

IC

IC

IC

IC

IC

TIP

IC

RING

RC2

LPGND

IC

VR

VRef

CAP

SHK

GNDA

VEE

VDD

20

21

22

23

24

25

26

27

28

29

30

TF

VBat

RV

PD

VX

IC

IC

VRLY

RC1

RD1