MH88422

Preliminary Information

2-14

Figure 2 - Pin Connections

Notes:

1. Variant 1, 4 BD-1 - pins 10,12, & 21 are cropped short. Pin 23 is not fitted.

2. Variant 2 - pin 23 is cropped short. Pins 10, 12 & 21 are not fitted.

3. Variant 3 - pins 12 and 21 are cropped short. Pins 10 and 23 are not fitted.

Pin Description

Pin #

Name

Description

1

VDD

Positive Supply Voltage. +5V.

2, 4, 6,

8, 9

IC

Internal Connection. This pin is cropped short.

3

AGND

Analog Ground. 4-Wire Ground. Normally connected to System Ground.

5

LC

Loop Control (Input). A logic 0 activates internal circuitry which provides a line

termination across Tip and Ring. Used for seizing the line and dial pulsing.

7

RVLC

Ringing Voltage and Current Detect (Output). Indicates the status of loop current

and ringing voltage.

10, 12

IC/NP

Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted,

depending on the variant. See Note 1

11

VX

Transmit (Output). Analog output to modem/fax chip set.

13

VR

Receive (Input). Analog input to modem/fax chip set.

14, 17

IC

Internal Connection. This pin is cropped short.

15, 19

NP

No Pin Fitted.

16

RING

Ring Lead. Connects to the "Ring" lead of a telephone line.

18

TXIN

Dummy Ringer Connection. Connects to the "Ring" lead of a telephone line through a

dummy ringer capacitor.

20

TF

Tip Feed. Connects externally to the RLS pin.

21, 23

IC/NP

Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted,

depending on the variant. See Note 1

24

RLS

Ringing Loop Sense. Connects externally to the TF pin.

25

IC

Internal Connection. This pin is cropped short.

26

TIP

Tip Lead. Connects to the "Tip" lead of a telephone line.

VDD

IC

AGND

IC

LC

IC

RVLC

IC

IC/NP

VX

IC/NP

IC

1

2

3

4

5

6

7

8

9

10

11

12

15

16

17

18

26

25

24

23

22

21

20

19

13

14

VR

TIP

IC

RLS

IC/NP

IC

IC/NP

TF

NP

IC

RING

NP

TXIN

IC