4

Agere Systems Inc.

Data Sheet

November 2001

with Reverse Battery and Dual Current Limit

L9219A/G Low-Cost Line Interface

Pin Information

Figure 2. 28-Pin PLCC

Table 1. Pin Descriptions

PLCC

Symbol

Type

Description

1

I

Current-Limit Program Input. A resistor to DCOUT sets the dc current limit of the

device. The value of current limit set via this resistor may be increased via logic control

(see state table for additional detail).

2

FB2

—

Polarity Reversal Slowdown. Connect a capacitor to ground to control the rate of bat-

tery reversal.

3

FB1

—

Polarity Reversal Slowdown. Connect a capacitor to ground to control the rate of bat-

tery reversal.

4

—

5 V Power Supply.

5

RCVP

I

Receive ac Signal Input (Noninverting). This high-impedance input controls the ac

differential voltage on tip and ring.

6

RCVN

I

Receive ac Signal Input (Inverting). This high-impedance input controls the ac differ-

ential voltage on tip and ring.

VTX

TXI

VITR

NSTAT

NC

RTSP

RCVN

DCOUT

PR

5

6

7

8

9

10

11

42

1

28

27

3

12

14

15

16

17

18

13

25

24

23

22

21

20

19

28-PIN PLCC

LCTH

RCVP

CF2

RTSN

26

28-PIN PLCC

12-3558 (F)