Data Sheet

September 2001

Full-Feature SLIC and Ringing Relay for TR-57 Applications

L9313 Line Interface and Line Access Circuit

10

Agere Systems Inc.

Table 1. Pin Descriptions (continued)

Operating States

Input State Coding

Data control is via a parallel latched data control scheme. Data latches are edge-level sensitive. Data is latched in

when the LATCH control input goes low. Data must be set up 200 ns before LATCH goes low and held 50 ns after

LATCH goes high. While LATCH is low, the user should not change the data control inputs at B0, B1, and B2. The

data control inputs at B0, B1, and B2 may only be changed when LATCH is high. NSTAT supervision output is not

controlled by the LATCH control input.

Table 2. Control States

Pin Symbol Type

Name/Function

35

ICM

I

Common-Mode Current Sense. To program tip or ring ground sense threshold, connect

a resistor to ground and connect a capacitor to AGND to filter 50 Hz/60 Hz. If unused, the

pin is connected to ground.

36

VTX

O

Tip/Ring Voltage Output. This output is a voltage that is directly proportional to the differ-

ential tip/ring current. A resistor from this node to ITR sets the device transimpedance.

Gain shaping for termination impedance with a COMBO I codec is also achieved with a

network from this node to ITR.

37

ITR

I

Transmit Gain. A current output which is proportional to the differential current flowing

from tip to ring. Input to AX amplifier. Connect a resistor from this node to VITR to set

transmit gain to 300

Ω. Gain shaping for termination impedance with a COMBO I codec is

also achieved with a network from this node to VITR.

39

TXI

I

Transmit ac Input (Noninverting). Connect a 0.1

µF capacitor from this pin to VTX for dc

blocking.

40

VITR

O

Transmit ac Output Voltage. The output is a voltage that is directly proportional to the dif-

ferential ac tip/ring current. This output is connected via a proper interface network to the

codec.

41

RCVP

I

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

ferential voltage on tip and ring.

42

RCVN

I

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

tial voltage on tip and ring.

43

AGND

G

44

P

5 V Analog Power Supply. 5 V supply for analog circuitry.

B2

B1

B0

RESET

State

0001

Scan

0011

Powerup, forward battery

0101

Powerup, reverse battery

0111

Unassigned

1001

Ring

1011

Tip amp

1101

Ring amp

1111

Disconnect, break before make

X

X

X

0

Disconnect, break before make