L8567 datasheet(4/42 Pages) AGERE

4 / 42 page

Lucent Technologies Inc.

Data Sheet

August 1999

People’s Republic of China Applications

L8567 SLIC for

Description (continued)

General (continued)

This device uses a latched parallel data input interface

and a gated parallel output data interface. Level-sensi-

tive data latches are used for state control inputs, and

level-sensitive control gates are used for supervision

outputs. Latch and gate control are through an

ENABLE pin. When the ENABLE pin is high, input data

is latched and the SLIC will not respond to changes at

its logic input. When ENABLE is low, input control data

will flow through the latch. Valid supervision data will

appear at the NSTAT and NTSD outputs only when

ENABLE is low. In this manner, the data input and data

output of multiple SLICs can be serviced by a single

control input or output. The L8567 is designed to be

controlled/supervised using control/supervision outputs

and inputs from the T7507 codec.

Three relay drivers are also included. These drivers are

meant to drive electromechanical relays (EMRs). State

control of the relay drivers is via latched parallel data

inputs. Like the B0/B1 and supervision data, control

leads from the T7507 codec drive these inputs. The

T7507 relay driver control outputs are meant to control

the associated control input on all four of the L8567

SLICs associated with the T7507 codec.

If an L7583 solid-state switch is used (instead of

EMRs), the data control outputs from the T7507 codec

will drive the latched state control inputs of the L7583

directly. Again, one data control output from the T7507

will drive the corresponding data input on four channels

of the L7583. In the case of using the L7583, tie RD1I,

RD2I, and RD3I relay driver control inputs of the L8567

to ground.

Included are two supervision outputs. Both supervision

outputs are the wire-OR of the loop closure and ring

trip detectors. One (NSTAT) is used as a data control

output and is gated via the EN input. The other (NLED)

can be used to drive an LED to indicate loop states.

The NLED driver is an open collector output, so multi-

ple outputs may be used to drive a single LED. NLED is

not gated, so valid supervision data appears at NLED

regardless of the state of EN. NLED can be used as an

alternative, nongated, data control output.

The L8567 is available in a 32-pin PLCC or 44-pin

PLCC package.

Application for People’s Republic of China

This SLIC may be used with any commercially avail-

able codec; however, when used with the Lucent Tech-

nologies Microelectronics Group T7507, the two

devices form a complete line circuit optimized for

requirements in the People’s Republic of China. The ac

interface between the two components is extremely

simple, requiring only a single capacitor in the transmit

direction and a short-circuit connection, using no exter-

nal components, in the receive direction.

The complex 200

Ω + 680 Ω || 100 nF termination and

hybrid balance is digitally synthesized by the T7507

codec. Additionally, the tip/ring to PCM (transmit) gain

is fixed and set digitally by the T7507 codec at

0 dB. The PCM to tip/ring (receive) gain is also digitally

set by the T7507 codec and is programmable via a bit

in the codec serial data control stream to either

–3.5 dB or –7.0 dB.

The control interfaces of the L8567 and T7507 are

designed for compatibility with each other.

Both the T7507 codec and L8567 SLIC require only

battery and +5 V to operate. When both devices are

used, no –5 V supply is required.

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