L3000 datasheet(15/29 Pages) STMICROELECTRONICS

15 / 29 page

DIGITAL INTERFACE ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

DYNAMIC ELECTRICAL CHARACTERISTICS

fclk

Clock Frequency

600

kHz

Tr, Tf

Clock Rise and Fall Time

Twh, Twl

Clock Impulse Width

750

Tis

CI to NCS Set up Time

300

Tec

”0” EIA to DCKL Set up Time

300

Tsc

DCKL to NCS Delay (+ edge)

300

Tsd

Data in Set up Time

Thd

Data in Hold Time

800

Tcs

NCS to DCKL Hold Time

800

Tca

”0” EIA to DCKL Hold Time

900

Tac

”1” EIA to DCKL Set up Time

400

Tzd

Data out to ”0” NCS Delay

600

Tce

”1” EIA to DCKL Hold Time

900

Tdz

Data out to ”1” NCS Delay

500

Tdd

Data out to DCKL Delay

1500

Tsi

”0” CI to NCS Hold Time

300

OPERATION DESCRIPTION

To set SLIC in operation the following parameters

have to be defined :

- the DC feedingresistance RFS, definedas the re-

sistance of each side of the traditional feeding sy-

stem (most common values are 200, 400 or 500

ohm).

- the AC impedanceat line terminals, ZML, to which

the return loss measurement references.It can be

real (typically 600 ohm) or complex.

- the equivalent AC impedance of the line Zline,

when evaluating the trans hybrid loss (2/4 wire

conversion). It is usually a complex impedance.

- the ringing signal frequency Fr (ST SLIC allows

frequency ranging from 16 to 66Hz).

- the metering pulse frequency Ft (two values are

possible : 12kHz or 16kHz).

- the value of the two resistors RP1/RP2 in series

with the line terminals ; main purpose of the a.m.

resistors is to allow primary protection to fire. ST

suggest the minimum value of 50 ohm for each

side.

On this assumptions,the following componentlist is

defined.

L3000S - L3030

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