L3000 datasheet(14/29 Pages) STMICROELECTRONICS

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2) Parallel Mode

This operating mode is enabled connecting pin 33

to a voltagein the rangefrom 4V to 5V. The five wire

have the following functions :

- power down/feeding (EIA), entering at pin 18

- timing (CI), entering at pin 26

- ring (DCLK), entering at pin 21

- on-hook/off-hook(NCS), outgoing at pin 19

- ground-key (DIO), outgoing at pin 20

In this operating mode the signals at the inputs are

immediately executed,without any external clock ti-

ming ; all the internalregisters are bypassed.The in-

formations sent back on pins 19 and 20, display in

real time the setting of internal circuits, that means

line status. In the table 2 the correspondence bet-

ween the interface wires in the parallel mode and

equivalent bit in serial mode is pointed out ; where

there isn’t this correspondence, the internal setting

is shown.

Table 2 : Parallel Mode.

Rif.

Meaning (note 1)

Eq. Bit of Ser. Interf.

Value

EIA

PD/feeding

BIT0R

0 : High Impedance

1 : Low Impedance

Timing

BIT1R

0 : Ring Timing Off

1 : Ring Timing On

DCKL

Ring

BIT2R

0 : No Ring

1 : Ring Injection

BIT3R

0 : Low Amplitude

BIT4R

0 : Normal Polarity

BIT5R

0 : Normal Battery

BIT6R

0 :

Line Curr. = 30mA

BIT7R

NCS

On-hook/off-hook

BIT0T

0 : On-hook

1 : Off-hook

DIO

Ground Key

BIT1T

1 : Long. Curr. < 17mA

0 : Long. Curr. > 17mA

BIT2T

BIT3T

BIT4T

Note :

1. The description of the commands is referred to the system L3030 + LINE INTERFACE module.

DIGITAL INTERFACE ELECTRICAL CHARACTERISTICS

(VDD =+ 5V, VSS = – 5V, Tamb.= 25

oC) (refer to PLCC44 package)

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

STATIC ELECTRICAL CHARACTERISTICS

Vil

Input Voltage at Logical ”0”

Pins 18, 19, 20, 21, 26

0.8

Vih

Input Voltage at Logical ”1”

2.0

Iil

Input Current at Logical ”0”

Vil = 0V

200

µA

Iih

Input Current at Logical ”1”

Vih = 5V

µA

Vol

Output Voltage at Logical ”0”

Pins 19, 20 Iout = – 1mA

0.4

Voh

Output Voltage at Logical ”1”

Pins 19, 20 Iout = 1mA

2.4

Ilk

Tristate Leak. Current

Pin 20 NCS = ”1”

µA

L3000S - L3030

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