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.

Pin

Rif.

Meaning (note 1)

Eq. Bit of Ser. Interf.

Value

18

EIA

PD/feeding

BIT0R

0 : High Impedance

1 : Low Impedance

26

CI

Timing

BIT1R

0 : Ring Timing Off

1 : Ring Timing On

21

DCKL

Ring

BIT2R

0 : No Ring

1 : Ring Injection

BIT3R

0 : Low Amplitude

BIT4R

0 : Normal Polarity

BIT5R

0 : Normal Battery

BIT6R

0 :

1:

Line Curr. = 30mA

BIT7R

19

NCS

On-hook/off-hook

BIT0T

0 : On-hook

1 : Off-hook

20

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

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

STATIC ELECTRICAL CHARACTERISTICS

Vil

Input Voltage at Logical ”0”

Pins 18, 19, 20, 21, 26

0

0.8

V

Vih

Input Voltage at Logical ”1”

2.0

5

V

Iil

Input Current at Logical ”0”

Vil = 0V

200

µA

Iih

Input Current at Logical ”1”

Vih = 5V

10

µA

Vol

Output Voltage at Logical ”0”

Pins 19, 20 Iout = – 1mA

0.4

V

Voh

Output Voltage at Logical ”1”

Pins 19, 20 Iout = 1mA

2.4

V

Ilk

Tristate Leak. Current

Pin 20 NCS = ”1”

10

µA

L3000S - L3030

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