APPLICATION AND MODES

The UIC can be used in LT, LT-burst and in NT

mode.

Hereafter a list of the pin bias to set up the de-

sired mode is given.

In LT mode:

Pins

Value

LT

BURST

S0

S1

S2

1

0

0

0

0

In LT burst:

Pins

Value

LT

BURST

S0

S1

S2

1

1

time slot

time slot

time slot

In NT:

Pins

Value

LT

BURST

S0

S1

S2

0

0

0

0

1

Test pins should always be tied to GND

PIN DESCRIPTION

Pin

Name

Function

1

DVSS(input)

Digital Ground.

2

PFOFF(input)

Power feed off. PFOFF=HIGH is coded by the A-bit indication HI

accessible on DOUT. Active in LT mode only.

3

LT(input)

LT/NT mode selection.

4

TEST(input)

Test Mode.

5

DISS(output)

A bit channel driven pin. Active in LT mode only.

6

RESETN(input)

Hardware Reset.

7

DIN(input)

Digital interface input.

8

TSP(input)

Transmit single pulse. 1 KHz single pulse alternating positive and

negative polarity is transmitted.

9

BURST(input)

Burst mode selection. Active in LT mode only.

10

FR(in/out)

8KHz Digital interface frame clock; input in LT and output in NT mode.

11

DOUT(output)

Digital interface output.

12

CL(in/out)

Digital interface bit clock; input in LT and output in NT mode.

13

RD1(output)

Power feeder relay driver.

14

RD2(output)

Power feeder relay driver.

15, 16, 17

S2,S1,S0

Time slot pin strap (. Active in LT mode only.

18

DVDD(input)

5V +/-5% positive digital power supply.

19

AVSS(input)

Analog Ground.

20

LOUT1(output)

Output to the line.

21

AVDD(input)

5V +/-5% positive analog power supply.

22

AGND(input)

Analog Ground.

23

LOUT2(output)

Output to the line.

24,25

LIN1,LIN2(input)

Inputs from the line (UK0).

26, 27

XTAL1,XTAL2(inputs)

System clock input;nominal frequency is 15.36MHz.

28

CLS(output)

Clock output synchronous to the line receive clock at 7.68MHz.

STU2071

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