XRT79L71IB datasheet(49/441 Pages) EXAR

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PRELIMINARY

XRT79L71

1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

REV. P1.0.3

R13

RRING

Receive Input - Negative Polarity Signal:

This input pin, along the RTIP input pin, functions as the Receive DS3/E3 Line

input signal receiver for the XRT79L71.

The user is expected to connect this signal and the RTIP input signal to a 1:1

transformer.

Whenever the RTIP/RRING input pins are receiving a positive-polarity pulse

within the incoming DS3 or E3 line signal, then this input pin will be pulsed to a

"lower-voltage" than the RTIP input pin.

Conversely, whenever the RTIP/RRING input pins are receiving a negative-polar-

ity pulse within the incoming DS3 or E3 line signal, then this input pin will be

pulsed to a "higher-voltage" than the RTIP input pin.

K16

CLKOUT

Receive (Recovered) Clock Output:

This output pin functions as the Receive or recovered clock signal. All Receive

(or recovered) data will output via the RTIP and RRING outputs upon the user-

selectable edge of this clock signal.

PIN #NAME

TYPE

DESCRIPTION

VDD PINS

G10

K10

H14

N14

3.3V Power Supply Pins

R16

CLKVDD

3.3V Clock Power Supply Pin

T16

JAAVDD

3.3V Jitter Attenuator Analog Power Supply Pin

N13

OVDD

3.3V Output Power Supply Pin

R12

REFAVDD

3.3V Reference Analog Power Supply Pin

T13

RXAVDD

3.3V Receive Analog Power Supply Pin

N11

TXDVDD

3.3V Transmit Digital Power Supply Pin

T12

TXAVDD

3.3V Transmit Analog Power Supply Pin

PIN #NAME

TYPE

DESCRIPTION

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