T7630 datasheet(20/210 Pages) AGERE

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Preliminary Data Sheet

T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator II)

October 2000

Lucent Technologies Inc.

Pin Information (continued)

Table 1. Pin Descriptions-Channel 1 and Channel 2 (continued)

* Iu indicates an internal pull-up.

† After RESET is deasserted, the channel is in the default framing mode, as a function of the DS1/CEPT pin.

‡ Asserting this pin low will initially force RDY to a low state.

Symbol

Type*

Description

CH1 CH2

RTIP_RPD

Receive Bipolar Tip. Positive bipolar input data from the receive analog line

isolation transformer.

Receive Positive Rail Data. Valid when the FRAMER pin is strapped to 0 V.

NRZ serial data latched by the rising edge of RLCK. Data rates:

DS1-1.544 Mbits/s; CEPT-2.048 Mbits/s. Optional single-rail NRZ receive

data latched by the rising edge of RLCK.

VDDA

Analog 5 V Power Supply. 5 V ± 5%.

14,

20,

GRNDX

Transmit Line Driver Ground Reference.

TRING

Transmit Bipolar Ring. Negative bipolar output data to the transmit analog

isolation transformer.

VDDXP

Transmit Line Driver 5 V Power Supply. 5 V ± 5%.

TTIP

Transmit Bipolar Tip. Positive bipolar output data to the transmit analog

isolation transformer.

37, 72,

108, 144

VDD

5 V Power Supply. 5 V ± 5%.

143

LOPLLCK

Loss of PLLCK Clock. This pin is asserted high when the PLLCK clock does

not toggle for a 250 µs interval. This pin is deasserted 250 µs after PLLCK

clock restarts toggling.

142

DS1/CEPT

DS1/CEPT. Strap to VDD to enable defaults for DS1 operation. Strap to VSS to

enable defaults for CEPT operation.

141

FRAMER

Framer Mode. Strap to VDD to enable integrated LIU and framer operation.

Strap to VSS to bypass the LIU section; the receive framer is sourced directly

from the RPD, RND, and RLCK pins while the TPD, TND, and TLCK pins are

driven by the transmit framer.

140

3-STATE

3-State (Active-Low). Asserting this pin low forces the channel outputs into a

high-impedance state. Asserting both 3-state pins low forces all outputs into a

high-impedance state.

139

RESET†

Reset (Active-Low). Asserting this pin low resets the channel.

Asserting both RESET pins low resets the entire device including the global

registers.

138

TPD

Transmit Line Interface Positive-Rail Data. This signal is the transmit

framer positive NRZ output data. Data changes on the rising edge of TLCK.

In the single-rail mode, TPD = transmit framer data.

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