DS3153 datasheet(11/60 Pages) DALLAS

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DS3151/DS3152/DS3153/DS3154 Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs

11 of 60

Table 4-B. Transmitter Pin Descriptions

NAME

I/O

FUNCTION

TCLKn

Transmitter Clock. A DS3 (44.736MHz

±20ppm), E3 (34.368MHz ±20ppm), or STS-1 (51.840MHz

±20ppm) clock should be applied at this signal. Data to be transmitted is clocked into the device at

TPOS/TDAT and TNEG either on the rising edge of TCLK (TCINV = 0) or the falling edge of TCLK

(TCINV = 1). See Section 7 for additional details.

TPOSn/

TDATn

Transmitter Positive AMI/Transmitter Data. When the transmitter is configured to have a bipolar

interface (TBIN = 0), a positive pulse is transmitted on the line when TPOS is high. When the

transmitter is configured to have a binary interface (TBIN = 1), the data on TDAT is transmitted after

B3ZS or HDB3 encoding. TPOS/TDAT is sampled either on the rising edge of TCLK (TCINV = 0) or

on the falling edge of TCLK (TCINV = 1).

TNEGn

Transmitter Negative AMI. When the transmitter is configured to have a bipolar interface (TBIN = 0), a

negative pulse is transmitted on the line when TNEG is high. When the transmitter is configured to

have a binary interface (TBIN = 1), TNEG is ignored and should be wired either high or low. TNEG is

sampled either on the rising edge of TCLK (TCINV = 0) or on the falling edge of TCLK (TCINV = 1).

TXPn,

TXNn

Transmitter Analog Outputs. These differential AMI outputs are coupled to the outbound 75

W coaxial

cable through a 2:1 step-down transformer (Figure 1-1). These outputs can be tri-stated using the

TTS

pin or the TTS or TPS configuration bits.

TTSn

Transmitter Tri-State Enable (Active Low).

TTS tri-states the transmitter outputs (TXP and TXN). This

feature supports applications requiring LIU redundancy. Transmitter outputs from multiple LIUs can be

wire-ORed together, eliminating external switches. The transmitter continues to operate internally

when

TTS is active.

0 = tri-state the transmitter output driver

1 = enable the transmitter output driver

TDMn

Transmitter Driver Monitor (Active Low, Open Drain).

TDM reports the status of the transmit driver

monitor. When the transmit driver monitor detects a faulty transmitter,

TDM is driven low. TDM

requires an external pullup to VDD.

TDSAn,

TDSBn

Transmitter Data Select. These inputs select the source of the transmit data. See Table 4-F for details.

TLBOn

Transmitter Line Build-Out Enable. TLBO indicates cable length for waveform shaping in DS3 and

STS-1 modes. TLBO is ignored for E3 mode and should be wired high or low.

0 = cable length

³ 225ft

1 = cable length < 225ft

TJAn

Transmitter Jitter Attenuator Enable

0 = remove jitter attenuator from the transmitter path

1 = insert jitter attenuator into the transmitter path

(Note that TJA = 1 takes precedence over RJA = 1.)

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