TSI721 datasheet(43/67 Pages) RENESAS

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Tsi721 Datasheet

April 4, 2016

Integrated Device Technology

3.7.4

Level I Long Run Transmitter Specifications

1. For all Load Types: R_Rdin = 100 Ohm +/- 20 Ohm.

2. Load Type 0 with min. T_Vdiff, AC-coupling or floating load.

3. It is suggested that T_SCC22 be -6 dB to be compatible with Level II transmitter requirements.

4. It is suggested that T_Ncm be limited to 5% of T_Vdiff to be compatible with Level II transmitter requirements.

For each baud rate at which the LP-Serial transmitter is specified to operate, the output eye pattern of the transmitter falls

entirely within the unshaded portion of the Transmitter Output Compliance Mask displayed in Figure 7 when measured at the

output pins of the device and the device is driving a 100 Ohm + 5% differential resistive load. The specification allows the

output eye pattern of a LP-Serial transmitter that implements pre-emphasis (to equalize the link and reduce inter-symbol

interference) to only comply with the Transmitter Output Compliance Mask when pre-emphasis is disabled or minimized.

Table 21: Level I Long Run Transmitter AC Timing Specifications

Characteristics

Symbol

Reference

Min

Typ

Max

Units

Baud Rate

T_Baud

Section 9.4.2.2

1.25

3.125

Gbps

Absolute Output Voltage

Section 9.4.2.3

-0.40

2.30

Volts

Output Differential Voltage

(into floating load Rload = 100 Ohm)

T_Vdiff

Section 9.4.2.3

800

1600

mVppd

Differential Resistance

T_Rd

Section 9.4.1.5

100

120

Ohm

Recommended output rise and fall

times

(20% to 80%)

T_tr, T_tf

Differential Output Return Loss

(T_baud/10 < f < T_baud/2)

T_SDD22

Section 9.4.1.6

Differential Output Return Loss

(T_baud/10 < f < T_baud/2)

Common Mode Return Loss

(625 MHz < f < T_baud)

T_TCC22

Section 9.4.1.6

Note 3

Transmitter Common Mode Noise1

T_Ncm

Note 4

mVppd

Output Common Mode Voltage

T_Vcm

Load Type 02

2.1

Multiple output skew, N < 4SMO

1000

Multiple output skew, N > 4

SMO

2UI + 1000

Unit Interval

800

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