GS2985 datasheet(11/45 Pages) SEMTECH

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GS2985 Multi-Rate SDI Reclocker with Equalization &

De-emphasis

Data Sheet

36663 - 5

July 2012

11 of 45

Proprietary & Confidential

2.3 AC Electrical Characteristics

VIH (2.5V operation)

−

VOUT

≥VOH, min

1.7

−

VDD

+0.3

VIH (3.3V operation)

VOUT

≥VOH, min

−

VDD

+0.3

IIN

−

VIN = 0V or VIN = VDD

−

+/-10

+/-20

μA

VOL (2.5V operation)

−

VDD = min, IOL = 100

μA

−−

0.4

VOL (3.3V operation)

VDD = min, IOL = 100

μA

−−

0.4

VOH (2.5V operation)

−

VDD = min, IOH = -100

μA

2.1

−−

VOH (3.3V operation)

VDD = min, IOH = -100

μA

VDD

-0.4

−−

Hysteresis Voltage (SPI inputs)

−

2.5V operation

−

350

−

3.3V operation

−

420

−

Table 2-1: DC Electrical Characteristics (Continued)

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Table 2-2: AC Electrical Characteristics

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Notes

Serial Input Data Rate

(for reclocking)

DRSDO

−

0.27

−

2.97

Gb/s

−

Serial Input Data Rate

(bypass)

−

2.97

Gb/s

−

SPI Operating Speed

−−

−

MHz

−

Input Voltage Swing

ΔVSDI

set ATTEN_EN = 1 for

ΔVSDI>1V

100

2000

mVp-pd

−

Output Voltage Swing

ΔVOD

default

300

400

500

mVp-pd

−

see DRIVER_1 register

(0x01) addresses 8 & 9 in

4.15.14 Host Register

Map.

600

800

1000

mVp-pd

−

Input Trace Equalization

−

LOW

Recommended setting for 0 to 10

inches of FR4

−

MED

Recommended setting for 10 to 20

inches of FR4

−

HIGH

Recommended setting for >20 inches

of FR4

−

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