GS1661 datasheet(28/84 Pages) SEMTECH

Part #	GS1661

Description	HD/SD SDI Receiver, with Integrated Adaptive Cable Equalizer complete with SMPTE Video Processing

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Manufacturer	SEMTECH [Semtech Corporation]

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28 / 84 page

GS1661 HD/SD SDI Receiver

Data Sheet

53751 - 3

September 2012

28 of 84

Figure 4-2: 27MHz Clock Sources

External Crystal Connection

XTAL1

XTAL2

XTAL1

XTAL2

External Clock Source Connection

16pF

External

Clock

NC

K6

J6

Notes:

1. Capacitor values listed represent the total capacitance,

including discrete capacitance and parasitic board capacitance.

2.XTAL1 serves as an input, which may alternatively accept a 27MHz clock

source.

Table 4-3: Input Clock Requirements

Parameter

Min

Typ

Max

UOM

Notes

XTAL1 Low Level Input Voltage

(Vil)

−−

20% of VDD_IO

V

3

XTAL1 High Level Input

Voltage (Vih)

80% of VDDIO

−−

V3

XTAL1 Input Slew Rate

2

−−

V/ns

3

XTAL1 to XOUT Prop. Delay

(High to Low)

1.3

1.5

2.3

ns

3

XTAL1 to XOUT Prop. Delay

(Low to High)

1.3

1.6

2.3

ns

3

NOTES:

Valid when the cell is used to buffer an external clock source which is connected to the XTAL1 pin, then nothing should be

connected to the XTAL2 pin.

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