XRT7250 datasheet(41/463 Pages) EXAR

41 / 463 page

XRT7250

DS3/E3 FRAMER IC

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REV. 1.1.1

t40

"RxPOS" or "RxNEG" set-up time to falling edge of

"RxLineClk".

(Framer is configured to sample data on "RxPOS"

and "RxNEG" input pins, on the falling edge of "RxLi-

neClk")

3ns

t41

"RxPOS" or "RxNEG" hold time, from falling edge of

"RxLineClk"

(Framer is configured to sample data on "RxPOS"

and "RxNEG" input pins, on the falling edge of "RxLi-

neClk")

5ns

Receive Payload Data Output Inteface Timing - Serial Mode Operation (See Figure 11)

t50

Rising edge of RxClk to "Payload Data" (RxSer) out-

put delay

DS3 Applications

E3 Applications

t51

Rising edge of "RxClk" to "RxFrame" output delay

DS3 Applications

E3 Applications

t52

Rising edge of "RxClk" to "RxOHInd" output delay.

DS3 Applications

E3 Applications

Receive Payload Data Output Interface Timing - Nibble Mode Operation (see Figure 12)

t53

Falling edge of “RxClk” to rising edge of “RxFrame”

output delay

2ns

t54

Falling edge of “RxClk” to rising edge of “RxNib[3:0]”

output delay

1ns

Receive Overhead Data Output Interface Timing - Method 1 - Using RxOHEnable (see Figure 13)

t59A

Falling edge of “RxOHClk” to “RxFrame” output

DS3 Applications

E3 Applications

t59B

Falling edge of “RxClk” to “RxOH” output delay

DS3 Applications

E3 Applications

Receive Overheadf Data Output Interface Timing - Method 2 - Using RxOHEnable (see Figure 14)

t60

Rising edge of "RxOutClk" to rising edge of

"RxOHEnable" delay.

t60A

Rising edge of "RxOHFrame" to rising edge of

"RxOHEnable" delay

910

220

930

240

DS3 Applications

E3, ITU-T G.832

Applications

E3, ITU-T G.751

Applications

AC ELECTRICAL CHARACTERISTICS (CONT.)

Test Conditions: TA = 25(C, VCC = 5.0V + 5% unless otherwise specified

SYMBOL

PARAMETER

MIN.TYP.MAX.UNITS

CONDITIONS

XRT7250 데이터시트(PDF) 41 Page - Exar Corporation

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