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XRT79L72 Datasheet(PDF) 65 Page - Exar Corporation

Part # XRT79L72
Description  2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT79L72 Datasheet(HTML) 65 Page - Exar Corporation

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PRELIMINARY
XRT79L72
2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
REV. P1.0.2
62
RECEIVE PAYLOAD DATA OUTPUT INTERFACE
RECEIVE PAYLOAD DATA OUTPUT INTERFACE - TIMING REQUIREMENTS
TABLE 11: TIMING INFORMATION FOR THE RECEIVE PAYLOAD DATA OUTPUT INTERFACE BLOCK
Test Conditions: TA = 25°C, VDD = 3.3V + 5% unless otherwise specified
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNITS
CONDITIONS
Receive Payload Data Output Interface Timing - Serial Mode Operation (See Figure 17)
t50
Rising edge of RxClk to Payload Data (RxSer) out-
put delay
13
16
ns
ns
DS3 Applications
E3 Applications
t51
Rising edge of RxClk to RxFrame output delay
13
16
ns
ns
DS3 Applications
E3 Applications
t52
Rising edge of RxClk to RxOHInd output delay.
13
16
ns
ns
DS3 Applications
E3 Applications
Receive Payload Data Output Interface Timing - Nibble Mode Operation (see Figure 18)
t53
Falling edge of RxClk to rising edge of RxFrame out-
put delay
2.1
ns
t54
Falling edge of RxClk to rising edge of RxNib[3:0]
output delay
2
ns
FIGURE 17. TIMING DIAGRAM FOR THE RECEIVE PAYLOAD DATA OUTPUT INTERFACE (SERIAL MODE)
XRT79L72 Receive Payload Data I/F Signals
RxClk
RxSer
RxFrame
RxOHInd
Payload[4702]
Payload[4703]
X-Bit
Payload[0]
t50
t51
t52


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