XRT79L73 Datasheet, PDF (66/71 Pages) Exar Corporation – 3 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L73
REV. P1.0.0
PRELIMINARY
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3 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
RECEIVE OVERHEAD DATA OUTPUT INTERFACE
RECEIVE OVERHEAD DATA OUTPUT INTERFACE - TIMING REQUIREMENTS
Table 13, Timing Information for the Receive Overhead Data Output Interface Block
AC ELECTRICAL CHARACTERISTICS (CONT.)
Test Conditions: TA = 25°C, VDD = 3.3V + 5% unless otherwise specified
SYMBOL
PARAMETER
MIN. TYP. MAX. UNITS
Receive Overhead Data Output Interface Timing - Method 1 - Using RxOHClk (see Figure 15)
t_59A ^{Falling edge of RxOHClk to RxOHFrame output}
20
23
ns
CONDITIONS
DS3 Applications
25
t_59B ^{Falling edge of RxOHClk to RxOH output delay}
20
0
ns E3 Applications
23
ns DS3 Applications
25
0
ns E3 Applications
Receive Overhead Data Output Interface Timing - Method 2 - Using RxOHEnable (see Figure 16)
t₆₀ Rising edge of RxOutClk to rising edge of
2
9.4
ns
RxOHEnable delay.
t_60A Rising edge of RxOHFrame to rising edge of
RxOHEnable delay
88
ns ^{DS3 Applications}
224
ns ^{E3, ITU-T G.832}
Applications
t_60B RxOH Data Valid to rising edge of
RxOHEnable delay
28
ns ^{E3, ITU-T G.751}
Applications
88
ns ^{DS3 Applications}
85
ns ^{E3, ITU-T G.832}
Applications
28
ns ^{E3, ITU-T G.751}
Applications
64