XRT7250 Datasheet, PDF (41/463 Pages) Exar Corporation – DS3/E3 FRAMER IC

XRT7250 DS3/E3 FRAMER IC
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REV. 1.1.1
AC ELECTRICAL CHARACTERISTICS (CONT.)
Test Conditions: TA = 25(C, VCC = 5.0V + 5% unless otherwise specified
SYMBOL
PARAMETER
MIN. TYP. MAX. UNITS
t_{40 "RxPOS" or "RxNEG" set-up time to falling edge of}
3
ns
"RxLineClk".
(Framer is configured to sample data on "RxPOS"
and "RxNEG" input pins, on the falling edge of "RxLi-
neClk")
t_{41 "RxPOS" or "RxNEG" hold time, from falling edge of} 5
ns
"RxLineClk"
(Framer is configured to sample data on "RxPOS"
and "RxNEG" input pins, on the falling edge of "RxLi-
neClk")
Receive Payload Data Output Inteface Timing - Serial Mode Operation (See Figure 11)
t_{50 Rising edge of RxClk to "Payload Data" (RxSer) out-} 10
11
12
ns
put delay
13
14
15
t_{51 Rising edge of "RxClk" to "RxFrame" output delay}
10
11
12
ns
CONDITIONS
DS3 Applications
E3 Applications
DS3 Applications
13
14
15
E3 Applications
t_{52 Rising edge of "RxClk" to "RxOHInd" output delay.}
10
11
12
ns DS3 Applications
13
14
15
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
2
ns
t₅₄ Falling edge of “RxClk” to rising edge of “RxNib[3:0]”
output delay
1
ns
Receive Overhead Data Output Interface Timing - Method 1 - Using RxOHEnable (see Figure 13)
t_59A Falling edge of “RxOHClk” to “RxFrame” output
20
25
ns DS3 Applications
25
t_59B Falling edge of “RxClk” to “RxOH” output delay
20
28
E3 Applications
25
ns DS3 Applications
25
28
E3 Applications
Receive Overheadf Data Output Interface Timing - Method 2 - Using RxOHEnable (see Figure 14)
t_{60 Rising edge of "RxOutClk" to rising edge of}
2
"RxOHEnable" delay.
7
ns
t_{60A Rising edge of "RxOHFrame" to rising edge of}
910
"RxOHEnable" delay
220
930
ns DS3 Applications
240
ns E3, ITU-T G.832
Applications
25
32
ns E3, ITU-T G.751
Applications
22