
xr
XRT73L02M
TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.0.0
15
2.0
TIMING CHARACTERISTICS
FIGURE 3. TYPICAL INTERFACE BETWEEN TERMINAL EQUIPMENT AND THE XRT73L02M (DUAL-RAIL DATA)
Terminal
Equipment
(E3/DS3 or STS-1
Framer)
Exar E3/DS3/STS-1 LIU
Transmit
Logic
Block
TxPOS
TxNEG
TxLineClk
TPData
TNData
TxClk
FIGURE 4. TRANSMITTER TERMINAL INPUT TIMING
TPOS or
TNEG
TTIP or
TRING
TxCLK
t
TSU
t
THO
t
RTX
t
FTX
t
TDY
SYMBOL
PARAMETER
MIN
TYP
MAX
UNITS
TxClk
Duty Cycle
E3
DS3
STS-1
30
50
34.368
44.736
51.84
70
%
MHz
tRTX
TxCLK Rise Time (10% to 90%)
4
ns
tFTX
TxCLKFall Time (10% to 90%)
4
ns
tTSU
TPOS/TNEG to TxCLK falling set up time
3
ns
tTHO
TPOS/TNEG to TxCLK falling hold time
3
ns
tTDY
TTIP/TRINGto TxCLK rising propagation delay time
8
ns