XRT7245
DS3 UNI FOR ATM
á
PRELIMINARY
REV. 1.03
28
t
25
Delay from rising edge of TxOHFrame
signal to rising edge of TxOHClk signal
ns
t
26
TxOH Data Setup time to rising edge
of TxOHClk signal
ns
t
27
TxOH Data Hold time from rising edge
of TxOHClk signal
ns
t
28
TxOHIns signal setup time to rising
edge of TxOHClk
ns
t
29
TxOHIns signal hold time from rising
edge of TxOHClk
ns
Transmit DS3 Framer (LIU Interface Port)—See Figures 100 and 101
t
30
Delay time of data on TxPOS or TxNEG,
following the rising edge of the
TxLineClk
0.7
2.0
ns
Transmit DS3 Framer is configured
to update TxPOS and TxNEG on
the rising edge of TxLineClk.
t
31
Delay time of data on TxPOS or
TxNEG following the falling edge
of the TxLineClk
0.7
1.5
ns
Transmit DS3 Framer is configured
to update TxPOS and TxNEG on
the falling edge of TxLineClk.
fTxLineClk Clock frequency of TxLineClk
44.736
MHz
t
32
Period of TxLineClk clock signal
ns
t
33
Bit Period of data on TxPOS or
TxNEG pins
ns
Receive DS3 Framer (Serial Output Port)—See Figure 102
fRxOHClk Frequency of RxOHClk signal
Hz
t
34
Period of RxOHClk clock signal
ns
t
35
Delay Time from rising edge of
RxHClk to RxOHFrame signal
ns
t
36
Delay Time from rising edge of
RxOHClk to valid data at RxOH
ns
t
37
Bit Period of data at RxOH
ns
Receive DS3 Framer (LIU Interface Port)—See Figures 103 and 104
t
38
RxPOS/RxNEG data Setup Time to
rising edge of RxLineClk
6
ns
Receive DS3 Framer is configured
to sample RxPOS and RxNEG on
the rising edge of RxLineClk.
t
39
RxPOS/RxNEG data Hold Time from
rising edge of RxLineClk
3
ns
Receive DS3 Framer is configured
to sample RxPOS and RxNEG on
the rising edge of RxLineClk.
t
40
RxPOS/RxNEG data Setup Time to
falling edge of RxLineClk
6
ns
Receive DS3 Framer is configured
to sample RxPOS and RxNEG on
the falling edge of RxLineClk.
t
41
RxPOS/RxNEG data Hold Time from
falling edge of RxLineClk
3
ns
Receive DS3 Framer is configured
to sample RxPOS and RxNEG on
the falling edge of RxLineClk.
AC ELECTRICAL CHARACTERISTICS (CONT’D)
Test Conditions: T
A
= 25°C, V
CC
= 5.0V ± 5% unless otherwise specified
S
YMBOL
P
ARAMETER
M
IN
.
T
YP
.
M
AX
.
U
NITS
C
ONDITIONS