XRT79L72 Datasheet, PDF (54/72 Pages) Exar Corporation – 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L72
REV. P1.0.2
PRELIMINARY
xr
2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
TABLE 4: TIMING INFORMATION FOR THE MICROPROCESSOR INTERFACE, WHEN CONFIGURED TO OPERATE IN THE
IBM POWER PC403 MODE
Test Conditions: TA = 25°C, VCC = 3.3V±5% and 2.5V±5%, unless otherwise specified.
TIMING
DESCRIPTION
MIN.
TYP.
MAX.
t11 Clock high to pOE_L low
11
-
-
t12 Clock high to pOE_L high
1.5
-
4.1
DS3/E3 LIU INTERFACE - LINE SIDE ELECTRICAL CHARACTERISTIC INFORMATION
E3 LINE SIDE PARAMETERS
The XRT79L72 line output at the Transmit Output complies with the pulse template requirements as specified
in ITU-T G.703 for 34.368Mbps operation. The pulse mask as specified in ITU-T G.703 for 34.368Mbps is
shown below in Figure 8.
FIGURE 8. PULSE MASK FOR E3 (34.368MBPS) INTERFACE AS PER ITU-T G.703
17 ns
(14.55 + 2.45)
V = 100%
8.65 ns
Nominal Pulse
50%
10%
0%
10%
14.55ns
12.1ns
(14.55 - 2.45)
20%
TABLE 5: E3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS
PARAMETER
MIN
TYP
TRANSMITTER LINE SIDE OUTPUT CHARACTERISTICS
Transmit Output Pulse Amplitude
(Measured at secondary of the transformer)
0.9
1.0
Transmit Output Pulse Amplitude Ratio
0.95
1.00
Transmit Output Pulse Width
12.5
14.55
Transmit Intrinsic Jitter (without Jitter Attenuator in theTransmit path)
0.01
Transmit Intrinsic Jitter ( with Jitter Attenuator in the Transmit path)
0.02
MAX
1.1
1.05
16.5
0.015
0.03
UNITS
V_pk
ns
UI_PP
UI_PP
51