XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 13

• Manufacturer Part Number: XRT94L33IB-L
• Description: IC MAPPER DS3/E3/STS-1 504TBGA
• Manufacturer: Exar Corporation

Specifications of XRT94L33IB-L

• Applications: Network Switches
• Interface: Bus
• Voltage - Supply: 3.14 V ~ 3.47 V
• Package / Case: 504-LBGA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

xr
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
P
M2
P1
IN
#
TXLCLKO_R_N
S
IGNAL
REFTTL
N
AME
I/O
O
I
LVPECL
S
T
TTL
IGNAL
YPE
Transmit STS-3/STM-1 Clock – Negative Polarity PECL
Output – Redundant Port:
This output pin, along with TXLCLKO_R_P functions as the
Transmit Clock Output signal.
These output pins are typically used in “High-Speed” Back-Plane
Applications. In this case, outbound STS-3/STM-1 data is output
via the “TXLDATO_R_P/TXLDATO_R_N” output pins upon the
rising edge of this clock signal.
Note:
19.44MHz or 77.76MHz Clock Synthesizer Reference Clock
Input Pin:
The exact function of this input pin depends upon whether the
user enables the “Clock Synthesizer” block or not.
If Clock Synthesizer is Enabled.
If the “Clock Synthesizer” block is enabled, then it will be used to
generate the 155.52MHz, 19.44MHz and/or 77.76MHz clock
signal for the STS-3/STM-1 block. In this mode, the user should
apply a clock signal of either of the following frequencies to this
input pin.
• 19.44 MHz
• 38.88 MHz
• 51.84 MHz
• 77.76 MHz
Afterwards, the user needs to write the appropriate data into the
“Transmit Line Interface Control Register“ (Address Location =
0x0383) in order to (1) configure the Clock Synthesizer Block to
accept any of the above-mentioned signals and generate a
155.52MHz, 19.44MHz or 77.76MHz clock signal, (2) to
configure the Clock Synthesizer to function as the Clock Source
for the STS-3/STM-1 block.
If Clock Synthesizer is NOT Enabled:
If the “Clock Synthesizer” block is NOT enabled, then it will NOT
be used to generate the 19.44MHz and/or 77.76MHz clock
signal, for the STS-3/STM-1 block. In this configuration seting,
the user MUST apply a 19.44MHz clock signal to this input pin.
13
this output pin, along with “TXLCLKO_R_P” functions
as the “Redundant Transmit Output Clock” signal.
For APS (Automatic Protection Switching) purposes,
D
ESCRIPTION
XRT94L33
Rev.1.2.0.