SI5321-H-BL Silicon Laboratories Inc, SI5321-H-BL Datasheet - Page 26

• Manufacturer Part Number: SI5321-H-BL
• Description: IC CLOCK MULT SONET/SDH 63-PBGA
• Manufacturer: Silicon Laboratories Inc

Specifications of SI5321-H-BL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Si5321
26
*Note: The LVTTL inputs on the Si5321 device have an internal pulldown mechanism that causes the input to default to a
Pin #
H5
H8
B3
A3
A2
B2
logic low state if the input is not driven from an external source.
FRQSEL[0]
FRQSEL[1]
FRQSEL[2]
Pin Name
FEC[0]
FEC[1]
FEC[2]
Table 10. Si5321 Pin Descriptions (Continued)
I/O
I*
I*
Signal Level
LVTTL*
LVTTL*
Rev. 2.5
Clock Output Frequency Range Select.
Select the frequency range of the clock output, CLK-
OUT. (See Table 3 on page 7.)
001 = 19 MHz Frequency Range.
000 = 39 MHz Frequency Range.
100 = 78 MHz Frequency Range.
010 = 155 MHz Frequency Range.
101 = 311 MHz Frequency Range.
011 = 622 MHz Frequency Range.
110 = 1.25 GHz Frequency Range.
111 = 2.5 GHz Frequency Range.
FEC Selection.
Enables or disables scaling of the input-to-output
frequency multiplication factor for FEC clock rate
compatibility.
The frequency of the CLKOUT output is a multiple of
the frequency of the CLKIN input. Selecting the
clock input range, the clock output range, and the
FEC scaling factor sets the input-to-output fre-
quency multiplication factor. The clock output fre-
quency is selected using the FRQSEL[2:0] pins. The
clock input frequency is selected using the INFRQ-
SEL[2:0] pins. Scaling factors of 255/238, 238/255,
255/237, 237/255, 66/64, or 64/66 may be selected
for FEC operation using the FEC[2:0] control pins as
indicated below. Scaling factors of 255/237, 237/
255, 66/64, or 64/66 require that the input clock rate
be in the 155 MHz or higher range.
000 = No FEC scaling.
001 = 255/238 FEC scaling.
010 = 238/255 FEC scaling.
011 = Reserved.
100 = 255/237 FEC scaling (155 MHz or higher
input clock range required).
101 = 237/255 FEC scaling (155 MHz or higher
input clock range required).
110 = 66/64 FEC scaling (155 MHz or higher input
clock range required).
111 = 64/66 FEC scaling (155 MHz or higher input
clock range required).
Description