si5315 Silicon Laboratories, si5315 Datasheet - Page 49

• Manufacturer Part Number: si5315
• Description: Synchronous Ethernet/telecom Jitter Attenuating Clock Multiplier
• Manufacturer: Silicon Laboratories

Pin #
14
16
17
18
21
23
22
Pin Name
DBL2_BY
BWSEL1
BWSEL0
CKIN1+
CKIN1–
CS_CA
LOL
Table 18. Si5315 Pin Descriptions (Continued)
I/O
I/O
O
I
I
I
Signal Level
LVCMOS
LVCMOS
3-Level
3-Level
Multi
Preliminary Rev. 0.2
Output 2 Disable/Bypass Mode Control.
Controls enable of CKOUT2 divider/output buffer path and
PLL bypass mode.
L = CKOUT2 enabled
M = CKOUT2 disabled
H = Bypass mode with CKOUT2 enabled
This pin has a weak pull-up and weak pull-down and defaults
to M.
Some designs may require an external resistor voltage
divider when driven by an active device that will tri-state.
Clock Input 1.
Differential input clock. This input can also be driven with a
single-ended signal. Input frequency selected from a table of
values. The same frequency must be applied to CKIN1 and
CKIN2.
PLL Loss of Lock Indicator.
This pin functions as the active high PLL loss of lock indica-
tor.
0 = PLL locked
1 = PLL unlocked
Input Clock Select/Active Clock Indicator.
Input:
Output: If automatic clock selection mode is chosen
Loop Bandwidth Select.
Three level inputs that select the DSPLL closed loop band-
width. See Table 7 on page 21 for available settings.
These pins have both weak pull-ups and weak pull-downs
and default to M.
Some designs may require an external resistor voltage
divider when driven by an active device that will tri-state.
(AUTOSEL = L), this pin functions as the manual
input clock selector. This input is internally deglitched
to prevent inadvertent clock switching during
changes in the CS input state.
0 = Select CKIN1
1 = Select CKIN2
If configured as input, must be set high or low.
(AUTOSEL = M or H), this pin indicates which of the
two input clocks is currently the active clock. If
alarms exist on both CKIN1 and CKIN2, indicating
that the holdover state has been entered, CA will
indicate the last active clock that was used before
entering the hold state.
0 = CKIN1 active input clock
1 = CKIN2 active input clock
If manual clock selection mode is chosen
Description
Si5315
49