SI5327 Datasheet, PDF (29/60 Pages) Silicon Laboratories – ANY-FREQUENCY PRECISION CLOCK MULTIPLIER/JITTER ATTENUATOR

Si5327
Register 19.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
VALTIME [1:0]
LOCKT [2:0]
Type
R
R
R
R/W
R/W
Reset value = 0010 1100
Bit
Name
Function
7:5
Reserved
4:3 VALTIME [1:0] VALTIME [1:0].
Sets amount of time for input clock to be valid before the associated alarm is removed.
00: 2 ms
01: 100 ms
10: 200 ms
11: 13 seconds
2:0 LOCKT [2:0] LOCKT [2:0].
Sets retrigger interval for one shot monitoring phase detector output. One shot is trig-
gered by phase slip in DSPLL. Refer to the Si53xx Family Reference Manual for more
details. To minimize lock time, the value 001 for LOCKT is recommended.
000: 106 ms
001: 53 ms
010: 26.5 ms
011: 13.3 ms
100: 6.6 ms
101: 3.3 ms
110: 1.66 ms
111: .833 ms
Rev. 1.0
29