SI5345_16 Datasheet, PDF (49/60 Pages) Silicon Laboratories – 10-Channel, Any-Frequency, Any-Output Jitter Attenuator/ Clock Multiplier

Pin Name
FINC
FDEC
IN_SEL0
IN_SEL1
RSVD
NC
Power
VDD
VDDA
VDDS
Si5345/44/42 Rev D Data Sheet
Pin Descriptions
Si5345
Pin Number
Si5344
Si5342
48
—
—
25
—
—
3
3
3
4
37
37
5
—
—
20
—
—
21
—
—
55
—
—
56
—
—
—
22
22
Pin Type¹
Function
Frequency Increment Pin²
I
This pin is used to step-up the output frequency of a selected out-
put. The affected output and its frequency change step size is
register configurable. This pin is internally pulled low and can be
left unconnected when not in use.
Frequency Decrement Pin²
I
This pin is used to step-down the output frequency of a selected
output. The affected output driver and its frequency change step
size is register configurable. This pin is internally pulled low and
can be left unconnected when not in use.
I
Input Reference Select²
The IN_SEL[1:0] pins are used in manual pin controlled mode to
I
select the active clock input as shown in Table 3.1 Manual Input
Selection Using IN_SEL[1:0] Pins on page 8. These pins are in-
ternally pulled low.
—
—
Reserved
—
These pins are connected to the die. Leave disconnected.
—
—
No Connect
These pins are not connected to the die. Leave disconnected.
32
21
21
46
32
32
60
39
39
—
40
40
13
8
8
—
9
9
—
26
26
—
—
29
—
—
34
P
Core Supply Voltage
P
The device operates from a 1.8 V supply. A 1.0 µF bypass capac-
P
itor should be placed very close to this pin. See the Si5345/44/42
Family Reference Manual for power supply filtering recommenda-
P
tions.
P
Core Supply Voltage 3.3 V
This core supply pin requires a 3.3 V power source. A 1 µF by-
P
pass capacitor should be placed very close to this pin. See the
Si5345/44/42 Family Reference Manual for power supply filtering
recommendations.
P
Status Output Voltage
P
The voltage on this pin determines VOL/VOH on the Si5342/44
LOL_A and LOL_B outputs. Connect to either 3.3 V or 1.8 V. A
P
1.0 µF bypass capacitor should be placed very close to this pin.
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