SI5347 Datasheet, PDF (51/59 Pages) Silicon Laboratories – DUAL/QUAD DSPLL ANY-FREQUENCY, ANY-OUTPUT JITTER ATTENUATORS

Si5347/46
Table 17. Si5347/46 Pin Descriptions¹ (Continued)
Pin
Name
Pin Number
Si5347A/B Si5347C/D Si5346
Pin
Type²
Function
Power
VDD
32
46
60
—
32
21
P Core Supply Voltage. The device core operates from a 1.8 V sup-
46
32
ply. See the Si5347/46 Family Reference Manual for power supply
filtering recommendations. A 0402 1 µF capacitor should be placed
60
39
very near each of these pins.
—
40
VDDA
13
13
8
P Core Supply Voltage 3.3 V. This core supply pin requires a 3.3 V
—
—
9
P ^{power source. See the Si5347/46 Family Reference Manual for}
power supply filtering recommendations. A 0402 1 µF capacitor
should be placed very near each of these pins.
VDDS
40
40
26
P Status Output Voltage. The voltage on this pin determines VOL/
VOH on the Si5346 LOL_A and LOL_B outputs. On the Si5347, this
pin determines VIL/VIH for the FDEC and OE1 inputs. Connect to
either 3.3 V or 1.8 V. A 0.1 µF bypass capacitor should be placed
very close to this pin.
VDDO0
22
VDDO1
29
VDDO2
33
VDDO3
36
VDDO4
43
VDDO5
49
22
18
P Output Clock Supply Voltage 0–7. Supply voltage (3.3 V, 2.5 V,
36
23
P ^{1.8 V) for OUTn, OUTn outputs. A 0.1 uF bypass capacitor should}
be placed very close to this pin. Leave VDDO pins of unused output
43
29
P _{drivers unconnected. An alternate option is to connect the VDDO}
49
34
P ^{pin to a power supply and disable the output driver to minimize cur-}
rent consumption. A 0402 1 µF capacitor should be placed very
—
—
P _{near each of these pins.}
—
—
P
VDDO6
52
—
—
P
VDDO7
57
—
—
P
GND PAD —
—
—
P Ground Pad. This pad provides connection to ground and must be
connected for proper operation. Use as many vias as practical and
keep the via length to an internal ground plan as short as possible.
Notes:
1. Refer to the Si5347/46 Family Reference Manual for more information on register setting names.
2. I = Input, O = Output, P = Power.
3. The IO_VDD_SEL control bit (0x0943 bit 0) selects 3.3 V or 1.8 V operation.
4. The voltage on the VDDS pin(s) determines 3.3 V or 1.8 V operation.
Rev. 1.1
51