SI5348 Datasheet, PDF (31/54 Pages) Silicon Laboratories – Network Synchronizer for SyncE/ 1588 PTP Telecom Boundary (T-BC) and Slave (T-SC) Clocks

Si5348 Rev D Data Sheet
Electrical Specifications
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Note:
1. Driver strength is a register programmable setting and stored in NVM. Options are OUTx_CMOS_DRV = 1, 2, 3. Refer to the
Si5348 Reference Manual for more details on register settings.
2. I_OL/I_OH is measured at V_OL/V_OH as shown in the dc test configuration.
DC Test Configuration
Zs
VOL/VOH
IOL/IOH
3. A 5 pF capacitive load is assumed. The LVCMOS outputs were set to OUTx_CMOS_DRV = 3, at 156.25 MHz.
Differential Output Test Configuration
IDDO
OUT
OUTb
0.1 uF
50
100
50
0.1 uF
IDDO
OUT
OUTb
LVCMOS Output Test Configuration
Trace length 5
inches
50
499 Ω
0.1 uF
4.7 pF
56 Ω
50 Ω Scope Input
50
499 Ω
0.1 uF
50 Ω Scope Input
4.7 pF
56 Ω
Table 5.7. Output Status Pin Specifications
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Si5348 Status Output Pins ( LOL_Cb, LOL_Db, INTRb, LOS1b, LOS2b, SDA/SDIO², A1/SDO)
Output Voltage
V_OH
I_OH = –2 mA
V_DDIO1 ×
—
—
V
0.85
V_OL
I_OL = 2 mA
—
—
V_DDIO1 ×
V
0.15
Si5348 Status Output Pins (LOL_Ab, LOS0b)
Output Voltage
V_OH
I_OH = –2 mA
V_DDS × 0.85
—
—
V
V_OL
I_OL = 2 mA
—
—
V_DDS × 0.15
V
Note:
1. V_DDIO is determined by the IO_VDD_SEL bit. It is selectable as V_DDA or V_DD. Users normally select this option in the ClockBuild-
er Pro GUI. Alternatively, refer to the Si5348 Reference Manual for more details on register settings.
2. The V_OH specification does not apply to the open-drain SDA/SDIO output when the serial interface is in I²C mode or is unused
with I2C_SEL pulled high. V_OL remains valid in all cases.
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