DS0147 datasheet(76/128 Pages) MICROCHIP

76 / 128 page

Unit

–1 Max

–1 Typ

–1 Min

STD Max

STD Typ

STD Min

Symbol

Parameter

KHz

TxREF CLKP-

FD/ (128*6

TxREF CLKP-

FD/ (128)

TxREF CLKP-

FD/ (128*6

TxREF CLKP-

FD/ (128)

Mod_Freq

Spread

spectrum

modulation

frequency

1. See the maximum reference clock rate allowed per input buffer standard.

2. The minimum value applies to this clock when used as an XCVR reference clock. It does not apply when

used as a non-XCVR input buffer (DC input allowed).

3. Cascaded reference clock.

4. After reference clock input divider.

5. To calculate the FTXREFPN phase noise requirement at frequencies other than 156 MHz use the following

formula: FTXREFPN at f(MHz) = FTXREFPN at 156 MHz + 20*log(f/156)

6. Programmable capability for depth of down-spread or center-spread modulation.

7. Programmable modulation rate based on the modulation divider setting (1 to 63).

6.5.3

Transceiver Reference Clock I/O Standards

The following differential I/O standards are supported as transceiver reference clocks.

• LVDS25/33

• HCLS25 (for PCIe)

• RSDS25/33

• MINILVDS25/33

• SUBLVDS25/33

• PPDS25/33

• SLVS25/33

• BUSLVDS25

• MLVDS25

• LVPECL33

• MIPI25

For DC input levels, see table Differential DC Input and Output Levels.

Note: The transceiver reference clock differential receiver supports VICM common mode.

Note: The amount of jitter from the input receiver increases at common modes of less 0.2 V or greater than

VDDSREF–0.4 V. Therefore, for improved SerDes operation, it is recommended that the VCM of the signal

into the SerDes reference clock input be at a minimum of 0.2 V and below VDDSREF–0.4 V.

The following single-ended I/O standards are supported as transceiver reference clocks.

• LVTTL

• LVCMOS33

• LVCMOS25

• LVCMOS18

• SSTL25I/II

• SSTL18I/II

• HSUL18I/II

Microsemi Proprietary and Confidential. DS0147 Revision 1.0

AC Switching Characteristics

DS0147 Datasheet(PDF) 76 Page - Microchip Technology

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