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©2021 Renesas Electronics Corporation

R31DS0073EU0200 July 30, 2021

831742I Datasheet

AC Electrical Characteristics

Table 5A. PCI e Refclk Phase Jitter[1][2][3], VDD = 3.3V ± 0.3V, TA = -40°C to 85°C

1.

The Refclk jitter is measured after applying the filter functions found in PCI Express Base Specification 4.0, Revision 1.0. See the Test

Loads section of the data sheet for the exact measurement setup. The worst case results for each data rate are summarized in this table.

Equipment noise is removed from all measurements.

2.

Jitter measurements shall be made with a capture of at least 100,000 clock cycles captured by a real-time oscilloscope (RTO) with a

sample rate of 20 GS/s or greater. Broadband oscilloscope noise must be minimized in the measurement. The measured PP jitter is used

(no extrapolation) for RTO measurements. Alternately - Jitter measurements may be used with a Phase Noise Analyzer (PNA) extending

(flat) and integrating and folding the frequency content up to an offset from the carrier frequency of at least 200 MHz (at 300 MHz absolute

frequency) below the Nyquist frequency. For PNA measurements for the 2.5 GT/s data rate, the RMS jitter is converted to peak-to-peak

jitter using a multiplication factor of 8.83.

3.

SSC spurs from the fundamental and harmonics are removed up to a cutoff frequency of 2 MHz taking care to minimize removal of any

non-SSC content.

4.

Note that 0.7 ps RMS is to be used in channel simulations to account for additional noise in a real system.

5.

The rms sum of the source jitter and the additive jitter (arithmetic sum for PCIe Gen1) must be less than the jitter specification listed.

Symbol

Parameter

Test Conditions

Minimum

Typical Maximum

Specification

Limit

Units

tjphPCIeG1-CC

Additive PCIe

Phase Jitter

(Common Clocked

Architecture)

PCIe Gen 1 (2.5 GT/s)

3.3

5

86 [5]

ps pk-pk

tjphPCIeG2-CC

PCIe Gen 2 Lo Band (5.0 GT/s)

54

61

3000 [5]

fs (RMS)

PCIe Gen 2 Hi Band (5.0 GT/s)

228

255

3100 [5]

tjphPCIeG3-CC

PCIe Gen 3 (8.0 GT/s)

116

130

1000 [5]

tjphPCIeG4-CC

PCIe Gen 4 (16.0 GT/s) [3] [4]

116

130

500 [5]