T2080NXE8MQLB View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

T2080NXE8MQLB

T2080 QorIQ integrated multicore communications processor

NXP Semiconductors. 

Electrical characteristics

3.6.1.2 System clock AC timing specifications

This table provides the system clock (SYSCLK) AC timing specifications.

Table 13. SYSCLK AC timing specifications5

Parameter/condition

Symbol

SYSCLK frequency

SYSCLK cycle time

SYSCLK duty cycle

SYSCLK slew rate

fSYSCLK

tSYSCLK

tKHK / tSYSCLK

—

SYSCLK peak period jitter

—

SYSCLK jitter phase noise at -56 dBc —

AC Input Swing Limits at 1.8 V OVDD ΔVAC

Min

66

7.5

40

1

—

—

0.6 x OVDD

Typ

—

—

—

—

—

—

—

Max

133.3

15

60

4

± 150

500

1 x OVDD

Unit

MHz

ns

%

V/ns

ps

KHz

V

Notes

1, 2

1, 2

2

3

—

4

6

Notes:

1. Caution: The relevant clock ratio settings must be chosen such that the resulting SYSCLK frequency do not exceed their

respective maximum or minimum operating frequencies.

2. Measured at the rising edge and/or the falling edge at OVDD/2.

3. Slew rate as measured from 0.35 x OVDD to 0.65 x OVDD.

4. Phase noise is calculated as FFT of TIE jitter.

5. At recommended operating conditions with OVDD = 1.8V, see Table 3.

6. AC swing measured relative to half OVDD or VIH and VIL have equal absolute offset from OVDD/2, So, Swing = (VIH-VIL)/

OVDD and ΔVAC = Swing x OVDD.

3.6.2 Spread-spectrum sources

Spread-spectrum clock sources are an increasingly popular way to control

electromagnetic interference emissions (EMI) by spreading the emitted noise to a wider

spectrum and reducing the peak noise magnitude in order to meet industry and

government requirements. These clock sources intentionally add long-term jitter to

diffuse the EMI spectral content. The jitter specification given in this table considers

short-term (cycle-to-cycle) jitter only. The clock generator's cycle-to-cycle output jitter

should meet the chip's input cycle-to-cycle jitter requirement. Frequency modulation and

spread are separate concerns; the chip is compatible with spread-spectrum sources if the

recommendations listed in this table are observed.

Table 14. Spread-spectrum clock source recommendations1

Parameter

Frequency modulation

Frequency spread

Min

—

—

Max

60

1.0

Table continues on the next page...

Unit

kHz

%

Notes

—

2, 3

QorIQ T2080 Data Sheet, Rev. 3, 03/2018

58

NXP Semiconductors

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