EC-1 datasheet(29/58 Pages) RENESAS

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R01DS0289EJ0100 Rev.1.00

Page 29 of 58

Sep 30, 2016

EC-1

2. Electrical Characteristics

2.4.1

Clock Timing

n = 0, 1

Note 1. When using the XTAL clock, ask the oscillator manufacturer to evaluate oscillation of the oscillator. For the oscillation

stabilization time, see the evaluation result provided by the oscillator manufacturer.

Note 2. When using the EtherCAT slave controller, make sure that the clock timing satisfies 25.00 MHz ± 25 ppm.

Table 2.11

CLKOUT25Mn Timing

Output load conditions: VOH = VCCQ33 – 0.5 V, VOL1 = 0.4 V, C = 30 pF

Item

Symbol

min

max

Unit

Test

Conditions

CLKOUT25Mn

(MII)

CLKOUT25Mn cycle time

Tck

―

Figure 2.2

CLKOUT25Mn frequency Typ. 25 MHz

――

25 + 50 ppm

MHz

CLKOUT25Mn duty ratio

―

CLKOUT25Mn output low pulse width

Tckl

Tck/2 – Tckf

Tck/2 + Tckf

CLKOUT25Mn output high pulse width

Tckh

Tck/2 – Tckr

Tck/2 + Tckr

CLKOUT25Mn rising/falling time

Tckr2/ckf

0.5

n = 0, 1

Figure 2.2

CLKOUT25Mn Pin Output Timing 2

Table 2.12

XTAL Clock Timing

Item

Symbol

min

typ

max

Unit

XTAL clock oscillator output cycle*1

tXTALcyc

40.00 + 50 ppm*2

Figure 2.3

XTAL Clock Oscillator Output Timing

tck

CLKOUT25Mn pin output

tckh

VOH

VOL1

1/2 × VCCQ33

VOL1

tckl

VOL1

tckr

tckf

1/2 × VCCQ33

tXTALcyc

1/2 × VCCQ33

XTAL clock oscillator output

1/2 × VCCQ33

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