HD6417618 datasheet(572/646 Pages) RENESAS

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Section 21 Electrical Characteristics

Rev. 6.00 Jun. 12, 2007 Page 540 of 610

REJ09B0131-0600

21.2

Power-On and Power-Off Order

• Order of turning on 1.5-V system power (V

CC (main), VCC (sub), VCC (PLL1), and VCC (PLL2))

and 3.3-V system power (V

CCQ)

 First turn on the 3.3-V system power, then turn on the 1.5-V system power within 1 ms.

This time should be as short as possible. The system design must ensure that the states of

pins or undefined period of an internal state do not cause erroneous system operation.

 Until voltage is applied to all power supplies and a low level is input to the RES pin,

internal circuits remain unsettled, and so pin states are also undefined. The system design

must ensure that these undefined states do not cause erroneous system operation.

Waveforms at power-on are shown in the following figure.

VccQ (min.) power

Vcc (min.)

Vcc/2

VccQ : 3.3-V system power

Vcc : 1.5-V system power

PWU

UNC

GND

Pin states undefined

Normal operation period

Input low level in advance

Power-on reset state

Pin states undefined

RES

Other pins *

Note: * Except power/GND and clock related pins

Table 21.2

Recommended Timing at Power-On

Item

Symbol

Maximum Value

Unit

Time difference between turning on V

CCQ and VCC

PWU

Time over which the internal state is undefined

UNC

100

Note:

The values shown in table 21.2 are recommended values, so they represent guidelines

rather than strict requirements.

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