HD6417618 datasheet(573/646 Pages) RENESAS

573 / 646 page

Section 21 Electrical Characteristics

Rev. 6.00 Jun. 12, 2007 Page 541 of 610

REJ09B0131-0600

The time over which the internal state is undefined means the time taken to reach V

CC (min.).

The pin states become settled when V

CCQ reached the VCCQ (min.). The timing when a power-on

reset (

RES) is normally accepted is after V

CC reaches VCC (min.) and oscillation becomes stable

(when using the on-chip oscillator).

Ensure that the time over which the internal state is undefined is less than or equal to 100 ms.

• Power-off order

 In the reverse order of power-on, first turn off the 1.5-V system power, then turn off the

3.3-V system power within 10 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.

 Pin states are undefined while only the 1.5-V system power is turned off. The system

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

VccQ : 3.3-V system power

Vcc : 1.5-V system power

PWD

GND

Operation stopped

Normal operation period

Vcc/2

Table 21.3

Recommended Timing in Power-Off

Item

Symbol

Maximum Value

Unit

Time difference between turning off V

CCQ and VCC

PWD

Note:

The table shown above is recommended values, so they represent guidelines rather

than strict requirements.

HD6417618 Datasheet(PDF) 573 Page - Renesas Technology Corp