SH7713 datasheet(824/904 Pages) RENESAS

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Section 24 Electrical Characteristics

Rev.1.50 Aug. 30, 2006 Page 784 of 860

REJ09B0288-0150

• Power-off order

1. In the reverse order of powering-on, first turn off the 1.5 V power, then turn off the 3.3 V

power within 1 ms. It is recommended that this interval will be as short as possible.

2. Pin states are undefined while only the 1.5 V power is off. The system design must ensure

that these undefined states do not cause erroneous system operation.

3. When the power is turned off, make sure that the voltage of the 1.5 V power is lower than

that of the 3.3 V power.

Waveforms and recommended times at power on/off are shown in Figure 24.1.

tpwu

VccQ: 3.3 V power

VccQ (min) voltage

VccQ (min)

attain time

Vcc (min)

attain time

Vcc: 1.5 V power

Vcc (min) voltage

Vcc/2 level voltage

Normal operation term

States undefined

term

Operation stopped

Clock oscillation started

Oscillation settling time (10 ms)

Cancel the power-on reset and

go to normal operation

tunc

GND

tpwd

Figure 24.1 Power On/Off Sequence

Recommended Power On/Off Times

Item

Symbol

Max. Permitted

Value

Unit

VccQ to Vcc power-on time interval

tpwu

VccQ to Vcc power-off time interval

tpwd

State undefined term

tunc

Note:

The recommended times shown above do not require strict settings.

The state undefined term indicates that pins are at the power rising stage. The pin state is

stabilized at VccQ (min.) attain time. However, a power-on reset (

RESETP) is accepted

successfully only after VccQ (min.) attain time and clock oscillation settling time. Set the

state undefined term less than 10 ms.

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