HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 959

• Manufacturer Part Number: HD6417641
• Manufacturer: RENESAS [Renesas Technology Corp]

Table 25.2 Recommended Values for Power-On/Off Sequence
Notes: 1. The figures shown above are recommended values, so they represent guidelines rather
Item
Time lag between VccQ and Vcc when turning on tpwu
Time lag between VccQ and Vcc when turning off tpwd
Unsettling operation time
2. The system design must, however, ensure that the undefined states of internal circuits
3. The negative values in the maximum permissible value column indicate the allowed
4. When Vcc (1.8-V power) rises more quickly than VccQ (3.3-V power), the figure in the
5. The time over which the internal state is undefined means time over which the first
6. The pin states become defined when VccQ (min.) is reached. The power-on reset
7. Ensure that the period over which the internal state is undefined is less than or equal to
than strict requirements.
and pin states do not cause erroneous system operation.
difference in the time the voltages supplied as VccQ and Vcc take to rise. Therefore,
these figures do not allow the power supply in the reverse sequence: Vcc then VccQ.
maximum permissible value column is a negative value.
supplying of power is in a transient state.
(RESETP) is accepted after Vcc reaches Vcc (min.) and after the clock oscillation
settling time elapsed.
100 ms.
Symbol
tunc
Rev. 4.00 Sep. 14, 2005 Page 909 of 982
Max. Permissible Value Unit
1
1
100
Section 25 Electrical Characteristics
REJ09B0023-0400
ms
ms
ms