SH7205 Datasheet, PDF (1784/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 33 Electrical Characteristics
33.2 Power-on/Power-off Sequence
3.3 V power supply
3.3 V power supply Min. voltage (3.0 V)
1.2 V power supply
1.2 V power supply Min. voltage (1.1 V)
GND
t_unc
Pin status
undefined
Normal operation period
t_unc
Pin status
undefined
Figure 33.1 Power-on/Power-off Sequence
Table 33.2 Time for Power-on/Power-off Sequence
Item
Symbol
Min.
Max.
Unit
State undefined time
t
unc

100
ms
Note: It is recommended that the 1.2-V power supply (V_CC, PLLV_CC, USBAV_CC, and USBDV_CC) and
the 3.3-V power supply (PV_CC, AV_CC, USBAPV_CC, 2DGAPV_CC0, and 2DGAPV_CC1) are turned
on and off nearly simultaneously.
An indefinite period of time appears, from the time that power is turned on to the time that
both of the 1.2-V power supply and the 3.3-V power supply rise to the Min. voltage (1.1 V
for 1.2-V power supply and 3.0 V for 3.3-V power supply), or from the time that either of the
1.2-V power supply or the 3.3-V power supply is turned off and passes the Min. voltage (1.1
V for 1.2-V power supply and 3.0 V for 3.3-V power supply) to the time that both of the 1.2-
V power supply and the 3.3-V power supply fall to GND.
During these periods, states of output pins and in-out pins and internal states become
undefined. So it should be as short as possible. Also design the system so that these
undefined states do not cause an overall malfunction.
Rev. 1.00 Mar. 25, 2008 Page 1752 of 1868
REJ09B0372-0100