SH7263 Datasheet, PDF (1716/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 35 Electrical Characteristics
35.2 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 35.1 Power-on/Power-off Sequence
Table 35.2 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 , PLLV , USBAV , and USBDV ) and
CC
CC
CC
CC
the 3.3-V power supply (PV_CC, AV_CC, USBAPV_CC, USBDPV_CC) 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. 2.00 Mar. 14, 2008 Page 1682 of 1824
REJ09B0290-0200