Compact Flash 4 series

AP-CFxxxxA5XS-XXXXXX

13

© 2009 Apacer Technology Inc.

Rev. 1.1

7.6 Power Supply Sequence

The controller is an IC that functions at 3.3V for the I/O power supply. There power supplies will deliver

power to the chip externally, but a through current may occur inside the chip depending on the power-on

and power-off sequence. For this reason, the power supply should be turned on and off simultaneously

for reliability. Refer to figure 7-1.



Turn on condition

Time difference of VDDIO*0 to both VDDIO*0.9 is less than 100[ms].



Turn off condition

Time difference of VDDIO*0.9 to both VDDIO*0.1 is less than 100[ms].



5V tolerant buffer

Before/after power supply is turned on/off, it must not apply 5V voltage.

Figure 7-1 Power ON/OFF Sequence

7.7 Setup Time

Hardware reset time (reset release to a ready state) is less than about 100 [ms] in PC Card/HOST

Memory Bus mode. For IDE mode, it is less than about 450 [ms] when master connection, and is less

than about 250 [ms] when slave connection. Setup time does not depend on the total capacity of

connected flash memory.