EN25P05
Figure 13. Bulk Erase Instruction Sequence Diagram
Deep Power-down (DP) (B9h)
Executing the Deep Power-down (DP) instruction is the only way to put the device in the lowest con-
sumption mode (the Deep Power-down mode). It can also be used as an extra software protection
mechanism, while the device is not in active use, since in this mode, the device ignores all Write,
Program and Erase instructions.
Driving Chip Select (CS#) High deselects the device, and puts the device in the Standby mode (if
there is no internal cycle currently in progress). But this mode is not the Deep Power-down mode.
The Deep Power-down mode can only be entered by executing the Deep Power-down (DP)
instruction, to reduce the standby current (from ICC1 to ICC2, as specified in Table 8.).
Once the device has entered the Deep Power-down mode, all instructions are ignored except the
Release from Deep Power-down and Read Device ID (RDI) instruction. This releases the device
from this mode. The Release from Deep Power-down and Read Device ID (RDI) instruction also
allows the Device ID of the device to be output on Serial Data Output (DO).
The Deep Power-down mode automatically stops at Power-down, and the device always Powers-up
in the Standby mode. The Deep Power-down (DP) instruction is entered by driving Chip Select (CS#)
Low, followed by the instruction code on Serial Data Input (DI). Chip Select (CS#) must be driven
Low for the entire duration of the sequence.
The instruction sequence is shown in Figure 14..Chip Select (CS#) must be driven High after the
eighth bit of the instruction code has been latched in, otherwise the Deep Power-down (DP)
instruction is not executed. As soon as Chip Select (CS#) is driven High, it requires a delay of t
DP
before the supply current is reduced to ICC2 and the Deep Power-down mode is entered.
Any Deep Power-down (DP) instruction, while an Erase, Program or Write cycle is in progress, is
rejected without having any effects on the cycle that is in progress.
Figure 14. Deep Power-down Instruction Sequence Diagram
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc., www.essi.com.tw
16
Rev. C, Issue Date: 2008/01/17
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
