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S34ML01G1 Datasheet(数据表) 32 Page - Cypress Semiconductor

部件型号  S34ML01G1
说明  1 Gb/2 Gb/4 Gb, 3 V, SLC NAND Flash for Embedded
下载  71 Pages
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制造商  CYPRESS [Cypress Semiconductor]
网页  http://www.cypress.com
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S34ML01G1 Datasheet(HTML) 32 Page - Cypress Semiconductor

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Document Number: 002-00676 Rev. *V
Page 32 of 71
S34ML01G1
S34ML02G1
S34ML04G1
4. Signal Descriptions
4.1
Data Protection and Power On / Off Sequence
The device is designed to offer protection from any involuntary program/erase during power-transitions. An internal voltage detector
disables all functions whenever VCC is below about 1.8V.
The power-up and power-down sequence is shown in Figure 46 on page 55.
The Ready/Busy signal shall be valid within 100 µs after the power supplies have reached the minimum values (as specified on),
and shall return to one within 5 ms (max).
During this busy time, the device executes the initialization process (cam reading), and dissipates a current ICC0 (30 mA max), in
addition, it disregards all commands excluding Read Status Register (70h).
At the end of this busy time, the device defaults into “read setup”, thus if the user decides to issue a page read command, the 00h
command may be skipped.
The WP# pin provides hardware protection and is recommended to be kept at VIL during power-up and power-down. A recovery time
of minimum 100 µs is required before the internal circuit gets ready for any command sequences as shown in Figure 46 on page 55.
The two-step command sequence for
program/erase provides additional software protection.
4.2
Ready/Busy
The Ready/Busy output provides a method of indicating the completion of a page program, erase, copyback, or read completion.
The R/B# pin is normally high and goes to low when the device is busy (after a reset, read, program, or erase operation). It returns to
high when the internal controller has finished the operation. The pin is an open-drain driver thereby allowing two or more R/B#
outputs to be Or-tied. Because the pull-up resistor value is related to tr (R/B#) and the current drain during busy (ibusy), and output
load capacitance is related to tf an appropriate value can be obtained with the reference chart shown in Figure 10.
For example, for a particular system with 20 pF of output load, tf from VCC to VOL at 10% to 90% will be 10 ns, whereas for a
particular load of 50 pF, Cypress measured it to be 20 ns as shown in Figure 10.




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