Electronic Components Datasheet Search |
|
SST39L800A-70-4I-C1KE Datasheet(PDF) 7 Page - Microchip Technology |
|
SST39L800A-70-4I-C1KE Datasheet(HTML) 7 Page - Microchip Technology |
7 / 37 page © 2011 Silicon Storage Technology, Inc. DS25001A 03/11 7 2 Mbit / 4 Mbit / 8 Mbit Multi-Purpose Flash SST39LF200A / SST39LF400A / SST39LF800A SST39VF200A / SST39VF400A / SST39VF800A Data Sheet A Microchip Technology Company Device Operation Commands are used to initiate the memory operation functions of the device. Commands are written to the device using standard microprocessor write sequences. A command is written by asserting WE# low while keeping CE# low. The address bus is latched on the falling edge of WE# or CE#, whichever occurs last. The data bus is latched on the rising edge of WE# or CE#, whichever occurs first. Read The Read operation of the SST39LF200A/400A/800A and SST39VF200A/400A/800A is controlled by CE# and OE#, both have to be low for the system to obtain data from the outputs. CE# is used for device selection. When CE# is high, the chip is deselected and only standby power is consumed. OE# is the output control and is used to gate data from the output pins. The data bus is in high impedance state when either CE# or OE# is high. Refer to the Read cycle timing diagram for further details (Figure 5). Word-Program Operation The SST39LF200A/400A/800A and SST39VF200A/400A/800A are programmed on a word-by-word basis. Before programming, the sector where the word exists must be fully erased. The Program oper- ation is accomplished in three steps. The first step is the three-byte load sequence for Software Data Protection. The second step is to load word address and word data. During the Word-Program opera- tion, the addresses are latched on the falling edge of either CE# or WE#, whichever occurs last. The data is latched on the rising edge of either CE# or WE#, whichever occurs first. The third step is the internal Program operation which is initiated after the rising edge of the fourth WE# or CE#, whichever occurs first. The Program operation, once initiated, will be completed within 20 µs. See Figures 6 and 7 for WE# and CE# controlled Program operation timing diagrams and Figure 18 for flowcharts. During the Program operation, the only valid reads are Data# Polling and Toggle Bit. During the internal Pro- gram operation, the host is free to perform additional tasks. Any commands issued during the internal Program operation are ignored. Sector/Block-Erase Operation The Sector- (or Block-) Erase operation allows the system to erase the device on a sector-by-sector (or block-by-block) basis. The SST39LF200A/400A/800A and SST39VF200A/400A/800A offers both Sec- tor-Erase and Block-Erase mode. The sector architecture is based on uniform sector size of 2 KWord. The Block-Erase mode is based on uniform block size of 32 KWord. The Sector-Erase operation is ini- tiated by executing a six-byte command sequence with Sector-Erase command (30H) and sector address (SA) in the last bus cycle. The Block-Erase operation is initiated by executing a six-byte com- mand sequence with Block-Erase command (50H) and block address (BA) in the last bus cycle. The sector or block address is latched on the falling edge of the sixth WE# pulse, while the command (30H or 50H) is latched on the rising edge of the sixth WE# pulse. The internal Erase operation begins after the sixth WE# pulse. The End-of-Erase operation can be determined using either Data# Polling or Tog- gle Bit methods. See Figures 11 and 12 for timing waveforms. Any commands issued during the Sec- tor- or Block-Erase operation are ignored. Chip-Erase Operation The SST39LF200A/400A/800A and SST39VF200A/400A/800A provide a Chip-Erase operation, which allows the user to erase the entire memory array to the “1” state. This is useful when the entire device must be quickly erased. |
Similar Part No. - SST39L800A-70-4I-C1KE |
|
Similar Description - SST39L800A-70-4I-C1KE |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |