4Mb EXCELON™ LP Ferroelectric RAM (F-RAM)
Serial (SPI), 512K × 8, inrush current control, industrial
Table of contents
Table of contents
Features ...........................................................................................................................................1
Functional description.......................................................................................................................2
Logic block diagram ..........................................................................................................................2
Table of contents...............................................................................................................................3
Pinout ..............................................................................................................................................4
Pin definitions ..................................................................................................................................5
Functional overview..........................................................................................................................6
Memory architecture ....................................................................................................................................................6
SPI bus...........................................................................................................................................................................6
SPI overview..................................................................................................................................................................6
Terms used in SPI protocol ..........................................................................................................................................7
SPI master .....................................................................................................................................................................7
SPI slave ........................................................................................................................................................................7
Chip select (CS) .............................................................................................................................................................7
Serial clock (SCK)..........................................................................................................................................................7
Data transmission (SI/SO) ............................................................................................................................................8
Most significant bit (MSb).............................................................................................................................................8
Serial opcode ................................................................................................................................................................8
Invalid opcode ..............................................................................................................................................................9
Status register...............................................................................................................................................................9
SPI modes .....................................................................................................................................................................9
Power-up to first access ...............................................................................................................................................9
Functional description.....................................................................................................................10
Command structure ...................................................................................................................................................10
Write enable control commands ...............................................................................................................................11
Register access commands........................................................................................................................................12
Memory operation ......................................................................................................................................................13
Memory write operation commands .........................................................................................................................14
Memory read commands ...........................................................................................................................................14
Special sector memory access commands ...............................................................................................................16
Identification and serial number commands............................................................................................................17
Low power mode commands.....................................................................................................................................19
Maximum ratings ............................................................................................................................21
Operating range..............................................................................................................................22
DC electrical characteristics .............................................................................................................23
Data retention and endurance..........................................................................................................26
Capacitance....................................................................................................................................27
Thermal resistance..........................................................................................................................28
AC test conditions ...........................................................................................................................29
AC switching characteristics.............................................................................................................30
Power cycle timing ..........................................................................................................................32
Ordering information ......................................................................................................................33
Ordering code definitions ..........................................................................................................................................33
Package diagrams ...........................................................................................................................34
Acronyms .......................................................................................................................................36
Document conventions ....................................................................................................................37
Units of measure.........................................................................................................................................................37
Revision history ..............................................................................................................................38
Datasheet
3
002-18671 Rev. *O
2023-06-02
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