PDF FM25L04B Data sheet ( Hoja de datos )

Número de pieza	FM25L04B
Descripción	3V F-RAM Memory
Fabricantes	Ramtron
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No Preview Available ! www.DataSheet.co.kr Preliminary FM25L04B 4Kb Serial 3V F-RAM Memory Features 4K bit Ferroelectric Nonvolatile RAM • Organized as 512 x 8 bits • High Endurance 100 Trillion (1014) Read/Writes • 38 Year Data Retention (@ +75ºC) • NoDelay™ Writes • Advanced High-Reliability Ferroelectric Process Very Fast Serial Peripheral Interface - SPI • Up to 20 MHz Frequency • Direct Hardware Replacement for EEPROM • SPI Mode 0 & 3 (CPOL, CPHA=0,0 & 1,1) Sophisticated Write Protection Scheme • Hardware Protection • Software Protection Low Power Consumption • Low Voltage Operation 2.7-3.6V • 200 µA Active Current (1 MHz) • 3 µA (typ.) Standby Current Industry Standard Configuration • Industrial Temperature -40°C to +85°C • 8-pin “Green”/RoHS SOIC and TDFN Packages Description The FM25L04B is a 4-kilobit nonvolatile memory employing an advanced ferroelectric process. A ferroelectric random access memory or F-RAM is nonvolatile and performs reads and writes like a RAM. It provides reliable data retention for 38 years while eliminating the complexities, overhead, and system level reliability problems caused by EEPROM and other nonvolatile memories. The FM25L04B performs write operations at bus speed. No write delays are incurred. Data is written to the memory array immediately after each byte has been transferred to the device. The next bus cycle may commence without the need for data polling. The FM25L04B is capable of supporting 1014 read/write cycles, or a million times more write cycles than EEPROM. These capabilities make the FM25L04B ideal for nonvolatile memory applications requiring frequent or rapid writes or low power operation. Examples range from data collection, where the number of write cycles may be critical, to demanding industrial controls where the long write time of EEPROM can cause data loss. The FM25L04B provides substantial benefits to users of serial EEPROM as a hardware drop-in replacement. The FM25L04B uses the high-speed SPI bus, which enhances the high-speed write capability of F-RAM technology. Device specifications are guaranteed over an industrial temperature range of -40°C to +85°C. This is a product that has fixed target specifications but are subject to change pending characterization results. Rev. 1.3 Feb. 2011 Pin Configuration CS SO WP VSS 1 2 3 4 8 VDD 7 HOLD 6 SCK 5 SI Top View /CS 1 SO 2 /WP 3 VSS 4 8 VDD 7 /HOLD 6 SCK 5 SI Pin Name /CS /WP /HOLD SCK SI SO VDD VSS Function Chip Select Write Protect Hold Serial Clock Serial Data Input Serial Data Output Supply Voltage Ground Ordering Information FM25L04B-G “Green”/RoHS 8-pin SOIC FM25L04B-GTR “Green”/RoHS 8-pin SOIC, Tape & Reel FM25L04B-DG “Green”/RoHS 8-pin TDFN FM25L04B-DGTR “Green”/RoHS 8-pin TDFN, Tape & Reel Ramtron International Corporation 1850 Ramtron Drive, Colorado Springs, CO 80921 (800) 545-F-RAM, (719) 481-7000 www.ramtron.com Page 1 of 14 Datasheet pdf - http://www.DataSheet4U.net/ 1 page www.DataSheet.co.kr Data Transfer All data transfers to and from the FM25L04B occur in 8-bit groups. They are synchronized to the clock signal (SCK), and they transfer most significant bit (MSB) first. Serial inputs are registered on the rising edge of SCK. Outputs are driven from the falling edge of SCK. Command Structure There are six commands called op-codes that can be issued by the bus master to the FM25L04B. They are listed in the table below. These op-codes control the functions performed by the memory. They can be divided into three categories. First, there are commands that have no subsequent operations. They perform a single function such as to enable a write operation. Second are commands followed by one byte, either in or out. They operate on the status register. The third group includes commands for memory transactions followed by address and one or more bytes of data. Table 1. Op-code Commands Name Description WREN Set Write Enable Latch WRDI RDSR WRSR READ Write Disable Read Status Register Write Status Register Read Memory Data WRITE Write Memory Data Op-code 0000 0110b 0000 0100b 0000 0101b 0000 0001b 0000 A011b 0000 A010b FM25L04B - 4Kb 3V SPI F-RAM WREN - Set Write Enable Latch The FM25L04B will power up with writes disabled. The WREN command must be issued prior to any write operation. Sending the WREN op-code will allow the user to issue subsequent op-codes for write operations. These include writing the status register and writing the memory. Sending the WREN op-code causes the internal Write Enable Latch to be set. A flag bit in the status register, called WEL, indicates the state of the latch. WEL=1 indicates that writes are permitted. Attempting to write the WEL bit in the status register has no effect. Completing any write operation will automatically clear the write-enable latch and prevent further writes without another WREN command. Figure 5 below illustrates the WREN command bus configuration. WRDI - Write Disable The WRDI command disables all write activity by clearing the Write Enable Latch. The user can verify that writes are disabled by reading the WEL bit in the status register and verifying that WEL=0. Figure 6 illustrates the WRDI command bus configuration. CS SCK 01 2 3 4 5 6 7 SI 0 0 0 0 0 1 1 0 SO Hi-Z Figure 5. WREN Bus Configuration CS SCK 01 2 3 4 5 6 7 Rev. 1.3 Feb. 2011 SI SO 00 00 0 10 Hi-Z Figure 6. WRDI Bus Configuration 0 Page 5 of 14 Datasheet pdf - http://www.DataSheet4U.net/ 5 Page www.DataSheet.co.kr FM25L04B - 4Kb 3V SPI F-RAM Serial Data Bus Timing CS SCK SI SO tCSU 1/tCK tH tSU tF tODV tR tOH tCL tCH tD tCSH tOD /Hold Timing CS SCK HOLD SO Power Cycle Timing tHS tHH tHS tHH tHZ tLZ Power Cycle Timing (TA = -40° C to + 85° C, VDD = 2.7V to 3.6V unless otherwise specified) Symbol Parameter Min Max Units tPU VDD(min) to First Access Start tPD Last Access Complete to VDD(min) tVR VDD Rise Time tVF VDD Fall Time 10 - ms 0 - µs 30 - µs/V 100 - µs/V Notes 1. Slope measured at any point on VDD waveform. Notes 1 1 Rev. 1.3 Feb. 2011 Page 11 of 14 Datasheet pdf - http://www.DataSheet4U.net/ 11 Page

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