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PDF FM25040B Data sheet ( Hoja de datos )
| Número de pieza | FM25040B | |
| Descripción | 4-Kbit (512 x 8) Serial (SPI) Automotive F-RAM | |
| Fabricantes | Cypress Semiconductor | |
| Logotipo |  |
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FM25040B
4-Kbit (512 × 8) Serial (SPI) Automotive
F-RAM
4-Kbit (512 × 8) Serial (SPI) Automotive F-RAM
Features
■ 4-Kbit ferroelectric random access memory (F-RAM) logically
organized as 512 × 8
❐ High-endurance 10 trillion (1013) read/writes
❐ 121-year data retention (See the Data Retention and
Endurance table)
❐ NoDelay™ writes
❐ Advanced high-reliability ferroelectric process
■ Very fast serial peripheral interface (SPI)
❐ Up to 14 MHz frequency
❐ Direct hardware replacement for serial flash and EEPROM
❐ Supports SPI mode 0 (0, 0) and mode 3 (1, 1)
■ Sophisticated write protection scheme
❐ Hardware protection using the Write Protect (WP) pin
❐ Software protection using Write Disable instruction
❐ Software block protection for 1/4, 1/2, or entire array
■ Low power consumption
❐ 300 A active current at 1 MHz
❐ 10 A (typ) standby current at +85 C
■ Voltage operation: VDD = 4.5 V to 5.5 V
■ Automotive-E temperature: –40 C to +125 C
■ 8-pin small outline integrated circuit (SOIC) package
■ AEC Q100 Grade 1 compliant
■ Restriction of hazardous substances (RoHS) compliant
Logic Block Diagram
Functional Description
The FM25040B is a 4-Kbit nonvolatile memory employing an
advanced ferroelectric process. A ferroelectric random access
memory or F-RAM is nonvolatile and performs reads and writes
similar to a RAM. It provides reliable data retention for 121 years
while eliminating the complexities, overhead, and system level
reliability problems caused by serial flash, EEPROM, and other
nonvolatile memories.
Unlike serial flash and EEPROM, the FM25040B performs write
operations at bus speed. No write delays are incurred. Data is
written to the memory array immediately after each byte is
successfully transferred to the device. The next bus cycle can
commence without the need for data polling. In addition, the
product offers substantial write endurance compared with other
nonvolatile memories. The FM25040B is capable of supporting
1013 read/write cycles, or 10 million times more write cycles than
EEPROM.
These capabilities make the FM25040B ideal for nonvolatile
memory applications requiring frequent or rapid writes.
Examples range from data collection, where the number of write
cycles may be critical, to demanding industrial controls where the
long write time of serial flash or EEPROM can cause data loss.
The FM25040B provides substantial benefits to users of serial
EEPROM or flash as a hardware drop-in replacement. The
FM25040B uses the high-speed SPI bus, which enhances the
high-speed write capability of F-RAM technology. The device
specifications are guaranteed over an automotive-e temperature
range of –40 C to +125 C.
For a complete list of related resources, click here.
WP
CS
HOLD
SCK
Instruction Decoder
Clock Generator
Control Logic
Write Protect
Instruction Register
512 x 8
F-RAM Array
Address Register
Counter
9
8
SI SO
Data I/O Register
2
Nonvolatile Status
Register
Errata: The Write Enable Latch (WEL) bit in the Status Register of FM25040B part doesn’t clear after executing the memory write (WRITE) operation at memory location(s)
from 0x100 to 0x1FF. For more information, see Errata on page 19. Details include errata trigger conditions, scope of impact, available workarounds, and silicon revision
applicability.
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 001-86151 Rev. *D
• San Jose, CA 95134-1709 • 408-943-2600
Revised August 9, 2016
1 page  
FM25040B
Data Transmission (SI/SO)
The SPI data bus consists of two lines, SI and SO, for serial data
communication. SI is also referred to as Master Out Slave In
(MOSI) and SO is referred to as Master In Slave Out (MISO). The
master issues instructions to the slave through the SI pin, while
the slave responds through the SO pin. Multiple slave devices
may share the SI and SO lines as described earlier.
The FM25040B has two separate pins for SI and SO, which can
be connected with the master as shown in Figure 2.
For a microcontroller that has no dedicated SPI bus, a
general-purpose port may be used. To reduce hardware
resources on the controller, it is possible to connect the two data
pins (SI, SO) together and tie off (HIGH) the HOLD and WP pins.
Figure 3 shows such a configuration, which uses only three pins.
Most Significant Bit (MSB)
The SPI protocol requires that the first bit to be transmitted is the
Most Significant Bit (MSB). This is valid for both address and
data transmission.
The 4-Kbit serial F-RAM requires an opcode including the upper
address bit, and a word address for any read or write operation.
The word address consist of the lower 8-address bits. The
complete address of 9 bits specifies each byte address uniquely.
Serial Opcode
After the slave device is selected with CS going LOW, the first
byte received is treated as the opcode for the intended operation.
FM25040B uses the standard opcodes for memory accesses.
Invalid Opcode
If an invalid opcode is received, the opcode is ignored and the
device ignores any additional serial data on the SI pin until the
next falling edge of CS, and the SO pin remains tristated.
Status Register
FM25040B has an 8-bit Status Register. The bits in the Status
Register are used to configure the device. These bits are
described in Table 3 on page 7.
Figure 2. System Configuration with SPI port
SCK
MOSI
MISO
SPI
Microcontroller
CS1
HOLD1
WP1
CS2
HOLD2
WP2
SCK SI SO
FM25040B
CS HOLD WP
SCK SI SO
FM25040B
CS HOLD WP
Figure 3. System Configuration without SPI port
P1.0
P1.1
Microcontroller
SCK SI SO
FM25040B
CS HOLD WP
P1.2
Document Number: 001-86151 Rev. *D
Page 5 of 22
5 Page 
FM25040B
Maximum Ratings
Exceeding maximum ratings may shorten the useful life of the
device. These user guidelines are not tested.
Storage temperature ................................ –55 C to +150 C
Maximum accumulated storage time
At 150 °C ambient temperature ................................. 1000 h
At 125 °C ambient temperature ................................11000 h
At 85 °C ambient temperature .............................. 121 Years
Ambient temperature
with power applied ................................... –55 °C to +125 °C
Supply voltage on VDD relative to VSS .........–1.0 V to +7.0 V
Input voltage ............. –1.0 V to +7.0 V and VIN < VDD+1.0 V
DC voltage applied to outputs
in High Z state .................................... –0.5 V to VDD + 0.5 V
Transient voltage (< 20 ns)
on any pin to ground potential ............ –2.0 V to VDD + 2.0 V
DC Electrical Characteristics
Package power dissipation capability (TA = 25 °C) ..... 1.0 W
Surface mount lead
soldering temperature (3 seconds) .......................... +260 C
DC output current (1 output at a time, 1s duration) .... 15 mA
Electrostatic Discharge Voltage
Human Body Model (AEC-Q100-002 Rev. E) ................ 3.5 kV
Charged Device Model (AEC-Q100-011 Rev. B) ........... 1.25 kV
Machine Model (AEC-Q100-003 Rev. E) .......................... 250 V
Latch up current ..................................................... > 140 mA
Operating Range
Range Ambient Temperature (TA)
VDD
Automotive-E
–40 C to +125 C
4.5 V to 5.5 V
Over the Operating Range
Parameter
Description
Test Conditions
Min
VDD Power supply
IDD VDD supply current
SCK toggling between fSCK = 1 MHz
VDD – 0.3 V
other inputs
and
VSS,
fSCK = 14 MHz
VSS or VDD – 0.3 V.
SO = Open.
4.5
–
–
ISB
ILI
ILO
VIH
VIL
VOH
VOL
VHYS[4]
VDD standby current
Input leakage current
Output leakage current
Input HIGH voltage
CS = VDD. All other TA = 85 °C
inputs VSS or VDD.
TA = 125 °C
VSS < VIN < VDD
VSS < VOUT < VDD
Input LOW voltage
Output HIGH voltage
IOH = –1 mA
Output LOW voltage
IOL = 2 mA
Input Hysteresis (CS and SCK pin)
–
–
–
–
0.75 × VDD
– 0.3
VDD – 0.8
–
0.05 × VDD
Typ [3]
5.0
–
–
–
–
–
–
–
–
–
–
–
Max Unit
5.5 V
0.3 mA
3 mA
10 A
30 A
±1 A
±1 A
VDD + 0.3
0.25 × VDD
–
V
V
V
0.4 V
–V
Notes
3. Typical values are at 25 °C, VDD = VDD(typ). Not 100% tested.
4. This parameter is characterized but not 100% tested.
Document Number: 001-86151 Rev. *D
Page 11 of 22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet FM25040B.PDF ] | |
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