|
|
Número de pieza | FM25CL64 | |
Descripción | 64Kb FRAM Serial 3V Memory | |
Fabricantes | ETC | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de FM25CL64 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
No Preview Available ! FM25CL64
64Kb FRAM Serial 3V Memory
Features
64K bit Ferroelectric Nonvolatile RAM
• Organized as 8,192 x 8 bits
• Unlimited Read/Write Cycles
• 45 Year Data Retention
• 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)
Description
The FM25CL64 is a 64-kilobit nonvolatile memory
employing an advanced ferroelectric process. A
ferroelectric random access memory or FRAM is
nonvolatile and performs reads and writes like a
RAM. It provides reliable data retention for 45 years
while eliminating the complexities, overhead, and
system level reliability problems caused by
EEPROM and other nonvolatile memories.
Unlike serial EEPROMs, the FM25CL64 performs
write operations at bus speed. No write delays are
incurred. The next bus cycle may commence
immediately without the need for data polling. The
next bus cycle may start immediately. In addition, the
product offers virtually unlimited write endurance,
orders of magnitude more endurance than EEPROM.
Also, FRAM exhibits much lower power during
writes than EEPROM since write operations do not
require an internally elevated power supply voltage
for write circuits.
These capabilities make the FM25CL64 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 EEPROM can cause data loss.
The FM25CL64 provides substantial benefits to users
of serial EEPROM as a hardware drop-in
replacement. The FM25CL64 uses the high-speed
SPI bus, which enhances the high-speed write
capability of FRAM technology. Device
specifications are guaranteed over an industrial
temperature range of -40°C to +85°C.
This product conforms to specifications per the terms of the Ramtron
standard warranty. The product has completed Ramtron’s internal
qualification testing and has reached production status.
Rev. 3.2
July 2005
Sophisticated Write Protection Scheme
• Hardware Protection
• Software Protection
Low Power Consumption
• Low Voltage Operation 2.7-3.65V
• 1 µA Standby Current
Industry Standard Configuration
• Industrial Temperature -40°C to +85°C
• 8-pin SOIC and 8-pin TDFN Packages
• “Green” Packaging Options
Pin Configuration
CS
SO
WP
VSS
1
2
3
4
8 VDD
7 HOLD
6 SCK
5 SI
/CS 1
SO 2
/WP 3
VSS 4
8 VDD
7 /HOLD
6 SCK
5 SI
Top View
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
FM25CL64-S 8-pin SOIC
FM25CL64-G “Green” 8-pin SOIC
FM25CL64-DG “Green” 8-pin TDFN
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
www.ramtron.com
Page 1 of 14
1 page Data Transfer
All data transfers to and from the FM25CL64 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 FM25CL64. 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 Write Disable
RDSR Read Status Register
WRSR Write Status Register
READ Read Memory Data
WRITE Write Memory Data
Op-code
0000 0110b
0000 0100b
0000 0101b
0000 0001b
0000 0011b
0000 0010b
FM25CL64
WREN - Set Write Enable Latch
The FM25CL64 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.
Figure 5. WREN Bus Configuration
Rev. 3.2
July 2005
Figure 6. WRDI Bus Configuration
Page 5 of 14
5 Page Serial Data Bus Timing
tCSU
1/fCK
tH
tSU
tF tR
tODV
tOH
FM25CL64
tCL tCH
tD
tCSH
tOD
/Hold Timing
Data Retention (VDD = 2.7V to 3.65V, +85°C)
Parameter
Min
Data Retention
45
Max Units
- Years
Notes
Rev. 3.2
July 2005
Page 11 of 14
11 Page |
Páginas | Total 14 Páginas | |
PDF Descargar | [ Datasheet FM25CL64.PDF ] |
Número de pieza | Descripción | Fabricantes |
FM25CL64 | 64Kb FRAM Serial 3V Memory | ETC |
FM25CL64-S | 64Kb FRAM Serial 3V Memory | ETC |
FM25CL64B | 64-Kbit (8 K x 8) Serial (SPI) Automotive F-RAM | Cypress Semiconductor |
FM25CL64B | 3V F-RAM Memory | Ramtron |
Número de pieza | Descripción | Fabricantes |
SLA6805M | High Voltage 3 phase Motor Driver IC. |
Sanken |
SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |