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PDF CY14ME064J Data sheet ( Hoja de datos )
| Número de pieza | CY14ME064J | |
| Descripción | 64-Kbit (8 K x 8) Serial (I2C) nvSRAM | |
| Fabricantes | Cypress Semiconductor | |
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CY14MB064J
CY14ME064J
64-Kbit (8 K × 8) Serial (I2C) nvSRAM
64-Kbit (8 K × 8) Serial (I2C) nvSRAM
Features
■ 64-Kbit nonvolatile static random access memory (nvSRAM)
❐ Internally organized as 8 K × 8
❐ STORE to QuantumTrap nonvolatile elements initiated
automatically on power-down (AutoStore) or by using I2C
command (Software STORE) or HSB pin (Hardware STORE)
❐
RECALL
RECALL)
to
or
bySIR2CAMcominmitaiantedd(SoofntwaproewReEr-CuApLL(P) ower-Up
❐ Automatic STORE on power-down with a small capacitor
(except for CY14MX064J1)
■ High reliability
❐ Infinite read, write, and RECALL cycles
❐ 1 million STORE cycles to QuantumTrap
❐ Data retention: 20 years at 85 C
■ High speed I2C interface
❐ Industry standard 100 kHz and 400 kHz speed
❐ Fast-mode Plus: 1 MHz speed
❐ High speed: 3.4 MHz
❐ Zero cycle delay reads and writes
■ Write protection
❐ Hardware protection using Write Protect (WP) pin
❐ Software block protection for 1/4, 1/2, or entire array
■ I2C access to special functions
❐ Nonvolatile STORE/RECALL
❐ 8 byte serial number
❐ Manufacturer ID and Product ID
❐ Sleep mode
■ Low power consumption
❐ Average active current of 1 mA at 3.4 MHz operation
❐ Average standby mode current of 150 µA
❐ Sleep mode current of 8 µA
■ Industry standard configurations
❐ Operating voltages:
• CY14MB064J: VCC = 2.7 V to 3.6 V
• CY14ME064J: VCC = 4.5 V to 5.5 V
❐ Industrial temperature
❐ 8- and 16-pin small outline integrated circuit (SOIC) package
❐ Restriction of hazardous substances (RoHS) compliant
Overview
The Cypress CY14MB064J/CY14ME064J combines a 64-Kbit
nvSRAM[1] with a nonvolatile element in each memory cell. The
memory is organized as 8 K words of 8 bits each. The embedded
nonvolatile elements incorporate the QuantumTrap technology,
creating the world’s most reliable nonvolatile memory. The
SRAM provides infinite read and write cycles, while the
QuantumTrap cells provide highly reliable nonvolatile storage of
data. Data transfers from SRAM to the nonvolatile elements
(STORE operation) takes place automatically at power-down
(except for CY14MX064J1). On power-up, data is restored to the
SRAM from the nonvolatile memory (RECALL operation). The
STORE and RECALL operations can also be initiated by the user
through I2C commands.
Configuration
Feature
AutoStore
Software
STORE
Hardware
STORE
Slave Address
pins
CY14MX064J1 CY14MX064J2 CY14MX064J3
No Yes Yes
Yes Yes Yes
No No Yes
A2, A1, A0
A2, A1
A2, A1, A0
Logic Block Diagram
VCC VCAP
Power Control
Block
Sleep
Serial Number
8x8
Manufacture ID/
Product ID
Memory Control Register
Command Register
SDA
SCL
A2, A1, A0
WP
2
I C Control Logic
Slave Address
Decoder
Control Registers Slave
Memory Slave
Memory
Address and Data
Control
Note
1. Serial (I2C) nvSRAM is referred to as nvSRAM throughout the datasheet.
Quantrum Trap
8Kx8
SRAM
8Kx8
STORE
RECALL
Cypress Semiconductor Corporation • 198 Champion Court
wwwD.DocautamSheenett4#U: .0n0et1- 65051 Rev. *B
• San Jose, CA 95134-1709 • 408-943-2600
Revised May 6, 2011
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CY14MB064J
CY14ME064J
Data Validity
STOP Condition (P)
The data on the SDA line must be stable during the HIGH period
of the clock. The state of the data line can only change when the
clock on the SCL line is LOW for the data to be valid. There are
only two conditions under which the SDA line may change state
with SCL line held HIGH, that is, START and STOP condition.
The START and STOP conditions are generated by the master
to signal the beginning and end of a communication sequence
on the I2C bus.
START Condition (S)
A HIGH to LOW transition on the SDA line while SCL is HIGH
indicates a START condition. Every transaction in I2C begins
with the master generating a START condition.
A LOW to HIGH transition on the SDA line while SCL is HIGH
indicates a STOP condition. This condition indicates the end of
the ongoing transaction.
START and STOP conditions are always generated by the
master. The bus is considered to be busy after the START
condition. The bus is considered to be free again after the STOP
condition.
Repeated START (Sr)
If an Repeated START condition is generated instead of a STOP
condition the bus continues to be busy. The ongoing transaction
on the I2C lines is stopped and the bus waits for the master to
send a slave ID for communication to restart.
Figure 4. START and STOP Conditions
full pagewidth
SDA
SDA
SCL
S
SCL
P
START Condition
STOP Condition
Figure 5. Data Transfer on the I2C Bus
handbook, full pagewidth
SDA
MSB
Acknowledgement
signal from slave
P
Acknowledgement Sr
signal from receiver
SCL
S
or
Sr
1
START or
Repeated START
condition
2
789
ACK
Byte complete,
interrupt within slave
1 2 3-8 9
ACK
Clock line held LOW while
interrupts are serviced
Sr
or
P
STOP or
Repeated START
condition
Byte Format
Each operation in I2C is done using 8 bit words. The bits are sent
in MSB first format on SDA line and each byte is followed by an
ACK signal by the receiver.
An operation continues till a NACK is sent by the receiver or
STOP or Repeated START condition is generated by the master
The SDA line must remain stable when the clock (SCL) is HIGH
except for a START or STOP condition.
Acknowledge / No-acknowledge
After transmitting one byte of data or address, the transmitter
releases the SDA line. The receiver pulls the SDA line LOW to
acknowledge the receipt of the byte. Every byte of data
transferred on the I2C bus needs to be responded with an ACK
signal by the receiver to continue the operation. Failing to do so
is considered as a NACK state. NACK is the state where receiver
does not acknowledge the receipt of data and the operation is
aborted.
NACK can be generated by master during a READ operation in
following cases:
■ The master did not receive valid data due to noise
■ The master generates a NACK to abort the READ sequence.
After a NACK is issued by the master, nvSRAM slave releases
control of the SDA pin and the master is free to generate a
Repeated START or STOP condition.
NACK can be generated by nvSRAM slave during a WRITE
operation in following cases:
■ nvSRAM did not receive valid data due to noise.
■ The master tries to access write protected locations on the
nvSRAM. Master must restart the communication by
generating a STOP or Repeated START condition.
Document #: 001- 65051 Rev. *B
Page 5 of 31
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CY14MB064J
CY14ME064J
Figure 11. Single-Byte Write into nvSRAM (except Hs-mode)
By Master
SDA Line
By nvSRAM
S
T
A
R Memory Slave Address
T
S 1 0 1 0 A2 A1 A0 0
Address MSB
X XX
A
Address LSB
AA
Data Byte
S
T
0
P
P
A
Figure 12. Multi-Byte Write into nvSRAM (except Hs-mode)
By Master
SDA Line
By nvSRAM
S
T
A
R Memory Slave Address
T
S 1 0 1 0 A2 A1 A0 0
Address MSB
XX X
A
Address LSB
AA
Data Byte 1
A
Figure 13. Single-Byte Write into nvSRAM (Hs-mode)
Data Byte N
S
T
0
P
P
A
By Master
SDA Line
By nvSRAM
S
T
A
R Hs-mode command
T
S00 0 01 XX X
Memory Slave Address
Sr 1 0 1 0 A2 A1 A0 0
Address MSB
XX X
AA
A
Address LSB
Figure 14. Multi-Byte Write into nvSRAM (Hs-mode)
A
Data Byte
S
T
0
P
P
A
By Master
SDA Line
By nvSRAM
S
T
A
R Hs-mode command
T
S00 0 01 XX X
Memory Slave Address
Sr 1 0 1 0 A2 A1 A0 0
Address MSB
XX X
AA
A
By Master
SDA Line
By nvSRAM
Data Byte 2
Data Byte 3
Data Byte N
AA
Address LSB
S
T
0
P
P
A
A
Data Byte 1
A
Document #: 001- 65051 Rev. *B
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