256-Kbit nonvolatile static random access memory (nvSRAM)
❐
Internally organized as 32 K × 8
❐
STORE to QuantumTrap nonvolatile elements initiated
automatically on power-down (AutoStore) or by using I
2
C
command (Software STORE) or HSB pin (Hardware STORE)
❐
RECALL to SRAM initiated on power-up (Power-Up
RECALL) or by I
2
C command (Software RECALL)
❐
Automatic STORE on power-down with a small capacitor
(except for CY14MX256J1)
High reliability
❐
❐
❐
Industry standard configurations
❐
Operating voltages:
• CY14MC256J: V
CC
= 2.4 V to 2.6 V
• CY14MB256J: V
CC
= 2.7 V to 3.6 V
• CY14ME256J: V
CC
= 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
CY14MC256J/CY14MB256J/CY14ME256J
combines a 256-Kbit nvSRAM
[2]
with a nonvolatile element in
each memory cell. The memory is organized as 32 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 CY14MX256J1). 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 I
2
C
commands.
■
Infinite read, write, and RECALL cycles
1 million STORE cycles to QuantumTrap
Data retention: 20 years at 85
C
■
High speed I
2
C interface
[1]
❐
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 one quarter, half, or entire array
I C 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
2
■
Configuration
Feature
AutoStore
Software
STORE
Hardware
STORE
Slave Address
pins
CY14MX256J1 CY14MX256J2 CY14MX256J3
No
Yes
No
A2, A1, A0
Yes
Yes
No
A2, A1
Yes
Yes
Yes
A2, A1, A0
■
■
Logic Block Diagram
V
CC
V
CAP
Serial Number
8x8
Manufacturer ID /
Product ID
Memory Control Register
Command Register
Sleep
QuantumTrap
32 K x 8
SRAM
32 K x 8
STORE
RECALL
Power Control
Block
SDA
SCL
A2, A1, A0
WP
I C Control Logic
Slave Address
Decoder
2
Control Registers Slave
Memory Slave
Memory
Address and Data
Control
Notes
1. The I
2
C nvSRAM is a single solution which is usable for all four speed modes of operation. As a result, some I/O parameters are slightly different than those on chips
which support only one mode of operation. Refer to
AN87209
for more details.
2. Serial (I
2
C) nvSRAM is referred to as nvSRAM throughout the datasheet.
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