CY15B256J
256-Kbit (32K × 8) Automotive-E Serial
(I2C) F-RAM
256-Kbit (32K × 8) Automotive-E Serial (I2C) F-RAM
Features
■ 256-Kbit ferroelectric random access memory (F-RAM)
logically organized as 32K × 8
❐ High-endurance 10 trillion (1013) read/writes
❐ 121-year data retention (See Data Retention and Endurance
on page 12)
❐ NoDelay™ writes
❐ Advanced high-reliability ferroelectric process
■ Fast two-wire serial interface (I2C)
❐ Up to 3.4-MHz frequency[1]
❐ Direct hardware replacement for serial EEPROM
❐ Supports legacy timings for 100 kHz and 400 kHz
■ Device ID
❐ Manufacturer ID and Product ID
■ Low power consumption
❐ 500-A active current at 100 kHz
❐ 500-A standby current
❐ 12-A sleep mode current
■ Low-voltage operation: VDD = 2.0 V to 3.6 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
Functional Description
The CY15B256J is a 256-Kbit nonvolatile memory employing an
advanced ferroelectric process. An 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
EEPROM and other nonvolatile memories.
Unlike EEPROM, the CY15B256J 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. F-RAM also exhibits much lower power during writes
than EEPROM because write operations do not require an
internally elevated power supply voltage for write circuits. The
CY15B256J is capable of supporting 1013 read/write cycles, or
10 million times more write cycles than EEPROM.
These capabilities make the CY15B256J ideal for nonvolatile
memory applications, requiring frequent or rapid writes.
Examples range from data logging, 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 combi-
nation of features allows more frequent data writing with less
overhead for the system.
The CY15B256J provides substantial benefits to users of serial
EEPROM as a hardware drop-in replacement. The device incor-
porates a read-only Device ID that allows the host to determine
the manufacturer, product density, and product revision. The
device specifications are guaranteed over an Automotive-E
temperature range of –40 C to +125 C.
Logic Block Diagram
Counter
Address
Latch
15
32 K x 8
F-RAM Array
8
SDA
SCL
WP
A0-A2
Serial to Parallel
Converter
Control Logic
Data Latch
8
8
Device ID and
Manufacturer ID
Note
1.
The CY15B256J does
Refer to DC Electrical
not meet the NXP
Characteristics on
I2C specification in the Fast-mode
page 11 for more details.
Plus
(Fm+,
1
MHz)
for
IOL
and
in
the
High
Speed
Mode
(Hs-mode,
3.4
MHz)
for
Vhys.
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 002-10968 Rev. *C
• San Jose, CA 95134-1709 • 408-943-2600
Revised November 26, 2018
