The DS1220Y 16k Nonvolatile SRAM is a 16,384-bit, fully static, nonvolatile RAM organized as 2048
words by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry that
constantly monitor V
CC
for an out-of-tolerance condition. When such a condition occurs, the lithium
energy source is automatically switched on and write protection is unconditionally enabled to prevent
data corruption. The NV SRAM can be used in place of existing 2k x 8 SRAMs directly conforming to
the popular bytewide 24-pin DIP standard. The DS1220Y also matches the pinout of the 2716 EPROM or
the 2816 EEPROM, allowing direct substitution while enhancing performance. There is no limit on the
number of write cycles that can be executed and no additional support circuitry is required for
microprocessor interfacing.
1 of 9
NOT RECOMMENDED FOR NEW DESIGNS
DS1220Y
READ MODE
The DS1220Y executes a read cycle whenever
WE
(Write Enable) is inactive (high) and
CE
(Chip
Enable) and OE (Output Enable) are active (low). The unique address specified by the 11 address inputs
(A0-A10) defines which of the 2048 bytes of data is to be accessed. Valid data will be available to the
eight data output drivers within t
ACC
(Access Time) after the last address input signal is stable, providing
that
CE
and
OE
access times are also satisfied. If
CE
and OE access times are not satisfied, then data
access must be measured from the later-occurring signal and the limiting parameter is either t
CO
for
CE
or
t
OE
for
OE
rather than address access.
WRITE MODE
The DS1220Y executes a write cycle whenever the WE and CE signals are active (low) after address
inputs are stable. The later-occurring falling edge of
CE
or
WE
will determine the start of the write
cycle. The write cycle is terminated by the earlier rising edge of
CE
or
WE
. All address inputs must be
kept valid throughout the write cycle.
WE
must return to the high state for a minimum recovery time
(t
WR
) before another cycle can be initiated. The
OE
control signal should be kept inactive (high) during
write cycles to avoid bus contention. However, if the output drivers are enabled (
CE
and
OE
active)
then WE will disable the outputs in t
ODW
from its falling edge.
DATA RETENTION MODE
The DS1220Y provides full-functional capability for V
CC
greater than 4.5 volts and write protects at 4.25
nominal. Data is maintained in the absence of V
CC
without any additional support circuitry. The
DS1220Y constantly monitors V
CC
. Should the supply voltage decay, the NV SRAM automatically write
protects itself, all inputs become “don’t care,” and all outputs become high-impedance. As V
CC
falls
below approximately 3.0 volts, a power switching circuit connects the lithium energy source to RAM to
retain data. During power-up, when V
CC
rises above approximately 3.0 volts, the power switching circuit
connects external V
CC
to RAM and disconnects the lithium energy source. Normal RAM operation can
resume after V
CC
exceeds 4.5 volts.
2 of 9
NOT RECOMMENDED FOR NEW DESIGNS
DS1220Y
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground
Operating Temperature Range
Commercial:
Industrial:
Storage Temperature
Lead Temperature (soldering, 10s)
Note:
EDIP is wave or hand soldered only.
-0.3V to +6.0V
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
+260°C
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
I recently built a tms320vc5416 board. The programming is normal.But it cannot be executed when powered on. I need to press the reset button to work normally. What is the reason?...
Jiuyuan Electronic Technology Co., Ltd. is a professional testing equipment/solution provider with high cost performance and comprehensive services. At present, we provide a variety of testing equipme...
FTP, or Text Transfer Protocol, is the main Internet standard for file transfer. The main function of FTP is defined as reliably and efficiently transferring files between hosts and allowing convenien...
RT, when I use DE1-SOC to call the camera, the following problem occursIt shows that my DMA space is too small. How can I increase the DMA space? I saw on the Internet that UBOOT can be set when booti...
The USB disk stores the microcontroller serial port data. There is a file generated and the file size is shown, but it is empty when opened. The cursor can be positioned at any position. When the back...
The intelligent driving community has its own rhythm. Some are busy pushing new versions and focusing on R&D, others are busy with publicity and promotion, and still others are immersed in mass pro...[Details]
While
the solid-state battery
industry is still engaged in a long technological marathon for
the "ultimate solution" for
electric vehicles
, some companies have begun looking for mor...[Details]
As more and more consumers purchase new energy vehicles, the safety of electric vehicles has become a major concern. This has been particularly prominent following a series of electric vehicle fire...[Details]
New energy vehicles are increasingly popular with consumers due to policies and energy conservation. Once you've purchased your vehicle, maintenance is essential. However, due to the different powe...[Details]
With the rapid development of technology, automotive intelligence is increasing at an unprecedented rate. This not only enhances vehicle functionality and comfort, but also places higher deman...[Details]
In recent years, with the application of the IEC61850 standard and the development and deployment of optoelectronic transformers, the concept of digital substations has been put into practical use ...[Details]
Definition of interactive projection system:
Interactive projection systems, also known as multimedia interactive projection, are available in floor, wall, and tabletop interactive projection....[Details]
The digital TV set-top box consists of a tuner, QAM demodulator, TS demultiplexer, MPEG-2 decoder, PAUNTSC video encoder, embedded CPU system and peripheral interfaces, CA module, and uplink data m...[Details]
Through AI connection technology supported by Qualcomm X85 5G modem and RF and Qualcomm FastConnect 7900 mobile connection system, seamless switching can be achieved between cellular net...[Details]
"We have successfully launched the first version of our dedicated chip for EMB brake-by-wire. Second-generation samples have also been successfully completed, and we are actively planning a third-g...[Details]
Recently, Joyson Electronics has made positive progress in the core technology research and development of the robot's "brain and brain" and key components, and launched the industry's first integr...[Details]
Facial recognition, a biometric technology that uses facial features to authenticate identity, has rapidly become a global market hotspot in recent years as the technology has entered practical use...[Details]
As the core of electric vehicles, batteries are concerned with vehicle use and maintenance. The operation of vehicles is guaranteed by the electricity generated by batteries. For batteries, battery...[Details]
The power transmission system between a car's engine and drive wheels is called its drivetrain. It ensures the necessary traction and speed under various driving conditions, and coordinates these t...[Details]
Charge your electric car for just six minutes and you'll get 1,000 kilometers! This isn't just a scene from a science fiction film, but a reality made possible by Guoxuan High-Tech's Jinshi solid-s...[Details]
Electronics Design Contest
京公网安备 11010802033920号
EEWORLD
