DataSheet.jp

AT29C256-90JC の電気的特性と機能

AT29C256-90JCのメーカーはATMEL Corporationです、この部品の機能は「256K 32K x 8 5-volt Only CMOS Flash Memory」です。


製品の詳細 ( Datasheet PDF )

部品番号 AT29C256-90JC
部品説明 256K 32K x 8 5-volt Only CMOS Flash Memory
メーカ ATMEL Corporation
ロゴ ATMEL Corporation ロゴ 




このページの下部にプレビューとAT29C256-90JCダウンロード(pdfファイル)リンクがあります。

Total 12 pages

No Preview Available !

AT29C256-90JC Datasheet, AT29C256-90JC PDF,ピン配置, 機能
AT29C256
Features
Fast Read Access Time - 70 ns
5-Volt-Only Reprogramming
•• Page Program Operation
Single Cycle Reprogram (Erase and Program)
Internal Address and Data Latches for 64-Bytes
Internal Program Control and Timer
Hardware and Software Data Protection
•• Fast Program Cycle Times
Page (64-Byte) Program Time - 10 ms
Chip Erase Time - 10 ms
DATA Polling for End of Program Detection
•• Low Power Dissipation
50 mA Active Current
300 µA CMOS Standby Current
Typical Endurance > 10,000 Cycles
•• Single 5V ± 10% Supply
CMOS and TTL Compatible Inputs and Outputs
•• Commercial and Industrial Temperature Ranges
256K (32K x 8)
5-volt Only
CMOS Flash
Memory
Description
The AT29C256 is a 5-volt-only in-system Flash programmable and erasable read only
memory (PEROM). Its 256K of memory is organized as 32,768 words by 8 bits. Manu-
factured with Atmel’s advanced nonvolatile CMOS technology, the device offers ac-
cess times to 70 ns with power dissipation of just 275 mW. When the device is dese-
lected, the CMOS standby current is less than 300 µA. The device endurance is such
that any sector can typically be written to in excess of 10,000 times.
Pin Configurations
Pin Name Function
DIP Top View
(continued)
A0 - A14 Addresses
CE Chip Enable
OE Output Enable
WE Write Enable
I/O0 - I/O7 Data Inputs/Outputs
NC No Connect
DC Don’t Connect
AT29C256
PLCC Top View
TSOP Top View
Type 1
Note: PLCC package pins 1 and 17
are DON’T CONNECT.
0046L
4-93

1 Page





AT29C256-90JC pdf, ピン配列
AT29C256
Device Operation (Continued)
Once set, software data protection will remain active un-
less the disable command sequence is issued.
After setting SDP, any attempt to write to the device with-
out the 3-byte command sequence will start the internal
write timers. No data will be written to the device; however,
for the duration of tWC, a read operation will effectively be
a polling operation.
After the software data protection’s 3-byte command code
is given, a byte load is performed by applying a low pulse
on the WE or CE input with CE or WE low (respectively)
and OE high. The address is latched on the falling edge of
CE or WE, whichever occurs last. The data is latched by
the first rising edge of CE or WE. The 64-bytes of data
must be loaded into each sector by the same procedure as
outlined in the program section under device operation.
HARDWARE DATA PROTECTION: Hardware features
protect against inadvertent programs to the AT29C256 in
the following ways: (a) VCC sense— if VCC is below 3.8V
(typical), the program function is inhibited. (b) VCC power
on delay— once VCC has reached the VCC sense level,
the device will automatically time out 5 ms (typical) before
programming. (c) Program inhibit— holding any one of OE
low, CE high or WE high inhibits program cycles. (d) Noise
filter— pulses of less than 15 ns (typical) on the WE or CE
inputs will not initiate a program cycle.
PRODUCT IDENTIFICATION: The product identifica-
tion mode identifies the device and manufacturer and may
be accessed by a hardware operation. For details, see
Operating Modes or Product Identification.
DATA POLLING: The AT29C256 features DATA poll-
ing to indicate the end of a program cycle. During a pro-
gram cycle an attempted read of the last byte loaded will
result in the complement of the loaded data on I/O7. Once
the program cycle has been completed, true data is valid
on all outputs and the next cycle may begin. DATA polling
may begin at any time during the program cycle.
TOGGLE BIT: I n a d d i t i o n t o DATA p o l l i n g t h e
AT29C256 provides another method for determining the
end of a program or erase cycle. During a program or
erase operation, successive attempts to read data from
the device will result in I/O6 toggling between one and
zero. Once the program cycle has completed, I/O6 will
stop toggling and valid data will be read. Examining the
toggle bit may begin at any time during a program cycle.
OPTIONAL CHIP ERASE MODE: The entire device
can be erased by using a 6-byte software code. Please
see Software Chip Erase application note for details.
Absolute Maximum Ratings*
Temperature Under Bias................. -55°C to +125°C
Storage Temperature...................... -65°C to +150°C
All Input Voltages
(including NC Pins)
with Respect to Ground ................... -0.6V to +6.25V
All Output Voltages
with Respect to Ground .............-0.6V to VCC + 0.6V
Voltage on OE
with Respect to Ground ................... -0.6V to +13.5V
*NOTICE: Stresses beyond those listed under “Absolute Maxi-
mum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the
device at these or any other conditions beyond those indi-
cated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
4-95


3Pages


AT29C256-90JC 電子部品, 半導体
AC Byte Load Characteristics
Symbol
tAS, tOES
tAH
tCS
tCH
tWP
tDS
tDH, tOEH
tWPH
Parameter
Address, OE Set-up Time
Address Hold Time
Chip Select Set-up Time
Chip Select Hold Time
Write Pulse Width (WE or CE)
Data Set-up Time
Data, OE Hold Time
Write Pulse Width High
AC Byte Load Waveforms
WE Controlled
Min
0
50
0
0
90
35
0
100
Max Units
ns
ns
ns
ns
ns
ns
ns
ns
CE Controlled
4-98 AT29C256

6 Page



ページ 合計 : 12 ページ
 
PDF
ダウンロード
[ AT29C256-90JC データシート.PDF ]


データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。


共有リンク

Link :


部品番号部品説明メーカ
AT29C256-90JC

256K 32K x 8 5-volt Only CMOS Flash Memory

ATMEL Corporation
ATMEL Corporation
AT29C256-90JI

256K 32K x 8 5-volt Only CMOS Flash Memory

ATMEL Corporation
ATMEL Corporation


www.DataSheet.jp    |   2020   |  メール    |   最新    |   Sitemap