音影先锋亚洲天堂网|电影世界尽头的爱完整版播放|国产 熟女 91|高清无码免费观看欧美日韩|韩国一区二区三区黄色录像|美女亚洲加勒比在线|亚洲综合网 开心五月|7x成人在线入口|成人网站免费日韩毛片区|国产黄片?一级?二级?三级

U637H256DC25G1 Datasheet

  • U637H256DC25G1

  • CapStore 32K x 8 nvSRAM

  • 259.67KB

  • 14頁(yè)

  • SIMTEK

掃碼查看芯片數(shù)據(jù)手冊(cè)

上傳產(chǎn)品規(guī)格書

PDF預(yù)覽

U637H256
Not Recommended For New Designs
Features
High-performance CMOS non-
volatile static RAM 32768 x 8 bits
25 ns Access Time
10 ns Output Enable Access
Time
I
CC
= 15 mA typ. at 200 ns Cycle
Time
Unlimited Read and Write Cycles
to SRAM
Automatic STORE to EEPROM
on Power Down using charge
stored in an integrated capacitor
Software initiated STORE
Automatic STORE Timing
10
6
STORE cycles to EEPROM
100 years data retention in
EEPROM
Automatic RECALL on Power Up
Software RECALL Initiation
Unlimited RECALL cycles from
EEPROM
Single 5 V
鹵
10 % Operation
Operating temperature range:
0 to 70
擄C
-40 to 85擄C
QS 9000 Quality Standard
(MIL STD 883C M3015.7)
RoHS compliance and Pb- free
Package: PDIP28 (600 mil)
Description
The U637H256 has two separate
modes of operation: SRAM mode
and nonvolatile mode. In SRAM
mode, the memory operates as an
ordinary static RAM. In nonvolatile
operation, data is transferred in
parallel from SRAM to EEPROM or
from EEPROM to SRAM. In this
mode SRAM functions are disab-
led.
The U637H256 is a fast static RAM
(25 ns) with a nonvolatile electri-
cally erasable PROM (EEPROM)
element incorporated in each static
memory cell. The SRAM can be
read and written an unlimited num-
ber of times, while independent
nonvolatile
data
resides
in
EEPROM. Data transfers from the
SRAM to the EEPROM (the
STORE operation) take place auto-
matically upon power down using
charge stored in an integrated
capacitor. Transfers from the
EEPROM to the SRAM (the
RECALL operation) take place
automatically on power up. The
U637H256 combines the high per-
formance and ease of use of a fast
SRAM with nonvolatile data inte-
grity.
STORE cycles also may be initia-
ted under user control via a soft-
ware sequence.
Once a STORE cycle is initiated,
further input or output are disabled
until the cycle is completed.
Because a sequence of addresses
is used for STORE initiation, it is
important that no other read or
write accesses intervene in the
sequence or the sequence will be
aborted.
RECALL cycles may also be initia-
ted by a software sequence.
Internally, RECALL is a two step
procedure. First, the SRAM data is
cleared and second, the nonvola-
tile information is transferred into
the SRAM cells.
The RECALL operation in no way
alters the data in the EEPROM
cells. The nonvolatile data can be
recalled an unlimited number of
times.
The U637H256 is pin compatible
with standard SRAMs and standard
battery backed SRAMs.
CapStore
32K x 8 nvSRAM
Pin Configuration
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
VCC
W
A13
A8
A9
A11
G
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
Pin Description
Signal Name
A0 - A14
DQ0 - DQ7
E
G
W
VCC
VSS
Signal Description
Address Inputs
Data In/Out
Chip Enable
Output Enable
Write Enable
Power Supply Voltage
Ground
PDIP
21
20
19
18
17
16
15
Top View
August 15, 2006
STK Control #ML0056
1
Rev 1.1

U637H256DC25G1相關(guān)型號(hào)PDF文件下載

您可能感興趣的PDF文件資料

熱門IC型號(hào)推薦

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買家服務(wù)：
賣家服務(wù)：
技術(shù)客服：

0571-85317607

網(wǎng)站技術(shù)支持

13606545031

客服在線時(shí)間周一至周五
9:00-17:30

關(guān)注官方微信號(hào)，
第一時(shí)間獲取資訊。

建議反饋
返回頂部

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫(kù)提出的寶貴意見(jiàn)，您的參與是維庫(kù)提升服務(wù)的動(dòng)力！意見(jiàn)一經(jīng)采納，將有感恩紅包奉上哦！