- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄371196 > X22C12SMB Nonvolatile Static RAM PDF資料下載
參數(shù)資料
| 型號： | X22C12SMB |
| 英文描述： | Nonvolatile Static RAM |
| 中文描述： | 非易失性靜態(tài)RAM |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 60K |
| 代理商： | X22C12SMB |
X22C12
2
PIN DESCRIPTIONS AND DEVICE OPERATION
Addresses (A
0
–A
7
)
The address inputs select a 4-bit memory location
during a read or write operation.
Chip Select (
CS
)
The Chip Select input must be LOW to enable read or
write operations with the RAM array.
CS
HIGH will place
the I/O pins in the high impedance state.
Write Enable (
WE
)
The Write Enable input controls the I/O buffers, deter-
mining whether a RAM read or write operation is en-
abled. When
CS
is LOW and
WE
is HIGH, the I/O pins
will output data from the selected RAM address loca-
tions. When both
CS
and
WE
are LOW, data presented
at the I/O pins will be written to the selected address
location.
Data In/Data Out (I/O
1
–I/O
4
)
Data is written to or read from the X22C12 through the
I/O pins. The I/O pins are placed in the high impedance
state when either
CS
is HIGH or during either a store or
recall operation.
STORE
The
STORE
input, when LOW, will initiate the transfer of
the entire contents of the RAM array to the E
2
PROM
array. The
WE
and
RECALL
inputs are inhibited during
the store cycle. The store operation is completed in 5ms
or less.
A store operation has priority over RAM read/write
operations. If
STORE
is asserted during a read opera-
tion, the read will be discontinued. If
STORE
is asserted
during a RAM write operation, the write will be immedi-
ately terminated and the store performed. The data at
the RAM address that was being written will be unknown
in both the RAM and E
2
PROM arrays.
RECALL
The
RECALL
input, when LOW, will initiate the transfer
of the entire contents of the E
2
PROM array to the RAM
array. The transfer of data will be completed in 1
μ
s or
less.
An array recall has priority over RAM read/write opera-
tions and will terminate both operations when
RECALL
is asserted.
RECALL
LOW will also inhibit the
STORE
input.
Automatic Recall
Upon power-up the X22C12 will automatically recall
data from the E
2
PROM array into the RAM array.
Write Protection
The X22C12 has three write protect features that are
employed to protect the contents of the nonvolatile
memory.
V
CC
Sense—All functions are inhibited when V
CC
is
<3.5V typical.
Write Inhibit—Holding either
STORE
HIGH or
RECALL
LOW during power-up or power-down will
prevent an inadvertent store operation and E
2
PROM
data integrity will be maintained.
Noise Protection—A
STORE
pulse of typically less
than 20ns will not initiate a store cycle.
PIN NAMES
Symbol
A
0
–A
7
I/O
1
–I/O
4
WE
CS
RECALL
STORE
V
CC
V
SS
NC
Description
Address Inputs
Data Inputs/Outputs
Write Enable
Chip Select
Recall
Store
+5V
Ground
No Connect
3817 PGM T01
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X22C12D | Nonvolatile Static RAM |
| X22C12DI | Nonvolatile Static RAM |
| X22C12DM | Nonvolatile Static RAM |
| X22C12P | Nonvolatile Static RAM |
| X22C12PI | Nonvolatile Static RAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X22M118400L003 | 制造商:AEL CRYSTALS 功能描述:CRYSTAL 22.118400MHZ 制造商:AEL Crystals LTD 功能描述:CRYSTAL, 22.118400MHZ 制造商:AEL CRYSTALS 功能描述:CRYSTAL 22.1184MHZ THRU HOLE; Frequency:22.1184MHz; Frequency Tolerance: 30ppm; Load Capacitance:30pF; Operating Temperature Min:-10C; Operating Temperature Max:60C; Crystal Mounting Type:Through Hole; Crystal Case Type:HC-49/U ;RoHS Compliant: Yes |
| X22RP | 功能描述:消費(fèi)電池與相機(jī)電池 9V 655mAh Titanium Alkaline RoHS:否 制造商:FDK Batteries 電池大小:CR1/3N 輸出電壓:3 V 容量:160 mAh 化學(xué)性質(zhì):Lithium 端接類型:Pressure Contacts 可再充電/不可再充電:Non-Rechargeable |
| X22RP-2 | 功能描述:消費(fèi)電池與相機(jī)電池 9V 655mAh 2 PK Titanium Alkaline RoHS:否 制造商:FDK Batteries 電池大小:CR1/3N 輸出電壓:3 V 容量:160 mAh 化學(xué)性質(zhì):Lithium 端接類型:Pressure Contacts 可再充電/不可再充電:Non-Rechargeable |
| X23 | 制造商:Panasonic Industrial Company 功能描述:FUSE |
| X-23 | 功能描述:音頻指示器及警報器 98 dba 32VDC 2800Hz RoHS:否 制造商:PUI Audio 產(chǎn)品:Indicators 聲壓級:85 dB 音調(diào):Continuous 頻率:2300 Hz +/- 300 Hz 電壓額定值:5 VDC 電流額定值:30 mA 端接類型: 直徑:12 mm 安裝:Through Hole |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。