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X22C10 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - Nonvolatile Static RAM - Xicor

भाग संख्या X22C10
समारोह Nonvolatile Static RAM
मैन्युफैक्चरर्स Xicor 
लोगो Xicor लोगो 
पूर्व दर्शन
1 Page
		
<?=X22C10?> डेटा पत्रक पीडीएफ

X22C10 pdf
X22C10
PIN DESCRIPTIONS AND DEVICE OPERATION
Addresses (A0–A5)
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/O1–I/O4)
Data is written to or read from the X22C10 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 E2PROM
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 E2PROM arrays.
RECALL
The RECALL input, when LOW, will initiate the transfer
of the entire contents of the E2PROM array to the RAM
array. The transfer of data will be completed in 1µs 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 X22C10 will automatically recall
data from the E2PROM array into the RAM array.
Write Protection
The X22C10 has three write protect features that are
employed to protect the contents of the nonvolatile
memory.
• VCC Sense—All functions are inhibited when VCC 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 E2PROM
data integrity will be maintained.
• Noise Protection—A STORE pulse of typically less
than 20ns will not initiate a store cycle.
PIN NAMES
Symbol
A0–A5
I/O1–I/O4
WE
CS
RECALL
STORE
VCC
VSS
NC
Description
Address Inputs
Data Inputs/Outputs
Write Enable
Chip Select
Recall
Store
+5V
Ground
No Connect
3815 PGM T01
2

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डाउनलोड[ X22C10 Datasheet.PDF ]


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