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AT16C16 Datasheet(PDF) 3 Page - ATMEL Corporation

Part # AT16C16
Description  16K (2K x 8) Parallel EEPROMs
Download  12 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT16C16 Datasheet(HTML) 3 Page - ATMEL Corporation

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AT28C16
3
Device Operation
READ: The AT28C16 is accessed like a Static RAM.
When CE and OE are low and WE is high, the data stored
at the memory location determined by the address pins is
asserted on the outputs. The outputs are put in a high
impedance state whenever CE or OE is high. This dual line
control gives designers increased flexibility in preventing
bus contention.
BYTE WRITE: Writing data into the AT28C16 is similar to
writing into a Static RAM. A low pulse on the WE or CE
input with OE high and CE or WE low (respectively) ini-
tiates a byte write. The address location is latched on the
last falling edge of WE (or CE); the new data is latched on
the first rising edge. Internally, the device performs a self-
clear before write. Once a byte write has been started, it
will automatically time itself to completion. Once a pro-
gramming operation has been initiated and for the duration
of t
WC, a read operation will effectively be a polling opera-
tion.
FAST BYTE WRITE: The AT28C16E offers a byte write
time of 200
µs maximum. This feature allows the entire
device to be rewritten in 0.4 seconds.
DATA POLLING: The AT28C16 provides DATA POLLING
to signal the completion of a write cycle. During a write
cycle, an attempted read of the data being written results in
the complement of that data for I/O
7 (the other outputs are
indeterminate). When the write cycle is finished, true data
appears on all outputs.
WRITE PROTECTION: Inadvertent writes to the device
are protected against in the following ways: (a) V
CC
sense—if V
CC is below 3.8V (typical) the write function is
inhibited; (b) V
CC power on delay—once VCC has reached
3.8V the device will automatically time out 5 ms (typical)
before allowing a byte write; and (c) write inhibit—holding
any one of OE low, CE high or WE high inhibits byte write
cycles.
CHIP CLEAR: The contents of the entire memory of the
AT28C16 may be set to the high state by the CHIP CLEAR
operation. By setting CE low and OE to 12 volts, the chip is
cleared when a 10 msec low pulse is applied to WE.
DEVICE ID E N TIF I CAT IO N: An extr a 32 bytes of
EEPROM memory are available to the user for device iden-
tification. By raising A9 to 12
± 0.5V and using address
locations 7E0H to 7FFH the additional bytes may be written
to or read from in the same manner as the regular memory
array.


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