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WE512K16-140G4C Datasheet PDF : 10 Pages
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White Electronic Designs
WE512K16-XG4X
PAGE WRITE OPERATION
The module has a page write operation that allows one
to 128 words of data to be written into the device and
consecutively loads during the internal programming
period. Successive words may be loaded in the same
manner after the first data word has been loaded. An
internal timer begins a time out operation at each write
cycle. If another write cycle is completed within 150µs
or less, a new time out period begins. Each write cycle
restarts the delay period. The write cycles can be continued
as long as the interval is less than the time out period.
The usual procedure is to increment the least significant
address lines from A0 through A6 at each write cycle. In this
manner a page of up to 128 words can be loaded in to the
EEPROM in a burst mode before beginning the relatively
long interval programming cycle.
After the 150µs time out is completed, the EEPROM begins
an internal write cycle. During this cycle the entire page
of words will be written at the same time. The internal
programming cycle is the same regardless of the number
of words accessed.
PAGE WRITE CHARACTERISTICS
VCC = 5.0V, VSS = 0V, -55°C ≤ TA ≤ +125°C
Page Mode Write Characteristics Symbol
Unit
Parameter
Min Max
Write Cycle Time, TYP = 6ms
tWC
10 ms
Address Set-up Time
tAS
0
ns
Address Hold Time (1)
tAH
50
ns
Data Set-up Time
tDS
50
ns
Data Hold Time
tDH
0
ns
Write Pulse Width
tWP 100
ns
Word Load Cycle Time
tBLC
150 µs
Write Pulse Width High
tWPH
50
ns
1. Page address must remain valid for duration of write cycle.
FIGURE 7 – PAGE MODE WRITE WAVEFORM
OE#
CS#
WE#
ADDRESS (1)
tAS
tAH
VALID
ADDRESS
DATA
WORD 0
WORD 1
WORD 2 WORD 3
WORD 126 WORD 127
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
April 1999
Rev. 2
7
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
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