WSE128K16-35G2TC Просмотр технического описания (PDF) - White Electronic Designs => Micro Semi
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WSE128K16-35G2TC Datasheet PDF : 15 Pages
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White Electronic Designs
WSE128K16-XXX
PRELIMINARY
EEPROM PAGE WRITE OPERATION
The WSE128K16-XXX has a page write operation
that allows one to 128 bytes of data to be written into
the device and consecutively loads during the internal
programming period. Successive bytes may be loaded
in the same manner after the first data byte 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 bytes 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 bytes will be written at the same time. The internal
programming cycle is the same regardless of the number
of bytes accessed.
EEPROM PAGE WRITE CHARACTERISTICS
VCC = 5.0V, GND = 0V, -55°C ≤ TA ≤ +125°C
Page Mode Write Characteristics
Parameter
Symbol
Min
Max
Unit
Write Cycle Time, TYP = 6ms
tWC
10 ms
Address Set-up Time
tAS
0
ns
Address Hold Time (1)
tAH
100
ns
Data Set-up Time
tDS
100
ns
Data Hold Time
tDH
10
ns
Write Pulse Width
tWP
150
ns
Byte Load Cycle Time
tBLC
150 µs
Write Pulse Width High
tWPH
50
ns
NOTE:
1. Page address must remain valid for duration of write cycle.
FIGURE 11 – EEPROM PAGE MODE WRITE WAVEFORMS
OE#
ECS#1-2
EWE#1-2
ADDRESS
EEPROM
DATA
tWP
t WPH
t BL C
tAS tAH
VALID
ADDRESS
tDS tDH
VALID
DATA
BYTE 0 BYTE 1
BYTE 2
tWC
BYTE 3 BYTE 127
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
March 2005
Rev. 3
10
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
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