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參數(shù)資料
| 型號： | WME128K8-125DEQ |
| 廠商： | WHITE ELECTRONIC DESIGNS CORP |
| 元件分類： | PROM |
| 英文描述： | 128K X 8 EEPROM 5V, 125 ns, CDSO32 |
| 封裝： | 0.400 INCH, HERMETIC SEALED, CERAMIC, SOJ-32 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 320K |
| 代理商： | WME128K8-125DEQ |
6
White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
White Electronic Designs
WME128K8-XXX
January 2008
Rev. 6
White Electronic Designs Corp. reserves the right to change products or specications without notice.
DATA POLLING
The WME128K8-XXX offers a data polling feature which
allows a faster method of writing to the device. Figure 6
shows the timing diagram for this function. During a byte
or page write cycle, an attempted read of the last byte
written will result in the complement of the written data on
I/O7. Once the write cycle has been completed, true data
is valid on all outputs and the next cycle may begin. Data
polling may begin at any time during the write cycle.
FIGURE 6 – DATA POLLING WAVEFORMS
DATA POLLING CHARACTERISTICS
VCC = 5.0V, VSS = 0V, -55°C ≤ TA ≤ +125°C
Parameter
Symbol
Min
Max
Unit
Data Hold Time
tdh
10
ns
OE# Hold Time
toeh
10
ns
OE# To Output Valid
toe
55
ns
Write Recovery Time
twr
0
ns
WE#
t OEH
t DH
t OE
t WR
HIGH Z
CS#
OE#
I/O7
ADDRESS
TOGGLE BUT CHARACTERISTICS(1)
Symbol
Parameter
Min
Max
Units
tDH
Data Hold Time
10
ns
tOEH
OE Hold Time
10
ns
tOE
OE to Output Delay
ns
tOEHP
OE High Pulse
150
ns
tWR
Write Recovery Time
0
ns
TOGGLE BIT: In addition to DATA# Polling another method
for determining the end of a write cycle is provided . During
the write operation, successive attempts to read data from
the device will result in I/O6 toggling between one and zero.
Once the write has completed, I/O6 will stop toggling and
valid data will be read. Reading the toggle bit may begin
at any time during the write cycle.
NOTE:
1. Toggling either OE# or CS# or both OE# and CS# will operate toggle bit.
2. Beginning and ending state of I/O6 will vary
3. Any address location may be used but the address should not vary.
tWR
HIGH Z
tDH
tOE
tOEH
WE#
CS#
OE#
I/O6 (2)
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| WME128K8-140CC | 制造商:Microsemi Corporation 功能描述:128K X 8 EEPROM MONOLITHIC, 140NS, 32 DIP, COMMERCIAL SCREEN - Bulk |
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