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參數資料
型號: W28V400TT85C
廠商: WINBOND ELECTRONICS CORP
元件分類: PROM
英文描述: 4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY
中文描述: 256K X 16 FLASH 2.7V PROM, 120 ns, PDSO48
封裝: 12 X 20 MM, TSOP-48
文件頁數: 45/48頁
文件大小: 1822K
代理商: W28V400TT85C
W28V400B/T
Publication Release Date: April 11, 2003
- 45 -
Revision A4
Recommended Operating Conditions
At Device Power-up
AC timing illustrated in Figure 18 is recommended for the supply voltages and the control signals at
device power-up. If the timing in the figure is ignored, the device may not operate correctly.
VH
VL
DD
VIH
VIL
VH
VL
#OE
Valid Address
V
DD
V
Vss
(min)
t
VR
t
R
t
2VPH
t
PHQV
*1
#RESETp)
*2
Vpp
(V)
Vss
V
PPH1/2
ADDRESS
VIH
VIL
(A)
t
t
RorF
t
t
Ror F
t
AVQV
#CE (E)
t
R
t
F
t
ELQV
t
GLQV
#WE (W)
VH
VL
(G)
t
F
t
R
#WP (S)
VH
VL
DATA(D/Q)
VOH
VOL
Valid Output
HIGH Z
*1 t
5VPH
for the device in 5V operations.
*2 To prevent the unwanted writes, system designers should consider the V
PP
switch, which connects V
PP
to V
SS
during read
operations and V
PPH1/2/3
during write or erase operations.
Figure 18. AC Timing at Device Power-up
For the AC specifications t
VR
, t
R
, t
F
in the figure, refer to the next page. See the “ELECTRICAL SPECIFICATIONS“ described in
specifications for the supply voltage range, the operating temperature and the AC specifications not shown in the next page.
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