STK20C04-W30 데이터 시트보기 (PDF) - Simtek Corporation
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STK20C04-W30 Datasheet PDF : 8 Pages
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NONVOLATILE MEMORY OPERATION
STK20C04
MODE SELECTION
E
W
G
NE
H
X
X
X
L
H
L
H
L
L
X
H
L
H
L
L
L
L
H
L
L
L
L
L
L
H
H
X
MODE
Not Selected
Read RAM
Write RAM
Nonvolatile RECALLn
Nonvolatile STORE
No operation
POWER
Standby
Active
Active
Active
ICC2
Active
STORE CYCLES #1 & #2
SYMBOLS
NO.
#1
#2
Alt.
PARAMETER
(VCC = 5.0V ± 10%)
MIN MAX UNITS
22 tWLQXp
23 tWLNHq
24
tGHNL
25
26
tNLWL
27
tELWL
tELQXS
tELNHS
tGHEL
tNLEL
tSTORE
tWC
STORE Cycle Time
STORE Initiation Cycle Time
Output Disable Set-up to NE Fall
Output Disable Set-up to E Fall
NE Set-up
Chip Enable Set-up
10
ms
45
ns
0
ns
0
ns
0
ns
0
ns
28
tWLEL
Write Enable Set-up
0
ns
Note: n: An automatic RECALL also takes place at power up, starting when VCC exceeds 3.8V, and taking tRECALL from the time at which VCC exceeds 4.5V.
VCC must not drop below 3.8V once it has exceeded it for the RECALL to function properly.
Note o: If E is low for any period of time in which W is high while G and NE are low, then a RECALL cycle may be initiated.
Note p: Measured with W and NE both returned high, and G returned low. Note that STORE cycles are inhibited/aborted by VCC < 3.8V (STORE inhibit).
Note q: Once tWC has been satisfied by NE, G, W and E, the STORE cycle is completed automatically. Any of NE, G, W or E may be used to terminate the
STORE initiation cycle.
STORE CYCLE #1: W CONTROLLEDo
NE
G
24
26
tGHNL
tNLWL
W
27
E
tELWL
DQ (Data Out)
HIGH IMPEDANCE
STORE CYCLE #2: E CONTROLLEDo
26
tNLEL
NE
25
tGHEL
G
28
W
tWLEL
E
DQ (Data Out)
HIGH IMPEDANCE
2-43
23
tWLNH
22
tWLQX
23
tELNHS
22
tELQXS
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