STK20C04 Simtek Corporation, STK20C04 Datasheet - Page 5

• Manufacturer Part Number: STK20C04
• Description: Density = 4K ;; Format = 512 X 8 ;; # of Pins = 28 ;; Access Time (ns MAX) = 25,35,45 ;; Initiated Store = Hardware ;; Production = Now ;; Volt = 5 ;; Temps Commercial Industrial Military = C/i
• Manufacturer: Simtek Corporation

MODE SELECTION
Note k: An automatic RECALL takes place at power up, starting when V
STORE CYCLES #1 & #2
Note l:
Note m: Once t
Note n: 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.
STORE CYCLE #1: W Controlled
DQ (DATA OUT)
STORE CYCLE #2: E Controlled
DQ (DATA OUT)
September 2003
NO.
22
23
24
25
26
27
28
H
E
L
L
L
L
L
L
Measured with W and NE both returned high, and G returned low. STORE cycles are inhibited below 4.0V.
the STORE initiation cycle.
t
t
t
t
t
WLQX
WLNH
GHNL
NLWL
ELWL
NE
NE
W
W
G
G
E
E
#1
l
m
WC
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
SYMBOLS
W
X
H
H
H
t
t
t
t
t
L
L
L
ELQX
ELNH
GHEL
NLEL
WLEL
#2
HIGH IMPEDANCE
t
GHNL
24
t
t
t
t
HIGH IMPEDANCE
STORE
WC
ELWL
GHEL
27
25
Alt.
G
X
X
H
H
L
L
L
t
WLEL
28
t
NLEL
26
t
NLWL
26
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
Write Enable Set-up
n
n
NE
H
H
X
L
L
L
X
CC
5
exceeds 4.25V and taking t
PARAMETER
t
t
ELNH
WLNH
23
23
Document Control # ML0001 rev 0.1
Nonvolatile RECALL
Nonvolatile STORE
No Operation
Not Selected
Read SRAM
Write SRAM
MODE
t
ELQX
t
WLQX
22
22
RESTORE
k
.
(V
CC
MIN
20
0
0
0
0
0
= 5.0V
STK20C04
MAX
POWER
10
Standby
Active
Active
Active
Active
I
CC 2
10%)
UNITS
ms
ns
ns
ns
ns
ns
ns