DATA VALID
Preliminary
STK14EC8
SRAM WRITE CYCLES #1 & #2
SYMBOLS
NO.
STK14EC8-15
STK14EC8-25
STK14EC8-45
PARAMETER
UNITS
#1
#2
Alt.
MIN
15
10
15
5
MAX
MIN
25
20
20
10
0
MAX
MIN
45
30
30
15
0
MAX
12
13
14
15
16
17
18
19
20
21
t
t
t
WC
Write Cycle Time
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
AVAV
AVAV
t
t
t
Write Pulse Width
WLWH
WLEH
WP
CW
DW
t
t
t
t
Chip Enable to End of Write
Data Set-up to End of Write
Data Hold after End of Write
Address Set-up to End of Write
Address Set-up to Start of Write
Address Hold after End of Write
Write Enable to Output Disable
Output Active after End of Write
ELWH
DVWH
WHDX
ELEH
DVEH
EHDX
t
t
t
t
t
0
DH
AW
t
t
t
10
0
20
0
30
0
AVWH
AVEH
t
t
t
AS
AVWL
AVEL
t
t
t
0
0
0
WHAX
EHAX
WR
e, g
t
t
7
10
15
WLQZ
WZ
t
t
3
3
3
WHQX
OW
Note g: If W is low when E goes low, the outputs remain in the high-impedance state.
Note h: E or W must be ≥ VIH during address transitions.
g,h
SRAM WRITE CYCLE #1: W Controlled
12
t
AVAV
ADDRESS
19
WHAX
14
ELWH
t
t
E
17
AVWH
t
18
AVWL
t
13
WLWH
t
W
DATA IN
15
DVWH
16
WHDX
t
t
20
WLQZ
t
21
WHQX
t
HIGH IMPEDANCE
DATA OUT
PREVIOUS DATA
g,h
SRAM WRITE CYCLE #2: E Controlled
12
AVAV
t
ADDRESS
18
AVEL
14
ELEH
19
t
t
t
EHAX
E
17
AVEH
t
13
WLEH
t
W
15
DVEH
16
EHDX
t
t
DATA IN
DATA VALID
HIGH IMPEDANCE
DATA OUT
Rev 1.0
Document Control #ML0060
April, 2007
6
Simtek Confidential
SIMTEK [ SIMTEK CORPORATION ]
