STK20C04 Simtek Corporation, STK20C04 Datasheet - Page 4

• 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

September 2003
STK20C04
SRAM WRITE CYCLES #1 & #2
Note i:
Note j:
SRAM WRITE CYCLE #1: W Controlled
SRAM WRITE CYCLE #2: E Controlled
NO.
12
13
14
15
16
17
18
19
20
21
ADDRESS
DATA OUT
DATA OUT
ADDRESS
DATA IN
t
WLQZ
DATA IN
t
t
t
t
t
t
t
t
t
WLWH
DVWH
WHDX
AVWH
WHAX
WHQX
ELWH
AVWL
AVAV
If W is low when E goes low, the outputs remain in the high-impedance state.
E or W must be
#1
W
h, i
E
W
E
SYMBOLS
t
t
t
t
t
t
t
t
WLEH
ELEH
DVEH
EHDX
AVEH
EHAX
AVAV
AVEL
#2
V
IH
t
AVWL
t
AVEL
18
during address transitions. NE
18
t
t
t
t
t
Alt.
t
t
t
t
t
OW
WC
WP
CW
DW
AW
WR
WZ
DH
AS
PREVIOUS DATA
Write Cycle Time
Write Pulse Width
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
t
WLQZ
t
20
AVEH
17
t
AVWH
17
PARAMETER
t
WLWH
13
V
IH
t
ELWH
j
.
j
14
t
AVAV
t
12
AVAV
12
HIGH IMPEDANCE
t
4
ELEH
14
t
WLEH
13
HIGH IMPEDANCE
t
DVWH
15
Document Control # ML0001 rev 0.1
t
DVEH
15
DATA VALID
DATA VALID
STK20C04-25
MIN
25
20
20
10
20
0
0
0
5
MAX
10
t
WHDX
t
STK20C04-35
WHAX
16
MIN
19
35
25
25
12
25
0
0
0
5
t
t
EHDX
EHAX
16
19
(V
t
WHQX
21
MAX
13
CC
= 5.0V
STK20C04-45
MIN
45
30
30
15
30
0
0
0
5
MAX
15
10%)
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns