1041B
WCFS4016C1C
256K x 16 Static RAM
Features
• High speed
—
t
AA
= 15 ns
• 2.0V Data Retention (400
µW
at 2.0V retention)
• Automatic power-down when deselected
• TTL-compatible inputs and outputs
• Easy memory expansion with CE and OE features
from I/O pins (I/O
8
through I/O
15
) is written into the location
specified on the address pins (A
0
through A
17
).
Reading from the device is accomplished by taking Chip En-
able (CE) and Output Enable (OE) LOW while forcing the Write
Enable (WE) HIGH. If Byte Low Enable (BLE) is LOW, then
data from the memory location specified by the address pins
will appear on I/O
0
to I/O
7
. If Byte High Enable (BHE) is LOW,
then data from memory will appear on I/O
8
to I/O
15
. See the
truth table at the back of this data sheet for a complete descrip-
tion of read and write modes.
The input/output pins (I/O
0
through I/O
15
) are placed in a
high-impedance state when the device is deselected (CE
HIGH), the outputs are disabled (OE HIGH), the BHE and BLE
are disabled (BHE, BLE HIGH), or during a write operation (CE
LOW, and WE LOW).
The WCFS4016C1C is available in a standard 44-pin
400-mil-wide SOJ package.
Functional Description
The WCFS4016C1C is a high-performance CMOS static RAM
organized as 262,144 words by 16 bits.
Writing to the device is accomplished by taking Chip Enable
(CE) and Write Enable (WE) inputs LOW. If Byte Low Enable
(BLE) is LOW, then data from I/O pins (I/O
0
through I/O
7
), is
written into the location specified on the address pins (A
0
through A
17
). If Byte High Enable (BHE) is LOW, then data
Logic Block Diagram
INPUT BUFFER
Pin Configuration
SOJ
Top View
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
256K x 16
ARRAY
1024 x 4096
I/O
0
– I/O
7
I/O
8
– I/O
15
COLUMN
DECODER
BHE
WE
CE
OE
BLE
A
0
A
1
A
2
A
3
A
4
CE
I/O
0
I/O
1
I/O
2
I/O
3
V
CC
V
SS
I/O
4
I/O
5
I/O
6
I/O
7
WE
A
5
A
6
A
7
A
8
A
9
ROW DECODER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
A
17
A
16
A
15
OE
BHE
BLE
I/O
15
I/O
14
I/O
13
I/O
12
V
SS
V
CC
I/O
11
I/O
10
I/O
9
I/O
8
NC
A
14
A
13
A
12
A
11
A
10
Selection Guide
WCFS4016C1C 15ns
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum CMOS Standby Current (mA)
15
190
3
A
9
A
10
A
11
A
12
A
13
A
14
A
15
A
16
A
17
SENSE AMPS
Revised April 19, 2002
WEIDA [ WEIDA SEMICONDUCTOR, INC. ]
