S1008C3E
1008C9E
WCFS1008C3E
WCFS1008C9E
128K x 8 Static RAM
Features
• High speed
— t
AA
= 15 ns
• 2.0V Data Retention
• Automatic power-down when deselected
• TTL-compatible inputs and outputs
• Easy memory expansion with CE
1
, CE
2
, and OE options
Two (CE
2
) input HIGH. Data on the eight I/O pins (I/O
0
through
I/O
7
) is then written into the location specified on the address
pins (A
0
through A
16
).
Reading from the device is accomplished by taking Chip En-
able One (CE
1
) and Output Enable (OE) LOW while forcing
Write Enable (WE) and Chip Enable Two (CE
2
) HIGH. Under
these conditions, the contents of the memory location speci-
fied by the address pins will appear on the I/O pins.
The eight input/output pins (I/O
0
through I/O
7
) are placed in a
high-impedance state when the device is deselected (CE
1
HIGH or CE
2
LOW), the outputs are disabled (OE HIGH), or
during a write operation (CE
1
LOW, CE
2
HIGH, and WE LOW).
The WCFS1008C3E is available in standard 300-mil-wide
SOJ. The WCFS1008C9E is available in standard 400-mil-
wide SOJ. The WCFS1008C3E and WCFS1008C9E are func-
tionally equivalent in all other respects.
.
Functional Description
The WCF1008C3E and WCFS1008C9E are high-perfor-
mance CMOS static RAM organized as 131,072 words by 8
bits. Easy memory expansion is provided by an active LOW
Chip Enable (CE
1
), an active HIGH Chip Enable (CE
2
), an
active LOW Output Enable (OE), and three-state drivers. Writ-
ing to the device is accomplished by taking Chip Enable One
(CE
1
) and Write Enable (WE) inputs LOW and Chip Enable
Logic Block Diagram
Pin
Configurations
SOJ
I/O
0
INPUT BUFFER
Top View
NC
A
16
A
14
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
I/O
0
I/O
1
I/O
2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
V
CC
A
15
CE
2
WE
A
13
A
8
A
9
A
11
OE
A
10
CE
1
I/O
7
I/O
6
I/O
5
I/O
4
I/O
3
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
I/O
1
ROW DECODER
I/O
2
SENSE AMPS
512 x 256 x 8
ARRAY
I/O
3
I/O
4
I/O
5
CE
1
CE
2
WE
OE
COLUMN
DECODER
POWER
DOWN
I/O
6
I/O
7
Selection Guide
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum CMOS Standby Current (mA)
WCFS1008C3E WCFS1008C9E 15ns
15
80
10
A
9
A
10
A
11
A
12
A
13
A
14
A
15
A
16
Revised April 12, 2002
WEIDA [ WEIDA SEMICONDUCTOR, INC. ]
