S4016V1C
WCFS4016V1C
256K x 16 Static RAM
Features
• High speed
— t
AA
= 12ns
• 2.0V Data 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 devices is accomplished by taking Chip
Enable (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
description 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 WCFS4016V1C is available in a standard 44-pin
400-mil-wide body width SOJ and 44-pin TSOP II package
with center power and ground pinout.
Functional Description
The WCFS4016V1C is high-performance CMOS Static RAMs
organized as 262K words by 16 bits.
Writing to the devices 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
TSOP II
Top View
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
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
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
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
ROW DECODER
Selection Guide
WCFS4016V1C 12ns
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum CMOS Standby Current (mA)
Comm’l
Comm’l
12
85
10
A
9
A
10
A
11
A
12
A
13
A
14
A
15
A
16
A
17
SENSE AMPS
April 12, 2002
WEIDA [ WEIDA SEMICONDUCTOR, INC. ]
