鈥?/div>
鈥?CY62146V: 2.7V鈥?.6V
Ultra-low active, standby power
Easy memory expansion with CE and OE features
TTL-compatible inputs and outputs
Automatic power-down when deselected
CMOS for optimum speed/power
put/output pins (I/O
0
through I/O
15
) are placed in a high-im-
pedance state when: deselected (CE HIGH), outputs are dis-
abled (OE HIGH), BHE and BLE are disabled (BHE, BLE
HIGH), or during a write operation (CE LOW, and WE LOW).
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
16
). If Byte High Enable (BHE) is LOW, then data
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 CY62146V and CY62146V18 are available in 48-Ball
FBGA and standard 44-Pin TSOP Type II (forward pinout)
packaging.
Functional Description
The CY62146V and CY62146V18 are high-performance
CMOS static RAMs organized as 262,144 words by 16 bits.
These devices feature advanced circuit design to provide ul-
tra-low active current. This is ideal for providing More Battery
Life鈩?(MoBL鈩? in portable applications such as cellular tele-
phones. The device also has an automatic power-down fea-
ture that significantly reduces power consumption by 99%
when addresses are not toggling. The device can also be put
into standby mode when deselected (CE HIGH). The in-
Logic Block Diagram
Pin Configurations
TSOP II (Forward)
Top View
A
4
A
3
A
2
A
1
A
0
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
16
A
15
A
14
A
13
A
12
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
DATA IN DRIVERS
A
9
A
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
256K x 16
RAM Array
2048 x 2048
I/O
0
鈥揑/O
7
I/O
8
鈥揑/O
15
COLUMN DECODER
BHE
WE
CE
OE
BLE
62146V鈥?
A
5
A
6
A
7
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
8
A
9
A
10
A
11
A
17
62146V鈥?
ROW DECODER
MoBL, MoBL2, and More Battery Life are trademarks of Cypress Semiconductor Corporation.
Cypress Semiconductor Corporation
A
10
A
11
A
12
A
13
A
14
A
15
A
16
A
17
鈥?/div>
SENSE AMPS
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134
鈥?/div>
408-943-2600
March 23, 2000
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