PRELIMINARY
CY62147V MoBL™
256K x 16 Static RAM
disabled (BHE, BLE HIGH), or during a write operation (CE
LOW, and WE LOW).
Features
• Low voltage range:
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 through I/O ), is
1.8V–3.6V
—
• Ultra low active, standby power
0
7
written into the location specified on the address pins (A
0
• Easy memory expansion with CE and OE features
• TTL-compatible inputs and outputs
• Automatic power-down when deselected
• CMOS for optimum speed/power
through A ). If Byte High Enable (BHE) is LOW, then data
17
from I/O pins (I/O through I/O ) is written into the location
8
15
specified on the address pins (A through A ).
0
17
Reading from the device 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
Functional Description
The CY62147V is a high-performance CMOS static RAM or-
ganized as 262,144 words by 16 bits. This device features ad-
vanced circuit design to provide ultra-low active current. This
is ideal for providing More Battery Life™ (MoBL™) in portable
applications such as cellular telephones. The device also has
an automatic power-down feature that significantly reduces
power consumption by 99% when addresses are not toggling.
The device can also be put into standby mode when deselec-
tected (CE HIGH) or when CE is LOW and both BLE and BHE
pins will appear on I/O to I/O . If Byte High Enable (BHE) is
0
7
LOW, then data from memory will appear on I/O to I/O . See
8
15
the truth table at the back of this data sheet for a complete
description of read and write modes.
The 62147V MoBL SRAM has an extremely wide operating
voltage range. The datasheet has been specified to accurately
describe the device behavior at three common voltage ranges
(3.6 – 2.7, 2.7 – 2.3, 2.3 – 1.8)
are HIGH. The input/output pins (I/O through I/O ) are
placed in a high impedance state when: deselected (CE
HIGH), outputs are disabled (OE HIGH), BHE and BLE are
0
15
The CY62147V is available in 48-ball FBGA and standard
44-pin TSOP Type II (forward pinout) packaging.
Logic Block Diagram
Pin
Configurations
TSOP II (Forward)
Top View
44
1
A
4
A
5
43
42
41
40
39
38
A
A
2
3
4
5
6
3
6
DATA IN DRIVERS
A
A
2
7
OE
A
1
A9
BHE
BLE
I/O
I/O
I/O
A
0
A8
A7
A6
A5
A4
A3
CE
I/O
7
0
15
37
36
35
34
33
I/O
I/O
8
1
2
14
13
12
256K x 16
9
10
11
12
13
I/O
V
SS
RAM Array
1024 X 4096
I/O
I/O0 – I/O7
I/O8 – I/O15
3
CC
V
SS
V
V
CC
A2
A1
A0
I/O
32
I/O
I/O
4
5
6
7
11
10
I/O
I/O
I/O
31
30
29
28
14
15
16
I/O
I/O
9
8
WE 17
NC
18
27
26
25
A
A
8
16
A
19
A
9
COLUMN DECODER
15
A
20
21
22
A
14
10
A
A
12
24
23
11
13
A
A
17
BHE
WE
CE
62147V–2
OE
BLE
CE
Power Down
Circuit
62147V–1
BHE
BLE
MoBL and More Battery Life are trademarks of Cypress Semiconductor Corporation.
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
July 16, 1999