1CY62148
CY62148
512K x 8 Static RAM
an automatic power-down feature that reduces power con-
sumption by more than 99% when deselected.
Features
• 4.5V − 5.5V operation
• CMOS for optimum speed/power
• Low active power
Writing to the device is accomplished by taking Chip Enable
(CE) and Write Enable (WE) inputs LOW. Data on the eight I/O
pins (I/O0 through I/O7) is then written into the location speci-
fied on the address pins (A0 through A18).
— 660 mW (max.)
Reading from the device is accomplished by taking Chip En-
able (CE) and Output Enable (OE) LOW while forcing Write
Enable (WE) HIGH for read. Under these conditions, the con-
tents of the memory location specified by the address pins will
appear on the I/O pins.
• Low standby power (L version)
— 2.75 mW (max.)
• Automatic power-down when deselected
• TTL-compatible inputs and outputs
• Easy memory expansion with CE and OE options
The eight input/output pins (I/O0 through I/O7) are placed in a
high-impedance state when the device is deselected (CE
HIGH), the outputs are disabled (OE HIGH), or during a write
operation (CE LOW, and WE LOW).
Functional Description
The CY62148 is a high-performance CMOS static RAM orga-
nized as 524,288 words by 8 bits. Easy memory expansion is
provided by an active LOW Chip Enable (CE), an active LOW
Output Enable (OE), and three-state drivers. This device has
The CY62148 is available in a standard 32 pin 450-mil-wide
body width SOIC and 32 pin TSOP II packages.
Logic Block Diagram
Pin
Configuration
Top View
SOIC
TSOP II
A
VCC
32
31
30
1
17
A
16
A
14
A
12
A
15
2
3
4
A
18
29
28
WE
A
13
5
I/O
A
7
0
27
26
INPUT BUFFER
A
A
5
6
A
8
6
A
9
7
8
9
10
11
12
13
I/O
I/O
1
A
0
25
24
23
22
21
A
A
11
4
A
A
3
1
4
OE
A
2
A
A
2
10
A
A
1
5
6
CE
I/O
A
A
7
I/O
I/O
I/O
0
3
4
5
512 x 256 x 8
ARRAY
A
7
I/O
0
I/O
1
I/O
2
I/O
6
20
19
A
12
I/O
5
4
3
14
15
16
A
14
I/O
I/O
18
17
A
16
GND
A
17
I/O
6
7
POWER
DOWN
COLUMN
DECODER
CE
I/O
WE
62148-1
OE
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
March 14, 2001