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CY62148L-70SC Datasheet

  • CY62148L-70SC

  • IC-SM-4M CMOS SRAM

  • 223.33KB

  • 9頁

  • ETC

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PRELIMINARY
CY62148
512K x 8 Static RAM
Features
鈥?4.5V鈭?.5V operation
鈥?CMOS for optimum speed/power
鈥?Low active power
鈥?660 mW (max.)
鈥?Low standby power (Commercial L version)
鈥?2.75 mW (max.)
鈥?Automatic power-down when deselected
鈥?TTL-compatible inputs and outputs
鈥?Easy memory expansion with CE and OE options
an automatic power-down feature that reduces power con-
sumption by more than 99% when deselected.
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/O
0
through I/O
7
) is then written into the location speci-
fied on the address pins (A
0
through A
18
).
Reading from the device is accomplished by taking chip en-
able (CE) and output enable (OE) LOW while forcing write en-
able (WE) HIGH for read. Under these conditions, the contents
of the memory location specified by the address pins will ap-
pear 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
HIGH), the outputs are disabled (OE HIGH), or during a write
operation (CE LOW, and WE LOW).
The CY62148 is available in a standard 32 pin 450-mil-wide
body width SOIC and 32 pin TSOP II packages.
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
Logic Block Diagram
Pin Configuration
Top View
SOIC
TSOPII
A
17
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
A
18
WE
A
13
A
8
A
9
A
11
OE
A
10
CE
I/O
7
I/O
6
I/O
5
I/O
4
I/O
3
62148-2
I/O
0
INPUT BUFFER
A
0
A
1
A
4
A
5
A
6
A
7
A
12
A
14
A
16
A
17
I/O
1
ROW DECODER
I/O
2
SENSE AMPS
512K x 8
ARRAY
I/O
3
I/O
4
I/O
5
CE
WE
COLUMN
DECODER
POWER
DOWN
I/O
6
I/O
7
A
2
A
3
A
15
A
18
A
13
A
8
A
9
A
11
A
10
OE
62148-1
Cypress Semiconductor Corporation
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134
鈥?/div>
408-943-2600
June 30, 1998

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