049
PRELIMINARY
CY7C1049
512K x 8 Static RAM
is provided by an active LOW chip enable (CE), an active LOW
output enable (OE), and three-state drivers. Writing to the de-
vice is accomplished by taking chip enable (CE) and write en-
able (WE) inputs LOW. Data on the eight I/O pins (I/O0 through
I/O7) is then written into the location specified on the address
pins (A0 through A18).
Features
• High speed
— tAA = 15 ns
• Low active power
— 1210 mW (max.)
Reading from the device is accomplished by taking chip en-
able (CE) and output enable (OE) LOW while forcing write en-
able (WE) HIGH. Under these conditions, the contents of the
memory location specified by the address pins will appear on
the I/O pins.
• Low CMOS standby power (Commercial L version)
— 2.75 mW (max.)
• 2.0V Data Retention (400 µW at 2.0V retention)
• Automatic power-down when deselected
• TTL-compatible inputs and outputs
• Easy memory expansion with CE and OE features
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 CY7C1049 is available in a standard 400-mil-wide 36-pin
SOJ package with center power and ground (revolutionary)
pinout.
The CY7C1049 is a high-performance CMOS static RAM or-
ganized as 524,288 words by 8 bits. Easy memory expansion
Logic Block Diagram
Pin Configuration
SOJ
Top View
A0
A1
36
35
34
33
32
1
2
3
4
5
6
7
8
9
NC
A18
A17
A16
A15
A2
A3
A4
CE
I/O0
I/O1
VCC
31
30
29
28
OE
I/O7
I/O6
I/O
0
GND
VCC
I/O5
I/O4
A14
A13
A12
A11
A10
NC
INPUT BUFFER
27
26
25
GND 10
A
1
0
I/O
I/O
I/O2
I/O3
WE
11
12
13
1
A
A
2
24
23
22
21
20
19
2
A
A5
A6
A7
A8
A9
3
4
14
15
16
17
18
A
A
6
5
I/O
I/O
I/O
3
4
5
512K x 8
ARRAY
A
A
7
A
8
A
9
1049–2
A
10
I/O
6
7
POWER
DOWN
COLUMN
DECODER
CE
I/O
WE
1049–1
OE
Selection Guide
7C1049-12
7C1049-15
7C1049-17
7C1049-20
7C1049-25
Maximum Access Time (ns)
12
240
8
15
220
8
17
195
8
20
185
8
25
180
8
Maximum Operating Current (mA)
Maximum CMOS Standby
Current (mA)
Com’l
Com’l
Ind’l
L
0.5
9
0.5
9
0.5
9
0.5
9
0.5
9
Military
10
10
Shaded areas contain advance information.
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
Document #: 38-05063 Rev. **
Revised August 31, 2001