1CY6264
PRELIMINARY
CY6264
8K x 8 Static RAM
over 70% when deselected. The CY6264 is packaged in a
450-mil (300-mil body) SOIC.
Features
• 55, 70 ns access times
• CMOS for optimum speed/power
An active LOW write enable signal (WE) controls the writ-
ing/reading operation of the memory. When CE and WE in-
1
• Easy memory expansion with CE , CE , and OE fea-
puts are both LOW and CE is HIGH, data on the eight data
1
2
2
tures
input/output pins (I/O through I/O ) is written into the memory
0
7
location addressed by the address present on the address
pins (A through A ). Reading the device is accomplished by
• TTL-compatible inputs and outputs
• Automatic power-down when deselected
0
12
selecting the device and enabling the outputs, CE and OE
1
active LOW, CE active HIGH, while WE remains inactive or
Functional Description
2
HIGH. Under these conditions, the contents of the location ad-
dressed by the information on address pins is present on the
eight data input/output pins.
The CY6264 is a high-performance CMOS static RAM orga-
nized as 8192 words by 8 bits. Easy memory expansion is
provided by an active LOW chip enable (CE ), an active HIGH
1
The input/output pins remain in a high-impedance state unless
the chip is selected, outputs are enabled, and write enable
(WE) is HIGH. A die coat is used to insure alpha immunity.
chip enable (CE ), and active LOW output enable (OE) and
2
three-state drivers. Both devices have an automatic pow-
er-down feature (CE ), reducing the power consumption by
1
Logic Block Diagram
Pin Configuration
SOIC
Top View
NC
V
CC
1
2
3
4
28
27
26
25
24
23
22
21
20
19
18
17
16
15
A
WE
CE
4
A
5
2
A
A
3
6
I/O
0
A
A
2
A
1
7
5
6
7
8
INPUT BUFFER
A
8
I/O
1
A
9
OE
A
A
A
A
0
10
11
12
CE
1
9
A
1
I/O
2
I/O
I/O
I/O
I/O
I/O
7
6
5
4
3
10
11
12
13
14
A
2
I/O
I/O
I/O
0
1
2
A
I/O
3
3
A
256 x 32 x 8
ARRAY
4
GND
A
5
I/O
4
A
6
CY6264-2
A
A
8
7
I/O
5
I/O
6
POWER
DOWN
CE
1
I/O
7
COLUMN DECODER
CE
2
WE
OE
CY6264-1
Selection Guide
CY6264-55
CY6264-70
Maximum Access Time (ns)
55
70
Maximum Operating Current (mA)
100
100
Maximum Standby Current (mA)
20/15
20/15
Shaded area contains advanced information.
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
October 1994 – Revised June 1996
•
408-943-2600