CY6264 Datasheet, PDF (1/8 Pages) Cypress Semiconductor – 8K x 8 Static RAM

1CY 626 4
PRELIMINARY
CY6264
Features
• 55, 70 ns access times
• CMOS for optimum speed/power
• Easy memory expansion with CE₁, CE₂, and OE fea-
tures
• TTL-compatible inputs and outputs
• Automatic power-down when deselected
Functional Description
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 (CE₁), an active HIGH
chip enable (CE₂), and active LOW output enable (OE) and
three-state drivers. Both devices have an automatic pow-
er-down feature (CE₁), reducing the power consumption by
8K x 8 Static RAM
over 70% when deselected. The CY6264 is packaged in a
450-mil (300-mil body) SOIC.
An active LOW write enable signal (WE) controls the writ-
ing/reading operation of the memory. When CE₁ and WE in-
puts are both LOW and CE₂ is HIGH, data on the eight data
input/output pins (I/O₀ through I/O₇) is written into the memory
location addressed by the address present on the address
pins (A₀ through A₁₂). Reading the device is accomplished by
selecting the device and enabling the outputs, CE₁ and OE
active LOW, CE₂ active HIGH, while WE remains inactive or
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 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.
Logic Block Diagram
Pin Configuration
A₁
A₂
A₃
A₄
A₅
A₆
A₇
A₈
CE₁
CE₂
WE
OE
INPUT BUFFER
256 x 32 x 8
ARRAY
POWER
COLUMN DECODER ^DOWN
I/O₀
I/O₁
I/O₂
I/O₃
I/O₄
I/O₅
I/O₆
I/O₇
CY6264-1
SOIC
Top View
NC ₁
A_{4 2}
A_{5 3}
A_{6 4}
A_{7 5}
A_{8 6}
A_{9 7}
A_{10 8}
A_{11 9}
A_{12 10}
I/O_{0 11}
I/O_{1 12}
I/O_{2 13}
GND ₁₄
28 ^VCC
27 ^WE
26 ^CE2
25 ^A3
24 ^A2
23 ^A1
22 ^OE
21 ^A0
20 ^CE1
19 ^I/O7
18 ^I/O6
17 ^I/O5
16 ^I/O4
15 ^I/O3
CY6264-2
Selection Guide
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum Standby Current (mA)
Shaded area contains advanced information.
CY6264-55
55
100
20/15
CY6264-70
70
100
20/15
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
October 1994 – Revised June 1996