8K x 8 Static RAM
CY7C185
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
Document #: 38-05043 Rev. *A
Revised September 13, 2002
185
Features
• High speed
—15 ns
•Fast tDOE
• Low active power
— 715 mW
• Low standby power
— 220 mW
• CMOS for optimum speed/power
• Easy memory expansion with CE1, CE2, and OE features
• TTL-compatible inputs and outputs
• Automatic power-down when deselected
Functional Description[1]
The CY7C185 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. This device has an automatic power-down
feature (CE1 or CE2), reducing the power consumption by 70%
when deselected. The CY7C185 is in a standard 300-mil-wide
DIP, SOJ, or SOIC package.
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 are 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 Configurations
A1
A2
A3
A4
A5
A6
A7
A8
I/O0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
WE
CE2
A3
A2
A1
OE
A0
CE1
I/O7
I/O6
I/O5
I/O4
I/O3
NC
A4
A5
A6
A7
A8
A9
A10
A11
A12
I/O0
I/O1
I/O2
GND
256 x 32 x 8
ARRAY
INPUT BUFFER
COLUMN DECODER
POWER
DOWN
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
CE1
CE2
WE
OE
Top View
DIP/SOJ/SOIC
Selection Guide[2]
7C185-15
7C185-20
7C185-25
7C185-35
Maximum Access Time (ns)
15
20
25
35
Maximum Operating Current (mA)
130
110
100
100
Maximum Standby Current (mA)
40/15
20/15
20/15
20/15
Note:
1.
For guidelines on SRAM system design, please refer to the ‘System Design Guidelines’ Cypress application note, available on the internet at www.cypress.com.
2.
For military specifications, see the CY7C185A data sheet.
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