64K x 4 Static RAM
CY7C194
CY7C195
CY7C196
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
Document #: 38-05162 Rev. **
Revised September 18, 2001
96
Features
• High speed
—12 ns
• Output enable (OE) feature (7C195 and 7C196)
• CMOS for optimum speed/power
• Low active power
— 880 mW
• Low standby power
— 220 mW
• TTL-compatible inputs and outputs
• Automatic power-down when deselected
Functional Description
The CY7C194, CY7C195, and CY7C196 are high-perfor-
mance CMOS static RAMs organized as 65,536 by 4 bits.
Easy memory expansion is provided by active LOW Chip En-
able(s) (CE on the CY7C194 and CY7C195, CE1, CE2 on the
CY7C196) and three-state drivers. They have an automatic
power-down feature, reducing the power consumption by 75%
when deselected.
Writing to the device is accomplished when the Chip Enable(s)
(CE on the CY7C194 and CY7C195, CE1, CE2 on the
CY7C196) and Write Enable (WE) inputs are both LOW. Data
on the four input pins (I/O0 through I/O3) is written into the
memory location, specified on the address pins (A0 through
A15).
Reading the device is accomplished by taking the Chip En-
able(s) (CE on the CY7C194 and CY7C195, CE1, CE2 on the
CY7C196) LOW, while Write Enable (WE) remains HIGH. Un-
der these conditions the contents of the memory location
specified on the address pins will appear on the four data I/O
pins.
A die coat is used to ensure alpha immunity.
CE
Logic Block Diagram
Pin Configurations
1024 x 64 x 4
ARRAY
A1
A2
A3
A4
A5
A6
A7
A8
COLUMN
DECODER
POWER
DOWN
WE
(OE)
(7C195 and
7C196 ONLY)
I/O3
CE2 (7C196 only)
I/O2
I/O1
I/O0
1
2
3
4
5
6
7
8
9
10
11
14
15
16
20
19
18
17
21
24
23
22
Top View
DIP/SOJ
7C194
A5
A6
A7
A8
A9
A10
A11
A12
A13
WE
VCC
A4
A3
A2
A1
I/O3
I/O2
I/O1
I/O0
A0
GND
12
13
1
2
3
4
5
6
7
8
9
10
11
14
15
16
20
19
18
17
21
24
23
22
Top View
DIP/SOJ
7C195
12
13
25
28
27
26
GND
A6
A7
A8
A9
A10
A11
A12
A13
WE
VCC
A4
A3
A2
A1
I/O3
I/O2
I/O1
I/O0
A0
CE1
A14
A15
A5
A14
A15
OE
NC
NC
CE2
(7C196)
INPUT BUFFER
CE1
A9
A10
7C196
C194-1
C194-2
C194-3
NC
(7C195)
Selection Guide
7C194-12
7C195-12
7C196-12
7C194-15
7C195-15
7C196-15
7C194-20
7C195-20
7C196-20
7C194-25
7C195-25
7C196-25
7C194-35
7C195-35
7C196-35
7C194-45
7C196-45
Maximum Access Time (ns)
12
15
20
25
35
45
Maximum Operating Current (mA)
155
145
135
115
115
Maximum Standby Current (mA)
30
30
30
30
30
30
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