256K x 4 Static RAM
CY7C106B
CY7C1006B
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
Document #: 38-05037 Rev. **
Revised August 24, 2001
1CY7C1006B
Features
• High speed
—tAA = 12 ns
• CMOS for optimum speed/power
• Low active power
— 495 mW
• Low standby power
— 275 mW
• 2.0V data retention (optional)
— 100
µW
• Automatic power-down when deselected
• TTL-compatible inputs and outputs
Functional Description
The CY7C106B and CY7C1006B are high-performance
CMOS static RAMs organized as 262,144 words by 4 bits.
Easy memory expansion is provided by an active LOW Chip
Enable (CE), an active LOW Output Enable (OE), and
three-state drivers. These devices have an automatic pow-
er-down feature that reduces power consumption by more
than 65% when the devices are deselected.
Writing to the devices is accomplished by taking Chip Enable
(CE) and Write Enable (WE) inputs LOW. Data on the four I/O
pins (I/O0 through I/O3) is then written into the location speci-
fied on the address pins (A0 through A17).
Reading from the devices is accomplished by taking Chip En-
able (CE) and Output Enable (OE) LOW while forcing Write
Enable (WE) HIGH. Under these conditions, the contents of
the memory location specified by the address pins will appear
on the four I/O pins.
The four input/output pins (I/O0 through I/O3) are placed in a
high-impedance state when the devices are deselected (CE
HIGH), the outputs are disabled (OE HIGH), or during a write
operation (CE and WE LOW).
The CY7C106B is available in a standard 400-mil-wide SOJ;
the CY7C1006B is available in a standard 300-mil-wide SOJ.
Logic Block Diagram
Pin Configuration
C106B–1
C106B–2
512 x 512 x 4
ARRAY
A1
COLUMN
DECODER
POWER
DOWN
OE
INPUT BUFFER
1
2
3
4
5
6
7
8
9
10
11
14
15
16
20
19
18
17
21
24
23
22
Top View
SOJ
12
13
25
28
27
26
GND
A1
A2
A3
A4
A5
A6
A7
A8
A17
VCC
A16
A15
A14
A13
I/O3
I/O2
I/O1
I/O0
A9
A0
A10
CE
OE
NC
A12
A11
WE
WE
CE
I/O0
I/O1
I/O2
I/O3
A2
A3
A4
A6
A7
A8
A9
A5
Selection Guide
7C106B-12
7C1006B-12
7C106B-15
7C1006B-15
7C106B-20
7C1006B-20
7C106B-25
7C1006B-25
7C106B-35
Maximum Access Time (ns)
12
15
20
25
35
Maximum Operating
Current (mA)
90
80
75
70
60
Maximum Standby
Current (mA)
50
30
30
30
25
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