1CY7C1046B
CY7C1046B
1M x 4 Static RAM
Features
鈥?High speed
鈥?t
AA
= 12 ns
鈥?Low active power
鈥?935 mW (max.)
鈥?Low CMOS standby power (L version)
鈥?2.75 mW (max.)
鈥?2.0V Data Retention (400
碌W
at 2.0V retention)
鈥?Automatic power-down when deselected
鈥?TTL-compatible inputs and outputs
鈥?Easy memory expansion with CE and OE features
LOW Output Enable (OE), and three-state drivers. Writing to
the device is accomplished by taking Chip Enable (CE) and
Write Enable (WE) inputs LOW. Data on the four I/O pins (I/O
0
through I/O
3
) is then written into the location specified on the
address pins (A
0
through A
19
).
Reading from the device is accomplished by taking Chip
Enable (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 I/O pins.
The four input/output pins (I/O
0
through I/O
3
) are placed in a
high-impedance state when the device is deselected (CE
HIGH), the outputs are disabled (OE HIGH), or during a write
operation (CE LOW, and WE LOW).
The CY7C1046B is available in a standard 400-mil-wide
32-pin SOJ package with center power and ground (revolution-
ary) pinout.
Functional Description
The CY7C1046B is a high-performance CMOS static RAM or-
ganized as 1,048,576 words by 4 bits. Easy memory expan-
sion is provided by an active LOW Chip Enable (CE), an active
Logic Block Diagram
Pin Configuration
SOJ
Top View
A
0
A
1
A
2
A
3
A
4
CE
I/O
0
V
CC
GND
I/O
1
WE
A
5
A
6
A
7
A
8
A
9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
A
19
A
18
A
17
A
16
A
15
OE
I/O
3
GND
V
CC
I/O
2
A
14
A
13
A
12
A
11
A
10
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
A
10
INPUT BUFFER
ROW DECODER
I/O
0
SENSE AMPS
1M x 4
ARRAY
I/O
1
I/O
2
I/O
3
1046B鈥?
CE
WE
COLUMN
DECODER
POWER
DOWN
A
11
A
12
A
13
A
14
A
15
A
16
A
17
A
18
A
19
OE
1046B鈥?
Selection Guide
7C1046B-12
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum CMOS Standby
Current (mA)
Shaded areas contain advance information.
7C1046B-15
15
150
8
0.5
7C1046B-20
20
130
8
0.5
12
170
Com鈥檒
L version
8
0.5
Cypress Semiconductor Corporation
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134
鈥?/div>
408-943-2600
May 24, 2001
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