CY7C1046B Datasheet, PDF (1/8 Pages) Cypress Semiconductor – 1M x 4 Static RAM

046B
CY7C1046B
1M x 4 Static RAM
Features
• High speed
— t_AA = 12 ns
• Low active power
— 935 mW (max.)
• Low CMOS standby power (L version)
— 2.75 mW (max.)
• 2.0V Data Retention (400 µW at 2.0V retention)
• Automatic power-down when deselected
• TTL-compatible inputs and outputs
• Easy memory expansion with CE and OE features
Functional Description
The CY7C1046B is a high-performance CMOS static RAM or-
ganized as 1,048,576 words by 4 bits. Easy memory expan-
Logic Block Diagram
sion is provided by an active LOW Chip Enable (CE), an active
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/O₀
through I/O₃) is then written into the location specified on the
address pins (A₀ through A₁₉).
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/O₀ through I/O₃) 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 (revolu-
tionary) pinout.
Pin Configuration
SOJ
Top View
A₀
A₁
A₂
A₃
A₄
A₅
A₆
A₇
A₈
A₉
A₁₀
CE
WE
OE
INPUT BUFFER
1M x 4
ARRAY
COLUMN
DECODER
POWER
DOWN
I/O₀
I/O₁
I/O₂
I/O₃
1046B–1
A₀ 1
A_{1 2}
A₂ 3
A₃ 4
A_{4 5}
CE 6
I/O₀ 7
V_CC 8
GND 9
I/O₁ 10
WE 11
A₅ 12
A₆ 13
A₇ 14
A_{8 15}
A_{9 16}
32 A₁₉
31 A₁₈
30 A₁₇
29 A₁₆
28 A₁₅
27 OE
26 I/O₃
25 _GND
24 _VCC
23 I/O₂
22 A₁₄
21 A₁₃
20 A₁₂
19 A₁₁
18 A₁₀
17 NC
1046B–2
Selection Guide
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum CMOS Standby
Current (mA)
Shaded areas contain advance information.
Com’l
L version
7C1046B-12
12
170
8
0.5
7C1046B-15
15
150
8
0.5
7C1046B-20
20
130
8
0.5
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-05144 Rev. **
Revised September 6, 2001