CY7C1049 Datasheet, PDF (1/10 Pages) Cypress Semiconductor – 512K x 8 Static RAM

049
PRELIMINARY
CY7C1049
512K x 8 Static RAM
Features
• High speed
— t_AA = 15 ns
• Low active power
— 1210 mW (max.)
• Low CMOS standby power (Commercial 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 CY7C1049 is a high-performance CMOS static RAM or-
ganized as 524,288 words by 8 bits. Easy memory expansion
Logic Block Diagram
is provided by an active LOW chip enable (CE), an active LOW
output enable (OE), and three-state drivers. Writing to the de-
vice is accomplished by taking chip enable (CE) and write en-
able (WE) inputs LOW. Data on the eight I/O pins (I/O₀ through
I/O₇) is then written into the location specified on the address
pins (A₀ through A₁₈).
Reading from the device is accomplished by taking chip en-
able (CE) and output enable (OE) LOW while forcing write en-
able (WE) HIGH. Under these conditions, the contents of the
memory location specified by the address pins will appear on
the I/O pins.
The eight input/output pins (I/O₀ through I/O₇) 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 CY7C1049 is available in a standard 400-mil-wide 36-pin
SOJ package with center power and ground (revolutionary)
pinout.
Pin Configuration
SOJ
Top View
INPUT BUFFER
A₀
A₁
A₂
A₃
A₄
A₅
A₆
A₇
512K x 8
ARRAY
A₈
A₉
A₁₀
CE
COLUMN
DECODER
WE
OE
Selection Guide
POWER
DOWN
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum CMOS Standby
Current (mA)
Com’l
Com’l L
Ind’l
Military
Shaded areas contain advance information.
I/O₀
I/O₁
I/O₂
I/O₃
I/O₄
I/O₅
I/O₆
I/O₇
1049–1
A₀ 1
A_{1 2}
A₂ 3
A₃ 4
A_{4 5}
CE 6
I/O₀ 7
I/O₁ 8
V_CC 9
GND 10
I/O₂ 11
I/O3 12
WE 13
A₅ 14
A₆ 15
A₇ 16
A_{8 17}
A_{9 18}
36 NC
35 A₁₈
34 A₁₇
33 A₁₆
32 A₁₅
31 OE
30 I/O₇
29 I/O₆
28 _GND
27 _VCC
26 I/O₅
25 I/O₄
24 A₁₄
23 A₁₃
22 A₁₂
21 A₁₁
20 A₁₀
19 NC
1049–2
7C1049-12
12
240
8
0.5
9
7C1049-15
15
220
8
0.5
9
7C1049-17
17
195
8
0.5
9
7C1049-20
20
185
8
0.5
9
10
7C1049-25
25
180
8
0.5
9
10
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-05063 Rev. **
Revised August 31, 2001