CY7C1049BN_09 Datasheet, PDF (1/10 Pages) Cypress Semiconductor – 512K x 8 Static RAM

1CY7C1049BN
Features
• High speed
— t_AA = 12 ns
• Low active power
— 1320 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
Logic Block Diagram
A₀
A₁
A₂
A₃
A₄
A₅
A₆
A₇
A₈
A₉
A₁₀
CE
WE
OE
INPUT BUFFER
512K x 8
ARRAY
COLUMN
DECODER
POWER
DOWN
CY7C1049BN
512K x 8 Static RAM
Functional Description^[1]
The CY7C1049BN is a high-performance CMOS static RAM
organized as 524,288 words by 8 bits. Easy memory
expansion 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 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
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 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 CY7C1049BN is available in a standard 400-mil-wide
36-pin SOJ package with center power and ground (revolu-
tionary) pinout.
Pin Configuration
SOJ
Top View
I/O₀
I/O₁
I/O₂
I/O₃
I/O₄
I/O₅
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
I/O₆
I/O₇
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document #: 001-06501 Rev. **
Revised February 2, 2006