CY7C1049D_11 Datasheet, PDF (1/12 Pages) Cypress Semiconductor – 4-Mbit (512 K × 8) Static RAM TTL-compatible inputs and outputs

CY7C1049D
4-Mbit (512 K × 8) Static RAM
Features
■ Pin- and function-compatible with CY7C1049B
■ High speed
❐ t_AA = 10 ns
■ Low active power
❐ I_CC = 90 mA at 10 ns
■ Low CMOS Standby power
❐ I_SB2 = 10 mA
■ 2.0 V data retention
■ Automatic power-down when deselected
■ TTL-compatible inputs and outputs
■ Easy memory expansion with CE and OE features
■ Available in Pb-free 36-Pin (400-Mil) Molded SOJ package
Logic Block Diagram
Functional Description^[1]
The CY7C1049D is a high-performance CMOS static RAM
organized as 512K words by 8 bits. Easy memory expansion
is provided by an active LOW Chip Enable (CE), an active
LOW Output Enable (OE), and tri-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 CY7C1049D is available in a standard 400-mil-wide
36-pin SOJ package with center power and ground (revolu-
tionary) pinout.
A₀
A₁
A₂
A₃
A₄
A₅
A₆
A₇
A₈
A₉
A₁₀
CE
WE
INPUT BUFFER
512K x 8
COLUMN
DECODER
POWER
DOWN
I/O₀
I/O₁
I/O₂
I/O₃
I/O₄
I/O₅
I/O₆
I/O₇
OE
Selection Guide
–10
Unit
Maximum access time
10
ns
Maximum operating current
90
mA
Maximum CMOS standby current
10
mA
Note
1. For guidelines on SRAM system design, refer to the ‘System Design Guidelines’ Cypress application note, available on the internet at www.cypress.com.
Cypress Semiconductor Corporation • 198 Champion Court
Document #: 38-05474 Rev. *E
• San Jose, CA 95134-1709 • 408-943-2600
Revised April 20, 2011
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